Contour curve-fitting

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Ogheneochuko 2015-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/248475-contour-curve-fitting

评论： Mike Garrity 2015-10-14

Ir_6716.mat

Hello All, I had earlier asked a question on the use of lsqcurvefit on the contours produced from my program shown below but I got the response that it is not possible to use lsqcurvefit. As such is there any kind of curve fitting that can be applied to the contours produced from the program applied to the mat file attached. If there is please help. Thanks.

    Z = load('Ir_6716.mat');
    flds = fieldnames(Z);% Fieldnames of data.
    field = flds{1};% First field in data structure.
    A = Z.(field);
    B = -272.+A;% converts from kelvin to celsius
    contour(flipud(B));
    [C,h] = contour(interp2(flipud(B),'spline'));
    clabel(C,h);

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Mike Garrity 2015-10-14

What's your goal? If you're trying to smooth the contours by using least squares, I think that you'll find that it is a lot more robust to do apply a low-pass filter to the 2D data, and then contour that. Filtering after contouring tends to have stability issues because you've discarded so much information before filtering.

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