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Groups > comp.graphics.apps.gnuplot > #1422

accesssing shell array variable with a gnuplot loop index

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Hello all,

I need to use shell variables in my gnuplot commands, for which I'm using the here document style. I also need to use loops inside the gnuplot code. Both these things are working.

Now -- I want to use a gnuplot for loop's index to access a shell array variable. This is where I've been stuck all day.

I have something like this:

for ((i=0; i<=10; i++))
do
var[$i] = i*10
done

gnuplot<<EOF
do for [j=1:10]{
#need to access ${var[j]} somehow
val=sprintf("${var[%d]", j) ##doesn't work
}
EOF

(Individual access like ${var[1]} works.) 

I thought of first storing the *name* of the shell variable somewhere and then dereferencing it (using $), but didn't work. 

I suspect this may need using backquotes and/or expr, but am not sure. The manual mentions the 'value' command which seems to be what would be required here, but I couldn't get it to work. The 'evaluate' command also looks relevant. I have been reading the bash and gnuplot manuals -- have learned a lot the past few hours, but couldn't solve the problem.


Best
Faraz

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accesssing shell array variable with a gnuplot loop index fh.faraz.hussain@gmail.com - 2012-10-20 19:22 -0700
  Re: accesssing shell array variable with a gnuplot loop index fh.faraz.hussain@gmail.com - 2012-10-21 13:59 -0700

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