efficient loop - finding min and max index of certain value
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I have an array that has for example the following structure:
ic = [ 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 ....... 60000 60000 60000]'
and i want to find the minimum and maximum index of every value in ic. I created the following loop, but it is rather slow:
min_idx = zeros(1, max(ic))';
max_idx = zeros(1, max(ic))';
for n=1:max(ic);
id = ic;
id == n;
idx = find(id);
min_id = min(idx); %should return the minimum index of every value in ic
max_id = max(idx); %should return the miximum index of every value in ic
min_idx(n) = min_id;
max_idx(n) = max_id;
end
With this code it takes around 320 sec to finish. How can this be made faster to run?
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