Create a MATLAB function (expmat) that accepts as input arguments a matrix mat and two positive integers k and 12. The function calculates and returns:
An integer res1 that will be 1 if the elements of mat less than or equal to 12 are more than half, or if they are exactly equal, or 1 if less than half.
A res2 matrix that will have the same number of rows as the original mat but half the columns. The elements of each column of res2 will be the elements of the odd column of mat minus the elements of the even column of mat (e.g., 2nd column - 1st column, 4th column - 3rd column, etc.) (assume that the mat has an even number of columns).
A matrix res3 which will have the same elements as the original mat except that belong to a column greater than k and are redundant, which will become zero.