[分享]Matlab中超幾何分布作圖介紹 [復(fù)制鏈接]

在用Matlab繪制各種常用概率分布的密度函數(shù)時(shí)，都比較簡(jiǎn)單，唯獨(dú)超幾何分布試了幾次都不成功，輸出結(jié)果總是 >cg)NqD  
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ans = 5E1`qof  
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   NaN :#35mBe}k  
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        查看了一下幫助  help hygepdf i/H;4
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HYGEPDF Hypergeometric probability density function. -aS@y.z  
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    Y = HYGEPDF(X,M,K,N) returns the hypergeometric probability ]8DTk!  
    density function at X with integer parameters M, K, and N. c$^v~lQS  
    Note: The density function is zero unless X is an integer. BRskxyL&,  
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    The size of Y is the common size of the input arguments. A scalar input   P=KhR&gwV~  
    functions as a constant matrix of the same size as the other inputs.     %7P]:G+Y\  
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    See also hygecdf, hygeinv, hygernd, hygestat, pdf. _SOwiz  
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    Reference page in Help browser 9H/R@i[E  
       doc hygepdf |iX>hJSl  
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        超幾何分布參數(shù)較多，這里關(guān)于三個(gè)參數(shù)的指代不詳。又在互聯(lián)網(wǎng)上查了相關(guān)資料，包括該函數(shù)的定義式： Q"nw.FjUG  
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                   http://ccpublic-1.central.cranfield.ac.uk/2001DMSOMFRC/pr062320/Matlab/stats/hygepdf.m b1jDbiH&  
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        直到發(fā)現(xiàn)這個(gè)例子后才清楚各個(gè)參數(shù)所代表的具體意義。 6 U[VoUU   
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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? ^v'0\(H?P  
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p = hygepdf(0:5,100,20,10) US(RWXyg  
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