Undefined function 'symsum' for input arguments of type 'double'
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Can someone explain me how can I correct this error "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
3 个评论
Walter Roberson
2018-3-29
What is the data type and size() of yij being passed in?
What is it that is to be summed?
symsum() will give back a scalar if its first parameter is scalar, so it is not immediately clear why you want to mean() the result.
Laura Barroso
2018-3-29
编辑：Laura Barroso
2018-3-29
I have to apply this sum to a M/M/1 queuing server simulation. It is not scalar, it's a matrix. I have another function that runs this into MM1, so the size of yij depends on the number of replicas of M/M/1 queuing server simulation.
Walter Roberson
2018-3-29
What is the data class of yij? You mention it is a matrix, but is it a matrix of double or a matrix of symbolic constants or a matrix of formulae?
采纳的回答
Walter Roberson
2018-3-29
For numeric array yji,
y_bar_i = mean(yji);
There should not be any loop: your other function that runs this is doing the looping.
There would only be a loop at the level that is generating multiple yji matrices.
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