lsqnonlin -not enough input arguments-

Hi all!

I need some help with lsqnonlin. The function is:

function [y] = FUN(p,t)

k1 = p(1);

k2 = p(2);

y=(exp(-k1*t)-exp(-k2*t))*((k1*k2)/(k2-k1));

And:

[p_stima] = lsqnonlin(@FUN,[0.4 0.5],[]);

The error is:

Not enough input arguments.

Error in FUN (line 4)

y=(exp(-k1*t)-exp(-k2*t))*((k1*k2)/(k2-k1));

Error in lsqnonlin (line 196)

            initVals.F = feval(funfcn{3},xCurrent,varargin{:});

Error in plotHistFit (line 88)

[p_stima] = lsqnonlin(@FUN,[0.4 0.5],[]);

Caused by:

    Failure in initial objective function evaluation. LSQNONLIN cannot continue

Thank you in advance.

Best regards

Answer 1

[Torsten]

Your FUN function must only have one argument, namely p.

Best wishes

Torsten.

[Matt J]

Therefore, the following modification could solve the issue,

t=???;
[p_stima] = lsqnonlin(@(p) FUN(p,t) , [0.4 0.5],[]);