the isnumeric function and the NaN
30 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a matrix array (A) that includes three column arrays. All columns contain integers except that one of the columns also include NaNs. When I type isnumeric(A), the output is a logical value 1. Apparently NaN is recognised as a numeric entry as otherwise MATLAB would return a logical value of 0. How is a NaN recognised exactly?
6 commentaires
Stephen23
le 7 Sep 2018
Modifié(e) : Stephen23
le 7 Sep 2018
@Snoopy: The behavior of NaN's within MATLAB operations is explained here:
NaN's are just a particular bit pattern that is assigned to have the value Not-a-Number. To know more about the classes that support NaN's, you need to read about IEEE 754 standard (the well-supported 1985 version), which defines the floating point numbers that MATLAB uses:
This also explains how the numbers are stored, including the "special" values like Inf and NaN:
Réponses (1)
Cesar Antonio Lopez Segura
le 7 Sep 2018
Hi,
Write this in your command window:
isnan( [ 0 1 NaN] )
0 commentaires
Voir également
Catégories
En savoir plus sur Matrix Indexing dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!