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Full Discussion: Sed to replace second number in a random string
Top Forums UNIX for Dummies Questions & Answers Sed to replace second number in a random string Post 302383174 by Franklin52 on Monday 28th of December 2009 04:51:38 PM
Old 12-28-2009
Quote:
Originally Posted by glev2005
Franklin, it seems to mostly work, could you please explain it a little?
Explanation:
Code:
sed 's/\(.*STDM.\).\(.*\)/\16\2/'

With sed you can save substrings with \(.*\) and recall them back with \1, \2, \3 etc.

\(.*STDM.\).\(.*\)

The 1st portion \(.*STDM.\) is from the start of the line till the character after STDM (hence the dot)
The 2st portion .\(.*\) is from one character after the 1st portion (hence the dot before the substring) till the end of the line

\16\2

\1 -> print the 1st portion
6 -> print a "6"
\2 -> print the 2nd portion
 

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LEARN ABOUT CENTOS

slarnv.f

slarnv.f(3)							      LAPACK							       slarnv.f(3)

NAME

       slarnv.f -

SYNOPSIS

   Functions/Subroutines
       subroutine slarnv (IDIST, ISEED, N, X)
	   SLARNV returns a vector of random numbers from a uniform or normal distribution.

Function/Subroutine Documentation
   subroutine slarnv (integerIDIST, integer, dimension( 4 )ISEED, integerN, real, dimension( * )X)
       SLARNV returns a vector of random numbers from a uniform or normal distribution.

       Purpose:

	    SLARNV returns a vector of n random real numbers from a uniform or
	    normal distribution.

       Parameters:
	   IDIST

		     IDIST is INTEGER
		     Specifies the distribution of the random numbers:
		     = 1:  uniform (0,1)
		     = 2:  uniform (-1,1)
		     = 3:  normal (0,1)

	   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 REAL array, dimension (N)
		     The generated random numbers.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Further Details:

	     This routine calls the auxiliary routine SLARUV 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 98 of file slarnv.f.

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

Version 3.4.2							  Tue Sep 25 2012						       slarnv.f(3)
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