[Gmsh] Variable Not Updating In For Loop

[Jeremias Gonzalez]

Hi, below (and attached) is a simple script where, in a for loop, I make 
a mesh for a cube, output the mesh, then start over and make the mesh 
again with a changed number. For some reason, as can be seen from the 
printed line in each iteration of the loop, the variable instantiated by 
the for loop is changing as expected, but the parameter I made that sets 
the variable as its own value is stuck at the original value. Even 
stranger, just to be sure that the parameter is getting refreshed each 
time since it wasn't overwriting like I expected, at the beginning of 
the for loop I tried deleting the parameter, then allow it to be 
declared anew with the current for loop variable, but it remains stuck 
with the value it received from the first value from the for loop. Can 
anyone explain where things are going wrong? Is there a better way to do 
a parametric sweep and output of meshes?

SetFactory("OpenCASCADE");

For newcubelength In {0.1:0.25:0.05}

Delete cubelength;
cubelength = DefineNumber[ newcubelength, Name "Parameters/cubelength" ];

Block(1) = {0, 0, 0, cubelength, cubelength, cubelength};

Physical Volume("cubebody", 1) = {1};

Mesh.SaveElementTagType=2;
Mesh.Format=30;
Mesh 3;
Save Sprintf("cube%g.mesh",cubelength);

Printf("%g,%g",cubelength,newcubelength);

Delete Model;
Delete Physicals;

EndFor

-------------- next part --------------
SetFactory("OpenCASCADE");

For newcubelength In {0.1:0.25:0.05}

Delete cubelength;
cubelength = DefineNumber[ newcubelength, Name "Parameters/cubelength" ];

Block(1) = {0, 0, 0, cubelength, cubelength, cubelength};

Physical Volume("cubebody", 1) = {1};

Mesh.SaveElementTagType=2;
Mesh.Format=30;
Mesh 3;
Save Sprintf("cube%g.mesh",cubelength);

Printf("%g,%g",cubelength,newcubelength);

Delete Model;
Delete Physicals;

EndFor