FitLeafArea {pvldcurve}

Leaf area fitting

Description

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.

Usage

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

Arguments

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"

Details

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

Value

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

Examples

# 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)