morphDF: Morph dataframes

In soundgen: Sound Synthesis and Acoustic Analysis

Morph dataframes

Description

Internal soundgen function.

Usage

morphDF(
  a,
  b,
  nMorphs = 5,
  method = c("smooth", "perAnchor")[2],
  lenSmooth = 50,
  matchIdx = NULL,
  plot = F,
  ...
)

Arguments

a, b	dataframes to morph
nMorphs	length of morphing sequence
method	morphing method. 'smooth' equalizes contour lengths and takes a weighted mean. 'perAnchor' is a more sophisticated algorithm that attempts to match individual anchors
lenSmooth	the length of curves generated from anchors prior to averaging (only applicable if method is 'smooth')
matchIdx	manual override of anchor matching: if you have a better idea of which anchors should morph into each other, specify
plot	if TRUE, plots the morphing sequence of anchors
...	other graphical pars passed on to plot

Details

Morphs two dataframes of anchors, with two columns and at least two rows in each.

Value

A list of length nMorphs containing anchor dataframes for morphing

Examples

a = data.frame(time=c(0, .2, .9, 1), value=c(100, 110, 180, 110))
b = data.frame(time=c(0, .3, .5, .8, 1), value=c(300, 220, 190, 400, 350))
plot (a, type = 'b', ylim = c(0, 500))
points (b, type = 'b', col = 'blue')
m = soundgen:::morphDF(a, b, nMorphs = 15, method = 'smooth', plot = TRUE)
m = soundgen:::morphDF(a, b, nMorphs = 15, method = 'perAnchor', plot = TRUE)

m = soundgen:::morphDF(a = data.frame(time = c(0, 1), freq = c(700, 700)),
                       b = data.frame(time = c(0, 1), freq = c(400, 600)),
                       nMorphs = 5, method = 'perAnchor', plot = TRUE)
m = soundgen:::morphDF(a = data.frame(time = c(-30, 120, 350), value = c(-120, 10, -120)),
                       b = data.frame(time = c(50, 500), value = c(0, -30)),
                       nMorphs = 10, method = 'perAnchor', plot = TRUE)
m = soundgen:::morphDF(a = data.frame(time = c(-50, 1214), value = c(-50, -70)),
                       b = data.frame(time = c(0, 49, 256), value = c(-120, 10, -120)),
                       nMorphs = 8, method = 'perAnchor', plot = TRUE)

soundgen documentation built on Sept. 29, 2023, 5:09 p.m.