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[DEPRECATED]:computer: started as Mathematica tutorials/evolved into a messy collection of Mathematica scripts; Mathematica 简易教程/一个乱七八糟的放 notebook 的地方

Mathematica 97.93% CSS 1.54% XSLT 0.17% TeX 0.05% HTML 0.32%

whymathematica's People

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whymathematica's Issues

Proposal | Guokr Q&A Test

可以看看这样一个数据：

在有很多人回答的问题中，写过答案的人到底有多少人还会支持其他人的答案。

通过多个问题的检查，可以说明

  1. 到底大家知不知道支持这个东西是干吗用的？
  2. 是心理因素么？

24 

著作权归作者所有。
商业转载请联系作者获得授权，非商业转载请注明出处。
作者：丁小文
链接：http://zhuanlan.zhihu.com/dingwen/20523241
来源：知乎

toExprs[t_List] := Block[{x = ToString@t[[1]], y = ToString@t[[2]]},
   Prepend[t[[-Length@t + 2 ;;]], #] & /@ ("(" <> # <> ")" & /@ 
      Flatten[{x <> # <> y, y <> # <> x} & /@ {"+", "-", "*", "/"}])];
f[s_] := Flatten[toExprs[#] & /@ s, 1];
solve[num_List] := Block[{nums = Permutations[num]},
   Select[
    StringTake[
     DeleteDuplicates@
      Flatten@Nest[f, nums, Length[num] - 1], {2, -2}], 
    Quiet@ToExpression[#] == 25 &]];

solve[{1, 2, 3, 4}]

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