Di Bruno's Formula

dibrunostring.m calculates the n-th derivative of the composition of two functions.

Given a composition of two functions and the list of the functions' derivatives as strings, this file computes the desired number of derivatives in double precision. For arbitrary precision, use the fixed point toolbox. Note: The Symbolic Toolbox computes derivatives of the composition directly and much quicker. See http://math.arizona.edu/~dostert/VIGRE/PostInversionFinalReport.pdf for more details.