This interface overloads the eigvalsh interface from stdlib_linalg
to compute the eigenvalues of the Poisson2D matrix .
lambda = eigvalsh(A)
A : Matrix of Poisson2D type. It is an intent(in) argument.
lambda : Rank-1 real array returning the eigenvalues of A
in increasing order.
Note
The eigenvalues of the Poisson2D matrix are known analytically
and can thus be computed efficiently.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| type(Poisson2D), | intent(in) | :: | A |
Input matrix. |
Eigenvalues.