why I am getting function error

this is my code. I am getting error for feeldof. it says it's not recognized.

index=feeldof(nd,nnel,ndof);

Answer 1

[Walter Roberson]

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

[fatmah hasan]

I figured it out. but again getting error for fematiso function.

[Walter Roberson]

Both of those functions appear to be available in https://github.com/raymonraymon/TheFiniteElementMethodUsingMatlab