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Display the pattern of non-zero entries of
a matrix of class matrix.csr
.
# S4 method for matrix.csr
image(x, col=c("white","gray"),
xlab="column", ylab="row", ...)
a matrix of class matrix.csr
.
a list of colors such as that generated by rainbow
.
Defaults to c("white","gray")
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)+2|row(A)
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