Hi
I'd like to compute the integral of the spatial gradient of 'the' solution,
i.e, integral( dot(grad u, grad r) ) dx.
'r' is the distance from a fixed point.
I'm thinking of using the central difference to calculate grad u and grad r and
then summing over. For this to work, I'd need the solution vector components to
be in correct spatial order as indicated below in an example for the case of a
unit line with h = 0.25.
i (index) : 0 1
2 3 4
x (space) : 0 0.25 0.5
0.75 1.0
solutionvector : a b c
d e
How can I order the solution vector yet still know the exact coordinates of its
components?
Is there a better/more efficient way to calculate the integral( dot (grad u,
grad r) ) dx?
Regards
Ted
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