How to reference values in cell array containing matrices
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a cell in which each element is a matrix. I would like to extract a vector containing all the matrices' entries for row 5, column 4. Is this possible, without having to loop through the matrices and extract the value? Here's an example,
% Create the cell array
for iMatrix = 1:10
a{iMatrix} = rand(12, 13); % Each element of this cell array is a matrix
end
iRow = 5; iCol = 4; % Indices to the value to extract from each matrix
% Unsuccessful attempts
a{:}(iRow,iCol)
Expected one output from a curly brace or dot indexing expression, but there were 10 results.
a(:)(iRow,iCol)
Error: ()-indexing must appear last in an index expression.
a(iRow,iCol)
Index exceeds matrix dimensions.
0 commentaires
Réponse acceptée
Star Strider
le 18 Jan 2018
Use cellfun.
This seems to work:
% Create the cell array
for iMatrix = 1:10
DisplayMatrix = rand(12, 13)
a{iMatrix} = DisplayMatrix; % Each element of this cell array is a matrix
end
iRow = 5; iCol = 4; % Indices to the value to extract from each matrix
Extracted = cellfun(@(x) x(iRow,iCol), a) % Desired Result
2 commentaires
Plus de réponses (0)
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!