%求矩陣c1和c2的每個元素的乘積
function  out=mul_c(c1,c2)

[row,col]=size(c1);
c(row,col)=0;
for irow=1:row
    for jcol=1:col
        c(irow,jcol)=c1(irow,jcol)*c2(irow,jcol);
    end
end
out=c;