iFit/laplace

 y = laplace(p, x, [y]) : Laplace distribution function. 

   iFunc/laplace Laplace distribution function. 
     y  = p(4)+ p(1)/2/p(3) .* exp( abs(x - p(2))/p(3) );

 laplace(width)          creates a model with a specified width
 laplace([ parameters ]) creates a model with specified model parameters

 input:  p: Laplace model parameters (double)
            p = [ Amplitude Center Width BackGround ]
          or 'guess'
         x: axis (double)
         y: when values are given and p='guess', a guess of the parameters is performed (double)
 output: y: model value
 ex:     y=laplace([1 0 1 1], -10:10); or plot(laplace);

 Version: Aug. 22, 2017
 See also iFunc, iFunc/fits, iFunc/plot
 (c) E.Farhi, ILL. License: EUPL.