How to start working with GNU PLOT?? Post: 302592911

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Top Forums Shell Programming and Scripting How to start working with GNU PLOT?? Post 302592911 by chihung on Wednesday 25th of January 2012 07:57:32 AM

01-25-2012

Registered User

First, you create a Gnuplot template (template.gp)

Code:

set datafile separator "|"
set xdata time
set timefmt '%H:%M:%S'
set terminal png
set output 'column-@COLUMN@.png'
set yrange [0:]
set title 'column @COLUMN@'
set grid
plot 'SCP_CAPS_24012012.txt' using 1:@COLUMN@ title 'column @COLUMN@' with linespoints

Now you can dynamically substitute @COLUMN@ with the actual column number and create all the graphs in a loop

Code:

for i in 2 3 4 5 6 7 8
do
    sed "s/@COLUMN@/$i/g" template.gp | gnuplot - > /dev/null 2>&1
done

BTW, you can also plot all the columns in one single PNG file

Last edited by chihung; 01-25-2012 at 08:38 PM..

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column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-tx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     Column exits 0 on success, >0 if an error occurred.

ENVIRONMENT

     COLUMNS  The environment variable COLUMNS is used to determine the size of the screen if no other information is available.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME
" 
	   ; ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

AVAILABILITY

     The column command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

BSD
								   June 6, 1993 							       BSD