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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 ]S4TX  
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ans = `W,gYH7  
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   NaN E,&BP$B  
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        查看了一下帮助  help hygepdf pt.0%3  
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HYGEPDF Hypergeometric probability density function. h^h,4 H\r  
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    Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability 4^vEMq8lB  
    density function at X with integer parameters M, K, and N. <;< _f U  
    Note: The density function is zero unless X is an integer. }UNRe]ft$  
)X2=x^u*U  
    The size of Y is the common size of the input arguments. A scalar input   ~Fp,nE-B  
    functions as a constant matrix of the same size as the other inputs.     t<s:ut)Q!  
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    See also hygecdf, hygeinv, hygernd, hygestat, pdf. 9,wd,,ta  
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    Reference page in Help browser rZ5vey  
       doc hygepdf ~H!s{$.5  
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        超几何分布参数较多,这里关于三个参数的指代不详。又在互联网上查了相关资料,包括该函数的定义式: ]Tk3@jw+b  
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                   http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m Ex2TV7I  
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        直到发现这个例子后才清楚各个参数所代表的具体意义。 5W_u|z+/g  
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Suppose you have a lot of 100 floppy disks and you know that 20 of them are defective. What is the probability of drawing 0 through 5 defective floppy disks if you select 10 at random? _ #]uk&5a  
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p = hygepdf(0:5,100,20,10) \x?q!(;G2  
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p =  0.0951 0.2679 0.3182 0.2092 0.0841 0.0215 q8%T)$!  
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详细可参见: epM;u  
http://www.physnet.uni-hamburg.de/physnet/matlab/help/toolbox/stats/hygepdf.html#4257 &1)4B  
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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 u:#+R_0#97  
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x = 0:5 ) *Mr{`  
p = hygepdf(x,100,20,10); "]h4L  
plot(x,p,':k*')
ahhti 2010-03-03 22:08
学习了 N>qOiw[  
yzz1989 2012-03-04 13:00
有没有中文的啊
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