why I am getting function error

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this is my code. I am getting error for feeldof. it says it's not recognized.
index=feeldof(nd,nnel,ndof);

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Walter Roberson
Walter Roberson 2022-4-28
That function appears to be part of the File Exchange contribution https://www.mathworks.com/matlabcentral/fileexchange/12401-optimize-truss-by-fsd-and-slp

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