y = poisson(p, x, [y]) : Poisson distribution function.
iFunc/poisson Poisson distribution function.
y = p(3)+ p(1)*(exp(-p(2)).*(p(2).^x))./factorial(floor(x));
valid with integer axis values
poisson(centre) creates a model with a specified centre
poisson([ parameters ]) creates a model with specified model parameters
input: p: Poisson model parameters (double)
p = [ Amplitude Center BackGround ]
or action e.g. 'identify', 'guess', 'plot' (char)
x: axis (integers)
y: when values are given, a guess of the parameters is performed (double)
output: y: model value or information structure (guess, identify)
ex: y=poisson([1 0 1 1], -10:10); or plot(poisson);
Version: Aug. 22, 2017
See also iFunc, iFunc/fits, iFunc/plot
(c) E.Farhi, ILL. License: EUPL.