submatrix: Sub-matrix

In Rfast: A Collection of Efficient and Extremely Fast R Functions

Sub-matrix

Description

Sub-matrix.

Usage

submatrix(x,rowStart=1,rowEnd=1,colStart=1,colEnd=1)

Arguments

x	A Matrix, List, Dataframe or Vector.
rowStart	Start of the row.
rowEnd	End of the row.
colStart	Start of the col.
colEnd	End of the col.

Value

sub matrix like R's, x[startrow:endrow,startcol:endcol]. Fast especially for big sub matrices.

Author(s)

Manos Papadakis

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

See Also

Match, mvbetas, correls, univglms, colsums, colVars

Examples

x <- matrix( rnorm(100 * 100), ncol = 100 )
res<-submatrix(x,1,50,1,25) # x[1:50,1:25]

x<-NULL

Rfast documentation built on Nov. 9, 2023, 5:06 p.m.