Discussion Forum

I have trouble with the difference operation in Comsol. My geometry is based upon a matlab code where the amount of cylinders can change. I want to use a selection in the boolean operation, however I can only simply click all domains separately and cannot use the explicit selection that I created.
Also when I create a simple cell array containing all the strings of geometries that are needed in matlab the comsol syntax does not use a cell array, which is the type where strings are stored in matlab (are not stored in lists). Simply looping does not work either for the input because then only the last (cyl%n) is used as input for the difference.

model.geom('geom1').feature('dif1').selection('sel1').set({'sel1'}); #does not work
model.geom('geom1').feature('dif1').selection('sel1').set({a}); with a = {'cyl1' 'cyl2' 'cyl3'}; #does not work

for i = 1:length(n);
str = sprintf('cyl%d', i);
model.geom('geom1').feature('dif1').selection('sel1').set({str});
end
#only gives a difference with the last cylinder.

I hope someone can help me with this!
Thank you in advance