User defined minimum Function

How to create user defined function to create a vector of minimum values column wise from the input array argument?

Answer 1

[Image Analyst]

Try this:

function colMins = GetColumnMins(m)  % m is a matrix
colMins = min(m, [], 1);

You can rename GetColumnMins, m, and colMins to (almost) whatever you want.

Answer 2

[Walter Roberson]

function mins = column_minima(input_array)
  while any(any(diff(input_array,1,1) < 0))
      input_array = shuffle_array(input_array);
  end
  mins = input_array(1,:);
    function input_array = shuffle_array(input_array)
        for col = 1 : size(input_array, 2)
            input_array(:,col) = input_array( randperm(size(input_array,1)), col);
        end
    end
end

... confirmed working for 4 x 4 array.

[Walter Roberson]

Reference: https://en.wikipedia.org/wiki/Bogosort

Answer 3

[Mostafa]

how can i create a function to calculate the minimum value at an array?

[Image Analyst]

function result = MyMin(array)
result = min(array(:));

MATLAB Academy - Free 2 hour training

[Walter Roberson]

My code above https://www.mathworks.com/matlabcentral/answers/462749-user-defined-minimum-function#answer_375560 calculates the minimum column-by-column value of arrays without using any built-in minimum function. It uses one of the official recognized sorting algorithms: https://en.wikipedia.org/wiki/Bogosort