give constant parameters to fitnlm

I want to use fitnlm (rather than fminsearch and a cost function) because it has the built in statistics. I need to run the fit of the model with different costant parameters but I am not able to tell the function to pick a parameter from the workspace (the function return an error if I give three arguments like @(parameterToOptimise,xData,constantParameter).

My example is:

fit function and the values to fit are y and I have a constraint on the area under the curve that is A (depending on the fit problem).

I would like to write

@(α,x,Area)[(α+1)*Area/(-)*] (luckly and are constant, so I can write the numerical values), but I am not able to give a constant parameter to the function

Answer 1

[Image Analyst]

fitnlm() makes a best fit of your model to your data. I don't believe it takes into account some criteria like the area under the fitted curve is in some range.

I'm attaching a demo to fit a power law with fitnlm(). Change the model to be what you need. If you need more help, attach your data in a .mat file.

[FastCar]

Thank you, but I came across the str2func function that does exactly what I want (not imposing a constraint on the area, but passing extra parameters to the model function.

[zaydon latif]

Image Analyst hello sir , i want help me , i want you email to speak the problem .

i will gratiful to you .

[Walter Roberson]

Image Analyst has a personal policy of not discussing user question in email . Ask your question publicly and someone might volunteer .