[Maxima-bugs] [maxima:bugs] #4384 plot3d with no real values gives internal error

[Jaime E. V. <vi...@us...>]

- **status**: open --> closed
- **Comment**:

Fixed with commit [5c5a78]. Notice that the first gnuplot error message shown in this report is due to the use of a very old Maxima version. With the current git version, the result of:
~~~
plot3d(x+y+%i,[x,-2,2],[y,-2,2]);
~~~
is:
~~~
plot3d: nothing to plot.
 -- an error. To debug this try: debugmode(true);
~~~




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**[bugs:#4384] plot3d with no real values gives internal error**

**Status:** closed
**Group:** None
**Labels:** plot3d 
**Created:** Fri Oct 11, 2024 07:41 PM UTC by Stavros Macrakis
**Last Updated:** Fri Oct 11, 2024 07:41 PM UTC
**Owner:** nobody


``plot2d`` correctly gives an error when there are no real values:
~~~~
plot2d(x+%i,[x,-2,2]);
plot2d: expression evaluates to non-numeric value everywhere in plotting range.
plot2d: nothing to plot.
 -- an error. To debug this try: debugmode(true);
~~~~

But ``plot3d`` gives an internal error in gnuplot:
~~~~
plot3d(x+y+%i,[x,-2,2],[y,-2,2]);

gnuplot> set pm3d hidden3d 100 border lw 0.5 lt rgb "#000000"
                           ^
         line 2582: invalid pm3d option


gnuplot> splot "-" title "y+x+%i" with pm3d
                                           ^
         line 3575: All points z value undefined
~~~~

It should give a clean error in Maxima, not in gnuplot.

Tested in 5.47.0 SBCL 2.4.7 MacOS gnuplot 6.0/1.
  


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