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Problem 1.4. Write a function named istref that returns 1 if the input matrix is in reduced row echelon form and 0 if it is not. Note that for all but the last assessment pretest is available. That is, you can check that your function produces the correct results before submitting your solutions. N.B. Once your click submit your solution is final and no further corrections are possible. Function Save Reset MATLAB Documentation 2 1 function result = isrref(A) result = 1; % assume A is rref until determined otherwise [m n] = size(A); previousleadingzeros = -1; 3 4 5 6 for row=1:m 7 8 % Determines the number of leading zeros in the row leadingzeros - @; 9 10 11 12 for col-1:n if A(row,col) break; ve 13 % Makes appropriate tests if row has pivot if leadingzeros