[mathcad] FW: Sinus regression using genfit

Author: Bury, Scott SJ Posted: Wed, 15 Feb 2006 16:14:26 -0600

You seem to be missing the partial derivatives. In v11 this is required. In v13 you can use the optimized method

From: Torgrim Sandvoll "mailto:torgrim"
Sent: Wednesday, February 15, 2006 11:14 AM
To: Mathcad Discussion List
Subject: [mathcad] Sinus regression using genfit

Hi,

Trying to fit data to the general (sinusoidal) function: f(x,a):a0*sin(a1*(x+a2))+a3 (The periodic data for regression is often used in Norwegian highschool
math)

(See attached Mathcad (v11+) document)

Have tried with genfit, but this method seems very sensitive to the guess values given.

Any better way to solve this problem would be appreciated!

Have a nice day! :-)

Best regards,
Torgrim Sandvoll

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