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Geometry construction
Posted 2 juin 2015, 10:14 UTC−4 Interfacing, LiveLink for MATLAB, Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.4, Version 5.0 1 Reply
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Hi!
I'm trying to solve a geometry problem for my model using Matlab Livelink Comsol.
There is a "loop" using "for" to create multiples lines (BezierPolygon), but the program returns
just the last line I have created. Here is the code inside the loop:
model.param.set('a',j);
model.param.set('b',iv);
model.geom('geom1').feature.create(model.param().descr('nome'), 'BezierPolygon');
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(a-1)*0.001' '(a-1)*0.001'; 'b*0.001' '(b-1)*0.001'});
I suppose that the program is creating just the last line because all lines are define by 'a' and 'b'. So,
'a' and 'b' are changing according to j' and 'iv' (variables from matlab) in each single loop and, in the finalized geometry, all lines will have the same values for the coordinates.
So, my question is: there is a way to creating lines with evaluated coordinates? I mean making Comsol
understands that this line of code:
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(a-1)*0.001' '(a-1)*0.001'; 'b*0.001' '(b-1)*0.001'});
Should be read, for example making a = 2 and b = 2:
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(2-1)*0.001' '(2-1)*0.001'; '2*0.001' '(2-1)*0.001'});
Best regards, Flavi.
I'm trying to solve a geometry problem for my model using Matlab Livelink Comsol.
There is a "loop" using "for" to create multiples lines (BezierPolygon), but the program returns
just the last line I have created. Here is the code inside the loop:
model.param.set('a',j);
model.param.set('b',iv);
model.geom('geom1').feature.create(model.param().descr('nome'), 'BezierPolygon');
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(a-1)*0.001' '(a-1)*0.001'; 'b*0.001' '(b-1)*0.001'});
I suppose that the program is creating just the last line because all lines are define by 'a' and 'b'. So,
'a' and 'b' are changing according to j' and 'iv' (variables from matlab) in each single loop and, in the finalized geometry, all lines will have the same values for the coordinates.
So, my question is: there is a way to creating lines with evaluated coordinates? I mean making Comsol
understands that this line of code:
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(a-1)*0.001' '(a-1)*0.001'; 'b*0.001' '(b-1)*0.001'});
Should be read, for example making a = 2 and b = 2:
model.geom('geom1').feature(model.param().descr('nome')).set('p', {'(2-1)*0.001' '(2-1)*0.001'; '2*0.001' '(2-1)*0.001'});
Best regards, Flavi.
1 Reply Last Post 11 juin 2015, 13:16 UTC−4
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Posted:
10 years ago
Flavison,
I'm also interested in this situation for automating the construction of geometries using a 'for'-loop in MATLAB. I'd like to create a periodic structure using Bezier Polygon just by looping through a single variable or index. Something to this affect:
DC = 0.85;
L = 2.0e-6;
imax = 5;
for i = 1:imax;
model.param.set('m', i);
tag = model.geom('geom1').feature().uniquetag('b');
model.geom('geom1').create(tag, 'BezierPolygon');
model.geom('geom1').feature(tag).set('degree', {'1' '1' '1'});
model.geom('geom1').feature(tag).set('p', {'0' 't' 't' '0'; 'm*L' 'm*L' 'm*L + DC*L' 'm*L + DC*L'});
model.geom('geom1').feature(tag).set('w', {'1' '1' '1' '1' '1' '1'});
mphgeom(model, 'geom1')
pause(0.3)
tag
% update command??
end
As you mentioned, it doesn't seem to be saving each iteration, but almost overwriting the previous geometric component with the next value of the index. Maybe there is a command to either keep each component in a "geometric array" or update the model after every iteration. Let me know what you think.
Thanks,
Ethan
I'm also interested in this situation for automating the construction of geometries using a 'for'-loop in MATLAB. I'd like to create a periodic structure using Bezier Polygon just by looping through a single variable or index. Something to this affect:
DC = 0.85;
L = 2.0e-6;
imax = 5;
for i = 1:imax;
model.param.set('m', i);
tag = model.geom('geom1').feature().uniquetag('b');
model.geom('geom1').create(tag, 'BezierPolygon');
model.geom('geom1').feature(tag).set('degree', {'1' '1' '1'});
model.geom('geom1').feature(tag).set('p', {'0' 't' 't' '0'; 'm*L' 'm*L' 'm*L + DC*L' 'm*L + DC*L'});
model.geom('geom1').feature(tag).set('w', {'1' '1' '1' '1' '1' '1'});
mphgeom(model, 'geom1')
pause(0.3)
tag
% update command??
end
As you mentioned, it doesn't seem to be saving each iteration, but almost overwriting the previous geometric component with the next value of the index. Maybe there is a command to either keep each component in a "geometric array" or update the model after every iteration. Let me know what you think.
Thanks,
Ethan