print {spam}

Printing and Summarizing Sparse Matrices

Description

Printing (non-zero elements) of sparse matrices and summarizing the sparsity structure thereof.

Usage

  ## S4 method for signature 'spam'
print(x, ...)
## S4 method for signature 'spam'
summary(object, ...)

Arguments

x

matrix of class spam or spam.chol.method.

object

matrix of class spam or spam.chol.method.

...

any other arguments passed to print.default. If the non-standard argument minimal is set to FALSE, an extended spam print is available with logical argument rowpointer to print rowpointers, and zerosymbol defining the character to display the zero element.

Details

getOption('spam.printsize') determines if the sparse matrix is coerced into a matrix and the printed as an array or if only the non-zero elements of the matrix are given.

Value

NULL for print, because the information is printed with cat there is no real need to pass any object back.
A list containing the non-zero elements and the density for summary for class spam.
A list containing the non-zero elements of the factor, the density and the fill-in for summary for class spam.chol.NgPeyton.

Author(s)

Reinhard Furrer

See Also

display or image for a graphical visualization; spam.options

Examples

set.seed(13)
smat <- spam_random(8)
par(mfcol=c(1,2),pty='s')
options(spam.printsize=1000)
print(smat)
options(spam.printsize=10)
print(smat)
summary(smat)
summary(smat)$nnz

smat@entries[1:5] <- 0
print(smat, minimal = FALSE)
print(smat, minimal = FALSE, rowpointer = TRUE)
smat@rowpointers
print_nnzpos(smat)