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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 $ n 7dIE  
^>k[T.  
ans = PlBT H  
_W?}%;  
   NaN K*CO%:,-  
jF-z?  
        查看了一下帮助  help hygepdf t ;y>q  
N,Y<mX  
HYGEPDF Hypergeometric probability density function. z@<`]  
rxm!'.+  
    Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability Fwho.R-.  
    density function at X with integer parameters M, K, and N. M@{GT/`Pf  
    Note: The density function is zero unless X is an integer. MdEZ839J  
W13$-hf9  
    The size of Y is the common size of the input arguments. A scalar input   SV8rZWJ  
    functions as a constant matrix of the same size as the other inputs.     mC J/gWDY  
*"1]NAz+  
    See also hygecdf, hygeinv, hygernd, hygestat, pdf. D!)'c(b  
=%$ _)=}J  
    Reference page in Help browser SDdK5@1O4o  
       doc hygepdf gD&%$&q  
R.> /%o  
        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: p,ZubR J"  
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                   http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m {kW!|h&'  
J/RUKhs/  
        直到发现这个例子后才清楚各个参数所代表的具体意义。 #2x\d  
b6);bX>e  
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? 4[bw/[  
f9OVylm  
p = hygepdf(0:5,100,20,10) c67O/ B(  
$@Hw DRP  
p =  0.0951 0.2679 0.3182 0.2092 0.0841 0.0215 ,'82;oP4  
CBi V':;  
详细可参见: %2/WyD$U  
http://www.physnet.uni-hamburg.de/physnet/matlab/help/toolbox/stats/hygepdf.html#4257 4S03W  
#4d 0/28b  
        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 #T !YFMh;  
7jEAhi!Cq(  
x = 0:5 1a#wUd3  
p = hygepdf(x,100,20,10); Hhfqb"2on  
plot(x,p,':k*')
ahhti 2010-03-03 22:08
学习了 0]i#1Si~@  
yzz1989 2012-03-04 13:00
有没有中文的啊
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