On 11/19/18 11:59 PM, FU wrote:
> How to get the derivative of a vector?
>
>
> Jacobian matrix of vectors
> T^4 is a vector.
That's a misunderstanding. I suspect that you have a term of the form
T(x)^4
in your PDE, but if you multiply this by test function phi_i and integrate
over the domain, you get a vector
F_i = \int_\Omega \phi_i(x) T(x)^4 dx
which is not the element-by-element fourth power of the nodal vector T that
corresponds to T(x).
You will want to look at how step-15 solves nonlinear problems to see how to
approach such problems.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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