Undefined function 'symsum' for input arguments of type 'double'

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Laura Barroso 2018-3-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/391320-undefined-function-symsum-for-input-arguments-of-type-double

编辑： Jan 2018-5-25

function [ yij ] = SPCmethod(yij,w)
        sym n;
        rep = 100;
        for i = 1:w
            yij(i) = mean (symsum(yij,i,1,rep))/rep
        end

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Jan 2018-5-25

[MOCED from flags] Yuichi Tadokoro wrote

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Answer 1

Jan 2018-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/391320-undefined-function-symsum-for-input-arguments-of-type-double#answer_321920

编辑：Jan 2018-5-25

The error message is clear: yij is a variable of type double, but symsum needs a symbolical expressions. Please post, what you use as input to this function.

Omit the useless sym n;, because n is not used anywhere.