tirsdag den 29. april 2008 kl. 13.33.31 UTC+2 skrev Juergen Wieferink:
Ingo Thies wrote:
c1=1;c2=2
plot 'file' using c1:c2
But is it also possible to use variables for column numbers as a
function argument? "$c1" or similar don't work. For now, I can only do
this by replacing the column specifier in all the lines by
search&replace, but a global switch would be much more convenient.
This could be done using macros "help macro", but the clean way is
via the column() function (help column) [untested]:
c1=1;c2=2
plot 'file' using (column(c1)):(column(c2))
Juergen
Thanks, This works amazing if one wants to do math on each entry in a column, but directly in a bash script, for example subtracting some number from every entry:
#!/bin/bash
gnuplot <<-EOF
set terminal pdf
set output "test.pdf"
plot "data.dat" u 1:(column(2)-2.63E-02) with lines
EOF
evince test.pdf
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