Function Generators for Interpolating Evaluation Curves

Usage

extractTrapezoidEval(x, xlim, invert = FALSE)

extractArbitraryCurveEval(
  x,
  resolution = 1000,
  method = "natural",
  invert = FALSE,
  bounded = TRUE
)

extractArbitraryLinearCurveEval(x, xlim = NULL, invert = FALSE)

extractSigmoidCurveEval(x, xlim, invert = FALSE)

extractLinearCurveEval(x, xlim = NULL, invert = FALSE)

extractCrispCurveEval(x, xlim, invert = FALSE)

extractBetaCurveEval(x, xlim, invert = FALSE)

extractGaussCurveEval(x, xlim, invert = FALSE)

extractTriangleCurveEval(x, xlim, invert = FALSE)

extractPICurveEval(x, xlim, invert = FALSE)

Arguments

x: evaluation XML content
xlim: domain points (see details)
invert: invert rating values? Default: FALSE
resolution: Number of segments to calculate spline points for, which are then interpolated with splinefun(). Used only for extractArbitraryCurveEval(). Default 1000
method: Passed to splinefun(). Used only for extractArbitraryCurveEval(). Default "natural"
bounded: Used only for extractArbitraryCurveEval(). Used to constrain spline results to [0,1]. Default TRUE

Details

Generally the xlim argument is a numeric vector of length two that refers to the upper and lower boundaries of the domain (property value range) of interest. In the case of extractTrapezoidEval() xlim is a vector of length 4 used to specify the x-axis position of left base, two upper "plateau" boundaries, and right base. For arbitrary linear curves, the xlim vector may be any length.