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• writing to a dataframe from a for-loop in R

  - by CCID

  I'm trying to write from a loop to a data frame in R, for example a loop like this for (i in 1:20) { print(c(i+i,i*i,i/1))} and to write each line of 3 values to a data frame with three columns, so that each iteration takes on a new row. I've tried using matrix, with ncol=3 and filled by rows, but only get the last item from the loop. Thanks.

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• How to calculate the maximum block length in C of a binary number

  - by user1664272

  I want to reiterate the fact that I am not asking for direct code to my problem rather than wanting information on how to reach that solution. I asked a problem earlier about counting specific integers in binary code. Now I would like to ask how one comes about counting the maximum block length within binary code. I honestly just want to know where to get started and what exactly the question means by writing code to figure out the "Maximum block length" of an inputted integers binary representation. Ex: Input 456 Output: 111001000 Number of 1's: 4 Maximum Block Length: ? Here is my code so far for reference if you need to see where I'm coming from. #include <stdio.h> int main(void) { int integer; // number to be entered by user int i, b, n; unsigned int ones; printf("Please type in a decimal integer\n"); // prompt fflush(stdout); scanf("%d", &integer); // read an integer if(integer < 0) { printf("Input value is negative!"); // if integer is less than fflush(stdout); return; // zero, print statement } else{ printf("Binary Representation:\n", integer); fflush(stdout);} //if integer is greater than zero, print statement for(i = 31; i >= 0; --i) //code to convert inputted integer to binary form { b = integer >> i; if(b&1){ printf("1"); fflush(stdout); } else{ printf("0"); fflush(stdout); } } printf("\n"); fflush(stdout); ones = 0; //empty value to store how many 1's are in binary code while(integer) //while loop to count number of 1's within binary code { ++ones; integer &= integer - 1; } printf("Number of 1's in Binary Representation: %d\n", ones); // prints number fflush(stdout); //of ones in binary code printf("Maximum Block Length: \n"); fflush(stdout); printf("\n"); fflush(stdout); return 0; }//end function main

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• How do i set the max heap size in google app engine?

  - by LoudNPossiblyRight

  I just deployed my servlet on the app engine but when i print the max heap size i only get 104857600 which is less than is available by default on my local machine (512 megs). Is there a way to get google to change this? I looked at billing but there is no mention of memory usage.

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• interactive lua: command line arguments

  - by mr calendar

  I wish to do lua prog.lua arg1 arg2 from the command line Inside prog.lua, I want to say, for instance print (arg1, arg2, '\n') Lua doesn't seem to have argv[1] etc and the methods I've seen for dealing with command line arguments seem to be immature and / or cumbersome. Am I missing something?

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• count and fetch rows in php

  - by Mac Taylor

  hey guys i have a table in my mysql database named (names) now everyone can save their real names now i want to query this table and find out how many times these names used forexample the output should be : Jakob (20) Jenny (17) now this is my own code : list($usernames) =mysql_fetch_row(mysql_query('SELECT name FROM table_user GROUP BY name ORDER BY COUNT(name) DESC LIMIT 50 ')); list($c) =mysql_num_rows(mysql_query('SELECT COUNT(name) FROM table_user GROUP BY name ')); print $usernames.'('.$c.')' is this a correct approach ?!

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• Deterministic key serialization

  - by Mike Boers

  I'm writing a mapping class which uses SQLite as the storage backend. I am currently allowing only basestring keys but it would be nice if I could use a couple more types hopefully up to anything that is hashable (ie. same requirements as the builtin dict). To that end I would like to derive a deterministic serialization scheme. Ideally, I would like to know if any implementation/protocol combination of pickle is deterministic for hashable objects (e.g. can only use cPickle with protocol 0). I noticed that pickle and cPickle do not match: >>> import pickle >>> import cPickle >>> def dumps(x): ... print repr(pickle.dumps(x)) ... print repr(cPickle.dumps(x)) ... >>> dumps(1) 'I1\n.' 'I1\n.' >>> dumps('hello') "S'hello'\np0\n." "S'hello'\np1\n." >>> dumps((1, 2, 'hello')) "(I1\nI2\nS'hello'\np0\ntp1\n." "(I1\nI2\nS'hello'\np1\ntp2\n." Another option is to use repr to dump and ast.literal_eval to load. This would only be valid for builtin hashable types. I have written a function to determine if a given key would survive this process (it is rather conservative on the types it allows): def is_reprable_key(key): return type(key) in (int, str, unicode) or (type(key) == tuple and all( is_reprable_key(x) for x in key)) The question for this method is if repr itself is deterministic for the types that I have allowed here. I believe this would not survive the 2/3 version barrier due to the change in str/unicode literals. This also would not work for integers where 2**32 - 1 < x < 2**64 jumping between 32 and 64 bit platforms. Are there any other conditions (ie. do strings serialize differently under different conditions)? (If this all fails miserably then I can store the hash of the key along with the pickle of both the key and value, then iterate across rows that have a matching hash looking for one that unpickles to the expected key, but that really does complicate a few other things and I would rather not do it.) Any insights?

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• Exception Handling in google app engine

  - by Rahul99

  i am raising exception using if UserId == '' and Password == '': raise Exception.MyException , "wrong userId or password" but i want print the error message on same page class MyException(Exception): def __init__(self,msg): Exception.__init__(self,msg)

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• Error handling in the RequestHandler without embedding in URI

  - by hyn

  When a user sends a filled form, I want to print an error message in case there is an input error. One of the GAE sample codes does this by embedding the error message in the URI. Inside the form handler (get): self.redirect('/compose?error_message=%s' % message) and in the handler (get) of redirected URI, gets the message from request: values = { 'error_message': self.request.get('error_message'), ... Is there a way to accomplish the same without embedding the message in the URI?

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• Comparing an [NSURL path] to an NSString doesn't work

  - by Koning Baard XIV

  I have this code: NSLog([url path]); if([url path] == @"/connect/login_success.html") { NSLog("IT WORKZ"); } When I run my application, do the login etc... my console says: 2010-05-04 23:49:57.297 Framebook Test Application[8069:a0f] /connect/login_success.html But it should also print IT WORKZ to the console, which it does not. Can anyone help me? Thanks.

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• any faster alternative??

  - by kaushik

  I have to read a file from a particular line number and i know the line number say "n": i have been thinking of two choice: 1)for i in range(n) fname.readline() k=readline() print k 2)i=0 for line in fname: dictionary[i]=line i=i+1 but i want to know faster alternative as i might have to perform this on different files 20000 times. is there is any other better alternatives?? thanking u

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• Applescript - How to iterate over tracks

  - by Bob Rivers

  Hi, I'm a newbie in applescript. I was trying to learn it from various sources, such as Doug's site, macscripter and this forum Just for learning purposes, I was trying to print on the screen all the tracks names using this code: tell application "iTunes" set myTracks to (tracks of library playlist 1) repeat with aTrack in myTracks get name of aTrack end repeat end tell But it only prints one track name, probably the last one... So, how is the best way to iterate over a list? TIA, Bob

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• writing an Dynamic query in sqlserver

  - by prince23

  hi, DECLARE @sqlCommand varchar(1000) DECLARE @columnList varchar(75) DECLARE @city varchar(75) DECLARE @region varchar(75) SET @columnList = 'first_name, last_name, city' SET @city = '''London''' SET @region = '''South''' SET @sqlCommand = 'SELECT ' + @columnList + ' FROM dbo.employee WHERE City = ' + @city and 'region = '+@region --and 'region = '+@region print(@sqlCommand) EXEC (@sqlCommand) when i run this command i get an error Msg 156, Level 15, State 1, Line 8 Incorrect syntax near the keyword 'and'. and help would great thank you

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• Python - How to catch outside exceptions inside methods

  - by Gabriel L. Oliveira

  I want to know if there would be a way to catch exceptions inside called methods. Example: def foo(value): print value method(x) This would throw a NameError exception, cause x is not declared. I'd like to catch this NameError exception inside foo method. Is there a way?

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• cx_Oracle and output variables

  - by Tim

  I'm trying to do this again an Oracle 10 database: cursor = connection.cursor() lOutput = cursor.var(cx_Oracle.STRING) cursor.execute(""" BEGIN %(out)s := 'N'; END;""", {'out' : lOutput}) print lOutput.value but I'm getting DatabaseError: ORA-01036: illegal variable name/number Is it possible to define PL/SQL blocks in cx_Oracle this way?

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• Xcode C++ debugging

  - by mousebird

  I'm looking for a way to have the Xcode IDE pick up on the contents of my weird Boost template classes. Basically, classes complex enough that Xcode can't display their contents correctly. Is there something like the Objective C -description method or toString() in Java that Xcode will look for? At the moment I'm just implementing print() methods and invoking them in gdb, but that's likely to confuse other developers.

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• Getting the Assembly Qualified Name of a class in Visual Studio

  - by Alex Marshall

  Hello, I'm writing a customized reflective library for some specialized custom domain logic, and that library is going to use XML configuration files that will dynamically resolve System.Type objects at runtime. However, when writing the XML configuration files, it's a bit of a pain to write the types because they need to be fully qualified assembly names for Type.GetType() to resolve them. Is there a way to find out the AssemblyQualifiedName of an object in Visual Studio without resorting to writing a program to print them out to a file or standard out or anything like that ?

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• A PHP CMS to manage Files and privileges between users

  - by amirouche

  I'm looking for a PHP CMS which can let me to: 1-Uploade and manage files ( pdf, words..) between users by allowing to view, to print or to download. 2-Know who accessed what and when, who download what and when... who do what and when.

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• How do I list Clearcase versions without the Fully-qualified verison?

  - by Luciano

  In Clearcase: I'm trying to find the names of all files in the current view without a specific label. So far I've come up with the following: cleartool find -cview -all -version '\!lbtype(LABEL_1)' -print But this ends up displaying the filenames with the "@@/main/BRANCH1/SUBBRANCH" appended to the end, and I really want just the filename. I've tried adding a -short, but the find command doesn't like that option, and I can't find an option in the manuals to change the behavior.

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• How to ANSI-C cast from unisigned int * to char *?

  - by user314290

  I want these two print functions to do the same thing: unsigned int Arraye[] = {0xffff,0xefef,65,66,67,68,69,0}; char Arrage[] = {0xffff,0xefef,65,66,67,68,69,0}; printf("%s", (char*)(2+ Arraye)); printf("%s", (char*)(2+ Arrage)); where Array is an unsigned int. Normally, I would change the type but, the problem is that most of the array is numbers, although the particular section should be printed as ASCII.

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• How do I distinguish files and folders on an FTP server

  - by soulmerge

  I want to list all files on an FTP server using PHP. According to RFC 959 the FTP command LIST is allowed to print arbitrary human-readable information on files/folders, which seems to make it impossible to determine the file type correctly. But how do other FTP clients manage to distinguish files and folders? Is there an unwritten standard or such?

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• how to get list of databases that a user owns?

  - by chiggsy

  Id like to find out ( and delete ) all the databases owned by an owner in postgres 8.4.3 I'm new to postgres also, and although I can , and will , read the whole manual today i was forced to use for i in $(psql -l |grep novicedba | awk '{print $1}') psql -d postgres -c " drop database \"$i\"" out of desperation. What's the postgresql way to do this?

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• List DOM Documents attributes and methods using Javascript

  - by EddyR

  Just wondering if it's possible to print and list all methods and attributes available to the DOM document itself using Javascript? So I would get something like so: Document.doctype Document.implementation Document.documentElement Document.createElement Document.createDocumentFragment Document.createTextNode Document.createComment Document.createProcessingInstruction etc... etc... I want to do this to test on different browsers and not have to wade through mountains technical documents from each vendor to get accurate information.

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• create a dict of lists from a string

  - by Chris Card

  I want to convert a string such as 'a=b,a=c,a=d,b=e' into a dict of lists {'a': ['b', 'c', 'd'], 'b': ['e']} in Python 2.6. My current solution is this: def merge(d1, d2): for k, v in d2.items(): if k in d1: if type(d1[k]) != type(list()): d1[k] = list(d1[k]) d1[k].append(v) else: d1[k] = list(v) return d1 record = 'a=b,a=c,a=d,b=e' print reduce(merge, map(dict,[[x.split('=')] for x in record.split(',')])) which I'm sure is unnecessarily complicated. Any better solutions?

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• How can I make this Perl regex work?

  - by Geo

  I have this line ( it's a single line, SO makes it seem like 2 ): /Od /D "WIN32" /D "_DEBUG" /FD /EHa /MDd /Fo"Debug" /Fd"Debug\vc80.pdb" /W3 /c /Zi /clr /TP .\main.cpp" And I want to extract the .\main.cpp. I thought the following would do the trick: if($string =~ /.*\s+(.*)$/i) { print "matched ",$1,"\n"; } because this same regex works in Ruby, and extracts the string I required. How can I get it working?

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• java program to get the current date without timestamp

  - by Lakshman

  I need a java program to get the current date without timestamp Date d = new Date(); gives me date and timestamp But i need only date, without timestamp. I use this date to compare with another date object that does not have timestamp. on printing System.out.println("Current Date : " + d) of d it should print May 11 2010 - 00:00:00 .

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