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Reverse Subset Row

Source: R/RcppExports.R
rev_row_subset.Rd

Subsets the row by going from high indices to low (the reverse of the supported practice)

Usage

rev_row_subset(x, start, end)

Arguments

x

A matrix of dimensions M x N

start

A unsigned int that indicates the starting row.

end

A unsigned int that indicates the ending row.

Value

x A matrix with matrix rows displayed in reversed order

Details

Consider a vector x=[[1,2],[3,4]], the function would output x=[[3,4],[1,2]]. Start and end must be valid C++ matrix locations. (e.g. matrix rows start at 0 and not 1)

Author

JJB

Examples

x = matrix(c(1,2,3,4), nrow=2,byrow=TRUE)
rev_row_subset(x, 1, 0)
#>      [,1] [,2]
#> [1,]    3    4
#> [2,]    1    2