coordTransform {dMod}

Coordinate transformation for data frames

Description

Applies a symbolically defined transformation to the value column of a data frame. Additionally, if a sigma column is present, those values are transformed according to Gaussian error propagation.

Usage

coordTransform(data, transformations)

Arguments

data

data frame with at least columns "name" (character) and "value" (numeric). Can optionally contain a column "sigma" (numeric).

transformations

character (the transformation) or named list of characters. In this case, the list names must be a subset of those contained in the "name" column.

Value

The data frame with the transformed values and sigma uncertainties.

Examples

mydata1 <- data.frame(name = c("A", "B"), time = 0:5, value = 0:5, sigma = .1)
coordTransform(mydata1, "log(value)")
coordTransform(mydata1, list(A = "exp(value)", B = "sqrt(value)"))