R: Column-wise differences

Column-wise differences {Rfast} | R Documentation

## Column-wise differences

### Description

Column-wise differences.

### Usage

    coldiffs(x)

### Arguments

`x` | A matrix with numbers.

### Details

This function simply does this function x[, -1] - x[, -k], where k is the last column of the matrix x. But it does it a lot faster. That is, 2nd column - 1st column, 3rd column - 2nd column, and so on.

### Value

A matrix with one column less containing the differences between the successive columns.

### Author(s)

Manos Papadakis

R implementation and documentation: Manos Papadakis <papadakm95@gmail.com>.

### See Also

`Dist, dista, colmeans`

### Examples

    x <- matrix( rnorm(50 * 10), ncol = 10 )
    res<-coldiffs(x)

    x<-NULL

[Package Rfast version 2.0.0 Index]