selectzerorows_byname: Select zero rows

In matsbyname: An Implementation of Matrix Mathematics that Respects Row and Column Names

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)

matsbyname documentation built on May 29, 2024, 8:10 a.m.