说明：  ％ binomial.m by David Terr, Raytheon, 5-11-04, from mathworks.com ％ Given nonnegative integers n and m with m<=n, compute the ％ binomial coefficient n choose m.
( Binomial.m by David Terr, Raytheon, 5-11-04, from mathworks.com Given nonnegative integers n and m with m <= n, compute the binomial coefficient n choose m.)