# naginterfaces.library.blas.idamax¶

naginterfaces.library.blas.idamax(x)[source]

idamax computes the index of the absolutely largest component of a real vector.

For full information please refer to the NAG Library document for f06jl

https://www.nag.com/numeric/nl/nagdoc_28.7/flhtml/f06/f06jlf.html

Parameters
xfloat, array-like, shape

The -element vector .

Returns
imaxint

The index of the absolutely largest component of the real vector, .

Raises
NagValueError
(errno )

On entry, error in parameter .

Constraint: .

Notes

No equivalent traditional C interface for this routine exists in the NAG Library.

idamax returns the smallest index such that

where is an -element real vector.

References

Lawson, C L, Hanson, R J, Kincaid, D R and Krogh, F T, 1979, Basic linear algebra supbrograms for Fortran usage, ACM Trans. Math. Software (5), 308–325