get_peaks {photobiology} | R Documentation |
Get peaks and valleys in a spectrum
Description
These functions find peaks (local maxima) or valleys (local minima) in a spectrum, using a user selectable size threshold relative to the tallest peak (global maximum). This a wrapper built on top of function peaks from package splus2R.
Usage
get_peaks(
x,
y,
ignore_threshold = 0,
span = 5,
strict = TRUE,
x_unit = "",
x_digits = 3,
na.rm = FALSE
)
get_valleys(
x,
y,
ignore_threshold = 0,
span = 5,
strict = TRUE,
x_unit = "",
x_digits = 3,
na.rm = FALSE
)
Arguments
x |
numeric |
y |
numeric |
ignore_threshold |
numeric Value between 0.0 and 1.0 indicating the relative size compared to tallest peak threshold below which peaks will be ignored. Negative values set a threshold so that the tallest peaks are ignored, instead of the shortest. |
span |
integer A peak is defined as an element in a sequence which is
greater than all other elements within a window of width |
strict |
logical If |
x_unit |
character Vector of texts to be pasted at end of labels built from x value at peaks. |
x_digits |
numeric Number of significant digits in wavelength label. |
na.rm |
logical indicating whether |
Value
A data frame with variables w.length and s.irrad with their values at the peaks or valleys plus a character variable of labels.
See Also
Other peaks and valleys functions:
find_peaks()
,
find_spikes()
,
peaks()
,
replace_bad_pixs()
,
spikes()
,
valleys()
,
wls_at_target()
Examples
with(sun.spct, get_peaks(w.length, s.e.irrad))
with(sun.spct, get_valleys(w.length, s.e.irrad))