Description of the program: corr

This program computes the autocorrelation of a scalar data set. Depending on whether the -n flag is set or not, different normalizations are applied. With -n not set the definition is:

where s is the standard deviation of the data and y its average. Else it is

Usage:

corr [Options]

Everything not being a valid option will be interpreted as a potential datafile name. Given no datafile at all, means read stdin. Also - means stdin

Possible options are:

Option Description Default

-l# number of data to use whole file

-x# number of lines to be ignored 0

-c# column to be read 1

-D# number of correlations 100

-n don't use normalization to standard deviation not set

-o# output file name
without file name: 'datafile'.cor
(or stdin.cor if stdin was read)
If no -o option is given stdout is used

-V# verbosity level
0: only panic messages
1: add input/output messages 1

-h show these options none

Option	Description	Default
-l#	number of data to use	whole file
-x#	number of lines to be ignored	0
-c#	column to be read	1
-D#	number of correlations	100
-n	don't use normalization to standard deviation	not set
-o#	output file name	without file name: 'datafile'.cor (or stdin.cor if stdin was read) If no -o option is given stdout is used
-V#	verbosity level 0: only panic messages 1: add input/output messages	1
-h	show these options	none

Description of the Output:

The first two lines contain: 1. the average and 2. the standard deviation of the data. The following lines are the autocorrelations (first column: delay, second column: autocorrelation).

View the C-sources.