How to add together values in matrix and replace the empty spaces with zeroes
I have used a code that was written in someone elses previous question, that adds together all values over 0, after each zero. So if you had : [0 0 0 2 3 4 0 0 0 5 2 1], you would get [9 8] However, what i would want is this [ 0 0 0 0 0 9 0 0 0 0 0 8] So basically replacing the "open" spaces with a 0 Anyone know how i can achieve this?
Neeta Dsouza answered .
2025-11-20
T = [0 0 0 2 3 4 0 0 0 5 2 1]; % input data
T_out = zeros(size(T));
% find start and end indexes of groups of zeroes
id_nonzero = (T>eps);
[begin,ends] = find_start_end_group(id_nonzero);
% loop over this groupes
for k = 1:numel(begin)
start = begin(k); % start index of k th groups of non zero values
stop = ends(k); % end index of k th groups of non zero values
T_out(stop) = sum(T(start:stop));
end
T
T = 1×12
0 0 0 2 3 4 0 0 0 5 2 1
T_out
T_out = 1×12
0 0 0 0 0 9 0 0 0 0 0 8
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [begin,ends] = find_start_end_group(ind)
% This locates the beginning /ending points of data groups
% Important : ind must be a LOGICAL array
D = diff([0;ind(:);0]);
begin = find(D == 1);
ends = find(D == -1) - 1;
end