Integrating a matrix with symbolic values
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For a finite element method I have to perform a double integration to find the stiffness matrix. First using a function 'matrices' I set up the matrix 'stiffness'. This is an 8x8 matrix with the ymbolic values of 's' and 't' in it. I would then like to integrate w.r.t to both variables over a region of -1 to 1.
D = E*[1,v,0;
v,1,0;
0,0,0.5*(1-v)];
x6 = [0 1 2 0];
y6 = [0 0 2 1];
syms s
syms t
[J,A,M,B] = matrices(s,t,x6,y6);
stiffness = te*transpose(B)*D*B*det(J);
stuff = @(s,t) stiffness
K = integral2(stuff,-1,1,-1,1)
This gives me the following error: Input function must return 'double' or 'single' values. Found 'sym'.
How can I integrate this matrix with symbolic values?
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Answers (1)
Areej Varamban Kallan
on 31 Oct 2018
Hi Lars,
Please see the answer in this link to understand the method of performing double integration on symbolic arrays.
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