How do I set a custom algebraic upper/lower bound on lsqcurvefit, instead of a constant one?

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Samuel Castro
Samuel Castro 2017-3-27
评论： Alan Weiss 2017-3-29
How do I set a custom algebraic upper/lower limit on lsqcurvefit, instead of a constant one? On lsqcurvefit, I can only specify a constant value as upper/lower bound, but I want to set an algebraic expression, such as (y ~ b0*x1+b1*x2) where b0+b1<1

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回答（1 个）

Alan Weiss
Alan Weiss 2017-3-28
For that, you will have to use lsqlin (if it is applicable) or fmincon if it is not applicable. I cannot be sure, based on your description, whether lsqlin applies.
Alan Weiss
MATLAB mathematical toolbox documentation
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Samuel Castro
Samuel Castro 2017-3-28
Thanks Alan, I gave a linear example, but the function I want to fit will most likely be non linear. So I would need to define a a fmincon function reducing the quadratic error of it?
Alan Weiss
Alan Weiss 2017-3-29
Yes, you would. See this example, which uses fminunc, but you can easily adapt it to fmincon.
Alan Weiss
MATLAB mathematical toolbox documentation

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