GetJManyColsByNames: GetJManyColsByNames

In jmatrix: Read from/Write to Disk Matrices with any Data Type in a Binary Format

GetJManyColsByNames

Description

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

Usage

GetJManyColsByNames(fname, extcolnames)

Arguments

fname	String with the file name that contains the binary data.
extcolnames	A vector of RStrings with the names of the columns to be extracted. If the binary file has no column names, or _any_ of the column names is not present, an empty matrix is returned.

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")
Rf[,c(1,4)]
vf<-GetJManyColsByNames(tmpfile1,c("a","d"))
vf

jmatrix documentation built on Oct. 9, 2023, 1:06 a.m.