Modify the given Matlab code to be a "while" loop that starts at first row and first column will compute the row echelon form(not reduced). Thank you.

%Gauss elimination method [m,n)=size(a); [m,n]=size(a); for j=1:m-1 for z=2:m if a(j,j)==0 t=a(j,:);a(j,:)=a(z,:); a(z,:)=t; end end for i=j+1:m a(i,:)=a(i,:)-a(j,:)*(a(i,j)/a(j,j)); end end x=zeros(1,m); for s=m:-1:1 c=0; for k=2:m c=c+a(s,k)*x(k); end x(s)=(a(s,n)-c)/a(s,s); end