Column and row-wise products {Rfast}

Column and row-wise products

Description

Column and row-wise products.

Usage

colprods(x, method = "direct")
rowprods(x)

Arguments

x

A matrix with numbers.

method

The type of colCumProds to use. For direct multiplication use "direct" or "expsumlog" for a more numerically stable, but slower way.

Details

The product of the numbers in a matrix is returned either column-wise or row-wise.

Value

A vector with the column or the row products.

Author(s)

Manos Papadakis

R implementation and documentation: Manos Papadakis <[e-mail]>.

See Also

colsums, coldiffs, colMedians

Examples

x <- matrix( runif(100 * 10), ncol = 10 )
res<-colprods(x)
res<-rowprods(x)

x<-NULL