Can a function in matlab return a polynomial or an expression?

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Sachi
Sachi 2015-1-9
编辑： Guillaume 2015-1-9
Say I want (3x-3) returned when 3 is given as an input parameter. How can I do this?

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Titus Edelhofer
Titus Edelhofer 2015-1-9
Hi,
if you are looking for polynomials only: polynomials of form a_n*x^n+ ...+a_1*x+a_0 are represented as vectors [a_n ... a_1 a_0], so in your case simply [3 3].
Take a look at the functions working with polynomials (at the bottom of):
doc polyfun
Titus

更多回答（2 个）

Torsten
Torsten 2015-1-9
编辑：per isakson 2015-1-9
if Input == 3
f=@(x)(3*x-3);
end
Best wishes
Torsten.
Guillaume
Guillaume 2015-1-9
编辑：Guillaume 2015-1-9
Your question is too open ended to be answered properly. What do you want to do with the return value? What does (3x-3) mean to you? How is it even constructed (do you always want a polynomial of degree 1 with all coefficients equal to the input?). Depending on the answer to these questions
  • You could return a function handle, as in Torsten's answer.
  • You could return a vector of polynomial coefficients to be evaluated with polyval.
  • You could just return the string '3x-3', which you could construct any number of ways (with sprintf or num2str or ...)
  • You could return something else

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