A good answer might be:
Probably you came up with the correct answer:
Probably you came up with the correct answer:
The Matrix-column matrix product is done by forming the dot product of the column matrix with each row of the matrix. Of course, the dimensions of each operand have to allow for this. It helps to flip the column matrix so that its elements align with the elements of the matrix:
Here is another example, with the result not yet quite complete:
Mentally flip (transpose) the column matrix and compute the result.