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Re: Fitting function

From: Doug Stewart
Subject: Re: Fitting function
Date: Sat, 10 Aug 2019 08:17:34 -0400

On Sat, Aug 10, 2019 at 8:01 AM mrodrig <address@hidden> wrote:
Dear Doug,

Thanks very much for your replay. Please, could you send me the solution?

You are trying to fit 2 straight lines to a set of data. Straight lines are of the form y = a*x+b. You did not have the b.

first I wrote a M file function that calculated a least-square value and returned this value.
The input to this function has to be the unknowns your R and the 2  'b's.

 Then I wrote the calling function and used the fminsearch function like this:
w=fminsearch (@q1,[R;b1;b2])
w is the resulting values for R b1 b2

Fminsearch takes the starting values for R b1 b2 and adjusts them to minimize the value returned from q1.m

I then used the calculated values and calculated a resultant y3 values and then plotted them together.

If you have more questions I will try and answer them.
Let me know If this works for you.

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