步长在 z－方向的几率分布：
步长几率分布的一般表达式：
用随机数 R 对步长 s 取样：
得
对由数种材料构成的系统，截面是离散值，则上式成为：
则本计算的问题为：当给定抽样随机数 R 时，计算在每个材料中走过的实际抽样步长，由此得到总
步长：
i
j
s
i
s
j
Fortran77和90/95编程入门
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2012-10-15
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Fortran77和90/95编程入门 （429个子文件） 
SPHERE-1.doc 325KB SPHERE-2.doc 277KB
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