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

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

[Jan]

[MOCED from flags] Yuichi Tadokoro wrote

Flagged as Unclear

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Answer 1

[Jan]

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.