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Top Forums Shell Programming and Scripting How to select lines randomly without replacement in UNIX? Post 302981469 by shamrock on Tuesday 13th of September 2016 01:54:36 PM
Old 09-13-2016
Quote:
Originally Posted by sajmar
... In my case, I want to randomly choose 5000 lines out of 15000 lines. what should I do for this situation?
Try to come up with a smart hash function that'd let you choose a different set of lines in each iteration...
 

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PGASetRealInitPercent(2)					      PGAPack						  PGASetRealInitPercent(2)

NAME
PGASetRealInitPercent - sets the upper and lower bounds for randomly initializing real-valued genes. DESCRIPTION
For each gene these bounds define an interval from which the initial allele value is selected uniformly randomly. With this routine the user specifies a median value and a percent offset for each allele. INPUT PARAMETERS
ctx - context variable median - an array containing the mean value of the interval percent - an array containing the percent offset to add and subtract to the median to define the interval OUTPUT PARAMETERS
none SYNOPSIS
#include "pgapack.h" void PGASetRealInitPercent(ctx, median, percent) PGAContext *ctx double *median double *percent LOCATION
real.c EXAMPLE
Set the initialization routines to select a value for each real-valued gene i uniformly randomly from the interval [i-v,i+v], where $v = i/2$. Assumes all strings are the same length. PGAContext *ctx; double *median, *percent; int i, stringlen; : stringlen = PGAGetStringLength(ctx); median = (double *) malloc(stringlen*sizeof(double)); percent = (double *) malloc(stringlen*sizeof(double)); for(i=0;i<stringlen;i++) { median[i] = (double) i; percent[i] = 0.5; } PGASetRealInitPercent(ctx, median, percent); 05/01/95 PGASetRealInitPercent(2)
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