Matrix (version 0.999375-6)

drop0: Drop "Explicit Zeroes" from a Sparse Matrix

Description

Returns a sparse matrix with no explicit zeroes, i.e., all zero or FALSE entries are dropped from the explicitly indexed matrix entries.

Usage

drop0(x, clx = c(class(x)))

Arguments

x

a Matrix, typically sparse, i.e., inheriting from sparseMatrix.

clx

[optional:] the class or class definition (see getClassDef; it is of class classRepresentation<

Value

• a Matrix like x but with no explicit zeros, i.e., !any(x@x == 0), always inheriting from CsparseMatrix.

See Also

spMatrix, class sparseMatrix

Examples

m <- spMatrix(10,20, i= 1:8, j=2:9,
              x = c(0:2,3:-1))
m
drop0(m)