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Groups > comp.graphics.apps.gnuplot > #2557

Re: difficult for loop synax :-|

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Hello Ethan,

Thank you for your time! I was trying to make self-contained example, but because it was simple enough you "optimized" it ;-) "Premature optimization is the root of all evil", said D. Knuth :-D

On Thursday, August 21, 2014 2:15:51 AM UTC+9, Ethan A Merritt wrote:
>> Well, may be I oversimplified it, but the real thing is too complex
>> anyway. What about this:
>> 
>> reset; f1(x) = (C=1.134324*x,0); f2(x) = sin(C*x); set xrange [0:3.14];
>> plot a=f1(1), f2(x) title "n=1", a=f1(2), f2(x) title "n=2" , a=f1(3),
>> f2(x) title "n=3";
> 
> It is still not clear what you are aiming for.
> The sequence of commands above does not make sense.
> 
> The function f1(x) is never plotted, so it plays no role except for
> its side effect of setting C to a constant.
>
Well, yes I'd have to admit I am using side-effects here.
And my code is turning to a small mess because I am trying to have gnuplot do statistics in-line, instead of preprocessing the data.

My current code is here: https://github.com/thinrope/fixed_sensor_visualization/blob/master/timeplot_all.gpl#L26

plot for [ID in IDs] "tmp/" . ID . ".data" u 1:2 axes x1y2 w l lw 2 title graph_title(ID);

What I wanted to do is add another SMA filter on each datafile (or 2 with different window) and still have it plot similar graph.

so having defined SMA as in https://github.com/thinrope/fixed_sensor_visualization/blob/master/timeplot.gpl#L46 I was planning to write something along:

plot for [ID in IDs] a=sma_24_init(0), "tmp/" . ID . ".data" u 1:(sma_24($2)) axes x1y2 w l lw 2 title graph_title(ID);
 
IDs are list of numbers coming form the environment/Makefile, but can be strings. 

May be possible with `set table` and `do for [ID in IDs]{init; plot;}` but I'd rather avoid it.


Alternatively, something along

init_OK=0; f3(x,n) = (init_OK ? a=f1(n): 0, f2(x));
plot for [n=1:3] a=f3(x,n);
         undefined variable: x
:-|

Kalin.

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difficult for loop synax :-| Kalin Kozhuharov <me.kalin@gmail.com> - 2014-08-19 11:57 -0700
  Re: difficult for loop synax :-| Ethan A Merritt <EAMerritt@gmail.com> - 2014-08-19 18:03 -0700
    Re: difficult for loop synax :-| Kalin Kozhuharov <me.kalin@gmail.com> - 2014-08-19 23:15 -0700
      Re: difficult for loop synax :-| Ethan A Merritt <sfeam@users.sourceforge.net> - 2014-08-20 10:15 -0700
        Re: difficult for loop synax :-| Kalin Kozhuharov <me.kalin@gmail.com> - 2014-08-20 11:50 -0700
          Re: difficult for loop synax :-| Ethan A Merritt <EAMerritt@gmail.com> - 2014-08-20 17:50 -0700
            Re: difficult for loop synax :-| Kalin Kozhuharov <me.kalin@gmail.com> - 2014-08-20 23:02 -0700

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