How do i solve this matrix by using lsqcurvefit ?

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[Star Strider]

The code you posted has some significant inconsistencies:

ffun = @(C,wv1)lblaw1(C,wv1,a,b,c);
ax = lsqcurvefit(ffun,[2 3 4 5],v1,OD,[],[],options);

function fun = law1(C,v1,a,b,c)
fun = (a*C(1) + b*C(2) + c*C(3))* x;

For example, ‘v1’ does not appear in your ‘law1’ (or ‘lblaw1’) function calculation, so that is one problem.

Are you posting the code you are actually running?

Answer 1

[Walter Roberson]

In your code

function fun = law1(C,v1,a,b,c)
fun = (a*C(1) + b*C(2) + c*C(3))* x;

x is not defined.

The C corresponds to the current trial parameters, and v1 corresponds to xdata. You are ignoring the xdata input, v1, and instead using an undefined variable or function named x.

[Thu N]

Sorry, it's a typo. I have posted the code again.

[Walter Roberson]

In your modified code, the function that has the x parameter is named law1, but the anonymous function ffun calls upon lblaw1 instead.

[Walter Roberson]

In your most recent version of the code,

ffun = @(C,wv1)lblaw1(C,wv1,eox,edx,ecc);

passes 5 parameters to lblaw1, but

 function fun = lblaw1(C,v1,a,b,c,x)

needs 6 parameters.

What I think is that you should be using

function fun = law1(C,x,a,b,c)
fun = (a*C(1) + b*C(2) + c*C(3))* x;