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Utility Function to Prepare Polynomial Fitted Edges of Trapezoid

Source: R/trapezoid_utilities.R
polynomial_coefficients.Rd

Called by optram_wetdry_coefficients to prepare second order polynomial curve along trapezoid edges Calculates six coefficients: intercept (alpha) of both wet and dry edges and first and second order coefficients (beta), as in \(STR = alpha + beta_1 * VI + beta_2 * VI^2\) and updates the edges data.frame with these polynomila values fitted values

Usage

polynomial_coefficients(df, output_dir)

Arguments

df,

data.frame, values of VI and STR along edges of trapezoid

output_dir,

string, path to save coefficients CSV file

Value

df, data.frame, the trapezoid line edge points with fitted values added for both wet and dry edges

Note

Three CSV files are saved:

  • the regressions coefficients,

  • the trapezoid edge points

  • RMSE of the fitted curve

Examples

if (FALSE) {
  df <- read.csv(system.file("extdata", "trapezoid_edges.csv",
                  package = "rOPTRAM"))
  output_dir <- tempdir()
  coeffs <- rOPTRAM::polynomial_coefficients(df, output_dir)
  coeffs
 }