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  • DataGridView Check Box selection

    - by adopilot
    I added datagridview to my win forms app and I also added one Check Box for marking rows. ChekBox work as I accepted until user do sorting of DataGridView, After that previous selection of checkbox column get lost. Is there a way to I make my datagridview remember which row is selected and after user do a sorting.

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  • Add Imagebutton to DataGridView in C#

    - by espais
    I am trying to do a simple 'Delete Row' button in a DataGridView that I have, but the problem is that I would like it to be an ImageButton rather than a simple Button. Currently I have it setup to be a ButtonColumn, but have seen no possibility for changing it from a simple button with text to a button with an image on it. I know this is possible and hopefully relatively simple, but am unsure of how to go about doing it.

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  • PIVOT / UNPIVOT IN SQL 2008

    - by Nev_Rahd
    Hello I got child / parent tables as below. MasterTable: MasterID, Description ChildTable ChildID, MasterID, Description. Using PIVOT / UNPIVOT how can i get result as below in single row. if (MasterID : 1 got x child records) MasterID, ChildID1, Description1, ChildID2, Description2....... ChildIDx, Descriptionx Thanks

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  • WPF - ListBox ignores Style When ItemsSource is bound

    - by Andy T
    Hi, I have created styled a ListBox in WPF so that it is rendered as a checkbox list. When I populate the ListBox's items manually, the styling works perfectly. However, when I instead bind the ItemsSource of the ListBox to a static resource (an ItemsControl containing the required items), the styling is completely dropped. Here's the style: <Style x:Key="CheckBoxListStyle" TargetType="ListBox"> <Style.Resources> <Style TargetType="ListBoxItem"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="ListBoxItem"> <Grid Margin="2"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <CheckBox IsChecked="{Binding IsSelected, RelativeSource={RelativeSource TemplatedParent}, Mode=TwoWay}"/> <ContentPresenter Grid.Column="1" Margin="2,0,0,0" /> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </Style.Resources> <Setter Property="ItemsPanel"> <Setter.Value> <ItemsPanelTemplate> <WrapPanel Orientation="Vertical" /> </ItemsPanelTemplate> </Setter.Value> </Setter> <Setter Property="BorderThickness" Value="0" /> <Setter Property="Background" Value="Transparent" /> </Style> Here's the code for the ListBox that shows the style correctly: <ListBox x:Name="ColumnsList" Grid.Column="0" Grid.Row="0" Style="{StaticResource CheckBoxListStyle}" BorderThickness="1"> <ListBox.Items> <ListBoxItem>Test</ListBoxItem> <ListBoxItem>Test2</ListBoxItem> <ListBoxItem>Test3</ListBoxItem> </ListBox.Items> </ListBox> Here's the code for the ListBox that ignores the style: <ListBox x:Name="ColumnsList2" Grid.Column="0" Grid.Row="0" Style="{StaticResource CheckBoxListStyle}" BorderThickness="1" ItemsSource="{Binding Source={StaticResource Test1}, Path=Items}"> </ListBox> Hoping someone can help - I'm pretty new to all this and have tried everything I can think of, but everything I've read leads me to believe that setting ItemsSource should have the same outcome as setting the items manually, so I can't see any reason why this would not work. Thanks, AT

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  • Compile Assembly Output generated by VC++?

    - by SDD
    I have a simple hello world C program and compile it with /FA. As a consequence, the compiler also generates the corresponding assembly listing. Now I want to use masm/link to assemble an executable from the generated .asm listing. The following command line yields 3 linker errors: \masm32\bin\ml /I"C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include" /c /coff asm_test.asm \masm32\bin\link /SUBSYSTEM:CONSOLE /LIBPATH:"C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\lib" asm_test.obj indicating that the C-runtime functions were not linked to the object files produced earlier: asm_test.obj : error LNK2001: unresolved external symbol @__security_check_cookie@4 asm_test.obj : error LNK2001: unresolved external symbol _printf LINK : error LNK2001: unresolved external symbol _wmainCRTStartup asm_test.exe : fatal error LNK1120: 3 unresolved externals Here is the generated assembly listing ; Listing generated by Microsoft (R) Optimizing Compiler Version 15.00.30729.01 TITLE c:\asm_test\asm_test\asm_test.cpp .686P .XMM include listing.inc .model flat INCLUDELIB OLDNAMES PUBLIC ??_C@_0O@OBPALAEI@hello?5world?$CB?6?$AA@ ; `string' EXTRN @__security_check_cookie@4:PROC EXTRN _printf:PROC ; COMDAT ??_C@_0O@OBPALAEI@hello?5world?$CB?6?$AA@ CONST SEGMENT ??_C@_0O@OBPALAEI@hello?5world?$CB?6?$AA@ DB 'hello world!', 0aH, 00H ; `string' CONST ENDS PUBLIC _wmain ; Function compile flags: /Ogtpy ; COMDAT _wmain _TEXT SEGMENT _argc$ = 8 ; size = 4 _argv$ = 12 ; size = 4 _wmain PROC ; COMDAT ; File c:\users\octon\desktop\asm_test\asm_test\asm_test.cpp ; Line 21 push OFFSET ??_C@_0O@OBPALAEI@hello?5world?$CB?6?$AA@ call _printf add esp, 4 ; Line 22 xor eax, eax ; Line 23 ret 0 _wmain ENDP _TEXT ENDS END I am using the latest masm32 version (6.14.8444).

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  • Can't get recursive function to work in Java

    - by Ahmed Salah
    I read docs about java recorsion and I thought I have understood it, but when I try to use it in the following example, it does not work as expected. I a class account, which has amount and can have forther subAccount. I would have implemented one method getSum, which has to return the summ of the amount of the account and amount of all of its subaccount. In the following code, the call of the method getSumm() should return 550, but it behaves strange. can somebody help please? public class Balance{ ArrayList<Balance> subAccounts = new ArrayList<Balance>(); String accountID = null; Double amount = null; double result=0; public double getSum(ArrayList<Balance> subAccounts){ if(subAccounts !=null && subAccounts.size()>0){ for (int i = 0; i < subAccounts.size(); i++) { result = result + getSum(subAccounts.get(i).subAccounts); } } else { return amount; } return result; } public static void main(String[] args) { Balance bs1 = new Balance(); Balance bs2 = new Balance(); Balance bs3 = new Balance(); bs1.amount=100.0; bs2.amount=150.0; bs3.amount=300.0; ArrayList<Balance> subAccounts1 = new ArrayList<Balance>(); bs2.subAccounts=null; bs3.subAccounts=null; subAccounts1.add(bs2); subAccounts1.add(bs3); bs1.subAccounts=subAccounts1; double sum= bs1.getSum(subAccounts1); System.out.println(sum); } }

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  • Loading Facebook fb:profile-pic via AJAX in Facebook Connect site

    - by mbrevoort
    After a page loads, I'm making an AJAX request to pull down an HTML chunk that contains tags representing a Facebook user profile picture. I append the result to a point in the DOM but the logos don't load, instead all I see is the default silhouette. Here's simply how I'm loading the HTML chunk with jQuery $.ajax({ url: "/facebookprofiles" success: function(result) { $('#profiles').append(result); } }); The HTML that I'm appending is a list of diffs like this: <div class="status Accepted"> <fb:profile-pic class="image" facebook-logo="true" linked="true" size="square" uid="1796055648"></fb:profile-pic> <p> <strong>Corona Kingsly</strong>My Status Update<br/> <span style="font-size: 0.8em">52 minutes ago</span> </p> </div> Any ideas? I assume the fb tags are not being processed once the dom is loaded. Is there any way to make that happen? I'm not seeing any exceptions or errors in my Firebug console. Thanks

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  • c#: Clean way to fit a collection into a multidimensional array?

    - by Rosarch
    I have an ICollection<MapNode>. Each MapNode has a Position attribute, which is a Point. I want to sort these points first by Y value, then by X value, and put them in a multidimensional array (MapNode[,]). The collection would look something like this: (30, 20) (20, 20) (20, 30) (30, 10) (30, 30) (20, 10) And the final product: (20, 10) (20, 20) (20, 30) (30, 10) (30, 20) (30, 30) Here is the code I have come up with to do it. Is this hideously unreadable? I feel like it's more hacky than it needs to be. private Map createWorldPathNodes() { ICollection<MapNode> points = new HashSet<MapNode>(); Rectangle worldBounds = WorldQueryUtils.WorldBounds(); for (float x = worldBounds.Left; x < worldBounds.Right; x += PATH_NODE_CHUNK_SIZE) { for (float y = worldBounds.Y; y > worldBounds.Height; y -= PATH_NODE_CHUNK_SIZE) { // default is that everywhere is navigable; // a different function is responsible for determining the real value points.Add(new MapNode(true, new Point((int)x, (int)y))); } } int distinctXValues = points.Select(node => node.Position.X).Distinct().Count(); int distinctYValues = points.Select(node => node.Position.Y).Distinct().Count(); IList<MapNode[]> mapNodeRowsToAdd = new List<MapNode[]>(); while (points.Count > 0) // every iteration will take a row out of points { // get all the nodes with the greatest Y value currently in the collection int currentMaxY = points.Select(node => node.Position.Y).Max(); ICollection<MapNode> ythRow = points.Where(node => node.Position.Y == currentMaxY).ToList(); // remove these nodes from the pool we're picking from points = points.Where(node => ! ythRow.Contains(node)).ToList(); // ToList() is just so it is still a collection // put the nodes with max y value in the array, sorting by X value mapNodeRowsToAdd.Add(ythRow.OrderByDescending(node => node.Position.X).ToArray()); } MapNode[,] mapNodes = new MapNode[distinctXValues, distinctYValues]; int xValuesAdded = 0; int yValuesAdded = 0; foreach (MapNode[] mapNodeRow in mapNodeRowsToAdd) { xValuesAdded = 0; foreach (MapNode node in mapNodeRow) { // [y, x] may seem backwards, but mapNodes[y] == the yth row mapNodes[yValuesAdded, xValuesAdded] = node; xValuesAdded++; } yValuesAdded++; } return pathNodes; } The above function seems to work pretty well, but it hasn't been subjected to bulletproof testing yet.

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  • How to MakeTable ReadOnly including contents like images

    - by GustlyWind
    I have a table which has two text boxes and a image beside it to click and open a popup. In read-only mode based on condition I am able to make text boxes read-only but images are not becoming read-only.One solution I had is the anchor tag associated with image calls for JavaScript where I can check for a dummy click when it is in read-only mode. The problem here is the function is common and effects everywhere. So is there a way to make the entire table read-only so that no extra workaround needs to done. Edited for code <table> <tr> <td class="lightbg" colspan='4'>&nbsp; Expires:<input type="TEXT" value="" id="element1" name="expireDate" size="10" maxlength="20" class="" onChange="javascript:validateDateEntry('element1',true);;"> Period:<input type="TEXT" value="" id="element2" name="refershDate" size="10" maxlength="20" class="" onChange="javascript:validateDateEntry('element2',true);;"> &nbsp; <a href="javascript:doCalendar('element1');"> <img src="/PWM/images/images_2006/calendarbtn.gif" border="0" alt="Click to select date from calendar" align="absmiddle"> </a> </td> </tr> <tr> <td colspan='4'><b>*</b>Times are in the WFM Server's Time Zone.</td></tr> </table> Thanks

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  • Performance Optimization for Matrix Rotation

    - by Summer_More_More_Tea
    Hello everyone: I'm now trapped by a performance optimization lab in the book "Computer System from a Programmer's Perspective" described as following: In a N*N matrix M, where N is multiple of 32, the rotate operation can be represented as: Transpose: interchange elements M(i,j) and M(j,i) Exchange rows: Row i is exchanged with row N-1-i A example for matrix rotation(N is 3 instead of 32 for simplicity): ------- ------- |1|2|3| |3|6|9| ------- ------- |4|5|6| after rotate is |2|5|8| ------- ------- |7|8|9| |1|4|7| ------- ------- A naive implementation is: #define RIDX(i,j,n) ((i)*(n)+(j)) void naive_rotate(int dim, pixel *src, pixel *dst) { int i, j; for (i = 0; i < dim; i++) for (j = 0; j < dim; j++) dst[RIDX(dim-1-j, i, dim)] = src[RIDX(i, j, dim)]; } I come up with an idea by inner-loop-unroll. The result is: Code Version Speed Up original 1x unrolled by 2 1.33x unrolled by 4 1.33x unrolled by 8 1.55x unrolled by 16 1.67x unrolled by 32 1.61x I also get a code snippet from pastebin.com that seems can solve this problem: void rotate(int dim, pixel *src, pixel *dst) { int stride = 32; int count = dim >> 5; src += dim - 1; int a1 = count; do { int a2 = dim; do { int a3 = stride; do { *dst++ = *src; src += dim; } while(--a3); src -= dim * stride + 1; dst += dim - stride; } while(--a2); src += dim * (stride + 1); dst -= dim * dim - stride; } while(--a1); } After carefully read the code, I think main idea of this solution is treat 32 rows as a data zone, and perform the rotating operation respectively. Speed up of this version is 1.85x, overwhelming all the loop-unroll version. Here are the questions: In the inner-loop-unroll version, why does increment slow down if the unrolling factor increase, especially change the unrolling factor from 8 to 16, which does not effect the same when switch from 4 to 8? Does the result have some relationship with depth of the CPU pipeline? If the answer is yes, could the degrade of increment reflect pipeline length? What is the probable reason for the optimization of data-zone version? It seems that there is no too much essential difference from the original naive version. EDIT: My test environment is Intel Centrino Duo processor and the verion of gcc is 4.4 Any advice will be highly appreciated! Kind regards!

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  • Autoincrement uniqueidentifier in C#

    - by drasto
    Basically I want to use uniqueidentifier in similar way as identity. I don't want to insert values into it, It should just insert values automatically, different value for each row. I'm not able to set autoincrement on columns of type uniqueidentifier(the property 'autoincrement' is set to false and is not editable).

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  • Do a query only if there are no results on previous query

    - by yes123
    Hi guys: I do this query(1): (1)SELECT * FROM t1 WHERE title LIKE 'key%' LIMIT 1 I need to do a second(2) query only if this previous query has no results (2)SELECT * FROM t1 WHERE title LIKE '%key%' LIMIT 1 basically i need only 1 row who got the most close title to my key. Atm i am using an UNION query with a custom field to order it and a LIMIT 1. Problem is I don't want to do the others query if already the first made the result. Thanks

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  • How to resize table via javascript in IE?

    - by MartyIX
    I've got this table: <table id="correctness" style="overflow: hidden;"> <tr><td style="overflow: hidden;"> <div id="correctness-message"></div> <span class="hide"> <button type="button" class="hide" onclick="new DisplayEffect('correctness').Hide(500);">Hide</button> </span> </td> </tr> </table> and a function for resizing the table: function resize(element, size) { element.style.height = size + "px";}; which is called for a certain amount of time (e.g. 1 second) with the ID of table (i.e. "correctness") in order to resize the table from zero height to its full height. This code works in Firefox and Chrome but it doesn't work in IE8. What it does is that it displays right away whole table even thought the height set in "resize" method is much lower. It seems that the cell sets the height of parent table and not the other way around. Is it possible to change the behaviour? I like changing the height of the table better because I can set visibility of the table easily. Thanks for any help!

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  • PHP / C++ space calculations for parcel packing

    - by Andrew Willis
    I am working on a shopping cart project which requires a 'postage calculator' based on items that the person has in their cart. Obviously I will be storing the item's dimensions incl. weight and padding in a database and will also store the parcel (box) size and weight that the items will go in to, incl. box padding. Figuring the weight of the parcels will be easy but I was wondering how to go about figuring how to pack the box via PHP, that is, I would like the code to 'play tetris' with the items to make sure they get the best possible fit, giving accurate postage costs. Does anybody have any ideas on how best to achieve this or does anybody know of a PHP Class or function that can do this? EDIT: When I said 'best possible fit' maybe I was being optimistic! Having the script try every possible combination of package distribution within the parcel would be over the top, however I could improve the speed by writing the algoritm in C++ and running the program in PHP when the user 'checks out', the return value being an array with the parcel size and weight (which are all that are needed to calculate postage costs)

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  • How to use an UpdatePanel inside a Reapeater ItemTemplate with a HTML Table

    - by vanslly
    I want to allow the user to edit by data by row, so only need content updated by row. I managed to achieve this by using a Repeater with a UpdatePanel in the ItemTemplate. Using a div <asp:ScriptManager ID="ctlScriptManager" runat="server" /> <asp:Repeater ID="ctlMyRepeater" runat="server"> <ItemTemplate> <div> <asp:UpdatePanel ID="ctlUpdatePanel" runat="server"> <ContentTemplate> <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' /> <asp:LinkButton ID="btnRename" runat="server" CommandArgument='<%# Eval("ID") %>' CommandName="Rename">Rename...</asp:LinkButton> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="btnRename" EventName="Click" /> </Triggers> </asp:UpdatePanel> </div> </ItemTemplate> </asp:Repeater> But, I want to use a table to ensure structure and spacing and CSS styling wasn't doing it for me, but when I use a table everything goes whacky. Using a Table <asp:ScriptManager ID="ctlScriptManager" runat="server" /> <table> <asp:Repeater ID="ctlMyRepeater" runat="server"> <ItemTemplate> <asp:UpdatePanel ID="ctlUpdatePanel" runat="server"> <ContentTemplate> <tr> <td> <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' /> </td> <td> <asp:LinkButton ID="btnRename" runat="server" CommandArgument='<%# Eval("ID") %>' CommandName="Rename">Rename...</asp:LinkButton> </td> </tr> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="btnRename" EventName="Click" /> </Triggers> </asp:UpdatePanel> </ItemTemplate> </asp:Repeater> </table> What's the best way to solve this problem? I prefer using a table, because I really want to enfore structure without reliance on CSS. Thanks in advance.

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  • iPhone: How to purge a cached UITableViewCell

    - by iPhone dev
    iPhone SDK question: Does anyone have suggestions on how to purge a cached UITableViewCell I'd like to cache these cells with reuseIdentifier. However, there are times when I need to delete or modify some of the table rows. I expect to call reloadData after the row changes. Right now, dequeueReusableCellWithIdentifier always returns the cached(obsolete) entry from before. How do I indicate that the cache is stale and needs to be purged ?

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  • Beginner problem with posting data table to JsonResult

    - by ognjenb
    With this script I get data from JsonResult (GetDevicesTable) and put them to table ( id="OrderDevices") <script type="text/javascript"> $(document).ready(function() { $("#getDevices a").click(function() { var Id = $(this).attr("rel"); var rowToMove = $(this).closest("tr"); $.post("/ImportXML/GetDevicesTable", { Id: Id }, function(data) { if (data.success) { //remove row rowToMove.fadeOut(function() { $(this).remove() }); //add row to other table $("#OrderDevices").append("<tr><td>"+ data.DeviceId+ "</td><td>" + data.Id+ "</td><td>" + data.OrderId + "</td></tr>"); } else { alert(data.ErrorMsg); } }, "json"); }); }); <% using (Html.BeginForm()) {%> <table id="OrderDevices" class="data-table"> <tr> <th> DeviceId </th> <th> Id </th> <th> OrderId </th> </tr> </table> <p> <input type="submit" value="Submit" /> </p> <% } %> When click on Submit I need something like this: $(document).ready(function() { $("#submit").click(function() { var Id = $(this).attr("rel"); var DeviceId = $(this).attr(???); var OrderId = $(this).attr(???); var rowToMove = $(this).closest("tr"); $.post("/ImportXML/DevicesActions", { Id: Id, DeviceId:DeviceId, OrderId:OrderId }, function(data) { }, "json"); }); }); I have problem with this script because do not know how post data to this JsonResult: public JsonResult DevicesActions(int Id,int DeviceId,int OrderId) { orderdevice ord = new orderdevice(); ord.Id = Id; ord.OrderId = DeviceId; ord.DeviceId = OrderId; DBEntities.AddToorderdevice(ord); DBEntities.SaveChanges(); }

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  • How to Read some of the properties of the ItemSource when Laying out the Children?

    - by user275561
    Assume that I have the ItemSource bound and i am getting the data. Now what I want is this. The ItemSource will contain Data that tells where each button should be. For Example: The first Button could be at Left:200,Top:0, the Second could be Left:50 Top:20. </ItemsControl.Resources> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <Controls:MatrixCanvas /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> <ItemsControl.ItemTemplate> <DataTemplate> <item:CustomButton Height="{Binding btnSize}" Width="{Binding btnSize}" Style="{Binding bbColor,Converter={StaticResource ButtonStyleConverter}}" /> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> protected override Size ArrangeOverride(Size finalSize) { foreach (var child in Children) { //The child } return base.ArrangeOverride(finalSize); } The Child however is not giving me access to the Item that I want. Is their a good solution for this? Am I going about this the wrong way? The reason I am doing it like this is because their can be buttons added dynamically, removed, some buttons will need to move around etc..

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  • pagination in jsf

    - by gurupriyan.e
    I would like your comments and suggestion on this. I am doing the pagination for a page in jsf. The datatable is bound to a Backing Bean property through the "binding" attribute. I have 2 boolean variables to determine whether to render 'Prev' and 'Next' Button - which is displayed below the datatable. When either the 'Prev' or 'Next' button is clicked, In the backing bean I get the bound dataTable property and through which i get the "first" and "rows" attribute of the datatable and change accordingly. I display 5 rows in the page. Please comment and suggest if there any better ways. btw, I am not interested in any JSF Component libraries but stick to only core html render kit. public String goNext() { UIData htdbl = getBrowseResultsHTMLDataTable1(); setShowPrev(true); //set Rows "0" or "5" if(getDisplayResults().size() - (htdbl.getFirst() +5)>5 ) { htdbl.setRows(5);//display 5 rows }else if (getDisplayResults().size() - (htdbl.getFirst() +5)<=5) { htdbl.setRows(0);//display all rows (which are less than 5) setShowNext(false); } //set First htdbl.setFirst(htdbl.getFirst()+5); return "success"; } public String goPrev() { setShowNext(true); UIData htdbl = getBrowseResultsHTMLDataTable1(); //set First htdbl.setFirst(htdbl.getFirst()-5); if(htdbl.getFirst()==0) { setShowPrev(false); } //set Rows - always display 5 htdbl.setRows(5);//display 5 rows return "success"; }

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  • Databinding a property with a parameter

    - by clawson
    I would like to databind to a property that requires arguments. What is the best way do to this? are there work arounds? I'm open to any suggestions. I thought about defining custom columns and cells because the parameters that the property requires are available from the within the object bound to the row, but I'm having trouble materialising this idea. Thanks in advance for the help.

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  • dynamically created arrays

    - by DevAno1
    My task consists of two parts. First I have to create globbal char array of 100 elements, and insert some text to it using cin. Afterwards calculate amount of chars, and create dedicated array with the length of the inputted text. I was thinking about following solution : char[100]inputData; int main() { cin >> inputData >> endl; int length=0; for(int i=0; i<100; i++) { while(inputData[i] == "\0") { ++count; } } char c = new char[count]; Am I thinking good ? Second part of the task is to introduce in the first program dynamically created array of pointers to all inserted words. Adding a new word should print all the previous words and if there is no space for next words, size of the inputData array should be increased twice. And to be honest this is a bit too much for me. How I can create pointers to words specifically ? And how can I increase the size of global array without loosing its content ? With some temporary array ?

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  • Maintaining a pool of DAO Class instances vs doing new operator

    - by Fazal
    we have been trying to benchmark our application performance in multiple way for sometime now. I always believed that object creation in java using Class.newInstance() was not slow (at least after 1.4 version of java). But we anyways did a test to use newInstance method vs mainitain an object pool of 1000 objects. We did about 200K iterations of loading data from DB using JDBC and populating these objects. I was amazed (even shocked) to see that newInstance code compared to object pool code was almost 10 times slower. These objects represent tables with about 50 fields and all string type. Can someone share there thoughts on this issue as now I am more confused if object pooling of atleast some DAO instances is a better option. The pool size as I see right now should be large enough to meet size of average requests. There is a flip side as my memory footprint will go up but I am beginning to wonder if this kind of idea makes sense atleast for some of the DAO entities representing tables of about 50 or more columns Please share your ideas and let me know if this has been tried by someone or am I missing some point here

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  • In SQL, what's the difference between count(column) and count(*)?

    - by Bill the Lizard
    I have the following query: select column_name, count(column_name) from table group by column_name having count(column_name) > 1; What would be the difference if I replaced all calls to count(column_name) to count(*)? This question was inspired by a previous one. Edit: To clarify the accepted answer (and maybe my question), using count(*) in this case returns an extra row in the result that contains a null and the count of null values in the column.

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  • Why do I get rows of zeros in my 2D fft?

    - by Nicholas Pringle
    I am trying to replicate the results from a paper. "Two-dimensional Fourier Transform (2D-FT) in space and time along sections of constant latitude (east-west) and longitude (north-south) were used to characterize the spectrum of the simulated flux variability south of 40degS." - Lenton et al(2006) The figures published show "the log of the variance of the 2D-FT". I have tried to create an array consisting of the seasonal cycle of similar data as well as the noise. I have defined the noise as the original array minus the signal array. Here is the code that I used to plot the 2D-FT of the signal array averaged in latitude: import numpy as np from numpy import ma from matplotlib import pyplot as plt from Scientific.IO.NetCDF import NetCDFFile ### input directory indir = '/home/nicholas/data/' ### get the flux data which is in ### [time(5day ave for 10 years),latitude,longitude] nc = NetCDFFile(indir + 'CFLX_2000_2009.nc','r') cflux_southern_ocean = nc.variables['Cflx'][:,10:50,:] cflux_southern_ocean = ma.masked_values(cflux_southern_ocean,1e+20) # mask land nc.close() cflux = cflux_southern_ocean*1e08 # change units of data from mmol/m^2/s ### create an array that consists of the seasonal signal fro each pixel year_stack = np.split(cflux, 10, axis=0) year_stack = np.array(year_stack) signal_array = np.tile(np.mean(year_stack, axis=0), (10, 1, 1)) signal_array = ma.masked_where(signal_array > 1e20, signal_array) # need to mask ### average the array over latitude(or longitude) signal_time_lon = ma.mean(signal_array, axis=1) ### do a 2D Fourier Transform of the time/space image ft = np.fft.fft2(signal_time_lon) mgft = np.abs(ft) ps = mgft**2 log_ps = np.log(mgft) log_mgft= np.log(mgft) Every second row of the ft consists completely of zeros. Why is this? Would it be acceptable to add a randomly small number to the signal to avoid this. signal_time_lon = signal_time_lon + np.random.randint(0,9,size=(730, 182))*1e-05 EDIT: Adding images and clarify meaning The output of rfft2 still appears to be a complex array. Using fftshift shifts the edges of the image to the centre; I still have a power spectrum regardless. I expect that the reason that I get rows of zeros is that I have re-created the timeseries for each pixel. The ft[0, 0] pixel contains the mean of the signal. So the ft[1, 0] corresponds to a sinusoid with one cycle over the entire signal in the rows of the starting image. Here are is the starting image using following code: plt.pcolormesh(signal_time_lon); plt.colorbar(); plt.axis('tight') Here is result using following code: ft = np.fft.rfft2(signal_time_lon) mgft = np.abs(ft) ps = mgft**2 log_ps = np.log1p(mgft) plt.pcolormesh(log_ps); plt.colorbar(); plt.axis('tight') It may not be clear in the image but it is only every second row that contains completely zeros. Every tenth pixel (log_ps[10, 0]) is a high value. The other pixels (log_ps[2, 0], log_ps[4, 0] etc) have very low values.

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