gasanalyzer (version 0.4.3)

var2label: Render gasanalyzer variables or values using mathematical notation.

Description

The argument is converted to a plotmath expression that can be used using plot or ggplot2. If there is no known plotmath expression defined, the argument is returned as is.

Usage

var2label(varname, use_units = FALSE, val = NULL, ...)

Value

a list of plotmath expressions.

Arguments

varname

a character list or vector argument with variable names.

use_units

whether or not to append default units to the resulting. expression. It is better to rely on the units in the actual data, which is handled automatically by newer ggplot2 versions.

val

a value to display rather than the variable name. Needs to be of the same length as varname and if not a character vector it should be coercible to one. NAs are replaced with the plotmath expressions.

...

options passed on to make_unit_label.

See Also

plotmath

Examples

# make labels
lbls <- var2label(c("GasEx.Ci", "GasEx.A"), use_units = TRUE)
print(lbls)

# plot
plot(1, type = "n", xlab = lbls[[1]], ylab = lbls[[2]])
# add temperature as title, removing [] from the units:
title(main = var2label("Meas.Tleaf",use_units = TRUE, val = 25,
  group = c("", ""))[[1]])