9楼: Originally posted by liu0604 at 2013-08-03 20:08:02
厉害，请教一下Tr@#2是什么意思，求迹的东西？
能做一个简单的解释吗？感激不尽……...

2楼: Originally posted by mshwangg at 2013-07-22 18:35:33
aknew=ak
aknew[]=f[ak, i=1,4,7,9,....
aknew[]=g[ak, j=2,4,5,....
aknew[]=h[ak,k=3,11,13,15,...
f,g,h是某种计算，用函数表示了。
如果i,j,k中各个数值满足某种规律，可以把i,j,k做为循环变量进行操作。
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6楼: Originally posted by liu0604 at 2013-07-22 19:33:31
我试了一下：出现错误……
ak = {a, b, c, f, d, e, r, t, u};
aknew = ak;
aknew[] = ak[]^2, {i, 1, 2, 3};


Syntax::tsntxi: "aknew[]=ak[]^2,{i,1,2,3};" is incomplete; more input is need ...