photobiology (version 0.9.6)

valleys: Valleys or local minima

Description

Function that returns a subset of an R object with observations corresponding to local maxima.

Usage

valleys(x, span, ignore_threshold, strict, ...)

## S3 method for class 'default':
valleys(x, span, ignore_threshold, strict, ...)

## S3 method for class 'numeric':
valleys(x, span = 5, ignore_threshold, strict = TRUE, ...)

## S3 method for class 'generic_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, ...)

## S3 method for class 'source_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, unit.out = getOption("photobiology.radiation.unit", default
  = "energy"), ...)

## S3 method for class 'response_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, unit.out = getOption("photobiology.radiation.unit", default
  = "energy"), ...)

## S3 method for class 'filter_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, filter.qty = getOption("photobiology.filter.qty", default =
  "transmittance"), ...)

## S3 method for class 'reflector_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, ...)

## S3 method for class 'cps_spct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, ...)

## S3 method for class 'generic_mspct':
valleys(x, span = 5, ignore_threshold = 0,
  strict = TRUE, ...)

Arguments

x

an R object

span

a peak is defined as an element in a sequence which is greater than all other elements within a window of width span centered at that element. The default value is 3, meaning that a peak is bigger than both of its neighbors. Default: 3.

ignore_threshold

numeric value between 0.0 and 1.0 indicating the relative size compared to talelst peakthreshold below which valleys will be ignored.

strict

logical flag: if TRUE, an element must be strictly greater than all other values in its window to be considered a peak. Default: TRUE.

...

ignored

unit.out

character One of "energy" or "photon"

filter.qty

character One of "transmittance" or "absorbance"

Value

• a subset of x with rows corresponding to local maxima.

Methods (by class)

• default: Default function usable on numeric vectors.
• numeric: Default function usable on numeric vectors.
• generic_spct: Method for "generic_spct" objects.
• source_spct: Method for "source_spct" objects.
• response_spct: Method for "response_spct" objects.
• filter_spct: Method for "filter_spct" objects.
• reflector_spct: Method for "reflector_spct".
• cps_spct: Method for "cps_spct" objects.
• generic_mspct: Method for "generic_mspct" objects.

See Also

Other peaks and valleys functions: find_peaks, get_peaks, peaks

Examples

valleys(sun.spct)