read.matrix.csr

0th

Percentile

Read/Write Sparse Data

reads and writes a file in sparse data format.

Keywords
IO
Usage
read.matrix.csr(file, fac = TRUE, ncol = NULL)
write.matrix.csr(x, file = "out.dat", y = NULL, fac = TRUE)
Arguments
x

An object of class matrix.csr

y

A vector (either numeric or a factor)

file

The filename.

fac

If TRUE, the y-values (if any) are interpreted as factor levels.

ncol

Number of columns, detected automatically. Can be used to add empty columns (possibly not stored in the sparse format).

Value

If the data file includes no y variable, read.matrix.csr returns an object of class matrix.csr, else a list with components:

x

object of class matrix.csr

y

vector of numeric values or factor levels, depending on fac.

See Also

matrix.csr

Aliases
  • read.matrix.csr
  • write.matrix.csr
Examples
# NOT RUN {
library(methods)
if (require(SparseM)) {
    data(iris)
    x <- as.matrix(iris[,1:4])
    y <- iris[,5]
    xs <- as.matrix.csr(x)
    write.matrix.csr(xs, y = y, file = "iris.dat")
    xs2 <- read.matrix.csr("iris.dat")$x
    if (!all(as.matrix(xs) == as.matrix(xs2)))
        stop("Error: objects are not equal!")
}
# }
Documentation reproduced from package e1071, version 1.7-3, License: GPL-2 | GPL-3

Community examples

Looks like there are no examples yet.