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  • Using a dynamic number of checkboxes in a rails form

    - by TenJack
    I am trying to create a form with a dynamic number of checkboxes that each link to a string that is not a model number but is instead just a word. For examples: <% form_for(@words) do |f| %> <% ["apple","banana","orange"].each do |word| %> <%= f.check_box :word %> <%= f.submit %> <% end %> <% end %> So, if "apple" was checked, it would just send the string "apple" in the params. Anyone know how to do this?

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  • Display a number on the screen

    - by Ni
    does anyone know how to display a number on the screen? I can load the data and create a x/y graph. Now instead of showing the graph, I load a data value from a text file, and I want to display that number on the screen. Does anyone know what function i can use? ....... NSString *data =[myText objectAtIndex:1]; ....... so now data = 1, i want to display the value of the 'data' which is 1 on the screen.

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  • Detect number of IDLE processors ruby

    - by Yannick Wurm
    Hello, I work on shared linux machines with between 4 and 24 cores. To make best use of them, I use the following code to detect the number of processors from my ruby scripts: return `cat /proc/cpuinfo | grep processor | wc -l`.to_i (perhaps there is a pure-ruby way of doing this?) But sometimes a colleague is using six or eight of the 24 cores. (as seen via top). How can I get an estimate of the number of currently unused processors that I can use without making anyone upset? Thanks!

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  • Program to find canonical cover or minimum number of functional dependencies

    - by Sev
    I would like to know if there is a program or algorithm to find canonical cover or minimum number of functional dependencies? For example: If you have: R = (A,B,C) <-- these are tables: A,B,C And dependencies: A ? BC B ? C A ? B AB ? C The canonical cover (or minimum number of dependencies) is: A ? B B ? C Is there a program that can accomplish this? If not, any code/pseudocode to help me write one would be appreciated. Prefer in Python or Java.

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  • Display a number on the screen Iphone SDK

    - by Ni
    does anyone know how to display a number on the screen/iphone simulator? I can load the data and create a x/y graph. Now instead of showing the graph, I load a data value from a text file, and I want to display that number on the screen. Does anyone know what function i can use? ....... NSString *data =[myText objectAtIndex:1]; ....... so now data = 1, i want to display the value of the 'data' which is 1 on the screen.

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  • Maximum number of workable tables in SQL Server And MySQL

    - by Kibbee
    I know that in SQL Server, the maximum number of "objects" in a database is a little over 2 billion. Objects contains tables, views, stored procedures, indexes, among other things . I'm not at all worried about going beyond 2 billion objects. However, what I would like to know, is, does SQL Server suffer a performance hit from having a large number of tables. Does each table you add have a performance hit, or is there basically no difference (assuming constant amount of data). Does anybody have any experience working with databases with thousands of tables? I'm also wondering the same about MySQL.

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  • Continuous builds and Agile vs commit often

    - by Mark Underwood
    Hi All, I'm just doing some formal training in Agile at the moment and one question I have is about the value of Continuous Builds vs value of committing to the version control system often. My understanding with version control is that its better to commit often, because then you have history and the ability to go back to previous changes in a fine grained way. My understanding with Agile and continuous build is that its there to put pressure on the developers to always have working code. That to break the source tree is a taboo thing to do. Now i agree with both of these sentiments, but it occurs to be that sometimes these might be working against each other. You maybe in the middle of a largish code change and want to commit code to make sure you have history, but this will break the source tree. Anybody got any thoughts on this? Cheers Mark.

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  • How do programmers work together on a project?

    - by Laith J
    Hello, I've always programmed alone, I'm still a student so I never programmed with anyone else, I haven't even used a version control system before. I'm working on a project now that requires knowledge of how programmers work together on a piece of software in a company. How is the software compiled? Is it from the version control system? Is it by individual programmers? Is it periodic? Is it when someone decides to build or something? Are there any tests that are done to make sure it "works"? Anything will do. Thanks.

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  • HOW TO SElect line number in TextBox Multiline

    - by Alhambra Eidos
    Hi all, I have large text in System.Windows.Forms.TextBox control in my form (winforms), vs 2008. I want find a text, and select the line number where I've found that text. Sample, I have fat big text, and I find "ERROR en línea", and I want select the line number in textbox multiline. string textoLogDeFuenteSQL = @"SQL*Plus: Release 10.1.0.4.2 - Production on Mar Jun 1 14:35:43 2010 Copyright (c) 1982, 2005, Oracle. All rights reserved. ** MORE TEXT **** Conectado a: Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production With the Partitioning, Data Mining and Real Application Testing options WHERE LAVECODIGO = 'CO_PREANUL' * ERROR en línea 2: ORA-00904: ""LAVECODIGO"": identificador no v?lido INSERT INTO COM_CODIGOS * ERROR en línea 1: ORA-00001: restricción única (XACO.INX_COM_CODIGOS_PK) violada"; ** MORE TEXT **** Any sample code about it ? thanks in advanced,

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  • Encode complex number as RGB pixel and back

    - by Vi
    How is it better to encode a complex number into RGB pixel and vice versa? Probably (logarithm of) an absolute value goes to brightness and an argument goes to hue. Desaturated pixes should receive randomized argument in reverse transformation. Something like: 0 - (0,0,0) 1 - (255,0,0) -1 - (0,255,255) 0.5 - (128,0,0) i - (255,255,0) -i - (255,0,255) (0,0,0) - 0 (255,255,255) - e^(i * random) (128,128,128) - 0.5 * e^(i *random) (0,128,128) - -0.5 Are there ready-made formulas for that? Edit: Looks like I just need to convert RGB to HSB and back. Edit 2: Existing RGB - HSV converter fragment: if (hsv.sat == 0) { hsv.hue = 0; // ! return hsv; } I don't want 0. I want random. And not just if hsv.sat==0, but if it is lower that it should be ("should be" means maximum saturation, saturation that is after transformation from complex number).

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  • assembly language programming (prime number)

    - by chris
    Prompt the user for a positive three digit number, then read it. Let's call it N. Divide into N all integer values from 2 to (N/2)+1 and test to see if the division was even, in which case N is instantly shown to be non-prime. Output a message printing N and saying that it is not prime. If none of those integer values divide evenly (remainder never is zero), then N is shown to be prime. Output a message printing N and saying that it is prime. Ask the user if he or she wants to test another number; if the user types "n" or "N", quit. If "y" or "Y", jump back and repeat. Comments in your code are essential. Hi. I am kinda in rush to do this.. please help me doing it. I'll be much appreciated. thank you

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  • android get contact phone number

    - by ng93
    hi, im trying to get a contacts name and phone number from the contacts list. im using: contactname = Curser.getString(Curser.getColumnIndex(Contacts.DISPLAY_NAME)); to get their name and it works fine. But using: contactphone = Curser.getString(Curser.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)); causes no warnings or errors and builds fine, yet force closes in both the emulator (2.1) and my htc desire (nexus one 2.2 rom/htc desire 2.1 rom). Any ideas how to fix it? oh and contactname and contactphone are both strings thanks, ng93

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  • Querying current number of touches on screen without using events on iPhone

    - by nikhil
    I have an application that starts playing a sound when user touches the uiview and changing to different tones as the user slides the finger on the screen. The sound stops when the user lifts the finger. I am using the touchesBegan, Moved and Ended Events for this. My problem is touches Ended (and/or cancelled) is sometimes not fired properly and the sound keeps playing even after the finger is lifted from screen. So as a workaround I would like to implement a timer that would check for the number of touches on the screen and if it is zero it will check and stop the audioplayer if playing. I have been searching for some code that could get me the number of touches like UITouch *touches=[self getAllTouchesonScreen]; or something :)

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  • IPHONE - number of row being shown

    - by Mike
    I have a table inside a UIImageView. The table occupies the entire UIImageView. The table contains a series of images. Scroll and paging are enabled. As the table size is the same of its parent view, I can see just one cell of the table at a time. When I roll the table, I see the next or previous cell. I have a variable that must contain the number of the row being shown, but how can I make this table update the variable. I can see that I can use the didSelectRowAtIndexPath to change the variable when the cell is selected, but this is not the case. I need to update the variable when the table is rolled. I want to do the same thing I could do using a UISCrollView and scrollViewDidScroll:, but even if this is possible, I would have to know the number of the row that is visible. How can I do that? thanks.

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  • Python - Number of Significant Digits in results of division

    - by russ
    Newbie here. I have the following code: myADC = 128 maxVoltage = 5.0 maxADC = 255.0 VoltsPerADC = maxVoltage/maxADC myVolts = myADC * VoltsPerADC print "myADC = {0: >3}".format(myADC) print "VoltsPerADC = {0: >7}".format(VoltsPerADC) print VoltsPerADC print "myVolts = {0: >7}".format(myVolts) print myVolts This outputs the following: myADC = 128 VoltsPerADC = 0.0196078 0.0196078431373 myVolts = 2.5098 2.50980392157 I have been searching for an explanation of how the number of significant digits is determined by default, but have had trouble locating an explanation that makes sense to me. This link link text suggests that by default the "print" statement prints numbers to 10 significant figures, but that does not seem to be the case in my results. How are the number of significant digits/precision determined? Can someone shed some light on this for me. Thanks in advance for your time and patience.

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  • Managing Team Development on Shared Website

    - by stjowa
    I need to know the best way to manage team web-development on a shared server (hostgator). I have done some individual web development on a shared server in the past, and I have always setup SVN through SSH to have a pretty-nice development workflow (version control, quick-commits, work though eclipse/subclipse, etc). However, I also know that with that setup, I had to make some pretty-sophisticated post-commit hooks to export the repository to /public_html; and, therefore, making the repository code testable. This seems like a tedious and error-prone setup for an entire team. I would like to be able to: Easily test the latest code in the repository. Somewhat easily move the code in the repository to production. Use an IDE like eclipse/subclipse to easily work with the repository. With this in mind, does anyone know of a good version-control/repository setup for developing a website with a team of about 4-5 people? Thanks a lot.

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  • Batch files - number of command line arguments

    - by pyko
    Just converting some shell scripts into batch files and there is one thing I can't seem to find...and that is a simple count of the number of command line arguments. eg. if you have: myapp foo bar In Shell: $# - 2 $* - foo bar $0 - myapp $1 - foo $2 - bar In batch ?? - 2 <---- what command?! %* - foo bar %0 - myapp %1 - foo %2 - bar So I've looked around, and either I'm looking in the wrong spot or I'm blind, but I can't seem to find a way to get a count of number of command line arguments passed in. Is there a command similar to shell's "$#" for batch files? ps. the closest i've found is to iterate through the %1s and use 'shift', but I need to refernece %1,%2 etc later in the script so that's no good.

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  • Casting a primitive int to a Number

    - by Tamer
    Let's say that I have the following: int a = 2; Number b = (Number) a; System.out.println(b); // Prints 2 http://java.sun.com/docs/books/jls/first_edition/html/15.doc.html#238146 says that a primitive value may not be cast to a reference type. Does Java know to create an Integer from the primitive int and then cast to the superclass? How exactly does Java handle this behind the scenes? Thanks!

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  • Isn't the C++ standard library backward-compatible?

    - by Chris Metzler
    Hi. I'm working on a 64-bit Linux system, trying to build some code that depends on third-party libraries for which I have binaries. During linking, I get a stream of undefined reference errors for one of the libraries, indicating that the linker couldn't resolve references to standard C++ functions/classes, e.g.: librxio.a(EphReader.o): In function `gpstk::EphReader::read_fic_data(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': EphReader.cpp:(.text+0x27c): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)' EphReader.cpp:(.text+0x4e8): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)' I'm not really a C++ programmer, but this looks to me like it can't find the standard library. Doing some more research, I got the following when I looked at librxio's dependency for the standard library: $ ldd librxio.so.16.0 ./librxio.so.16.0: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found (required by ./librxio.so.16.0) libm.so.6 => /lib64/libm.so.6 (0x00002aaaaad45000) libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002aaaaafc8000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002aaaab2c8000) libc.so.6 => /lib64/libc.so.6 (0x00002aaaab4d7000) /lib64/ld-linux-x86-64.so.2 (0x0000555555554000) So I read that as saying that librxio (one of the third-party libraries) requires at least v3.4.9 of the standard library. But the version I have installed is 4.1.2: $ rpm -qa | grep libstdc compat-libstdc++-33-3.2.3-61.x86_64 libstdc++-devel-4.1.2-14.el5.i386 libstdc++-devel-4.1.2-14.el5.x86_64 libstdc++-4.1.2-14.el5.x86_64 libstdc++-4.1.2-14.el5.i386 Shouldn't this work? The shared object major number is 6, same as for v3.4.9. At this level, shouldn't this be backward compatible? It seems like the third-party library is looking for an earlier version of the standard library than what I have installed; but isn't there backward compatibility between versions with the same major number for the shared library? Again, I'm not really a C++ programmer; but I don't see what the problem is. Any advice greatly appreciated. Thanks.

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  • BULK INSERT with inconsitant number of columns

    - by aceinthehole
    I am trying to load a large amount data in SQL server from a flat file using BULK INSERT. However, my file has varying number of column, for instance the first row contains 14 and the second contains 4. That is OK, I just want to make a table with the max number of columns and load the file into it with nulls for the missing columns. I can play with it from that point. But it seems that SQL Server when reaching the end of the line and having more columns to fill for that same row in the destination table, just moves on to the next line and attempts to put the data on that line to the wrong column of the table. Is there a way to get the behavior that I am looking for? Is there a table hint that I can use the specify this? Has anyone run into this before? Here is the code BULK INSERT #t FROM '<path to file>' WITH ( DATAFILETYPE = 'char', KEEPNULLS, FIELDTERMINATOR = '#' )

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