findFWHM

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Measures the FWHM of the specified (y vs. x) profile by removing half the maximum (or other specified fractional level) and using a spline fit to find the zero crossings. This works best on noise-free data. To operate on images instead, see getfwhm and getfwhm2.

Usage:

au.findFWHM(x, y, level=0.5, s=0)

• x: the position or frequency coordinate
• y: the intensity coordinate
• level: the relative level to find the full width of
• s: see help scipy.interpolate.UnivariateSpline

Example:

CASA <17>: au.findFWHM(range(-4,5,1),[0.1,0.15,0.3,0.7,0.95,0.8,0.4,0.3,0.2])
  Out[17]: 3.3083849908301022

-- ToddHunter - 2013-12-06