The Chebyshev class is now working pretty well, but I would like to settle some things up front.<br><br>1) Order in which coefficients are stored/passed/accessed.<br><br>The current poly1d class ctor is called with the coefficients in high to low order, yet the __getitem__ and __setitem__ methods access them in reverse order. This seems confusing and I think both should go in the same order and my preference would be from low to high. The low to high order also works a bit better for implementation.<br>
<br>2) poly1d allows the size of the coefficient array to be dynamically extended. I have mixed feeling about that and would prefer not, but there are arguments for that: students might find it easier to fool with.<br><br>
3) The poly1d class prunes leading (high power) zeros. Because the Cheb class has a fit static method that returns a Cheb object, and because when fitting with Chebyshev polynomials the user often wants to see *all* of the coefficients, even if some of the leading ones are zero, the Cheb class does not automatically prune the zeros, instead there are methods for that.<br>
<br>4) All the attributes of the Cheb class are read/write. The poly1d class attempts to hide some, but the method used breaks the copy module. Python really doesn&#39;t have private attributes, so I left all the attributes exposed with the usual Python proviso: if you don&#39;t know what it does, don&#39;t fool with it.<br>
<br>5) Is Cheb the proper name for the class?<br><br>Thoughts?<br><br>Chuck<br>