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• AVG time spent on multiple rows SQL-server?

  - by seo20

  I have a table tblSequence with 3 cols in MS SQL: ID, IP, [Timestamp] Content could look like this: ID IP [Timestamp] -------------------------------------------------- 4347 62.107.95.103 2010-05-24 09:27:50.470 4346 62.107.95.103 2010-05-24 09:27:45.547 4345 62.107.95.103 2010-05-24 09:27:36.940 4344 62.107.95.103 2010-05-24 09:27:29.347 4343 62.107.95.103 2010-05-24 09:27:12.080 ID is unique, there can be n number of IP's. Would like to calculate the average time spent per IP. in a single row Know you can do something like this: SELECT CAST(AVG(CAST(MyTable.MyDateTimeFinish - MyTable.MyDateTimeStart AS float)) AS datetime) But how on earth do I find the first and last entry of my unique IP row so I can have a start and finish time? I'M stuck. Would like to calculate the average time spent per IP. in a single row

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• Type patterns and generic classes in Haskell

  - by finnsson

  I'm trying to understand type patterns and generic classes in Haskell but can't seem to get it. Could someone explain it in laymen's terms? In [1] I've read that "To apply functions generically to all data types, we view data types in a uniform manner: except for basic predefined types such as Float, IO, and ?, every Haskell data type can be viewed as a labeled sum of possibly labeled products." and then Unit, :*: and :+: are mentioned. Are all data types in Haskell automatically versions of the above mentioned and if so how do I figure out how a specific data type is represented in terms of :*:, etc? The users guide for generic classes (ch. 7.16) at haskell.org doesn't mention the predefined types but shouldn't they be handled in every function if the type patterns should be exhaustive? [1] Comparing Approaches to Generic Programming in Haskell, Ralf Hinze, Johan Jeuring, and Andres Löh

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• -webkit- vs -moz-transition

  - by danixd

  I am using CSS3 transitions on my site and the -webkit- seems to be working, whilst the -moz- is not. Here is the CSS: article {z-index: 2; float: left; overflow: hidden; position: relative; -webkit-transition: -webkit-transform 0.2s ease-in-out; -moz-transition: -moz-transform 0.2s ease-in-out; } .mousedown{-webkit-transform: translate(-180px, 0) !important; -moz-transform: translate(-180px, 0) !important; } Just using jQeury to add the mousedown class onto the article. Any idea where I am going wrong?

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• sampling integers uniformly efficiently in python using numpy/scipy

  - by user248237

  I have a problem where depending on the result of a random coin flip, I have to sample a random starting position from a string. If the sampling of this random position is uniform over the string, I thought of two approaches to do it: one using multinomial from numpy.random, the other using the simple randint function of Python standard lib. I tested this as follows: from numpy import * from numpy.random import multinomial from random import randint import time def use_multinomial(length, num_points): probs = ones(length)/float(length) for n in range(num_points): result = multinomial(1, probs) def use_rand(length, num_points): for n in range(num_points): rand(1, length) def main(): length = 1700 num_points = 50000 t1 = time.time() use_multinomial(length, num_points) t2 = time.time() print "Multinomial took: %s seconds" %(t2 - t1) t1 = time.time() use_rand(length, num_points) t2 = time.time() print "Rand took: %s seconds" %(t2 - t1) if __name__ == '__main__': main() The output is: Multinomial took: 6.58072400093 seconds Rand took: 2.35189199448 seconds it seems like randint is faster, but it still seems very slow to me. Is there a vectorized way to get this to be much faster, using numpy or scipy? thanks.

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• Android 2.2: Screen brightness/timeout question

  - by Johan

  Im using the following code to adjust the brightness of the screen: public void SetBright(float value) { Window mywindow = getWindow(); WindowManager.LayoutParams lp = mywindow.getAttributes(); lp.screenBrightness = value; mywindow.setAttributes(lp); } But i want the brightness to be 0% for a specific time. But when i use SetBright(0.0f), i cant change it back. I made a timer that runs for a minute with 0% brightness, then turns it back to 100%. Works when i use 10% for example. But when i turn it to 0% i cant seem to wake it up again. Any ideas how to solve this?

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• The use of IN OUT in ada..

  - by maddy

  HI all, Given below is a code in ada with TYPE_VECT_B; use TYPE_VECT_B; Package TEST01 is procedure TEST01 ( In_State : IN VECT_B ; Out_State : IN OUT VECT_B ); function TEST02 ( In_State : IN VECT_B ) return Boolean ; end TEST01; The TYPE_VECT_B package specification and body is also defined below Package TYPE_VECT_B is type VECT_B is array (INTEGER range <>) OF BOOLEAN ; rounded_data : float ; count : integer ; trace : integer ; end TYPE_VECT_B; Package BODY TYPE_VECT_B is begin null; end TYPE_VECT_B; What does the variable In_State and Out_State actually mean?I think In_State means input variable.i just get confused to what actually Out_State means? Thanks Maddy

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• align an iframe

  - by Gaurav

  I have a html page and I want to align an iframe at the bottom of the page such that the iframe occupies all the width , I am unable to align the iframe at the bottom.Please find the iframe tag at the bottom of the page. <html> <body> <p>The rest of the code has not been mentioned to reduce code overflow.</p> <p>I want to align the iframe after a long page having no. of jquery , images etc.</p> <iframe src ="bottom.html" width="100%" height="200" style="float:bottom" scrolling="no" frameborder="0"> <p>Your browser does not support iframes.</p> </iframe> </body> </html>

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• Should you correct compiler warnings about type conversions using explicit typecasts?

  - by BastiBechtold

  In my current project, the compiler shows hundreds of warnings about type conversions. There is a lot of code like this iVar = fVar1*fVar2/fVar3; // or even iVar = fVar1*fVar2/fVar3+.5f; which intentionally assign float values to int. Of course, I could fix these warnings using iVar = int(...); but that looks kind of ugly. Would you rather live with the ugliness or live with the warnings? Or is there even a clean solution?

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• Memory address of a variable

  - by dotnetvoyager

  Hi Everyone, Is it possible to get the memory address of a variable in C#. What I am trying to do is very simple. I want to declare variables of type Double, Float, Decimal and assign the value 1.1 to each of these variables. Then I would like to go and see how these values are represented in memory. I need to get the memory address of the variable in order to see how its stored in memory. Once I have the memory address I plan to put a break point in the code and use the Debug - Windows - Memory option in visual studio to see how the numbers are stored in memory. Cheers,

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• SimpleXML adding html into Hash tree

  - by Miriam Raphael Roberts

  Question: I have an xml file that I am pulling from the web and parsing. One of the items in the xml is a 'content' value that has HTML. I am using SimpleXML/XMLin to parse the file like so: $xml= eval { $data-XMLin($xmldata, forcearray = 1, suppressempty= +'') }; When I use Dumper to dump the hash, I dsicovered that SimpleXML is parsing the HTML into the hash tree. 'content' => { 'div' => [ { 'xmlns' => 'http://www.w3.org/1999/xhtml', 'p' => [ { 'a' => [ { 'href' => 'http://miamiherald.typepad.com/.a/6a00d83451b26169e20133ec6f4491970b-pi', 'style' => 'FLOAT: left', 'img' => [ etc..... This is not what I want. I want to just grab content inside of this entry. How do I do this?

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• Looking for C# framework for plotting scientific data: 2d/3d ...

  - by Ivan

  I need to visualize some scientific calculations. I generally prefer reusing code if there is already a good available instead of inventing wheels each time, that's why I am asking. I need a C# code to draw charts (just outputting a bitmap is ok) of 2d (y=f(x)) and 3d (z=f(x,y)) digital data sets (where any axis can be float, int or datetime), sometimes combined. If I go here and click 3D in the navigation bar on the left, there I can see what I need. But the cheapest version costs $759 there, looks scary for a hobby project of an east-european student :-(

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• Simplest way to use isdigit and isalpha commands ?

  - by ZaZu

  Hello, Can anyone briefly explain how do these two commands work ? isdigit and isalpha .. Ofcourse I read online sources before asking the question, but unfortunately I tried them and didnt get them to work. What is the simplest way ? I know it gives back a value, so im assuming I can use it like this : if(isdigit(someinput)==1) return -1; Is that correct ? can I use this for any number ? Can I compare it with a float number ? Can I compare arrays ? Can I also use it when scanning documents or files ? For example, if I want to scanf a text file that has numbers and letters, and determine is what im scanning (isdigit) or (isalpha) ?? Thanks :)

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• LINQ-to-XML to DataGridView: Cannot edit fields -- How to fix?

  - by Pretzel

  I am currently doing LINQ-to-XML and populating a DataGridView with my query just fine. The trouble I am running into is that once loaded into the DataGridView, the values appear to be Un-editable (ReadOnly). Here's my code: var barcodes = (from src in xmldoc.Descendants("Container") where src.Descendants().Count() > 0 select new { Id = (string)src.Element("Id"), Barcode = (string)src.Element("Barcode"), Quantity = float.Parse((string)src.Element("Quantity").Attribute("value")) }).Distinct(); dataGridView1.DataSource = barcodes.ToList(); I read somewhere that the "DataGridView will be in ReadOnly mode when you use Anonymous types." But I couldn't find an explanation why or exactly what to do about it. Any ideas?

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• Why setValue at not working on Jtable?

  - by Nitz

  Hey Guys I am doing project on java. In one of the class, I am working on jtable. Now what i am doing is, In the table data will be loaded from the database. Now i want to change some value at some exact row and column. so for that i am using jtable's setValue function. which is like this.... grayCardTbl.setValueAt(Float.valueOf(String.valueOf(pdiff)),1,4); I have checked the "pdiff" variable, it is perfect. i had total 5 columns and 10 rows. So now problem with rowindex and column index. and after this i have also refresh the table. but still it is not reflecting on table.

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• function prototype declarations

  - by sandy101

  I am practice the function in c and come across to the program .... #include<stdio.h> int main() { float a=15.5; char ch ='C'; printit(a,ch); return 0; } printit(a,ch) { printf("%f\n%c",a,ch); } I want to know that why the above program compile and not give the error as i understood so for is ... The function in c must be declared with the specific prototype (but this program does not contain the prototype) why the program give the output 'x'for the char variable ? can the function in c are capable of accepting the value without being declared about type in parameters like what has done in the function declaration ?

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• on click checkbox set input attr

  - by Tommy Arnold

  html form with 4 columns the first 2 columns are the sizes inside input boxes with disabled ='disabled', when they click radio button to select a size a checkbox appears, when they click that checkbox I would like to change the class and disabled attr of the inputs on that table row to allow them to edit the input box <table width="388" border="1" id="product1"> <tr> <td width="100">Width</td> <td width="100">Height</td> <td width="48">Price</td> <td width="65">Select</td> </tr> <tr> <td><input type="text" disabled='disabled'value="200"/><span> CMS</span></td> <td><input disabled='disabled'type="text" value="500"/><span> CMS</span></td> <td>£50.00</td> <td><input type="radio" name="product1" value="size1" /> Customise<input type="checkbox" name="custom[size1]" class="custombox" value="1"/></td> </tr> <tr> <td>200</td> <td>1000</td> <td>£100.00</td> <td><input type="radio" name="product1" value="size2" /> Customise<input disabled='disabled' type="checkbox" name="custom[size2]" class="custombox" value="1"/></td> </tr> <tr> <td>200</td> <td>1500</td> <td>£150</td> <td><input type="radio" name="product1" value="size3" /> Customise<input type="checkbox" name="custom[size3]" class="custombox" value="1"/></td> </tr> </table> <table width="288" border="1" id="product2"> <tr> <td width="72">Width</td> <td width="75">Height</td> <td width="48">Price</td> <td width="65">&nbsp;</td> </tr> <tr> <td>200</td> <td>500</td> <td>£50.00</td> <td><input type="radio" name="product2" value="size1" /> Customise<input type="checkbox" name="custom[size1]" class="custombox" value="1"/></td> </tr> <tr> <td>200</td> <td>1000</td> <td>£100.00</td> <td><input type="radio" name="product2" value="size2" /> Customise<input type="checkbox" name="custom[size2]" class="custombox" value="1"/></td> </tr> <tr> <td>200</td> <td>1500</td> <td>£150</td> <td><input type="radio" name="product2" value="size3" /> Customise<input type="checkbox" name="custom[size3]" class="custombox" value="1"/></td> </tr> <table> CSS input[type=checkbox] { display: none; } input[type=checkbox].shown { display: inline; } input .edit{ border:1px solid red; } input[disabled='disabled'] { border:0px; width:60px; padding:5px; float:left; background:#fff; } span{float:left; width:30px; padding:5px;} Jquery $("body :checkbox").hide(); // The most obvious way is to set radio-button click handlers for each table separatly: $("#product1 :radio").click(function() { $("#product1 :checkbox").hide(); $("#product1 .cbox").hide(); $(this).parent().children(":checkbox").show(); $(this).parent().children(".cbox").show(); }); $("#product2 :radio").click(function() { $("#product2 :checkbox").hide(); $("#product2 .cbox").hide(); $(this).parent().children(":checkbox").show(); $(this).parent().children(".cbox").show(); }); This is what I thought but its not working $("#product1 :checkbox").click(function(){ $(this).parent("tr").children("td :input").attr('disabled',''); $(this).parent("tr").children("td :input").toggleClass(edit); }); $("#product2 :checkbox").click(function(){ $(this).parent("tr").children("td :input").attr('disabled',''); $(this).parent("tr").children("td :input").toggleClass(edit); }); Thanks in advance for any help.

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• Masking to Transparent returns empty image

  - by Tibi

  Hi there, I'm trying to put white color in my images to transparent with the following code. Problem is that "CGImageRef maskedTransparent" is blank. I don't understand because the code I'm using is nearly a copy paste from the doc ... Any idea ? (UIImage*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage { CGImageRef maskRef = maskImage.CGImage; CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), CGImageGetBitsPerPixel(maskRef), CGImageGetBytesPerRow(maskRef), CGImageGetDataProvider(maskRef), NULL, false); CGImageRef masked = CGImageCreateWithMask([image CGImage], mask); //Array defining min & max RGB values to be transformed to transparent colors. float maskingMinMax[6] = {255, 255, 255, 255, 255, 255}; //masking image to remove range in maskinLinMax CGImageRef maskedTransparent = CGImageCreateWithMaskingColors(masked, maskingMinMax); return [UIImage imageWithCGImage:maskedTransparent]; }

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• How to add columns to sqlite3 python?

  - by user291071

  I know this is simple but I can't get it working! I have no probs with insert,update or select commands, Lets say I have a dictionary and I want to populate a table with the column names in the dictionary what is wrong with my one line where I add a column? ##create con = sqlite3.connect('linksauthor.db') c = con.cursor() c.execute('''create table linksauthor (links text)''') con.commit() c.close() ##populate author columns allauthors={'joe':1,'bla':2,'mo':3} con = sqlite3.connect('linksauthor.db') c = con.cursor() for author in allauthors: print author print type(author) c.execute("alter table linksauthor add column '%s' 'float'")%author ##what is wrong here? con.commit() c.close()

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• UIButton custom font vertical alignment

  - by Willshaw Media

  I've got a UIButton which uses a custom font, which is set when my view loads: - (void)viewDidLoad { [super viewDidLoad]; self.searchButton.titleLabel.font = [UIFont fontWithName: @"FONTNAME" size: 15.0 ]; } The problem I've got is that the font is appearing to float up of the center line. If I comment out this line, the default font appears vertically centered fine. But changing to the custom font breaks the vertical alignment. I'm getting the same issue on a Table Cell with a custom font too. Do I need to tell the view somewhere that the custom font is not as tall as other fonts? EDIT: I've just realized that the font I'm using is a Windows TrueType Font. I can use it fine in TextEdit on the Mac, only a problem with the alignment in my App

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• Python or matplotlib limitation error

  - by Werner

  Hi, I wrote an algorithm using python and matplotlib that generates histograms from some text input data. When the number of data input is approx. greater than 15000, I get in the (append) line of my code: mydata = [] for i in range(len(data)): mydata.append(string.atof(data[i])) the error: Traceback (most recent call last): File "get_histogram_picture.py", line 25, in <module> mydata.append(string.atof(data[i])) File "/usr/lib/python2.6/string.py", line 388, in atof return _float(s) ValueError: invalid literal for float(): -a can it be an error in python ? What is the solution ? Thanks

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• python: strange behavior about exec statement

  - by ifocus

  exec statement: exec code [ in globals[, locals]] When I execute the following code in python, the result really confused me. Some of the variables were setup into the globals, some were setup into the locals. s = """ # test var define int_v1 = 1 list_v1 = [1, 2, 3] dict_v1 = {1: 'hello', 2:'world', 3:'!'} # test built-in function list_v2 = [float(x) for x in list_v1] len_list_v1 = len(list_v1) # test function define def func(): global g_var, list_v1, dict_v1 print 'access var in globals:' print g_var print 'access var in locals:' for x in list_v1: print dict_v1[x] """ g = {'__builtins__': __builtins__, 'g_var': 'global'} l = {} exec s in g, l print 'globals:', g print 'locals:', l exec 'func()' in g, l the result in python2.6.5: globals: {'__builtins__': <module '__builtin__' (built-in)>, 'dict_v1': {1: 'hello', 2: 'world', 3: '!'}, 'g_var': 'global', 'list_v1': [1, 2, 3]} locals: {'int_v1': 1, 'func': <function func at 0x00ACA270>, 'x': 3, 'len_list_v1': 3, 'list_v2': [1.0, 2.0, 3.0]} access var in globals: global access var in locals: hello world ! And if I want to setup all variables and functions into the locals, and keep the rights of accessing the globals. How to do ?

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• Calling unmanaged c++ code in C# Mixed with STL

  - by Turtle

  Hey, I want to call unmanaged c++ code in C# The function interface is like following(I simplified it to make it easy to understand) Face genMesh(int param1, int param2); Face is a struct defined as: struct Face{ vector<float> nodes; vector<int> indexs; } I googled and read the MSDN docs found ways to call simple c/c++ unmanged code in C#, also know how to hand the struct as return value. And My question is how to handle "vector". I did not find rules about mapping between vector and some types in C# Thanks!

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• Is there an exponent operator in C#?

  - by Charlie

  For example, does an operator exist to handle this? float Result, Number1, Number2; Number1 = 2; Number2 = 2; Result = Number1 (operator) Number2; In the past the ^ operator has served as an exponential operator in other languages, but in C# it is a bit-wise operator. Do I have to write a loop or include another namespace to handle exponential operations? If so, how do I handle exponential operations using non-integers?

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• MySQL floating point comparison issues

  - by Sharief

  I ran into an issue by introducing floating point columns in the MySQL database schema that the comparisons on floating point values don't return the correct results always. 1 - 50.12 2 - 34.57 3 - 12.75 4 - ...(rest all less than 12.00) SELECT COUNT(*) FROM `users` WHERE `points` > "12.75" This returns me "3". I have read that the comparisons of floating point values in MySQL is a bad idea and decimal type is the better option. Do I have any hope of moving ahead with the float type and get the comparisons to work correctly?

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• How to access a structure member in a function that get it as void* type?

  - by Ahmad

  I want to have a function that accepts different type of structures as argument. So, since I don't have a specific type, I have to use void*. Now question is: when I pass a structure to this function, how can I access a known member of this structure inside the function? Specifically, I know that all structures have str1 as a member and I want, for example, print it. Here is a sample code: struct { char* str1; float tt1; } var1 = {"This is me", 12}; struct { char* str1; int tt2; } var2 = {"This is you", 18}; void printStruct(void* str) { printf("\n the structure string is %s", ??); //can I put something in ?? to print the string? } main(....) { printStruct(&var1); printStruct(&var2); }

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