crossprod: Matrix Crossproduct

Description

Compute the matrix cross-product of a sparse and a dense or sparse matrix.

Usage

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Arguments

x, y

a matrix in simple_triplet_matrix-form and/or a dense matrix, where one must be of the form indicated by the suffix.

Details

Function tcrossprod_simple_triplet_matrix implements fast computation of x %*% t(x) and x %*% t(y) (tcrossprod). The remaining functions are (optimized) wrappers.

Value

A double matrix, with appropriate dimnames taken from x and y.

Note

The computation is delegated to tcrossprod if y (or x if y == NULL) contains any of the special values NA, NaN, or Inf.

Author(s)

Christian Buchta

See Also

crossprod for dense-on-dense computations.

Examples

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Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

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