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Re: increment a single element of matrix/vector
- From: Rhys Ulerich <rhys dot ulerich at gmail dot com>
- To: Patrick Alken <patrick dot alken at colorado dot edu>
- Cc: "gsl-discuss at sourceware dot org" <gsl-discuss at sourceware dot org>
- Date: Mon, 27 Jan 2014 20:08:32 -0600
- Subject: Re: increment a single element of matrix/vector
- Authentication-results: sourceware.org; auth=none
- References: <52E6EFF3 dot 1000808 at colorado dot edu>
> I was thinking of adding two routines to GSL, to increment a single element
> of a matrix or vector by some amount, since I'm always doing things like:
>
> gsl_vector_set(v, i, gsl_vector_get(v, i) + x);
>
> which I think is ugly and annoying....
Agreed. This has often bugged me.
> Or also is there another solution to this problem that I don't know about?
How about using
INLINE_DECL double * gsl_vector_ptr (gsl_vector * v, const size_t i);
to say *gsl_vector_ptr(v, i) += x ? Never knew about this until I
just went fishing for it.
- Rhys