On Mar 2, 9:04 am, Arthur Mc Coy <1984docmc...@gmail.com> wrote: > What do you mean by "arbitrary precision" ? Each method of calculating > of something has its own precision...
If you are unfamiliar with arbitrary precision, I'm referring to http://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic Suppose I find the eigenvalues of a matrix and the eigenvalues range from 1 to 0.0001. This can be handled by numpy in Python because the smallest eigenvalue is larger than then numerical precision of 1E-19. However, if the range of eigenvalues is 1 to 1E-40, then I will need to increase the precision of all calculations leading up to finding the eigenvalues. I am working with complex valued matrices and I expect to get real eigenvalues back (based on the physics of the system). The precision of numpy is apparent from the imaginary component of the eigenvalues I find, currently 1E-19 or 1E-20. I need better precision for small eigenvalues. In case you are curious, the complex-valued matrices are 20x20. Thanks -- http://mail.python.org/mailman/listinfo/python-list
