[Gmsh] "For" loop with a variable incrementation step

[Lucas Blattner Martinho]

Dear Gmsh developers,


I am trying to use Gmsh's "For" loop with a variable incrementation step,
however I am not obtaining the expected results.

For example, I expected the following Gmsh commands

step = 1.0;
For k In {0:100:step}
Printf("step = %f   k = %f", step, k ) >> "test.txt";
step = step +1;
EndFor


would produce an output file called "test.txt"  containing the following
data:

step = 1.000000   k = 0.000000
step = 2.000000   k = 2.000000
step = 3.000000   k = 5.000000
.
.
.
and so on.


However, the previous commands result in the following output file:

step = 1.000000   k = 0.000000
step = 2.000000   k = 1.000000
step = 3.000000   k = 2.000000
step = 4.000000   k = 3.000000
step = 5.000000   k = 4.000000
.
.
.
and so on.


It seems that incrementation of the "step" variable inside the loop does not
result in a variable update of "k", which keeps growing with unit steps.

I found this strange behaviour while trying to emulate  a "While" loop ,
which doesn't appear to be promptly available in Gmsh (by setting a "step"
variable bigger than the "for" loop's range,  when some break
condition is satisfied
).


Am I missing something and these are in fact the expected behaviours, or
would this be a bug of some sort?
Is there a better way to work these issues around (emulating a "While" loop)
?



yours faithfully,
Lucas Blattner Martinho
**
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