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Define varialbes
Posted Sep 4, 2012, 3:37 p.m. EDT Parameters, Variables, & Functions Version 4.3 0 Replies
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I set up a PDE model in COMSOL v4.3. the independent variables are BX,BY,BZ. and a group of dependent variables are HX,HY,HZ, where [HX HY HZ] = fun(BX,BY,BZ). fun() is a nonlinear function defined in matlab.
In COMSOL, I can only allocate variable values one by one as follow:
HX = fun(BX,BY,BZ);
HY = fun(BX,BY,BZ);
HZ = fun(BX,BY,BZ).
Then the function fun is run by 3 times, which consumes a lot of unnecessary time. When the derivatives are included, the simulation speed is even worse, because my derivatives are also calculated using fun(). Theoretically, the fun() only need to be run by once, and HX,HY,HZ and all the derivatives are ready to use. Do you know how to allocate values of all the variables through calling fun() once?
Now, I try to set up a global structure variable G_data. G_data = fun(BX,BY,BZ), and
HX = G_data.HX;
HY = G_data.HY;
HZ = G_data. HZ.
Do you think this method can solve the problem?
Thanks a lot
Dan
Hello Zhangxian Deng
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