Sum odd numbers in a matrix

Hello I'm a beginner and just going through some practice problems and I'm on one where I need to sum all the odd values in a matrix. Here's what I have so far.

It passes the first two of three tests, the first where x=[1], the second where x=[2 3 5 7 1 4], but failed when x=[2 3 5 7 1 4;9 1 5 8 3 2]. It failed test 2 when, on line 3, instead of putting length(x) I put x(end), and I'm not really sure why. Any help would be appreciated.

function y = oddsum(x)
  v=[];
  for i=1:length(x)
      g=x(i)
      if mod(g,2)==1
          v(i)=x(i);
      end
  end
  y = sum(v)
end

Answer 1

[madhan ravi]

v = zeros(size(x)); % good habit is to preallocate

change length to numel that’s why people recommend to use numel() took a while to debug

Whole code can be written as

Wanted = sum(x(mod(x,2) == 1), 'all')  % for versions < 2018b sum(sum(...))