selectzerorows_byname {matsbyname} | R Documentation |
Select zero rows
Description
Matrices with rows containing all zeroes are not invertible (singular). To diagnose this problem, it is useful to find the zero rows of a singular matrix. This function selects (extracts) only the zero rows of a matrix.
Usage
selectzerorows_byname(a, tol = 1e-06)
Arguments
a |
A matrix or a list of matrices. |
tol |
The allowable deviation from 0 for any element. |
Details
A row is said to be a zero row if all elements are within tol
of zero.
Value
a
with only zero rows selected.
Examples
m <- matrix(c(0, 0, 1,
0, 0, 0),
dimnames = list(c("r1", "r2"), c("c1", "c2", "c3")),
nrow = 2, ncol = 3, byrow = TRUE) %>%
setrowtype("rows") %>% setcoltype("cols")
m
selectzerorows_byname(m)
[Package matsbyname version 0.6.10 Index]