finding the sparsity pattern of a matrix

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Deepa Maheshvare
Deepa Maheshvare on 13 Feb 2021
I've a matrix created via symbolic multiplication
I'm sharing an example of the resulting matrix below (which is the RHS of ode dy/dt = F)
F =
[ f1*(k + c), f2, 0]
[ f1, f2, f3]
[ 0, f2, f3*(k)]
[ f1, 0, f3]
Differentiating F gives the jacobian.
In my real system, F is a banded matrix. I want to find sparsity pattern of the matrix(like the following) and supply for `JPattern` in `odeset`.
non_zero_F =
[1, 1, 0]
[1, 1, 1]
[0, 1, 1]
[1, 0, 1]
  1 Comment
Alamanda Ponappa Poovaya
Alamanda Ponappa Poovaya on 25 Mar 2021
From my understanting, sparsity pattern of a matrix is a graphical representation which you can get using spy(s). Could you give more information on how you want to use this sparsity pattern?

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