How to call gnuplot from CLI and save the output graph to the image file?

问题

I'm writing a batch file which will also generate a gnuplot graph from a dat file.

I wish to call gnuplot from the command line, using the gnuplot "gnu" script I have written, and save the output graph to an image.

Something like:

gnuplot.exe script.gnu > image.png

Any ideas?

回答1:

Simply putting the following line will make gnuplot to return png-format bytecode. Thus, you can redirect the output to a png-file.

set terminal png

回答2:

You don't have to redirect the output from gnuplot into an image file; you can set that inside the gnuplot script itself:

set terminal png
set output 'image.png'

If you want to have a variable output name, one simple way to do that in bash is to wrap the gnuplot commands thus:

#!/bin/bash

echo "set terminal png
set output '$1'
plot 'data.dat'" | gnuplot

This way you can run the bash script with an argument for the output file name:

./plotscript.sh image.png

回答3:

When your batch file runs gnuplot only (with the script) and does nothing else, then you can combine the batch file with the gnuplot script:

@echo off & call gnuplot -e "echo='#';set macros" "%~f0" & goto :eof

set terminal png
set output 'image.png'
...

Save this with .cmd extension.
The advantages of this is that:

• you have only 1 file instead of two
• that file is runnable from Explorer/TaskScheduler/etc. in a portable way
  (no need to associate a new extension with gnuplot.exe)

In other words, this is the Windows "equivalent"(?) of the #!/usr/bin/env gnuplot solution of Unix
(this is why I find it so comfortable when working with gnuplot scripts under Windows).
(Note: 'call gnuplot' is used to allow for a gnuplot.cmd file somewhere in the PATH -- as opposed to polluting the PATH with the folder of gnuplot.exe (and many other programs).)

回答4:

The previous solutions doesn't work, you need to implement:

First: create the script.sh like this:

!/bin/sh

gnuplot << EOF
set terminal postscript eps color enhanced
set output "$1.eps" # all the declarations that you need
set xlabel "Energy [MeV]"
plot "$1.dat" using 1:2 notitle w l
EOF

Second: execute the script:
$ ./script.sh data
*the parameter data es the .dat file that you will use for to graph...

It really works!

来源：https://stackoverflow.com/questions/14047061/how-to-call-gnuplot-from-cli-and-save-the-output-graph-to-the-image-file