Plot Saving Problems

[Rongcui Dong]

Hello,

I try to save plots from a script, and I encounter two problems:

1. If I use FLTK as graphics toolbox, the plot can be saved normally,
but only if the figure is set to visible, which makes windows keep
popping up.
2. If I use GnuPlot, then I can preview correctly but the saved files
are completely black plots regardless the format.

My system is Funtoo/amd64, Octave version 3.8.1, GnuPlot 5.0. I can
still go with the popping windows, but it would be nice to solve (at
least) one of the two problems. Attachment is the script and black plots.

Thank you!

-- 
Rongcui Dong

Control_to_Output.m
Description: Text Data

Control_to_Output_Magnitude.pdf
Description: Adobe PDF document

Control_to_Output_Phase.pdf
Description: Adobe PDF document