gx.sort: Function to Single Column Sort a Matrix or Data Frame

In rgr: Applied Geochemistry EDA

Description

Function to sort a matrix or data frame by the value in a column. On exit the function displays the sorted data. Any NAs in the sort column are sorted to beyond the greatest value. If the function is run as temp <- gx.sort(x, ncol) the sorted data are not displayed, but retained in temp for subsequent use or display.

Usage

gx.sort(x, col = 1, reverse = FALSE)

Arguments

x	the matrix or data frame to be sorted.
col	a column number, the value of which will be used to sort the matrix or data frame
reverse	the default is to sort in ascending order of the value in column col. If a descending order sort is required, set reverse = TRUE.

Author(s)

Robert G. Garrett

See Also

gx.sort.df

Examples

## Make test data available
data(sind)
attach(sind)

## Sort data frame sind into ascending order on the value
## of column 4, Zn
gx.sort(sind, 4)

## Sort data frame sind into descending order on the value
## of column 4, Zn
gx.sort(sind, 4, reverse = TRUE)

## Sort only the geochemical data in data frame sind into
## descending order on the value of column 4, Zn.  Note
## that sind[, -c(1:3)] moves the old column 4 to
## position 1
gx.sort(sind[, -c(1:3)], 1, reverse = TRUE)

## Detach test data
detach(sind)

rgr documentation built on May 2, 2019, 6:09 a.m.