Matrix Multiplication Operator
DESCRIPTION:
Performs matrix multiplication on two conformable matrices.
USAGE: 
x %*% y
REQUIRED ARGUMENTS:
x,y:
matrix or vector, which is numeric or complex.
Missing values (NA) are allowed.
VALUE:
matrix which is the matrix product of x and y.
DETAILS:
Any computation involving a missing value will result in a missing value.

The last extent of x must be the same size as the first extent of y. Vectors are not oriented, therefore a vector of length n can multiply an n by n matrix on the left or right.

If neither x nor y are matrices, then the result of x %*% y will be a one by one matrix.

The expression x * y will perform element-wise multiplication, not matrix multiplication.

SEE ALSO:
matrix , outer , crossprod .
EXAMPLES: 
freeny.ls <- lsfit(freeny.x, freeny.y)
fit <- cbind(1, freeny.x) %*% freeny.ls$coef