display {spam} | R Documentation |
The function represents the nonzero entries in a simple bicolor plot.
display(x, ...)
x |
matrix of class |
... |
any other arguments passed
to |
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.
Reinhard Furrer
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') options(spam.imagesize = 1000) display(smat) options(spam.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)