From help-octave-request at bevo dot che dot wisc dot edu Wed Jan  7 16:09:50 2004
Subject: oct and inegers
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Claudio Belotti <bel8 at lilik dot it>
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Wed, 7 Jan 2004 16:09:39 -0600

On  7-Jan-2004, Claudio Belotti <bel8 at lilik dot it> wrote:

| I have an oct functions reading some files and returning data to
| octave (some of the values are integers, int32_t) after some
| operations I send the data back to the oct function; is there a way
| to understand if an octave_value is an integer or a double?

Unless you are using some add-on package that provides a special
integer data type, all numbers in Octave are stored internally as
double precision floating point values.  So you have to do something
like

  if (round (x) == x)

or, in a C++ file, I typically use

  if (NINT (x) == x)

(NINT is a macro defined in liboctave/lo-utils.h).

jwe



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