Not enough input arguments

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Dear experts,
I am quite new in MATLAB usage. Recently I have written a code to curvefit my experimental values. However, I am getting issues with insufficient input arguments which seems to be very common. I read through previous similar questions, but could not find a specific solution to the issue.
Tries with the main function
function F = HolzapfelFitting23_new(x,lamda)
1) Passing HolzapfelFitting23_new(x,lamda) in the Command Window gives me: "Not enough input arguments"
2) Whereas, providing HolzapfelFitting23_new(x0,lamda) in the Command Window gives me a different error:
Caused by:
Failure in initial objective function evaluation. LSQCURVEFIT cannot continue
I am not sure if the second step is itself correct. Can anyone please help me trace the error in the attached code to perform curve fit? I am using MATLAB R2020b.
Thank you all very much in advance.
Bests,
AB
  3 Comments
aroj bhattarai
aroj bhattarai on 2 Oct 2020
Hello Ankit, Thank you for your prompt response. I did that before using the function. With predefined input valus, calculation of F is okay (graphics confirm). But whenever optimset and lsqcurvefit are activated, initial objective function evaluation fails. Also, changing x0 to x inside the code gives an "unknown function or variable x" in lsqcurvefit usage line.
AB

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Accepted Answer

Walter Roberson
Walter Roberson on 2 Oct 2020
Edited: Walter Roberson on 2 Oct 2020
1) Passing HolzapfelFitting23_new(x,lamda) in the Command Window gives me: "Not enough input arguments"
In that environment, x is not a variable: x is a function (x.m) or is a static method of a class, and it is being invoked with no arguments by you referencing it.
Check with
which x
class(x)
  3 Comments
aroj bhattarai
aroj bhattarai on 2 Oct 2020
Thank you Roberson, I looked for other possibility by splitting my entire matlab script into two different files. First file calculates the value of the function F = HolzapfelFitting23_new(x,lamda) with indexed lamda. In second file, I provided all necessary parameters for curvefit, "x0, lamda, sig, lb, ub and options". It gave me what I wished for.
Good weekend!
AB

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