display {spam}R Documentation

Graphially represent the nonzero entries

Description

The function represents the nonzero entries in a simple bicolor plot.

Usage

  display(x, ...)

Arguments

x matrix of class spam or spam.chol.NgPeyton.
... any other arguments passed to image.default/plot.

Details

spam.getOption('imagesize') determines if the sparse matrix is coerced into a matrix and the plotted with image.default or if the matrix is simply represented as a scatterplot with pch=".". The points are scaled according to cex*spam.getOption('cex')/(nrow+ncol). For some devices or for non-square matrices, cex needs probably some adjustment.

Author(s)

Reinhard Furrer

See Also

image, spam.options

Examples

set.seed(13)

nz <- 8
ln <- nz
smat <- spam(0,ln,ln)
smat[cbind(sample(ln,nz),sample(ln,nz))] <- 1:nz

par(mfcol=c(1,2),pty='s')
spam.options( imagesize=1000)
display(smat)
spam.options( imagesize=10)
display(smat)

# very large but very sparse matrix
nz <- 128
ln <- nz^2
smat <- spam(0,ln,ln)
smat[cbind(sample(ln,nz),sample(ln,nz))] <- 1:nz

par(mfcol=c(1,1),pty='s')
display(smat, cex=100)


[Package spam version 0.15-3 Index]