RSurvey (version 0.6-0)

EvalFunction: Evaluates an RStatement

Description

Evaluates a character string representation of an Rstatement.

Usage

EvalFunction(txt, cols)

Arguments

txt

character; a string representation of an Rfunction; see Details.

cols

list; see ManageData.

Value

• The result of evaluating the txt object after the appropriate substitutions for DATA has been made. Inf, -Inf, and NaN values are converted to NA in numeric vectors.

Details

The DATA identifier is a reserved word within the txt argument. DATA is used to reference the data.raw data frame, a component of Data with variable names keyed to column index numbers in data.raw using the vars argument.

See Also

parse, eval, round, is.infinite, is.nan

Examples

data(tritest)
Data("data.raw", as.data.frame(tritest))
cols <- list()
cols[[1]] <- list(id = "X", index = 1, fun = "DATA[["X"]]")
cols[[2]] <- list(id = "Y", index = 2, fun = "DATA[["Y"]]")
EvalFunction("DATA[["X"]]", cols)
cols[[1]]$digits <- 0
EvalFunction("DATA[["X"]]", cols)
EvalFunction("DATA[["X"]] + DATA[["Y"]]", cols)
EvalFunction("rnorm(12)", cols)