[Gmsh] how to get length of an extrude array

[Geordie McBain]

2011/12/13 Prakash Manandhar <jsaaymi at gmail.com>:
> I am a newbie. Say I have the following:
>
> h = 0.1;
> out[] = Extrude {h,0,0} {
>    Surface{1, 5, 14, 10}; Layers{10 }; Recombine;
> };
>
> How do I get the length of the out array.

I don't know a nice way, but here's what I do:

%<---
Point(1) = {0, 0, 0};
out[] = Extrude {1, 0, 0} { Point{1};};
For i In {0:2}
  Printf ("out[%g] = %g", i, out[i]);
EndFor
--->%

The message console then ends with:

%<---
out[0] = 2
out[1] = 1
Error   : 'count.geo', line 4 : Uninitialized variable 'out[2]'
out[2] = 0
Info    : Done reading 'count.geo'
--->%

which tells me that the length is two.  Then I go back and rewrite the
program knowing that.  This is only any good if the length is going to
be the same each time.
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