Too many input arguments

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Dursman Mchabe
Dursman Mchabe 2019-2-9
评论： Dursman Mchabe 2019-2-12
Hi everyone,
I know this is a self-explaining error. I know it is usually caused by:
1) Passing a function more input arguments than it expected to receive, perhaps by passing a list of inputs rather than a vector of inputs, or have tried to obtain two outputs from a function that only returns one.
2) You have multiple functions with the same name. etc.
But I think all my inputs the function in line 117 are requred, yet I still get an error message:
Error using fzero (line 306)
FZERO cannot continue because user-supplied function_handle ==> @(pH)HionpH(pH,b) failed with the error below.
Too many input arguments.
Error in SlurryCase10Feb2019>kinetics (line 117)
pH = fzero(@(pH)HionpH(pH,b),pH1);
Error in lsqcurvefit (line 213)
initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Error in SlurryCase10Feb2019 (line 73)
[b]=lsqcurvefit(@kinetics,b0,tdata,ydata);
Caused by:
Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.
What can I change, on the attached code, to solve this problem?
  2 个评论
BERGHOUT Tarek
BERGHOUT Tarek 2019-2-10
send me the main program and subprogmes in rar file , and i will help you
Dursman Mchabe
Dursman Mchabe 2019-2-12
Thanks a lot Berghout. Apology for the delayed response. My PC stopped working. To which email address must I send the file. It is actual a very small program. I have it in one script. Lines 82 to 180 are the main program. Sub-programes are the nested functions.

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采纳的回答

Stephen23
Stephen23 2019-2-10
编辑：Stephen23 2019-2-10
Everywhere you call function HionpH you call it with two input arguments, but you defined the actual function with just one input argument (thus the error):
function ph = HionpH (pH)
"What can I change, on the attached code, to solve this problem?"
There are two possible solutions:
  • only call HionpH with one input argument (matching how it is defined), or
  • change the definition to accept two input arguments, e.g.:
function ph = HionpH(pH,b)
and then you will have to decide what you want to do with that input (if anything).
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Dursman Mchabe
Dursman Mchabe 2019-2-12
Thank you. I try that.
Dursman Mchabe
Dursman Mchabe 2019-2-12
I have set a breakpoint on line 218, and I have used a starting guess of pH_trial of 6.6379, which is a zero of @HionpH. Strangely, I still get:
Error using fzero (line 328)
Function value at starting guess must be finite and real.
Error in SlurryCase10Feb2019>SO2_OdeDriver (line 218)
pH = fzero(@(pH)HionpH(pH,b),pH_trial);
Error in SlurryCase10Feb2019>kinetics (line 164)
y = SO2_OdeDriver(y0,b);
Error in lsqcurvefit (line 213)
initVals.F = feval(funfcn_x_xdata{3},xCurrent,XDATA,varargin{:});
Error in SlurryCase10Feb2019 (line 73)
[b]=lsqcurvefit(@kinetics,b0,tdata,ydata);
Caused by:
Failure in initial objective function evaluation. LSQCURVEFIT cannot continue.

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