which.in: [+] Get indices of certain matrix elements

In GegznaV/spMisc: Infix Operators, Convenience and Other Kind of Miscellaneous Functions

Description

Get indices of certain (e.g., diagonal) matrix elements. These elements can be in:

1. diag - diagonal;

2. offdiag - offdiagonal;

3. col - indicated columns;

4. row - indicated rows;

5. trilow - lower triangle (with or without diagonal);

6. triupp - upper triangle (with or without diagonal).

Usage

which.in(type, x, ...)

which.in.diag(x)

which.in.offdiag(x)

which.in.col(x, col)

which.in.row(x, row)

which.in.trilow(x, diag = FALSE)

which.in.triupp(x, diag = FALSE)

Arguments

type	Either diag, offdiag, col, row, trilow or triupp (just for which.in()).
x	A matrix or an object, which can be coerced to a marix.
...	Other appropriate parameters indicated below.
col	An index/Indices of columns that contain elements of interest.
row	An index/Indices of rows that contain elements of interest.
diag	logical. Should the diagonal be included?

Value

Indices of indicated elements of a matrix.

Author(s)

Vilmantas Gegzna

See Also

Other matrix operations in spMisc: corr_vec2mat(), indMatrix(), nTri2nDiag(), revalueMatrix(), sort_matrix_elements, which.max.all(), which.max.perRow()

Examples

m1 <- matrix(NA, 5, 5)
m1

 #>        [,1] [,2] [,3] [,4] [,5]
 #>  [1,]   NA   NA   NA   NA   NA
 #>  [2,]   NA   NA   NA   NA   NA
 #>  [3,]   NA   NA   NA   NA   NA
 #>  [4,]   NA   NA   NA   NA   NA
 #>  [5,]   NA   NA   NA   NA   NA

which.in.diag(m1)
 #>  [1]  1  7 13 19 25

m2 <- matrix(NA, 2, 5)
which.in.diag(m2)
 #>  [1]  1  4

#================================

 which.in(diag,    m1)
 which.in(offdiag, m1)

 which.in(col, m1, col = 2)
 which.in(row, m1, row = 2)

 which.in(trilow, m1)
 which.in(trilow, m1, diag = TRUE)

 which.in(triupp, m1)

GegznaV/spMisc documentation built on April 26, 2020, 5:59 p.m.