smix: create a new weighted spectrum
In iona5/spectramix: Create new spectra from other spectra

create a new spectrum from numeric weights. the weights can add up to 1 or 100 indicating a plain factor or percentages. if they add up to some other value, indicate via normalize = TRUE, that you want a normalization.

1	smix(data, weights, normalize = FALSE)

`data`	a data frame containing the spectra to mix. it is assumed the first column contains the Wavelength labels
`weights`	a 2-col matrix of the spectra to mix. The first column is the column index of the spectrum in data, the second column is the weight of the spectrum
`normalize`	if the weights should be normalized