Polynomial with nested and anonymous functions.

Question

Wai Han 2020-10-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/623028-polynomial-with-nested-and-anonymous-functions

评论： Senal Direcksze 2021-2-11

How can I write this polynomial function without loops?

function fh = get_polynomial_handle(p)
    function polynomial = poly(x)
        polynomial = 0;
        for i = 1 : length(p)
            polynomial = polynomial + p(i) .* x.^(i-1);
        end
    end
    fh = @poly;
end
% I try to make this function recursively, but anyway, I am having some errors in writting this function without loop.
% Can anyone explain me?
% Note: The function is not necessary to be recursive, it's just one of the ways I've thought of.

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Answer 1

Ameer Hamza 2020-10-22

2
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https://ww2.mathworks.cn/matlabcentral/answers/623028-polynomial-with-nested-and-anonymous-functions#answer_521773

在 MATLAB Online 中打开

Something like this

polynomial = sum(p .* x.^(0:numel(p)-1));

Also see polyval().

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Ameer Hamza 2020-10-23

I am glad to be of help!

Senal Direcksze 2021-2-11

在 MATLAB Online 中打开

Thanks a lot mn. You just made my day, was stuck in this question for quite a while since yesterday. I was at 2 out of 3 errors. Even posted a forum to my lecturer for the first time last night.

P.S I tried with length & recursion but kept getting bugs for atleast one or 2 errors. Either some inputs didnt work properly or out of memory.

function pf = poly_fun(p)
if nargin < 1%Check no.of inputs
    return;
end
    function polynomial = poly(x)  
            polynomial = sum(p .* x.^(0:numel(p)-1));%numel for polynomial exponential
    end    
    pf = @poly;
end