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    [分享]Matlab中超几何分布作图介绍 [复制链接]

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    离线我是菜鸟
     
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    只看楼主 倒序阅读 楼主  发表于: 2008-10-27
    在用Matlab绘制各种常用概率分布的密度函数时,都比较简单,唯独超几何分布试了几次都不成功,输出结果总是 :?#wWF.  
    n{c-3w.uD  
    ans = Mt12 1Q&"  
    C\ cZ  
       NaN GMob&0l8_  
    T=pKen/  
            查看了一下帮助  help hygepdf u)P)r,  
    [{+ZQd  
    HYGEPDF Hypergeometric probability density function. 2QIo|$  
    3 +D4$Y"  
        Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability S?~/ V]  
        density function at X with integer parameters M, K, and N. + j6^g*  
        Note: The density function is zero unless X is an integer. *AYjMCo  
    tZD^<Q7}\  
        The size of Y is the common size of the input arguments. A scalar input   SR9M:%dga  
        functions as a constant matrix of the same size as the other inputs.     o1<Z; 2#  
    |c,'0V,"cH  
        See also hygecdf, hygeinv, hygernd, hygestat, pdf. ]=]`Mnuxb  
    [>kzQYT[  
        Reference page in Help browser CH=k=)() ]  
           doc hygepdf ^c>ROpic  
    `%0k\,}V  
            超几何分布参数较多,这里关于三个参数的指代不详。又在互联网上查了相关资料,包括该函数的定义式: O'W[/\A56M  
    8PW3x-+  
                       http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m =,W~^<\"  
    Y2y = P  
            直到发现这个例子后才清楚各个参数所代表的具体意义。 mC`U"rlK~  
    _We4%  
    Suppose you have a lot of 100 floppy disks and you know that 20 of them are defective. What is the probability of drawing 0 through 5 defective floppy disks if you select 10 at random? BH?fFe&J:`  
    0 aiE0b9c  
    p = hygepdf(0:5,100,20,10) _,|N`BBqd  
    Cqw`K P  
    p =  0.0951 0.2679 0.3182 0.2092 0.0841 0.0215 st(Y{Gs  
    M4}zRr([.5  
    详细可参见: 7C^W<SUo  
    http://www.physnet.uni-hamburg.de/physnet/matlab/help/toolbox/stats/hygepdf.html#4257 aw'o=/a8  
    xo(3<1mD  
            果然与一般对超几何分布公式字母惯常表示方式有所不同。尝试将上述分布作图如下 lO^YAOY  
    yvKKE  
    x = 0:5 .^?Z3iA",  
    p = hygepdf(x,100,20,10); T9Pu V  
    plot(x,p,':k*')
     
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    离线ahhti
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    只看该作者 1楼 发表于: 2010-03-03
    学习了 q#1Cm Kt4R  
    离线yzz1989
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    只看该作者 2楼 发表于: 2012-03-04
    有没有中文的啊