title: Is there a package for approximating a function using Chebychev Polynomials?
body: <p>Is there a package for approximating a function using Chebychev Polynomials? 
  I was formerly using Matlab and there was a package called Compecon that can approximate a function using Chebychev Polynomials.
  I am wondering if there is any packages similar for Julia.
  Or is there any packages in C or fortran or Python that can do this?</p>
  
  <p>Thanka a lot!</p>