y=Ax (A∈R",x∈R” fori=1tom/i-j循环 for j=1 to n y(i)=y(i)+A(i,j)*x(j) end for end for forj=1ton/j-i循环 for i=1 to m y(i)=y(i)+A(i,j)*x(j) end for end for y Ax = ( , ) m n n A x × ∈ ∈   for i=1 to m // i-j 循环 for j=1 to n y(i)=y(i)+A(i,j)*x(j) end for end for for j=1 to n // j-i 循环 for i=1 to m y(i)=y(i)+A(i,j)*x(j) end for end for