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.
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
)
A data frame with variables w.length and s.irrad with their values at the peaks or valleys plus a character variable of labels.
numeric
numeric
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.
integer 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. Use NULL
for the global peak.
logical If TRUE
, an element must be strictly greater
than all other values in its window to be considered a peak.
character Vector of texts to be pasted at end of labels built from x value at peaks.
numeric Number of significant digits in wavelength label.
logical indicating whether NA
values should be stripped
before searching for peaks.
Other peaks and valleys functions:
find_peaks()
,
find_spikes()
,
peaks()
,
replace_bad_pixs()
,
spikes()
,
valleys()
,
wls_at_target()
with(sun.spct, get_peaks(w.length, s.e.irrad))
with(sun.spct, get_valleys(w.length, s.e.irrad))
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