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  • Recursive languages vs context-sensitive languages

    - by teehoo
    In Chomsky's hierarchy, the set of recursive languages is not defined. I know that recursive languages are a subset of recursively enumerable languages and that all recursive languages are decidable. What I'm curious about is how recursive languages compare to context-sensitive languages. Can I assume that context-sensitive languages are a strict subset of recursive languages, and therefore all context-sensitive languages are decidable?

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  • Validate a long type input

    - by Santiago
    I'm trying to validate that a user only enters a long value as input (long bigger than 0 actually). Compare and Range validator has DataTypeCheck for int values only. I was planning on using this class in a CustomValidator but then I would need to write both, client and server side validation code. Do you know of any other good way of doing this? Thanks!

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  • grep a specific word and sum it

    - by Kimi
    I want to grep an environment variable env | grep ABC_IJK[1,2] currenlty defined variables are like this ABC_IJK1=123 ABC_IJK1_XYZ=sn123:345 ABC_IJK2=999 ABC_IJK2_XYZ=sn321:999 I only want to get only this ABC_IJK1=123 ABC_IJK2=999 get number of connections sum them(not 123 + 999) and save in N1 (this one has 2 connection) so N1=2 get number of connections sum them and save in N2 for other machine (if this have four) so N2=4 If the value is not there or the variable is not present then N1=1 for below: ABC_IJK1= ABC_IJK2=123 Then need to compare it with a MAX_CONNECTION variable Thanks

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  • Data Processing in Business Intelligence Applications

    - by Manoj
    Is data processing a part of business intelligence tools? If no how else is it done or if yes can you give a few examples. My use case: I am using pentaho reporting to generate tables and graphs of my test data. Now I want to compare the data against the spec and see if it passes or fails and report the same. The spec is also in the database. How best to do it?

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  • Get text from listview onclick (Android)

    - by dweebsonduty
    I am creating lists in my android app and would like to capture the text of the list item that is clicked but I want to do it in a seperate function so I only have to write the code once. And I want to be able to compare the string to another sting. What is the best way to do this?

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  • Benchmarking a particular method in Objective-C

    - by Jasconius
    I have a critical method in an Objective-C application that I need to optimize as much as possible. I first need to take some easy benchmarks on this one single method so I can compare my progress as I optimize. What is the easiest way to track the execution time of a given method in, say, milliseconds, and print that to console.

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  • longest string in texts

    - by davit-datuashvili
    ok i have meet following problem too for example there is given two text find longest string that occur in both i think we should cretate string array where we should put common srings and then compare their length and which length will be largest print it is there fast method?

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  • After writing SQL statements in MySQL, how to measure the speed / performance of them?

    - by Jian Lin
    I saw something from an "execution plan" article: 10 rows fetched in 0.0003s (0.7344s) How come there are 2 durations shown? What if I don't have large data set yet. For example, if I have only 20, 50, or even just 100 records, I can't really measure how faster 2 different SQL statements compare in term of speed in real life situation? In other words, there needs to be at least hundreds of thousands of records, or even a million records to accurately compares the performance of 2 different SQL statements?

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  • Cost of exception handlers in Python

    - by Thilo
    In another question, the accepted answer suggested replacing a (very cheap) if statement in Python code with a try/except block to improve performance. Coding style issues aside, and assuming that the exception is never triggered, how much difference does it make (performance-wise) to have an exception handler, versus not having one, versus having a compare-to-zero if-statement?

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  • PHP and jquery restrict direct access

    - by Sergio
    Is it possible to restrict direct access to PHP file if I use jquery .load function like this one: $(document).ready(function(){ $("#second").load("testip.php"); }); In this case I want to restrict direct access to file testip.php that will instert data in database. Can I do it using some PHP function that will compare visitors IP address and server IP at "testip.php" file or there is some better way to do it?

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  • getAudioInputStream can not convert [stereo, 4 bytes/frame] stream to [mono, 2 bytes/frame]

    - by brian_d
    Hello. I am using javasound and have an AudioInputStream of format PCM_SIGNED 8000.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian Using AudioSystem.getAudioInputStream(target_format, original_stream) produces an 'IllegalArgumentException: Unsupported Conversion' when the target_format is PCM_SIGNED 8000.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian Is it possible to convert this stream manually after every read() call? And if yes, how? In general, how can you compare two formats and tell if a conversion is possible?

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  • C# what does the == operator do in detail?

    - by clamp
    in c# what does exactly happen in the background when you do a comparison with the "==" operator on two objects? does it just compare the addresses? or does it something like Equals() or CompareTo() ? PS: what about the "==" operator in java? does it behave the same?

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  • reading from File in assembly

    - by Natasha
    i am trying to read a username and a password from a file in x86 assembly for the perpose of authentication obviously the file consists of two lines , the user name and the password how can i read the two lines seperately and compare them? My attempt: proc read_file mov ah,3dh lea dx,file_name int 21h mov bx, ax xor si,si repeat: mov ah, 3fh lea dx, buffer mov cx, 100 int 21h mov si, ax mov buffer[si], '$' mov ah, 09h int 21h ;print on screen cmp si, 100 je repeat jmp stop;jump to end stop: RET read_file ENDP

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  • A good Design-by-Contract library for Java?

    - by Chris Jones
    A few years ago, I did a survey of DbC packages for Java, and I wasn't wholly satisfied with any of them. Unfortunately I didn't keep good notes on my findings, and I assume things have changed. Would anybody care to compare and contrast different DbC packages for Java?

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  • CSharp: Testing a Generic Class

    - by Jonas Gorauskas
    More than a question, per se, this is an attempt to compare notes with other people. I wrote a generic History class that emulates the functionality of a browser's history. I am trying to wrap my head around how far to go when writing unit tests for it. I am using NUnit. Please share your testing approaches below. The full code for the History class is here (http://pastebin.com/ZGKK2V84).

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  • Best graphical source code diff viewer/editor for code comparison and merging?

    - by Assaf Lavie
    The options for source code diff viewing/editing/merging seem to be: Free: Tortoise Merge Meld * WinDiff WinMerge * DiffMerge * KDiff AJC Diff Commercial: Total Commander's Diff viewer * Beyond Compare * Delta Walker * Araxis Merge * Are there any other options? (Wikipedia suggests a few) What's your favorite tools for source code diff? And how does it differ from the ones in the list? * Supports directory diffs

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  • String comparison in Objective-C

    - by james.ingham
    Hey, I've currently got a webserver set up which I communicate over SOAP with my iPhone app. I am returning a string containing a GUID and when I attempt to compare this with another string I get some strange results: Why would this not fire? Surely the two strings are a match? Thanks

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  • How do I pipe in FileMerge as a diff tool with git on OSX?

    - by doug
    I'm new to git, on OSX, using it via command line. I come from the world of Tortoise SVN and Beyond Compare on Windows. I want to be able to pipe in diffs to happen via FileMerge which I have installed already. I was able to do this with TextMate simply by using: git diff | mate But I'm not sure how to get that set up so I can use FileMerge instead?

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