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

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Can someone please explain me why I have this error? I was trying to do a sum of observations yij (observation i, replica j).
function [ yij ] = SPCmethod(yij,w)
sym n;
rep = 100;
for i = 1:w
yij(i) = mean (symsum(yij,i,1,rep))/rep

Accepted Answer

Veera Kanmani
Veera Kanmani on 29 Mar 2018
First you need to
syms n
not sym n
  1 Comment
Walter Roberson
Walter Roberson on 29 Mar 2018
That is not the problem, because they do not use n, so having an extra command equivalent to
will not cause any problems.

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