Matrix multiplication typically refers to an operation which yields a new matrix from a pair of matrices which are already known. This is normally covered in an Algebra class or textbook.
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Matrix multiplication is when you multiply the numbers inside different matricies.[topleft#1]Xtopleft#2=top left topright#1XBottomleft=top right bottom left X Topleft=top left bottom rightX bottom right=bottom right Scalar multiplication A number out side a matrix multiplies all parts of the matrix
Matrix arithmetic
All matrix multiplications are associative Always .. .A+
It is multiplication by the 2x2 matrix 0 1-1 0
The effect of the rotation is the same as that of a 90 degree clockwise rotation. In matrix notation, it is equivalent to [post-]multiplication by the 2x2 matrix: { 0 1 } {-1 0 }