MATLAB: Help with matrix manipulation in matlab

arrayaveragematrixmatrix arrayvector

I have a matrix M with dimension 600×500. I want to do an average of its values along vertical direction, in order to have a matrix with smaller dimension. For example, I want to obtain a matrix with dimension 200×500: this means that, every three values along each column, I take just one (which is the average of the three values). How can I do this ? Thanks!

Best Answer

out = squeeze(mean(reshape(M,3,[],size(M,2))));

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MATLAB: Data manipulation

This is not so hard, and is a nice example of why MATLAB is so great for working with arrays.

% I'll make a random 143x143x143 matrix

M = randi([0 1],143,143,143,'uint8');

% Clip the dimensions to be even

S = size(M);
M2 = M(1:2*floor(S(1)/2) , 1:2*floor(S(2)/2), 1:2*floor(S(3)/2));

% Add everything in the z direction, and divide by 4.

M3 = sum(M2,3)/4;

%Do the averages

I = conv2(M3,[1 1; 1 1],'valid');

%Take every other row to get each 2x2 block

I = I(1:2:end,1:2:end);

%And "I" is the 71x71 matrix you were looking for!

MATLAB: Matrix manipulation

Just use [] for any column or row that you want to remove.

Eq :

A = round(10*rand(10));
B = A;
B(3, :) = []

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MATLAB: Data manipulation

MATLAB: Matrix manipulation

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