flu
wl2i (flu, 405 : 407)
wl2i (flu, 405 ~ 407)
## beginning of the spectrum to 407 nm
wl2i (flu, min ~ 407)
## 2 data points from the beginning of the spectrum to 407 nm
wl2i (flu, min + 2i ~ 407)
## the first 3 data points
wl2i (flu, min ~ min + 2i)
## from 490 nm to end of the spectrum
wl2i (flu, 490 ~ max)
## the last 8 data points
wl2i (flu, max - 7i ~ max)
## get 450 nm +- 3 data points
wl2i (flu, 450 - 3i ~ 450 + 3i)
wl2i (flu, 300 : 400) ## all NA:
wl2i (flu, 600 ~ 700) ## NULL: completely outside flu's wavelength range
i2wl (chondro, 17:20)
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