Re: [Gnuplot-info] passing an argument to gnuplot script

[tmacchant <tma...@ya...>]

> okay if i want to pass  a parameter ,i have the bash script and i want to
call my gnuplot file  and pass > > this parameter (which is a number)to it .
now in the bash script i used
> this command       gnuplot /home/yas/file.gnuplot $1
> and in the gnuplot file i need to be able to take this $1 ..how to do
> that?
> i tried arg but it did not work!

I did not say the below works 

 gnuplot /home/yas/file.gnuplot $1

I have wrote some working examples. Did not you look those?

As far as I know, there are two ways to pass the parameter to the script.
The below examples were already written in separately, but I summarize in
one for the convenience.

****************************************************
1. Scripts are prepared to use parameters and initial values of them are
determined outside of script.

#test.gp 
set term pngcairo
set out 'paratest.png
plot a*x+b
set out 
#end of test.gp

echo "a=2;b=3;load 'test.gp'" | gnuplotcvs 

or
 
gnuplot -e "a=2;b=3;load 'test.gp'"

2. Prepare scripts using argument variable ($0, $1,... (ver. <= 4) or  ARG1,
ARG2, (ver.5)) and argument passed by command line

****************************************************************************
Note that command line options are changed at ver. 5.

Version 4
$ gnuplot --help
Usage: gnuplot [OPTION]... [FILE]
for X11 options see 'help X11->command-line-options'
  -V, --version
  -h, --help
  -p  --persist
  -d  --default-settings
  -e  "command1; command2; ..."

Version 5
$ gnuplot --help
Usage: gnuplot [OPTION] ... [FILE]
for X11 options see 'help X11->command-line-options'
  -V, --version
  -h, --help
  -p  --persist
  -d  --default-settings
  -c  scriptfile ARG1 ARG2 ... 
  -e  "command1; command2; ..."

The option to use call mechanism is added on ver. 5
 -c  scriptfile ARG1 ARG2 ... 

****************************************************************************

I show a example for ver.5

#calltest.gp 
a=ARG1; b=ARG2
set term pngcairo
set out 'paratest.png
plot a*x+b
set out
#end of calltest.gp 

gnuplotcvs -e "call 'calltest.gp' 2 3" # works on all version
or 
gnuplotcvs -c calltest.gp 2 3 # works only on ver. 5 or later

For ver.4 or before, ARG1 and ARG2 should be replaced by $0 and $1.

Note for call script for ver.4 or before,

 NOTE: there is a clash in syntax with the datafile `using` callback
 operator.  Use `$$n` or `column(n)` to access column n from a datafile
inside
 a `call`ed datafile plot.

Tatsuro



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