pairwise_Schur_product {MESS} | R Documentation |
Compute Schur products (element-wise) of all pairwise combinations of columns in matrix
Description
Fast computation of all pairwise element-wise column products of a matrix.
Usage
pairwise_Schur_product(x, self = FALSE)
Arguments
x |
A matrix with dimensions r*c. |
self |
A logical that determines whether a column should also be multiplied by itself. |
Details
Note that the output order of columns corresponds to the order of the columns in x. First column 1 is multiplied with each of the other columns, then column 2 with the remaining columns etc.
Value
A matrix with the same number of rows as x and a number of columns corresponding to c choose 2 (+ c if self is TRUE), where c is the number of columns of x.
Author(s)
Claus Ekstrom <claus@rprimer.dk>
Examples
X <- cbind(rep(1, 4), 1:4, 4:1)
pairwise_Schur_product(X)
pairwise_Schur_product(X, self=TRUE)
[Package MESS version 0.5.12 Index]