MATLAB CURVE FITTING TOOLBOX - RELEASE NOTES Guía de usuario descargar pdf (Pagina 171)

differentiate

4-95

Example Create a noisy sine wave on the interval [0, 4π].

rand('state',0);

x = linspace(0,4*pi,200)';

y = sin(x) + (rand(size(x))-0.5)*0.2;

Create a custom fit type, and fit the data using reasonable starting values.

ftype = fittype('a*sin(b*x)');

fopts = fitoptions('Method','Nonlinear','start',[1 1]);

fit1 = fit(x,y,ftype,fopts);

Calculate the first derivative for each value of x.

deriv1 = differentiate(fit1,x);

Plot the data, the fit to the data, and the first derivatives.

plot(fit1,'k-',x,y,'b.');hold on

plot(x,deriv1,'ro')

legend('data','fitted curve','derivatives')

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MATLAB CURVE FITTING TOOLBOX - RELEASE NOTES Guía de usuario Pagina 171