Re: isnan() in an oct file

[Jordi Gutiérrez Hermoso]

On Thu, 2015-04-16 at 07:17 -0700, babelproofreader wrote:
> How does one check, in an oct file, that the result of some matrix
> multiplication produces real values in the resultant matrix
> and not NaN values,

Use the isnan() method of the array types or octave_value. It is
what the isnan function from the interpreter calls:

    
http://octave.sourceforge.net/doxygen/html/d3/dd5/classNDArray.html#a47bf50a40032e59e1570e6b4c6d7721e

    
http://octave.sourceforge.net/doxygen/html/de/ddd/mappers_8cc_source.html#l01400

> and how would this be reported, e.g. line number of code, to
> terminal?

Use the error() function, e.g.

    
http://hg.savannah.gnu.org/hgweb/octave/file/043dcb4da5fc/libinterp/corefcn/pinv.cc#l90

HTH,
- Jordi G. H.