As reported on 23 May 13 to the mailing list and requested as a bug report by Raymond Toy:
This statement gives an error:
[gnuplot_preamble, "set pm3d map"],[grid,1,1],[transform_xy,make_transform([r,theta,z],rcos(theta),rsin(theta),z)])$
The error I get is:
Maxima encountered a Lisp error:
The value NIL is not of type DOUBLE-FLOAT.
This is an error within transform_xy because when I remove the transform_xy is works fine.
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