rgr (version 1.0.4)

gx.subset: Extracts a Subset of Rows from a Dataframe

Description

The function extracts a subset of rows from a dataframe and returns the subset as a new dataframe based on the criterion provided by the user. Unused factor names are dropped.

Usage

gx.subset(dfname, subset = TRUE)

Arguments

dfname

name of the dataframe from which rows are to be extracted.

subset

the criterion for selecting the subset (rows).

Value

• data
  a dataframe only containing the rows of the input dataframe where the criterion is met.

Details

The subset criterion can be complex and be a combination of conditions, see Examples below.

Examples

## Make test data available
data(kola.c)

## Make a subset of the data for Finland
finland.c <- gx.subset(kola.c, COUNTRY == "FIN")

## Make a subset of the data for rock type, LITHO, 82 occurring
## in Russia. Note that both COUNTRY and LITHO are factor variables 
russia.82 <- gx.subset(kola.c, COUNTRY == "RUS" & LITHO == 82)

## Make a subset of the data for Cu exceeding 50(ppm) in Norway
norway.cugt50 <- gx.subset(kola.c, COUNTRY == "NOR" & Cu >50)