Have all input values into a unique datafile

[scaramacai]

When saving any of VSWR, Zreal, Zimag etc, also the other input values are saved in the order: Frequency[MHz] Real{Zin}[Ohm] Imag{Zin}[Ohm] Mag{Zin}[Ohm] Phase{Zin}[deg.] VSWR Mag{S11}[dB] Z0 is also saved.

[scaramacai]

One can use "plot using 1:n ...", where 1 means the first column (Frequency) and n is any of Real(Zin), Imag(Zin) and so on.

[KJ7LNW]

Thanks for the pull request. It has highlighted some other issues in the code that need to be fixed as well. Here are the things that I would like to address if possible:

• Scale_Gain is duplicated in gnuplot.c and draw_radiation.c so it should be a shared function
• The gain selection is not saved in the users' config file
• _Write_Optimizer_Data() in optimize.c is nearly the same as Save_FreqPlots_Gnuplot_Data so I would like to reuse code if possible.
• There are no 2D polar gain plots which would be trivial to implement using gnuplot

Are you interested in working on any of these additional items?

[KJ7LNW]

I've staged these changes:

• Scale_Gain is no longer duplicated in gnuplot.c
• Now the gain selection is saved in the users' config file

These are outstanding:

• _Write_Optimizer_Data() in optimize.c is nearly the same as Save_FreqPlots_Gnuplot_Data so I would like to reuse code if possible.
• There are no 2D polar gain plots which would be trivial to implement using gnuplot

[KJ7LNW]

It might be nice to include a gnuplot template with the xnec2c package so the graphs look beautiful and users can use the .gplot template to load their exported data if they wish; xnec2c could even launch the gnuplot window using that template.

Would you like to contribute a beautified gnuplot template that takes your `plot "file.gplot" using 1:2, ..." that does the following?

• Labels all of the lines
• Provides a title
• Provides axis labels
• Auto scales to show the full graph

[scaramacai]

I know some tricks to do cartesian plots with gnuplot. You can, for example, have each quantity plotted in a different window in an almost automatic way, by using the recursive capabilities of gnuplot. Another possibility could be to plot together R(Zin) and Imag(Zin), Mag(Zin) and Arg(Zin) and maybe VSWR and |S11|. I'll try to provide you with some templates. Some time ago I implemented launching a gnuplot session from gtk. I should have still the code. I'll look for. With respect this pull request I experimented also another format, made by a simple heading line, without comments, and where all columns are separated by tabs. This work for me with gnuplot 5.2, but have no idea if there could be issues with older versions. The advantage would be that the file can be read as a CSV file by ParaView (I'm using version 5.7). Note that using commas to separate fields can be do also for gnuplot, but you must explicitly declare the separator. As for ParaView, I managed to export the 3D radiation patter in vtk format. I will open another issue for that. As for your request to work on 2D polar plot, may be I can help. I have limited time but I'll try to do my best.

[KJ7LNW]

Tab separated might work for gnuplot. Also there is a "set delimiter" command for gnuplot.

[ewheelerinc]

@scaramacai:

I just refactored the measurements code so plots can be generalized. This will facilitate both gnuplot output and s1p/s2p output in the future as well.

Using the measurements code is pretty easy, especially if you are just dumping all measurements to a file. See how optimize.c generates the CSV. You should be able to generate a .gnuplot easily using this example:

https://github.com/KJ7LNW/xnec2c/blob/master/src/optimize.c#L61

I'm not sure if you will need it, but see meas_format() if you need specific measurement values.

-Eric

[KJ7LNW]

GnuPlot columns from this PR were added in v4.4.7, so closing the PR.