sigm_fit

Versión 1.5.0.0 (4,11 KB) por R P
Optimization of parameters of the sigmoid function
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Actualizado 30 mar 2016

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Optimization of parameters of the sigmoid function

Syntax:
[param]=sigm_fit(x,y)

that is the same that
[param]=sigm_fit(x,y,[],[],[]) % no fixed_params, automatic initial_params

[param]=sigm_fit(x,y,fixed_params) % automatic initial_params
[param]=sigm_fit(x,y,[],initial_params) % use it when the estimation is poor
[param]=sigm_fit(x,y,fixed_params,initial_params,plot_flag)

param = [min, max, x50, slope]

if fixed_params=[NaN, NaN , NaN , NaN] % or fixed_params=[]
optimization of "min", "max", "x50" and "slope" (default)

if fixed_params=[0, 1 , NaN , NaN]
optimization of x50 and slope of a sigmoid of ranging from 0 to 1


Additional information in the second output, STAT
[param,stat]=sigm_fit(x,y,fixed_params,initial_params,plot_flag)


Example:
%% generate data vectors (x and y)
fsigm = @(param,xval) param(1)+(param(2)-param(1))./(1+10.^((param(3)-xval)*param(4)))
param=[0 1 5 1]; % "min", "max", "x50", "slope"
x=0:0.1:10;
y=fsigm(param,x) + 0.1*randn(size(x));

%% standard parameter estimation
[estimated_params]=sigm_fit(x,y)

%% parameter estimation with forced 0.5 fixed min
[estimated_params]=sigm_fit(x,y,[0.5 NaN NaN NaN])

%% parameter estimation without plotting
[estimated_params]=sigm_fit(x,y,[],[],0)

Citar como

R P (2024). sigm_fit (https://www.mathworks.com/matlabcentral/fileexchange/42641-sigm_fit), MATLAB Central File Exchange. Recuperado .

Compatibilidad con la versión de MATLAB
Se creó con R13
Compatible con cualquier versión
Compatibilidad con las plataformas
Windows macOS Linux
Categorías
Más información sobre Curve Fitting Toolbox en Help Center y MATLAB Answers.
Agradecimientos

Inspirado por: Sine function fit

Inspiración para: sigmoid, sigm_fit_val(param,x)

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Versión Publicado Notas de la versión
1.5.0.0

plot bug fixed
title update

1.4.0.0

minmax function used in plotting substituted by min and max functions

1.3.0.0

STAT output variable, with confidence intervals for parameters and distribution

1.0.0.0