[Gnuplot-info] Fwd: How to realize a single plot in a double loop?

[ivana r. <iva...@mf...>]

Hi Theo,

I've noticed that 'title "" ' erase the corresponding key item, so the
code could be bit easier...much easier if onecould be sure that
Index3=1 always exists prior to higher values.

> I just thought, I overlooked a very simple, short and efficient method.
> Seems not to be the case.

well,

1, gnuplot is a "unix" program. As such, it can do something quite
well: to plot. It doesn't care about files. It supposes that you know
what you want to plot and provide requested files.

Under Unix/Linux, It'd be the default solution to generate a plot
script for each directory outside gnuplot. So, the primary task is how
simple can be this shell/pearl/... script.

Secondly, it's nice that you can even do inside script as well now in
V5+, although you need to run syscalls. (Personally, I'd appreciate if
I can disable all syscalls on startup at all. Otherwise I need to
check if there are commands such 'rm -rf /', 'chmod -R a+r ~/.ssh',
etc. in other-hands scripts.)

2, gnuplot is currently highly developed. Iteration and arrays will
probably continue development. Currently, on my wish-list there is (1)
a possibility to index arrays by letters OR get ascii code of chars,
and (2) to manipulate the iterating variable. Both would helpful also
in your case.

And you should install Ethan's patch

sourceforge.net/p/gnuplot/bugs/_discuss/thread/fcab9784/
af51/attachment/iteration_bug_v5.patch

for correct execution of iterations.

3, As I mentioned, the code can be rewritten to be more "word"-oriented.
In my opinion, such a code is more straight. You can found one here:

pebble.matfyz.cz/for_Theo.gplot

(I previously choose the pure-array version since you seem you like it.)

4, note that the code may be simpler if one would know what you prefer
to do if something. E.g., do you prefer make empty plots to keep the
Index1-based layout or would it be OK if plots fold? Is there
sometimes void in Index3 series? Etc.

5, under Unix/Linux, you can avoid warnings redirecting fd2:
- run "gnuplot 2>/dev/null"
- and inside code 'set print "/dev/stdout"'
- note that this disable warnings as well as errors. To see errors, you
can run e.g., ``if (GPVAL_ERRNO) { print "Error ", GPVAL_ERRNO, ": ",
GPVAL_ERRMSG; reset error; }'' when ever you except any.

(I'm not sure how to convert this for Windows, but I guess it should
be possible to work with STDOUT and STDERR there.)

Sincerely

Iva


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