SparseM.image

0th

Percentile

Image Plot for Sparse Matrices

Display the pattern of non-zero entries of a matrix of class matrix.csr.

Keywords
hplot, algebra
Usage
# S4 method for matrix.csr
image(x, col=c("white","gray"),
      xlab="column", ylab="row", …)
Arguments
x

a matrix of class matrix.csr.

col

a list of colors such as that generated by rainbow. Defaults to c("white","gray")

xlab,ylab

each a character string giving the labels for the x and y axis.

additional arguments.

Details

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.

References

Koenker, R and Ng, P. (2002). SparseM: A Sparse Matrix Package for R, http://www.econ.uiuc.edu/~roger/research

See Also

SparseM.ops, SparseM.solve, SparseM.ontology

Aliases
  • image
  • SparseM.image
  • image,matrix.csr-method
Examples
# NOT RUN {
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)))
# }
Documentation reproduced from package SparseM, version 1.78, License: GPL (>= 2)

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