nzl1116 发表于 2010-1-20 10:28:00

随机获取表中的对象

<p>调用此函数可以模拟掷毂子和洗扑克牌</p><p>(defun randGetObj (alist / int int0 int1 second n item)<br/>&nbsp; (if (not (listp alist))<br/>&nbsp;&nbsp;&nbsp; (progn<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (princ "\n参数类型错误！")<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (quit)<br/>&nbsp;&nbsp;&nbsp; )<br/>&nbsp; )<br/>&nbsp; (if (or (&lt; (length alist) 2) (&gt; (length alist) 60000))<br/>&nbsp;&nbsp;&nbsp; (progn<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (princ "\n参数表中的元素太多或太少了")<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (quit)<br/>&nbsp;&nbsp;&nbsp; )<br/>&nbsp; )<br/>&nbsp; (setq int (length alist))<br/>&nbsp; (setq&nbsp;int0 (fix (/ 60000 int))<br/>&nbsp;int0 (* int0 int)<br/>&nbsp;int0 (1- int0)<br/>&nbsp; )<br/>&nbsp; (setq&nbsp;second (read (menucmd "M=$(edtime,$(getvar,date),ss.MSEC)"))<br/>&nbsp;int1&nbsp;&nbsp; (* second 1000)<br/>&nbsp;n&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br/>&nbsp; )<br/>&nbsp; (while (and (&lt; n 10) (&lt; int0 int1))<br/>&nbsp;&nbsp;&nbsp; (setq second (read (menucmd "M=$(edtime,$(getvar,date),ss.MSEC)"))<br/>&nbsp;&nbsp; int1&nbsp; (* second 1000)<br/>&nbsp;&nbsp; n&nbsp; (1+ n)<br/>&nbsp;&nbsp;&nbsp; )<br/>&nbsp; )<br/>&nbsp; (if (= n 10)<br/>&nbsp;&nbsp;&nbsp; (setq int1 0)<br/>&nbsp; )<br/>&nbsp; (setq&nbsp;item (fix (rem int1 int)))<br/>&nbsp; (nth item alist)<br/>)</p>

lionyoyo 发表于 2010-1-20 15:57:00

<p>说白了就是带一组seed的随机函数</p>
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