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From: Pete Gregory <pgnewsg@bushlitt.org>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Applying arithmetic to a computed column
Date: Thu, 24 Jan 2013 09:20:51 -0500
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Salutations

I have a simple script that plots different columns and blocks using the 
looping capabilities in gnuplot4.6 (and many thanks to those who coded 
it up).

in the loop I have
plot 'myfile' using rfchan index dut with lines {etc etc}
where rfchan and dut are for loop variables.

This works perfectly other than I realize now it would be better scaled 
in mA rather than A.   Were I using just column 2 (say), it would be easy

plot '' using ($2*1000) {etc etc}

but (rfchan*1000) will resolve to looking for column  (rfchan*1000).

Is there an easy way to do both the computed column and value multiply ?

TIA
Pete