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From: Michael <proximum@land.ru>
Newsgroups: comp.graphics.apps.gnuplot
Subject: System evaluation
Date: Thu, 15 Dec 2011 13:57:55 +0600
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Hello,

I need to calculate the maximum value of the matrix from a file before 
plotting.
The following code works in Linux:

a=`echo "printf('%f',max(max(load('field.txt'))))" |octave -q`
set cbrange[0.8*a:a]

but in Windows gnuplot gives an error:

warning: system evaluation not supported by MS-Windows 32 bit

Is there the way to perform this calculation under Windows?