(Matrix A has M*L elements and matrix B has L*N elements, so matrix C=A*B has M*N elements). Matrix C (I = 1, 2, ..., m; j= 1，2，…，n)

For i = 0 to m

For j = 0 to n

c(i，j) = 0

For k = 0 to l

c(i，j) = c(i，j) + a(i，k) * b(k，j)

Next k

Next J.

Next, I

Graphic transformation can be performed by multiplying the coordinate vector of each point by various transformation matrices, specifically

http://www-scf.usc.edu/~flv/ipbook/chap02.htm

Transposed, if a is a square matrix, you can directly exchange the corresponding elements in turn. If not, a matrix B must be redefined. The number of rows and columns is exactly the transposition of a matrix, and then the values are assigned one by one.

Dim m = UBound(A， 1)-LBound(A， 1)

Dim n = UBound(A，2)-LBound(A，2)

Dim B () is double precision.

ReDim B(n，m)

For i = 0 to m

For j = 0 to n

B(j，i) = A(i，j)

Next J.

Next, I