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Extract matrices of a particular size

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ankit
ankit 2015-3-31
评论： Hamza Ahmed 2021-3-19
Suppose there a cell containing matrices of different sizes. How can I extract all the (1x16) matrices in the same order which was present in the cell and store them in a different cell?

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回答（3 个）

James Tursa
James Tursa 2015-3-31
编辑：James Tursa 2015-3-31
C = your cell array
DesiredSize = whatever; % e.g. [1 16]
Z = cellfun(@size,C,'UniformOutput',false); % get matrix sizes
X = cellfun(@isequal,Z,repmat({DesiredSize},size(Z))); % which ones match desired size
D = C(X); % Extract them into another cell array
  2 个评论
Michael Haderlein
Michael Haderlein 2015-3-31
In principle, yes, but it looks to me as if there's are more straight-forward way of getting X:
C={rand(3) rand(1,16) rand(1,9) rand(1,16)};
DesiredSize=[1 16];
X=cellfun(@(c) isequal(size(c),DesiredSize),C);
D=C(X);
Hamza Ahmed
Hamza Ahmed 2021-3-19
Hello i wanna loop through this
lets just say i have a 1*78 cell array and each cell has matrix of 2 columns but different number of rows my question is that how will I extract all the matrices which have number of rows greter then 2 from that cell array? any help in this regard will be much appreciated Thankyou

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Andrei Bobrov
Andrei Bobrov 2015-3-31
[a,b] = cellfun(@size,C);
out = C(ismember([a;b]',[1,16],'rows'));
ankit
ankit 2015-3-31
I tried
z=cellfun(@(x) length(x),new_cell); %displays the lengths of the matrices of the cell
pos=find(z==16);
now I can get positions of all the 1x16 matrices
  1 个评论
Andrei Bobrov
Andrei Bobrov 2015-3-31
No, e.g.:
>> C = {randi(20,4,4);randi(10,1,16);randi(20,1,16);randi(15,16,3)};
>> ii = cellfun(@length,C)
ii =
4
16
16
16
>>

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