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• Using game of life or other virtual environment for artificial (intelligence) life simulation? [clos

  - by Berlin Brown

  One of my interests in AI focuses not so much on data but more on biologic computing. This includes neural networks, mapping the brain, cellular-automata, virtual life and environments. Described below is an exciting project that includes develop a virtual environment for bots to evolve in. "Polyworld is a cross-platform (Linux, Mac OS X) program written by Larry Yaeger to evolve Artificial Intelligence through natural selection and evolutionary algorithms." http://en.wikipedia.org/wiki/Polyworld " Polyworld is a promising project for studying virtual life but it still is far from creating an "intelligent autonomous" agent. Here is my question, in theory, what parameters would you use create an AI environment? Possibly a brain environment? Possibly multiple self contained life organisms that have their own "brain" or life structures. I would like a create a spin on the game of life simulation. What if you have a 64x64 game of life grid. But instead of one grid, you might have N number of grids. The N number of grids are your "life force" If all of the game of life entities die in a particular grid then that entire grid dies. A group of "grids" makes up a life form. I don't have an immediate goal. First, I want to simulate an environment and visualize what is going on in the environment with OpenGL and see if there are any interesting properties to the environment. I then want to add "scarce resources" and see if the AI environment can manage resources adequately.

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• foreignkey problem

  - by realshadow

  Hey, Imagine you have this model: class Category(models.Model): node_id = models.IntegerField(primary_key = True) type_id = models.IntegerField(max_length = 20) parent_id = models.IntegerField(max_length = 20) sort_order = models.IntegerField(max_length = 20) name = models.CharField(max_length = 45) lft = models.IntegerField(max_length = 20) rgt = models.IntegerField(max_length = 20) depth = models.IntegerField(max_length = 20) added_on = models.DateTimeField(auto_now = True) updated_on = models.DateTimeField(auto_now = True) status = models.IntegerField(max_length = 20) node = models.ForeignKey(Category_info, verbose_name = 'Category_info', to_field = 'node_id' The important part is the foreignkey. When I try: Category.objects.filter(type_id = 15, parent_id = offset, status = 1) I get an error that get returned more than category, which is fine, because it is supposed to return more than one. But I want to filter the results trough another field, which would be type id (from the second Model) Here it is: class Category_info(models.Model): objtree_label_id = models.AutoField(primary_key = True) node_id = models.IntegerField(unique = True) language_id = models.IntegerField() label = models.CharField(max_length = 255) type_id = models.IntegerField() The type_id can be any number from 1 - 5. I am desparately trying to get only one result where the type_id would be number 1. Here is what I want in sql: SELECT c.*, ci.* FROM category c JOIN category_info ci ON (c.node_id = ci.node_id) WHERE c.type_id = 15 AND c.parent_id = 50 AND ci.type_id = 1 Any help is GREATLY appreciated. Regards

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• Should I write more SQL to be more efficient, or less SQL to be less buggy?

  - by RenderIn

  I've been writing a lot of one-off SQL queries to return exactly what a certain page needs and no more. I could reuse existing queries and issue a number of SQL requests linear to the number of records on the page. As an example, I have a query to return People and a query to return Job Details for a person. To return a list of people with their job details I could query once for people and then once for each person to retrieve their job details. I've found that in most cases that solution returns things in a reasonable amount of time, but I don't know how well it will scale in my environment. Instead I've been writing queries to join people + job details, or people + salary history, etc. I'm looking at my models and I see how I could shave off maybe 30% of my code if I were to re-use existing queries. This is a big temptation. Is it a bad thing to go for reuse over efficiency in general or does it all come down to the specific situation? Should I first do it the easy way and then optimize later, or is it best to get the code knocked out while everything is fresh in my mind? Thoughts, experiences?

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• Too many open files in one of my java routine.

  - by Irfan Zulfiqar

  I have a multithreaded code that has to generated a set of objects and write them to a file. When I run it I sometime get "Too many open files" message in Exception. I have checked the code to make sure that all the file streams are being closed properly. Here is the stack trace. When I do ulimit -a, open files allowed is set to 1024. We think increasing this number is not a viable option / solution. [java] java.io.FileNotFoundException: /export/event_1_0.dtd (Too many open files) [java] at java.io.FileInputStream.open(Native Method) [java] at java.io.FileInputStream.<init>(FileInputStream.java:106) [java] at java.io.FileInputStream.<init>(FileInputStream.java:66) [java] at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70) [java] at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161) [java] at java.net.URL.openStream(URL.java:1010) Now what we have identified so far by looking closely at the list of open files is that the VM is opening same class file multiple times. /export/BaseEvent.class 236 /export/EventType1BaseEvent.class 60 /export/EventType2BaseEvent.class 48 /export/EventType2.class 30 /export/EventType1.class 14 Where BaseEvent is partent of all the classes and EventType1 ant EventType2 inherits EventType1BaseEvent and EventType2BaseEvent respectively. Why would a class loader load the same class file 200+ times. It seems it is opening up the base class as many time it create any child instance. Is this normal? Can it be handler any other way apart from increasing the number of open files?

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• Which home automation technology to choose? x10 zwave e.t.c. in UK [closed]

  - by Stewart Robinson

  I work away most of the week and have to leave my house empty. I would like to have home automation monitor and control my house. Naturally I want to be a bit of a geek and do some of it myself so I've researched stuff like x10, zwave, cbus e.t.c. but I want opinions on which I should use in my house. I have a Linux box that could be used to actually do controlling if needed. So which technology and why?

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• HATEOAS - Discovery and URI Templating

  - by Paul Kirby

  I'm designing a HATEOAS API for internal data at my company, but have been having troubles with the discovery of links. Consider the following set of steps for someone to retrieve information about a specific employee in this system: User sends GET to http://coredata/ to get all available resources, returns a number of links including one tagged as rel = "http://coredata/rels/employees" User follows HREF on the rel from the first request, performing a GET at (for example) http://coredata/employees The data returned from this last call is my conundrum and a situation where I've heard mixed suggestions. Here are some of them: That GET will return all employees (with perhaps truncated data), and the client would be responsible for picking the one it wants from that list. That GET would return a number of URI templated links describing how to query / get one employee / get all employees. Something like: "_links": { "http://coredata/rels/employees#RetrieveOne": { "href": "http://coredata/employees/{id}" }, "http://coredata/rels/employees#Query": { "href": "http://coredata/employees{?login,firstName,lastName}" }, "http://coredata/rels/employees#All": { "href": "http://coredata/employees/all" } } I'm a little stuck here with what remains closest to HATEOAS. For option 1, I really do not want to make my clients retrieve all employees every time for the sake of navigation, but I can see how using URI templating in example two introduces some out-of-band knowledge. My other thought was to use the RetrieveOne, Query, and All operations as my cool URLs, but that seems to violate the concept that you should be able to navigate to the resources you want from one base URI. Has anyone else managed to come up with a good way to handle this? Navigation is dead simple once you've retrieved one resource or a set of resources, but it seems very difficult to use for discovery.

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• Mini keyboard has no home/end keys; how to type them?

  - by Steve Crane

  Some months ago I needed a small keyboard and bought an Okion KM229 without noticing that it has no Home or End key. This makes it tricky to type as I'm so used to using these keys. I haven't yet figured out if there is a key combination that issues Home and End keystrokes. Does anyone have experience of these keyboards and know how to issue those keystrokes? The keyboard is used on a PC running Windows XP. I have used the contact form on the Okion USA web site to ask this question but received no response. Wikipedia suggests that Home and End keystrokes are issued with Fn-Left and Fn-Right on some limited size keyboards. I may have tried those but don't remember for sure. I will try them again though when I am on site again in a week or so. Any other thoughts would be welcomed in the meantime.

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• Laptop windows 7 power settings - screen display goes black after 1 minute

  - by Puneet Dudeja

  My laptop windows 7 power settings are not working since last week, i have tried using "Dim display after 5 hours" and "Dim Never" also, but my screen goes black after 1 minute. Any resolutions ? My laptop model is : Compaq Pressario CQ62 Graphics Card Information: Name Intel(R) HD Graphics PNP Device ID PCI\VEN_8086&DEV_0046&SUBSYS_1425103C&REV_02\3&11583659&0&10 Adapter Type Intel(R) HD Graphics (Core i3), Intel Corporation compatible Adapter Description Intel(R) HD Graphics Adapter RAM 1.21 GB (1,303,306,240 bytes) Installed Drivers igdumd64.dll,igd10umd64.dll,igdumdx32,igd10umd32 Driver Version 8.15.10.2119 INF File oem17.inf (iILKM0 section) Color Planes Not Available Color Table Entries 4294967296 Resolution 1366 x 768 x 59 hertz Bits/Pixel 32 Memory Address 0xD0000000-0xD03FFFFF Memory Address 0xC0000000-0xCFFFFFFF I/O Port 0x00004050-0x00004057 IRQ Channel IRQ 4294967294 I/O Port 0x000003B0-0x000003BB I/O Port 0x000003C0-0x000003DF Memory Address 0xA0000-0xBFFFF Driver c:\windows\system32\drivers\igdkmd64.sys (8.15.10.2119, 9.85 MB (10,326,784 bytes), 4/21/2010 6:18 PM) I am not able to solve my problem from any of the answers till now. The screen still goes dark and password screen appears after 1 minute of idle time.

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• mysql/algorithm: Weighting an average to accentuate differences from the mean

  - by Sai Emrys

  This is for a new feature on http://cssfingerprint.com (see /about for general info). The feature looks up the sites you've visited in a database of site demographics, and tries to guess what your demographic stats are based on that. All my demgraphics are in 0..1 probability format, not ratios or absolute numbers or the like. Essentially, you have a large number of data points that each tend you towards their own demographics. However, just taking the average is poor, because it means that by adding in a lot of generic data, the number goes down. For example, suppose you've visited sites S0..S50. All except S0 are 48% female; S0 is 100% male. If I'm guessing your gender, I want to have a value close to 100%, not just the 49% that a straight average would give. Also, consider that most demographics (i.e. everything other than gender) does not have the average at 50%. For example, the average probability of having kids 0-17 is ~37%. The more a given site's demographics are different from this average (e.g. maybe it's a site for parents, or for child-free people), the more it should count in my guess of your status. What's the best way to calculate this? For extra credit: what's the best way to calculate this, that is also cheap & easy to do in mysql?

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• DNS failover across multiple datacenters?

  - by Jae Lee

  I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all my efforts of making the system fully redundant, I still could not make our DNS redundant, which I think isn't an easy solution. Only thing I was able to find was to sign up for DNS failover from places like dnsme, etc .... but they cost too much for budding startups. Even their Corporate plan only gives you 50 million queries per month and we use that up in a week. So my question is, are there any self hosted DNS we can do that provides the failover like how dnsme does it?

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• multiple vlans routed on one nic? trunk?General? or Access?

  - by Aceth

  ok for the last week I've tried racking my head around this... I have a SRW208P with 802.1q support, and a virtual endian appliance. I would like to be able to have 3 vlans having everything routed through the endian appliance.. i.e. The Virtual server has 2 bridged NIC's to the switch. This is where I'm getting confused .. On the 8 port switch I've got the 3 vlans set up ok (all being untagged as they are not going to be vlan aware), it's the port I'm connecting the endian firewall to the switch I'm having trouble with (second nic goes to the adsl modem and NAT'd) Is it meant to be a trunk, "Genereal" or "Access" then untagged or tagged? the end goal is to have vlan traffic routing through the single NIC and have endian route vlan traffic according to the rules. Any one have any ideas on the cisco small business stuff? Thanks

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• Android software for the system administrator on the move

  - by GruffTech

  My company has over service through Verizon, and AT&T Service in the area is "shoddy" at its best, so I haven't been able to join the "iPhone party" like so many of my fellow system administrators have been able to. That being said, this week finally a phone I like has hit Verizon, the HTC Incredible. (I've been waiting for the Desire or Nexus One, but after seeing spec sheets and reviews, HTC Incredible comes out ahead anyway). So (finally) I'm looking for Android Apps that are "gotta-haves" for system administrators. I've found the bottom three. If there are others you prefer over these let me know. RDP Program - RemoteRDP SSH Client - ConnectBot Nagios - NagMonDroid Reply with your favorite Android App and why!

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• jquery google visual api graph's data rows does not work.

  - by marharépa

  Hi! I'd like to use google drawVisualization API. Example: var data = new google.visualization.DataTable(); data.addColumn('string'); data.addColumn('number'); data.addRows([ ['a', 14], ['b', 47], ['c', 80], ['d', 55], ['e', 16], ['f', 90], ['g', 29], ['h', 23], ['i', 58], ['j', 48] ]); My version gets elements by an other google api, and join them, and after place the variable between ([ and ]), to be like in the example. var outputGraph = []; for (var i = 0, entry; entry = entries[i]; ++i) { var asd = [ entry.getValueOf('ga:pageTitle'), entry.getValueOf('ga:pageviews') ].join("',"); outputGraph.push(" ['" + asd + "]"); //get the 2 elements and join them to be like ['asd', 2], } // this is fine, the outputgraph is like ['asd', 2], ['asd', 2], ['asd', 2] as seen in the example var outputGraphFine = ("(["+outputGraph+"])"); // i suggest this is which fails the script. var data = new google.visualization.DataTable(); data.addColumn('string', 'Task'); data.addColumn('number', 'Hours per Day'); data.addRows = outputGraphFine; But it doesn't work. Why?

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• Acceessing some aggregate functions in a linq datasource in a GridView

  - by Stephen Pellicer

  I am working on a traditional WebForms project. In the project I am trying out some Linq datasources with plans to eventually migrate to an MVC architecture. I am still very new to Linq. I have a GridView using a Linq datasource. The entities I am showing has a to many relationship and I would like to get the maximum value of a column in the many side of the relationship. I can show properties of the base entity in the gridview: <asp:TemplateField HeaderText="Number" SortExpression="tJobBase.tJob.JobNumber"> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Bind("tJobBase.tJob.JobNumber") %>'> </asp:Label> </ItemTemplate> </asp:TemplateField> I can also show the count of the many related property: <asp:TemplateField HeaderText="Number" SortExpression="tJobBase.tJob.tHourlies.Count"> <ItemTemplate> <asp:Label ID="Label1" runat="server" Text='<%# Bind("tJobBase.tJob.tHourlies.Count") %>'> </asp:Label> </ItemTemplate> </asp:TemplateField> Is there a way to get the max value of a column called WeekEnding in the tHourlies collection to show in the GridView?

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• Facebook like button issue.

  - by Ross Hale

  Hello community, We're having some trouble getting our like button to work. It seemed to work last week but suddenly it's stopped working. Basically when clicking "Like", we get an error saying: You failed to provide a valid list of administators. You need to supply the administors using either a "fb:app_id" meta tag, or using a "fb:admins" meta tag to specify a comma-delimited list of Facebook users. Our section looks like this: <html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml" xml:lang="en" lang="en"> <head> <meta property="fb:app_id" content="number"/> <meta property="fb:admins" content="number"/> <meta property="og:title" content="title"/> <meta property="og:type" content="website"/> <meta property="og:url" content="url with trailing slash"/> <meta property="og:image" content="url to image"/> <meta property="og:site_name" content="Site Name"/> </head> Help?

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• VMware vSphere 4.1: host performance graphs show "No data available", except the realtime view, which works fine

  - by Graeme Donaldson

  Here's our scenario: Site 1 has 3 hosts, and our vCenter server is here. Site 2 has 3 hosts. All hosts are ESXi 4.1 update 1. If I view the Performance tab for any host in Site 1, I can view realtime, 1 Day, etc., i.e. all the views give me graph data. For the hosts in Site 2, I can view the realtime graphs, 1 Day and 1 Week both say "No data available". 1 Month had mostly nothing, 1 Year shows that it was working fine for a long time and then started breaking. 1 Month view: 1 Year view: What would cause this loss of performance data?

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• How do I programmatically insert rows into a Silverlight DataGrid without binding?

  - by j0rd4n

  I am using a common Silverlight DataGrid to display results from a search. The "schema" of the search can vary from query to query. To accommodate this, I am trying to dynamically populate the DataGrid. I can set explicitly set the columns, but I am having trouble setting the ItemSource. All of the MSDN examples set the ItemSource to a collection with a strong type (e.g. a Custom type with public properties matching the schema). The DataGrid then uses reflection to scour the strong type for public properties that will match the columns. Since my search results are dynamic, I cannot create a strong type to represent what comes back. Can I not just give the DataGrid an arbitrary list of objects so long as the number of objects in each list matches the number of columns? Anyone know if this is possible? I would like to do something similar to this: List<List<object>> myResults = <voodoo that populates the result list> myDataGrid.ItemsSource = myResults;

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• Outlook 2010: How do I mark one recurring event public?

  - by goober

  My office utilizes Outlook 2010 and Exchange for e-mail, and our calendars show free/busy information by default. Background I work from home once a week, so I have created an event that lists me as tentative for the entire workday, titled "Working from Home - Available Remotely". However, those attempting to schedule a meeting with me won't see this title, and therefore won't think they can schedule an event. As much as I'd like to get out meetings (!) it's important that folks be able to schedule with me. Question Is there a way to make the title/details public for this one recurring event so that when others attempt to schedule a meeting with me, Attempted Solutions I've tried creating a public calendar and sharing all the details of that calendar. However, all of my calendars are not included when someone wants to schedule with me, and so I'm shown as free unless someone specifically looks at my public calendar. I've Googled around, to no avail.

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• bind event handler on keydown listen function JavaScript jQuery

  - by user1644123

  I am trying to bind a handler to an event. The event is a keydown function. The handler will listen for hit variables to produce one of two conditions. The 1st condition (odd number of hits) will perform 1 function, the 2nd (even number of hits) will perform another function. To elaborate, the 1st function will scroll to one element, the 2nd will scroll to another element. My syntax may be the wrong approach, but it works for the 1st condition, but not the 2nd. I think I have the conditional statement in the wrong place. How can I rewrite this to work as intended? Thank you kindly, in advance! $(document).keydown(function(e) { switch (e.which) { case 37: break; case 38: break; case 39: break; case 40: //bottom arrow key var hits = 0; if (hits % 2 !== 0) { $('#wrap').animate({ scrollTop: $("#scrollToHere").offset().top }, 2800); } else { $('#wrap').animate({ scrollTop: $("#scroll2ToHere").offset().top }, 2800); } hits++; return false; break; } })? *I moved "var hits = 0;" to the top, but it only works! But is there a way I can reset the whole thing after every two hits? I want to reset because when there is a bug and if I press a 3rd time it scrolls to the very top of the page, where there is no element to make it scroll to the top. Why would it scroll to the top of the page if I never scripted it to do so?? *

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• Count bits used in int

  - by sigvardsen

  If you have the binary number 10110 how can I get it to return 5? e.g a number that tells how many bits are used? There are some likewise examples listed below: 101 should return 3 000000011 should return 2 11100 should return 5 101010101 should return 9 How can this be obtained the easiest way in Java? I have come up with the following method but can i be done faster: public static int getBitLength(int value) { int l = 1; if (value >> 16 > 0) { value = value >> 16; l += 16; } if (value >> 8 > 0) { value = value >> 8; l += 8; } if (value >> 4 > 0) { value = value >> 4; l += 4; } if (value >> 2 > 0) { value = value >> 2; l += 2; } if (value >> 1 > 0) { value = value >> 1; l += 1; } return l; }

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• firefox addons and their silly news tabs

  - by jettero

  Something like 30% of the addons I have in firefox update every other week and feel the need to pop open a tab about how awesome they are and all the cool things they changed. I just don't care at all and I'm very annoyed by these news tabs. When firefox opens, I want to see my home page. I've been looking for an addon to disable or kill them before I even have to look at them. Rather like addblock-for-addons. Short of finding a plugin that disables them, I'm seeking information about common interfaces so I can try to figure it out on my own. I'm wondering if I could do it in greasemonkey somehow. For example, is there something common about the url for the tabs?

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• 'DNS server isn't responding' error in windows 7 home premium

  - by pradeeptp

  Hi All, I bought a brand new Dell Studio 1558 just last week. It has windows 7 home premium 64-bit installed on it. My friend who is occupying the adjacent room has a laptop with windows XP. Both of us are connecting to the same wireless router of the hotel. My friend is able to connect to the wireless network without any trouble, but when I try to connect, I get the error "DNS service isn't responding". I get this error when I run the troubleshooting option. I met two more people in the same hotel with win XP laptop and they too dont have any problem. I have gone to possibly all the forums and website but I haven't been able to fix this error :(. I have done all the basic troubleshooting but I have no luck yet. Pls help. Following is one forum where the problem seem to have been trouble shooted but not for all. http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/eeb84518-903d-46d1-9398-80cf211878d7

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• div stacking/layout with css or javascript

  - by liz

  so i have 4 divs (i actually have many more but this will simplify the question). i want to display them in two columns. the 4 divs vary in height. the number of actual divs in the end will vary. so if i have this <div id="1" style="height: 200px" class="inline">some content here</div> <div id="2" style="height: 600px" class="inline">some content here</div> <div id="3" style="height: 300px" class="inline">some content here</div> <div id="4" style="height: 200px" class="inline">some content here</div> with styling thus .inline { display: inline-block; vertical-align: top; width: 48%;} so #1 would go left and then #2 would shove up beside it to the right, great, but the #3 will not slide up the 400px to fit nicely below #1. (of course)... it goes on the left side but at 600px from the top clearing the bottom of #2. etc... how would i get the divs to slide up into the empty spaces, is it possible with css? jquery maybe? i know i could write column divs to mark it up, but since the number of divs constantly change and the heights vary according to content. It would be nice to just get rid of the space since we dont really care about the order. any thoughts?

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• f12 and ctrl + f5 not working correctly

  - by ComatoseDuck

  When I came back to my work computer after being away for a week I found out when I try to clear the cache and refresh the page via ctrl + f5 (or just f5) I get the prompt "Type the Internet address of a document, and Internet Explorer will open it for you" with a drop down list in IE. When I try f5 in Chrome and FF it opens the "Open file" dialog box. When I try to f12 for Dev tools in IE, Chrome & FF it opens up the print dialog box. Why is this happening and what can I do to revert it back to the way it was?

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• ganglia graphs like munin for cpu, etc?

  - by CarpeNoctem

  I'm coming from munin and a CPU graph contains data for system, user, nice, etc ALL on one graph. I just installed ganglia and setup the basic monitoring. It appears that each type of cpu data is a separate graph! WTF is this and can I change the defaults to combine these into a single per host? That is my question, how do I combine cpu data into a single graph. Also, can I change the layout to something closer to munin's day-week side-by-side layout? I'm trying to be impartial and give ganglia a chance. ;)

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