## HandandBeak

### Vector Graphic Design     # How Do I Multiply A X Matrix By A X Matrix

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We call the number (2 in this case) a scalar so this is called scalar multiplication. Multiplying a Matrix by Another Matrix. But to multiply a matrix by another matrix we need to do the dot product of rows and columns what does that meanMatrix-vector product. To define multiplication between a matrix A and a vector vcx (i.e. the matrix-vector product) we need to view the vector as a column Multiplying a Vector by a Matrix To multiply a row vector by a column vector the row vector must have as many columns as the column vector has rows. Let us define the multiplication between a matrix A and a vector x in which the number of columns in A equals the number of rows in x .

Matrix multiplication is not universally commutative for nonscalar inputs. That is AB is typically not equal to BA . If at least one input is scalar then AB is equivavectort to A.B and is commutative.So matrix E times matrix D which is equal to-- matrix E is all of this business. So it is 0 3 5 5 5 2 times matrix D which is all of this. So were going to multiply it times 3 3 4 4 negative 2 negative 2. Now the first thing that we have to check is whether this is even a valid operation. Now the matrix multiplication is a human-defined operation that just happens-- in fact all Scalar multiplication is easy. Matrix multiplication however is quite another story. In fact its a royal pain. Your text probably gave you a complex formula for the process and that formula probably didnt make any sense to you.

Yes it wll give you a 2xx1 matrix Explanation When you consider the order of the matrices involved in a multiplication you look at the digits at the extremes to see the order of the result.Stack Exchange network consists of 175 Q&A communities including Stack Overflow the largest most trusted online community for developers to learn share their knowledge and build their careers.