在Erlang中转置二维矩阵 [英] Transposing a 2 dimensional matrix in Erlang
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问题描述
从
[[A1,A2,A3],
[B1,B2,B3],
[C1,C2,C3]]
To
[[A1,B1,C1 ],
[A2,B2,C2],
[A3,B3,C3]]
编辑:我意识到从原始问题不清楚。我想知道如何在 Erlang 中执行此操作。
解决方案
简化已经给出的解决方案你可以简单地做到这一点:
-module(transp)。
-export([transpose / 1])。
转置([[] | _]) - > [];
转置(M) - >
[列表:map(fun hd / 1,M)|转置(列表:map(fun tl / 1,M))]。
Given a matrix like below, transform it, say, 90 degrees into the second matrix below. How would you go about doing this in the cleanest way possible? Short/succinct/clear solutions where the point is easy to grasp is preferred.
From
[[A1,A2,A3],
[B1,B2,B3],
[C1,C2,C3]]
To
[[A1,B1,C1],
[A2,B2,C2],
[A3,B3,C3]]
Edit: I realize it was not clear from original question. I'd like to know how to do this in Erlang.
解决方案
Simplifying the solutions already given, you can do it in as short as:
-module(transp).
-export([transpose/1]).
transpose([[]|_]) -> [];
transpose(M) ->
[lists:map(fun hd/1, M) | transpose(lists:map(fun tl/1, M))].
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