Image Plot for Sparse Matrices
Display the pattern of non-zero entries of
a matrix of class matrix.csr.
## S4 method for signature 'matrix.csr'
image(x, col=c("white","gray"),
xlab="column", ylab="row", ...)x |
a matrix of class |
col |
a list of colors such as that generated by |
xlab,ylab |
each a character string giving the labels for the x and y axis. |
... |
additional arguments. |
The pattern of the non-zero entries of a sparse matrix is displayed. By default nonzero entries of the matrix appear as gray blocks and zero entries as white background.
Koenker, R and Ng, P. (2002).
SparseM: A Sparse Matrix Package for R,
http://www.econ.uiuc.edu/~roger/research/home.html
SparseM.ops,
SparseM.solve,
SparseM.ontology
a <- rnorm(20*5) A <- matrix(a,20,5) A[row(A)>col(A)+4|row(A)<col(A)+3] <- 0 b <- rnorm(20*5) B <- matrix(b,20,5) B[row(A)>col(A)+2|row(A)<col(A)+2] <- 0 image(as.matrix.csr(A)%*%as.matrix.csr(t(B)))
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