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我是菜鸟 2008-10-27 15:59

Matlab中超几何分布作图介绍

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 iX9[Q0g=oQ  
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ans = %l]rQjV-  
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   NaN 7p"~:1hU  
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        查看了一下帮助  help hygepdf +'YSpJ  
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HYGEPDF Hypergeometric probability density function. ,:Rq  
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    Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability O}\"$n>  
    density function at X with integer parameters M, K, and N. Z:o' +oh  
    Note: The density function is zero unless X is an integer. %]= 'Uv^x  
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    The size of Y is the common size of the input arguments. A scalar input   +XaO?F[c  
    functions as a constant matrix of the same size as the other inputs.     UdM5R [  
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    See also hygecdf, hygeinv, hygernd, hygestat, pdf. q}76aa0e  
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    Reference page in Help browser " :nVigw&  
       doc hygepdf oT5rX ,8  
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        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: y[7xK}`_  
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                   http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m yKk,);  
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        直到发现这个例子后才清楚各个参数所代表的具体意义。 URzE+8m^  
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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? 9[]"%6  
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p = hygepdf(0:5,100,20,10) #}]il0d  
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p =  0.0951 0.2679 0.3182 0.2092 0.0841 0.0215 Zo638*32  
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详细可参见: KL_}:O68  
http://www.physnet.uni-hamburg.de/physnet/matlab/help/toolbox/stats/hygepdf.html#4257 8@C|exAD`  
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        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 f`";Q/rG  
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x = 0:5 kGTc~p(  
p = hygepdf(x,100,20,10); x jUH<LFxy  
plot(x,p,':k*')
ahhti 2010-03-03 22:08
学习了 ~X(xa  
yzz1989 2012-03-04 13:00
有没有中文的啊
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