Octave plotting error

Question

I am new to octave, I just tried my first plotting with Octave 3.4.0 when I get the following error. Any help will be much appreciated. The gnuplot version is 4.6

Answer 1

Just put here. When this error happened on me, I found this post and update my octaverc file with "setenv GNUTERM X11".

Then octave generated another error:

    error: popen2: popen2 (child): unable to start process -- No such file or directory
    error: called from:
    error: /usr/local/Cellar/octave/3.8.0/share/octave/3.8.0/m/plot/util/private/__gnuplot_open_stream__.m at line 30, column 40
    error: /usr/local/Cellar/octave/3.8.0/share/octave/3.8.0/m/plot/util/__gnuplot_drawnow__.m at line 72, column 19
    sh: x11: command not found

And the solution to that was adding gnuplot_binary("usr/YO/bin/gnuplot") to the octaverc file in /usr/local/share/octave/site/m/startup

Now plotting in octave is happy.

Answer 2

You might need to reinstall gnuplot with x11 support:

brew uninstall gnuplot;brew install gnuplot --with-x