Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Random selection of subset of sample from file Post 302737535 by elixir_sinari on Thursday 29th of November 2012 06:55:16 AM
Old 11-29-2012
Code:
awk -v hm=1224 -v ml=12240 'function randlines(howmany,maxlines,      a,i) {
 srand()
 for(i in arr) delete arr[i]
 i=1
 while(i<=howmany)
 {
  a=int(rand()*maxlines) + 1
  if(!(a in arr))
  {
   i++
   arr[a]
  }
 }
}
BEGIN{
randlines(hm,ml)
}
NR in arr' file


Last edited by elixir_sinari; 11-29-2012 at 08:49 AM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Total file size of a subset list

Hello! I'm trying to find out the total file size of a subset list in a directory. For example, I do not need to know the total file size of all the files in a directory, but I need to know what the total size is of say, "ls -l *FEB08*" in a directory. Is there any easy way of doing this? ... (3 Replies)
Discussion started by: tekster757
3 Replies

2. Shell Programming and Scripting

Random lines selection form a file.

>cat data.dat 0001 Robbert 0002 Nick 0003 Mark ....... 1000 Jarek (3 Replies)
Discussion started by: McLan
3 Replies

3. Shell Programming and Scripting

Count the number of words in some subset of file and disregard others

Hi All, I have some 6000 text files in a directory. My files are named like 1.txt, 2.txt 3.txt and so on until 6000.txt. I want to count the "number of words" in only first 3000 of them. Any suggestions? I know wc -w can count the number of words in a text file. I am using Red Hat Linux. (3 Replies)
Discussion started by: shoaibjameel123
3 Replies

4. Shell Programming and Scripting

Random File Selection and Moving

OK, I am stumpped. I have this shell Script that I want to randomly select a file with the extention of .sct. Then using a portion of its file name select the six related .mot files. Then move them all to another folder. I also need a user input form for the number of .SCT files to randomly select... (6 Replies)
Discussion started by: stak1993
6 Replies

5. UNIX for Dummies Questions & Answers

how to get a subset of such a file

Dear all, I have a file lik below: n of row=420, n of letters in each row=100000 like below: there is no space between the letters. what I want is: the 75000th letter to the 85000th letter in each row. how to do that? thanks a lot! ... (2 Replies)
Discussion started by: forevertl
2 Replies

6. UNIX for Dummies Questions & Answers

Swapping the columns of a text file for a subset of rows

Hi, I'd like to swap the columns 1 and 2 of a space-delimited text file but only for the first 1000 rows. How do I go about doing that? Thanks! (1 Reply)
Discussion started by: evelibertine
1 Replies

7. Shell Programming and Scripting

Creating subset of a file based on specific columns

Hello Unix experts, I need a help to create a subset file. I know with cut comand, its very easy to select many different columns, or threshold. But here I have a bit problem as in my data file is big. And I don't want to identify the column numbers or names manually. I am trying to find any... (7 Replies)
Discussion started by: smitra
7 Replies

8. Shell Programming and Scripting

Need to generate a file with random data. /dev/[u]random doesn't exist.

Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom. I create a named pipe then: dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024 but when I cat a file to the fifo that's 1024 random bytes: cat randomfile.txt >... (7 Replies)
Discussion started by: Devyn
7 Replies

9. UNIX for Advanced & Expert Users

How to extract subset file from dataset?

Hello I have a data set which looks like this : progeny sire dam gender 12 1 3 M 13 2 4 F 14 2 5 F 15 6 5 ... (13 Replies)
Discussion started by: sajmar
13 Replies

10. Shell Programming and Scripting

awk to filter file using another working on smaller subset

In the below awk if I use the attached file as the input, I get no results for TCF4. However, if I just copy that line from the attached file and use that as input I get results for TCF4. Basically the gene file is a 1 column list that is used to filter $8 of the attached file. When there is a... (9 Replies)
Discussion started by: cmccabe
9 Replies
GET_DEFINED_FUNCTIONS(3)						 1						  GET_DEFINED_FUNCTIONS(3)

get_defined_functions - Returns an array of all defined functions

SYNOPSIS
array get_defined_functions (void ) DESCRIPTION
Gets an array of all defined functions. RETURN VALUES
Returns a multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal func- tions will be accessible via $arr["internal"], and the user defined ones using $arr["user"] (see example below). EXAMPLES
Example #1 get_defined_functions(3) example <?php function myrow($id, $data) { return "<tr><th>$id</th><td>$data</td></tr> "; } $arr = get_defined_functions(); print_r($arr); ?> The above example will output something similar to: Array ( [internal] => Array ( [0] => zend_version [1] => func_num_args [2] => func_get_arg [3] => func_get_args [4] => strlen [5] => strcmp [6] => strncmp ... [750] => bcscale [751] => bccomp ) [user] => Array ( [0] => myrow ) ) SEE ALSO
function_exists(3), get_defined_vars(3), get_defined_constants(3), get_declared_classes(3). PHP Documentation Group GET_DEFINED_FUNCTIONS(3)
All times are GMT -4. The time now is 08:36 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy