Using arrayfun on 2d matrix

for i = 1:D
  Xtr = arrayfun(@(x) binarize(x, threshold), Xtrn(:, i));
end
Xtrn is a MxD matrix
Xtr is a MxD matrix

Can we vectorize this loop as well?

This is what binarize does

function X = binarize(X, threshold)
  if(X<threshold)
  X = 0;
  else
  X = 1;
  end
end

Answer 1

[Walter Roberson]

You are overwriting all of Xtr in each iteration of i

You probably just want

Xtr = binarize(Xtrn, threshold)

with

function b = binarize(X, threshold)
  b = X >= threshold;