[Bug-gsl] Documentation bug(?)

[Justin Lenzo]

Dear GSL developers:

Forgive me if I am reading things wrong, but the manual section 8.3.10
(Vector properties) seems incorrect.  It reads:

 To test for a non-negative vector, use the expression !gsl_vector_isneg(v).

But gsl_vector_isneg() seems to return false if *any* entry is
non-negative.  The vector being non-negative would require *all* entries
be non-negative.  It seems one would have to test gsl_vector_min(v) >= 0
to test for a non-negative vector.

The same sort of issue appears in the analogous matrix page.  Also on the
matrix page, I think you might want to note on this page that one needs to
disable the default error handler in order to use the Cholesky routine as
a *test* of positive definiteness (the routine calls GSL_ERROR() if the
matrix is not positive definite).

Thank you,
Justin