切换到宽版
  • 广告投放
  • 稿件投递
  • 繁體中文
    • 11619阅读
    • 2回复

    [分享]Matlab中超几何分布作图介绍 [复制链接]

    上一主题 下一主题
    离线我是菜鸟
     
    发帖
    1113
    光币
    1534
    光券
    0
    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 Jb7iBQ2%  
    i},d[  
    ans = &yB%QX{3  
    <>VID E  
       NaN gU~ L@R_D  
    ' 4,y  
            查看了一下帮助  help hygepdf b-2pzcK{#  
    k]t,q$Vd  
    HYGEPDF Hypergeometric probability density function. ]9#CVv[rq  
    U&`6&$]  
        Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability Ywmyr[Uh'  
        density function at X with integer parameters M, K, and N. YXgWH'i~  
        Note: The density function is zero unless X is an integer. :,jPNuOA  
    EG%I1F%  
        The size of Y is the common size of the input arguments. A scalar input   DQ%`v =  
        functions as a constant matrix of the same size as the other inputs.     ix:2Z-  
    KuIkul9^%  
        See also hygecdf, hygeinv, hygernd, hygestat, pdf. E=}6 X9X  
     c^rC8E  
        Reference page in Help browser nT_*EC<.  
           doc hygepdf tsck|;v  
    keae.6[  
            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: u$apH{  
    7F"3<U@J  
                       http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m "v@);\-V  
    1]"D%U=  
            直到发现这个例子后才清楚各个参数所代表的具体意义。 H3!,d`D.N  
    pi|\0lH6W  
    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? 52da]BW<  
    ,<7"K&  
    p = hygepdf(0:5,100,20,10) f+{c1fb>s  
    0Wjd-rzc,  
    p =  0.0951 0.2679 0.3182 0.2092 0.0841 0.0215 #c6ui0E%;t  
    X";TZk  
    详细可参见: 7F,07\c  
    http://www.physnet.uni-hamburg.de/physnet/matlab/help/toolbox/stats/hygepdf.html#4257 ,NjX&A@  
    th5 X?so  
            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 dz{#"No0  
    Dq{:R  
    x = 0:5 (}9cD^F0n  
    p = hygepdf(x,100,20,10); +G<}JJ'V  
    plot(x,p,':k*')
     
    分享到
    离线ahhti
    发帖
    86
    光币
    41
    光券
    0
    只看该作者 1楼 发表于: 2010-03-03
    学习了 CW.&Y?>Tv  
    离线yzz1989
    发帖
    43
    光币
    5
    光券
    0
    只看该作者 2楼 发表于: 2012-03-04
    有没有中文的啊