How to reference values in cell array containing matrices

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KAE
KAE el 18 de En. de 2018
Comentada: Star Strider el 18 de En. de 2018
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.

Respuesta aceptada

Star Strider
Star Strider el 18 de En. de 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

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