How plot directly from terminal in gnuplot?

Question

I run the command

/usr/local/bin/gnuplot -e set terminal png; set output bench.png; plot '/Users/masi/0deg/loop_data.txt' u 1:2

giving the error

set
   ^
line 0: unrecognized option - see 'help set'.

I set the setting of the terminal and output because I realized from this answer, here, that they are required. I run the same command in Bash and Zsh unsuccessfully by getting exactly the same error message.

I run

/usr/local/bin/gnuplot -e "set terminal png; set output bench.png; plot '/Users/masi/0deg/loop_data.txt' u 1:2"

and I get

line 0: internal error : STRING operator applied to non-STRING type

How can you run plotting of a figure directly in terminal for gnuplot?

Tom Fenech · Accepted Answer · 2015-03-30 13:32:19Z

2

You need to add some double quotes around the command:

/usr/local/bin/gnuplot -e "set terminal png; set output 'bench.png'; plot '/Users/masi/0deg/loop_data.txt' u 1:2"

Without the double quotes, only the first word is being interpreted as the entire script, which is leading to the error you are experiencing.

You also need to use quotes around your output file name, which solves your second problem. The issue here is that gnuplot is interpreting bench as a variable name and attempting to do a string concatenation.

edited Mar 30, 2015 at 13:32

answered Mar 30, 2015 at 13:26

Tom Fenech

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2 Comments

Léo Léopold Hertz 준영 Over a year ago

I updated the body. Internal error. I think this may be now my memory problem. I try to free up some space and see what I get now. Your command should be correct.

Léo Léopold Hertz 준영 Over a year ago

Works now! I had also a memory problem which confused me about the error messages. Thank you for your answer!

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