作者magicfx (去南半球度假)
看板Statistics
标题[问题]用 Maple 验证超几何分配的性质
时间Thu Oct 25 02:15:05 2007
> N[1] := 'N[1]':
N[2] := 'N[2]':
f := binomial(N[1],x)*binomial(N[2],n-x)/binomial(N[1]+N[2],n);
binomial(N[1], x) binomial(N[2], n - x)
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binomial(N[1] + N[2], n)
> simplify(sum(f, x = 0 .. N[1]));
Error, (in SumTools:-DefiniteSum:-ClosedForm) invalid input:
HypergeometricTerm expects its 2nd argument, n, to be of type name, but
received 1
请问 Error 之後出现的问题该怎麽解决?
我想练习用 Maple11 验证 f 是否为 well-defined 的 p.m.f
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※ 编辑: magicfx 来自: 140.109.49.71 (10/25 02:15)