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Full Discussion: How to insert random numbers into each line?
Top Forums Shell Programming and Scripting How to insert random numbers into each line? Post 302973917 by Don Cragun on Tuesday 24th of May 2016 02:43:32 AM
Old 05-24-2016
Quote:
Originally Posted by rovf
As Don said, your example does not match the specification you gave. Maybe you didn't mean "insert 3 random numbers", but "replace the spaces (at a certain position) by a 3-digit random number"?

---------- Post updated at 08:18 AM ---------- Previous update was at 08:09 AM ----------

You did not say, what shell you want to use. I give you an example solution in Zsh (which is pretty convenient when it comes to programming):

Say you process your file line by line, and have stored one line in variable
Code:
line

, i.e. line contains somthing like
Code:
4     44

(i.e. 5 spaces between the numbers), and you want to replace the middle three spaces by a random number. This could be done in Zsh by

Code:
echo ${line:s/    / $((RANDOM%1000))}

Note that there are 4 spaces between the pair of slashes, and exactly one space after the second slash. Hence, the expression substitutes the first four spaces in the line, by a single space followed by a 3-digit random number.
Except, of course, that you'll get a 1-digit random number about 10 times out of a thousand (replacing 4 spaces with 2 characters) and a 2-digit random number about 90 times out of a thousand (replacing 4 spaces with 3 characters).
 

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LEARN ABOUT DEBIAN

zlarnv

zlarnv.f(3)							      LAPACK							       zlarnv.f(3)

NAME

       zlarnv.f -

SYNOPSIS

   Functions/Subroutines
       subroutine zlarnv (IDIST, ISEED, N, X)
	   ZLARNV

Function/Subroutine Documentation
   subroutine zlarnv (integerIDIST, integer, dimension( 4 )ISEED, integerN, complex*16, dimension( * )X)
       ZLARNV

       Purpose:

	    ZLARNV returns a vector of n random complex numbers from a uniform or
	    normal distribution.

       Parameters:
	   IDIST

		     IDIST is INTEGER
		     Specifies the distribution of the random numbers:
		     = 1:  real and imaginary parts each uniform (0,1)
		     = 2:  real and imaginary parts each uniform (-1,1)
		     = 3:  real and imaginary parts each normal (0,1)
		     = 4:  uniformly distributed on the disc abs(z) < 1
		     = 5:  uniformly distributed on the circle abs(z) = 1

	   ISEED

		     ISEED is INTEGER array, dimension (4)
		     On entry, the seed of the random number generator; the array
		     elements must be between 0 and 4095, and ISEED(4) must be
		     odd.
		     On exit, the seed is updated.

	   N

		     N is INTEGER
		     The number of random numbers to be generated.

	   X

		     X is COMPLEX*16 array, dimension (N)
		     The generated random numbers.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

	     This routine calls the auxiliary routine DLARUV to generate random
	     real numbers from a uniform (0,1) distribution, in batches of up to
	     128 using vectorisable code. The Box-Muller method is used to
	     transform numbers from a uniform to a normal distribution.

       Definition at line 100 of file zlarnv.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						       zlarnv.f(3)
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