Cell array: select only 1x3 double cells

3 vues (au cours des 30 derniers jours)
Riccardo Rossi
Riccardo Rossi le 15 Jan 2019
Commenté : Guillaume le 15 Jan 2019
Hi everyone,
i have a 1x4 cell array like this:
{[0.1]} {1×3 double} {[0.02]} {1×3 double}
and i want to extract only the 1x3 double cells (of which I do not know the exact location into cell array).
Thank's a lot!
Riccardo Rossi

Réponse acceptée

Stephen23
Stephen23 le 15 Jan 2019
Modifié(e) : Stephen23 le 15 Jan 2019
Where C is your cell array:
X = cellfun('length',C)==3;
out = C(X)
  7 commentaires
Stephen23
Stephen23 le 15 Jan 2019
F = @(v)isnumeric(v)&&isrow(v)&&numel(v)==3;
X = cellfun(F,C);
out = C(X)
Guillaume
Guillaume le 15 Jan 2019
So It should Be Faster Because There's No Overloading Involved?
It is faster because cellfun use a different algorithm when using the backward compatible syntax. The built-in code does not call any other function when iterating over the elements, it's got its own implementation of length.
One side effect of that is that if you've overloaded length for a type in the cell array, that overload won't get called. For that reason, I personally wouldn't recommend using the old syntax unless you're 100% certain that your cell array will never ever contain objects. There's a reason the old syntax has been deprecated.

Connectez-vous pour commenter.

Plus de réponses (0)

Catégories

En savoir plus sur Matrix Indexing dans Help Center et File Exchange

Produits


Version

R2018a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by