GetJManyCols {jmatrix}

GetJManyCols

Description

Returns (as a R numeric matrix) the columns with the requested column numbers from the matrix contained in a jmatrix binary file

Usage

GetJManyCols(fname, extcols)

Arguments

fname

String with the file name that contains the binary data.

extcols

A numeric vector with the indexes of the columns to be extracted, in R-numbering (from 1)

Value

A numeric matrix with the values of elements in the requested columns

Examples

Rf <- matrix(runif(48),nrow=6)
rownames(Rf) <- c("A","B","C","D","E","F")
colnames(Rf) <- c("a","b","c","d","e","f","g","h")
tmpfile1=paste0(tempdir(),"/Rfullfloat.bin")
JWriteBin(Rf,tmpfile1,dtype="float",dmtype="full",comment="Full matrix of floats")
vc<-GetJManyCols(tmpfile1,c(1,4))
vc