FitLeafArea: Leaf area fitting
In pvldcurve: Simplifies the Analysis of Pressure Volume and Leaf Drying Curves

Description Usage Arguments Details Value Examples

Fits randomly measured leaf area values linearly to fresh weight values. Useful if the leaf area changes during a measurement series but is only randomly measured.

1 2	FitLeafArea(data, sample = "sample", fresh.weight = "fresh.weight", leaf.area = "leaf.area")

`data`	data frame, with columns of equal length, containing at least columns with the the fresh.weight (g) and the leaf.area (cm^2) values, ordered by sample by descending fresh weight. A column containing the sample IDs is optionally required if several samples were measured.At least 3 leaf area values are required.
`sample`	string, optional name of the column in data containing the sample ID, default: "sample"
`fresh.weight`	optional name of the column in data containing the numeric fresh weight values (g); default: "fresh.weight"
`leaf.area`	optional name of the column in data containing the numeric single-sided leaf area values (cm^2); default: "leaf.area"

fits given leaf area values linearly to the respective fresh weight values and calculates leaf area values for the fresh weight values based on the fit

the original data frame extended by a numeric column containing the fitted leaf area values (leaf.area.fitted)

# get example data
df <- data.frame(
  sample = c(as.integer(rep(1, times = 6))),
  fresh.weight = c(1.23, 1.19, 1.15, 1.12, 1.09, 1.0),
  leaf.area = c(10.5, NA, NA, 9.8, NA, 8.4))
# fit leaf area
df_new <- FitLeafArea(df)