Perform AND operations with multiple matrices

5 views (last 30 days)
Hi all,
I am performing AND operations with multiple matrices, where I have a cell array M={1x3} containing three matrices of arbitrary dimensions, and a vector c=[1x3] containing three numbers. And with those I have to perform the below operation:
M = {rand(15), rand(15), rand(15)} ;
c = rand(1, 3) ;
i = find(M{1} == c(1) & M{2} == c(2) & M{3} == c(3)) ;
Since the second dimension of M and c are set to vary to any number (i.e. it could be 4,5,6, etc.), I was wondering wether there was a way to perform the AND (&) operation in a way which could account for the above, instead of manually ammending the code every time.
Thanks for your response in advance,
KMT.

Accepted Answer

Walter Roberson
Walter Roberson on 9 Apr 2020
Edited: Walter Roberson on 9 Apr 2020
M = {rand(15), rand(15), rand(15)} ;
c = rand(1, 3) ;
cc = num2cell(c);
fold(@and, cellfun(@(V,C) V == C, M, cc, 'uniform', 0))

More Answers (2)

Andrei Bobrov
Andrei Bobrov on 9 Apr 2020
i = find(all(cat(3,M{:}) == reshape(c,1,1,[]),3));

Alexandra McClernon Ownbey
Edited: Alexandra McClernon Ownbey on 9 Apr 2020
This may not be the most efficient way, but it works. I stored everything in a logical and then compared the k-dimension in that logical. I also modified to randi with a range just so I can test it
M = {randi([-1,1],15,15), randi([-1,1],15,15), randi([-1,1],15,15)} ;
c = randi(1, 3) ;
ix = false(length(M{1}(1,:)),length(M{1}(:,1)),length(c));
for j = 1:length(c)
ix(:,:,j) = M{j} == c(j);
end
[l,m,n] = size(ix);
k = 1;
for i = 1:l
for j = 1:m
if all(ix(i,j,:))
row(k) = i;
col(k) = j;
k = k+1;
end
end
end
the locations of where c = M are located in row and col.

Categories

Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!