slepc-3.18.1 2022-11-02
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SlepcAbsEigenvalue

Returns the absolute value of a complex number given its real and imaginary parts.

Synopsis

PetscReal SlepcAbsEigenvalue(PetscScalar x,PetscScalar y)
Not Collective

Input parameters

x  - the real part of the complex number
y  - the imaginary part of the complex number

Notes

This function computes sqrt(x**2+y**2), taking care not to cause unnecessary overflow. It is based on LAPACK's DLAPY2.

In complex scalars, only the first argument is used.

This function is not available from Fortran.

Level

developer

Location

include/slepcmath.h

Examples

src/eps/tutorials/ex18.c.html
src/eps/tutorials/ex41.c.html
src/pep/tutorials/ex40.c.html
src/pep/tutorials/nlevp/pdde_stability.c.html


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