covariance between the estimated parameters from curve fitting toolbox

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Hello,
I have collected data (x,y) from a sine wave. Now I want to fit a model to this data, e.g: y=A*sin(B*x+C) or y=E + A*sin(B*x) + D*cos(B*x).
Is there a way to estimate this parameters (A to D) with matlab, outside the curve fitting toolbox? The latter can provide me the parameters and confidence intervals, but i'm interested in the covariance between the estimated parameters.
If not, is there another way to calcualte the parameters and covariance between the estimated parameters A to D?
Thanks a lot.
Bram

Accepted Answer

Matt J
Matt J on 23 Aug 2019
Edited: Matt J on 23 Aug 2019
There is lsqcurvefit in the Optimization Toolbox. However, the Curve Fitting Toolbox does let you return the Jacobian, which is presumably what you would use for your covariance analysis,
  3 Comments
Matt J
Matt J on 11 Apr 2021
It is the 7th output argument of lsqcurvefit
[x,resnorm,residual,exitflag,output,lambda,jacobian] = lsqcurvefit(___)

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