Addition in 3D matrix

Hello,

How can I sum in 3D using intervals;

example:

(62x50x341) 3d matrix

I want to add the following intervals in 3D:

Intervals; 8,30,31,31,30,31,30,31,31,28,31,29

is it possible to do it in a loop?

Thanks in advance

Answer 1

[the cyclist]

% Define some pretend data, the size of your original matrix
M = rand(62,50,341);

% Intervals
interval = [8,30,31,31,30,31,30,31,31,28,31,29];

% Get the sizes of M and intervals
[r,c,~] = size(M);
ni = length(interval);

% Calculate endpoints
endpoints = cumsum(interval);

% Calculate starting points
startpoints = [1 endpoints(1:end-1)+1];

% Preallocate an array for the summed intervals
output = zeros(r,c,ni); % Could also get these values from the sizes of the inputs

% Fill the output with the summed intervals
for ii = 1:ni
    output(:,:,ii) = sum(M(:,:,startpoints(ii):endpoints(ii)),3);
end

[Orlando Ramirez-Valle]

It worked !!!, I really appreciate your help. Thank you