.BG
.FN crossprod
.TL
Matrix Cross Product Operator
.CS
crossprod(mat1, mat2)
.AG mat1,mat2
matrix or vector, numeric or complex.
If `mat2' is omitted, it defaults to `mat1'.
.RT
matrix representing the cross product of `mat1' and `mat2',
defined as `t(mat1) %*% mat2', where `%*%' is matrix
multiplication and `t' is transposition.
Thus the `[i,j]'th element of the result is `sum(mat1[,i]*mat2[,j])'.
.KW algebra
.KW array
.WR
