How to correct the error in specifycoefficient
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My function is
function c=ccoef(nodes,elements,~,~,~,~)
N=1;
nr=size(elements,2);
c=zeros(N,nr);
c(1,:)=1/3/(0.02+0.01*20)*ones(1,nr);
a=[];
for i=1:size(nodes,2)
if nodes(1,i)>-0.1 && nodes(1,i)<0.1 && nodes(2,i)<=-5
a=[a i];
end
end
[~,col]=find(elements==a(1));
% b=1/3./(0.02+0.01*20);
c(:,col(1))=1/3./(0.3+0.01*20);
specifyCoefficients(model,'m',0,'d',0,'c',@ccoef2,'a',@acoef,'f',@fcoef);
Error in command window is
Error in pde.PDEModel/specifyCoefficients (line 139)
coef = pde.CoefficientAssignment(coefcont,argsToPass{:});
Error in fem (line 14)
specifyCoefficients(model,'m',0,'d',0,'c',@ccoef2,'a',@acoef,'f',@fcoef);
How to correct this error
kindly help me
4 Commenti
Ravi Kumar
il 18 Giu 2019
Coefficient functions should use region and state, which contain coordinates and solution values, respectively, to compute the coefficient. You don't need to deal with elements and nodes as you are doing. Refer to simple examples in the documentation page: https://www.mathworks.com/help/pde/ug/pde.pdemodel.specifycoefficients.html
Also, it looks like you are modeling axisymmetric problem, correct? If so, you need to modify the setup a bit as PDE Toolbox uses Cartesian coordinates.
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