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undefined X variable in curve fit

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Gavin Seddon
Gavin Seddon 2015-9-2
回答： Gavin Seddon 2015-9-3
hello,
I have returned to the optimisation, I get
f(x) = p1*x^7 + p2*x^6 + p3*x^5 + p4*x^4 + p5*x^3 + p6*x^2 + p7*x + p8
Undefined function or variable 'x'.
how must I redefine X?
Thanks.

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采纳的回答

Walter Roberson
Walter Roberson 2015-9-2 
f = @(x) p1*x^7 + p2*x^6 + p3*x^5 + p4*x^4 + p5*x^3 + p6*x^2 + p7*x + p8

or

f = polyval([p1, p2, p3, p4, p5, p6, p7, p8], x);

更多回答（1 个）

Gavin Seddon
Gavin Seddon 2015-9-3
I had tried the 1st, I think it is my installation. Thanks.

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