help with using surface fit function

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Alexander Lazarev
评论： Alexander Lazarev 2022-5-5
I cant figure out whats wrong - but i just cat get this function to work. I have a 2D array of values (256x256) - z
I define X1 as 1x256 vector
Y1 as 1x256 vector
trying to use this, according to an example from the Help Docs:
sf=fit ( [X1,Y1],z,'Exclude', z < 10)
i get abunch of errors which I cant even understand.
Error using fit>iParseOptionalArgs
Algorithm options must be specified in a FITOPTIONS object or as property-value pairs.
Error in fit (line 113)
[useroptions, useroptargs, probparams] = iParseOptionalArgs( varargin{:} );

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采纳的回答

Matt J
Matt J 2022-5-2
编辑：Matt J 2022-5-2
You haven't specified the fit type. Also, your X, Y, and z elements all need to be (256^2)x1 vectors.
[XX,YY]=ndgrid(X1,Y1)
sf=fit ( [XX(:),YY(:)],z(:),fitType, 'Exclude', z < 10)
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Matt J
Matt J 2022-5-2
编辑：Matt J 2022-5-3
The Exclude option must also be given input in vector form. From the doc:
Exclude — Points to exclude from fit
expression | index vector | logical vector | empty
sf=fit ( [XX(:),YY(:)],z(:),fitType, 'Exclude', z(:) < 10)

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