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GNU Scientific Library Reference Manual - Third Edition (v1.12)
by M. Galassi, J. Davies, J. Theiler, B. Gough, G. Jungman, P. Alken, M. Booth, F. Rossi
Paperback (6"x9"), 592 pages, 60 figures
ISBN 0954612078
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8.4.12 Matrix properties

The following functions are defined for real and complex matrices. For complex matrices both the real and imaginary parts must satisfy the conditions.

Function: int gsl_matrix_isnull (const gsl_matrix * m)
Function: int gsl_matrix_ispos (const gsl_matrix * m)
Function: int gsl_matrix_isneg (const gsl_matrix * m)
Function: int gsl_matrix_isnonneg (const gsl_matrix * m)
These functions return 1 if all the elements of the matrix m are zero, strictly positive, strictly negative, or non-negative respectively, and 0 otherwise. To test whether a matrix is positive-definite, use the Cholesky decomposition (see 13.5).
ISBN 0954612078GNU Scientific Library Reference Manual - Third Edition (v1.12)See the print edition