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model.param.set
Posted Dec 29, 2014, 6:39 p.m. EST Interfacing, Geometry, Parameters, Variables, & Functions Version 4.4 1 Reply
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Hi,
Are there someone would like to give me some help about 'model.para.set'?
I have three variables in comsol model, which are p_1, p_2, p_3.
So in my matlab function, I worte
model.para.set ('p_1',x(:,1));
model.para.set ('p_2',x(:,2));
model.para.set ('p_1',x(:,3));
Is there some way to write them somehow in one sentence, like
model.param.set(p(j),x(k,j));
this is totally wrong, but I want to find a way to call 'model.param.set' only once and deal with a matrix rather than several times deal with an element each time.
Thanks for the help in advance.
Best regards
Yanrui
Are there someone would like to give me some help about 'model.para.set'?
I have three variables in comsol model, which are p_1, p_2, p_3.
So in my matlab function, I worte
model.para.set ('p_1',x(:,1));
model.para.set ('p_2',x(:,2));
model.para.set ('p_1',x(:,3));
Is there some way to write them somehow in one sentence, like
model.param.set(p(j),x(k,j));
this is totally wrong, but I want to find a way to call 'model.param.set' only once and deal with a matrix rather than several times deal with an element each time.
Thanks for the help in advance.
Best regards
Yanrui
1 Reply Last Post Dec 30, 2014, 7:32 p.m. EST
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Posted:
10 years ago
more explanation of the problem
I use genetic algorithm to optimize a design which is simulated in comsol
I ran profile in matlab and since I can't reduce the time costed by comsol built in function, I am trying to reduce the time that comsol functions being called. Let the functions do more work each time by vectorization.
now my code is like
parfor k=1:size(x,1);
model.para.set ('p_1',x(k,1));
model.para.set ('p_2',x(k,2));
model.para.set ('p_1',x(k,3));
...
end
This code will call 'model.para.set' amount of time during running.
if it is able to write like
parfor k=1:size(x,1);
model.para.set ({'p_1' 'p_2' 'p_3'},{x(k,1) x(k,2) x(k,3)});
...
end
which is wrong but could reduce the calling time to almost 1/3.
Further more, the code is somehow like
j=1:3; %three variables need to optimized
k=1:size(x,1);
model.para.set (p(k,j),x(k,j));
which apparently wrong but may reduce the calling time to very few times. besides I may even could use some matlab function like 'arrayfun' later on.
I check use manual and found assign 'pname' could change parameter set to variable in comsol. However I think it is only possible for some special case, such as parameter swept or some comsol built in optimization.
And even 'pname' is not the way I want.
Any ideas about this problem?
Thanks.
I use genetic algorithm to optimize a design which is simulated in comsol
I ran profile in matlab and since I can't reduce the time costed by comsol built in function, I am trying to reduce the time that comsol functions being called. Let the functions do more work each time by vectorization.
now my code is like
parfor k=1:size(x,1);
model.para.set ('p_1',x(k,1));
model.para.set ('p_2',x(k,2));
model.para.set ('p_1',x(k,3));
...
end
This code will call 'model.para.set' amount of time during running.
if it is able to write like
parfor k=1:size(x,1);
model.para.set ({'p_1' 'p_2' 'p_3'},{x(k,1) x(k,2) x(k,3)});
...
end
which is wrong but could reduce the calling time to almost 1/3.
Further more, the code is somehow like
j=1:3; %three variables need to optimized
k=1:size(x,1);
model.para.set (p(k,j),x(k,j));
which apparently wrong but may reduce the calling time to very few times. besides I may even could use some matlab function like 'arrayfun' later on.
I check use manual and found assign 'pname' could change parameter set to variable in comsol. However I think it is only possible for some special case, such as parameter swept or some comsol built in optimization.
And even 'pname' is not the way I want.
Any ideas about this problem?
Thanks.