spec.arith: Arithmetic operations on spectra
In oczoske/slacR: R-package to measure v and sigma from VIMOS IFU cubes

Description Usage Arguments Value Author(s)

The functions perform the elementary arithmetic operations on the flux values of spectra. If s2 is a spectrum sampled on a different wavelength vector than s1, it is first resampled. If s2 is a numeric vector, it must have the same length as s1.

spadd(s1, s2)
spsub(s1, s2)
spmult(s1, s2)
spdiv(s1, s2)
sarith(s1, s2, op)

`s1`	object of class `spectrum` with components `lambda`, `value` and optionally `noise`, `contsub` and `mask`
`s2`	object of class `spectrum`, a number or a numerical vector of the same length as the `value` component of `s1`
`op`	One of '+', '-', '*', '/'.

an object of class spectrum, sampled on the same wavelength vector as s1

When adding or subtracting spectra, their noise vectors are added quadratically. If s2 is a number, the noise vector of s1 is unchanged.

When multiplying or dividing spectra, the noise vector of s1 is scaled by the value of s2. This is appropriate if s2 is some wavelength-dependent scaling (like a transmission curve), but it is not fully general!

Oliver Czoske

oczoske/slacR documentation built on May 20, 2019, 8:23 p.m.