Module moments

Compute the moments of a line profile.

Functions

moments(velo, flux, SNR=200., max_mom=3)
Compute the moments from a line profile.

source code

[max_mom x array],[max_mom x array]

moments_fromfiles(filelist, read_func, max_mom=3, **kwargs)
Compute the moments from a list of files containg line profiles.

source code

velo,av_prof,fluxes

profiles_fromfiles(filelist, read_func, max_mom=3, **kwargs)
Compute an average profile from a file list of profiles.

source code

Function Details

Compute the moments from a list of files containg line profiles.

The read_func should return 2 arrays and a float, representing velocities, normalised fluxes and the SNR of the line profile.

m0: equivalent width m1: radial velocity m2: variance m3: skewness

Parameters:

filelist (list of strings) - list of filenames
read_func (Python function) - function which reads in a file and returns velocities (array), the line profile (array) and the SNR of the whole profile (float)
max_mom (integer) - maximum moment to compute

Returns: [max_mom x array],[max_mom x array]

a list containg the moments and a list containing the errors

Compute an average profile from a file list of profiles.

The read_func should return 2 arrays and a float, representing velocities, normalised fluxes and the SNR of the line profile.

m0: equivalent width m1: radial velocity m2: variance m3: skewness

Parameters:

filelist (list of strings) - list of filenames
read_func (Python function) - function which reads in a file and returns velocities (array), the line profile (array) and the SNR of the whole profile (float)
max_mom (integer) - maximum moment to compute

Returns: velo,av_prof,fluxes

a list containg the moments and a list containing the errors