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2019-02-11

解析したいデータを表計算シートにまとめる際のヒント

解析したいデータを表計算シートにまとめる際に、やってはいけない例はよく知られています。では、データを表計算シートにまとめる際にどのようなことを積極的にするのが良いのでしょうか。

アメリカ統計学会の学会誌The American Statisticianに2017年に掲載された記事"Data Organization in Spreadsheets"には、まとめ方のヒントが紹介されています。このヒントが目指している主な目的は、データに関する間違いを減らすこと、および後々の解析をやり易くすることです。

その具体的なポイントを箇条書きにすると、以下のようになります。

上の記事はオープンアクセスになっているので、ヒントの詳細や理由を知りたい方は誰でも原文を読めます。

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2019-02-03

Introduction to tag, a Tag system processor

Emil Post's Tag system is a simple yet Turing-complete abstract machine. Here we introduce an open-source implementation of Tag system processor called tag: https://github.com/fixedpoint/tag.

With tag, it is easy to define and run your favorite Tag system, which accepts any finite input word written in a user-defined set of alphabets. For example, if you would like to run a well-known 2-Tag system for Collatz (sub)sequences, save the following three lines encoding its rules with alphabets {a, b, c}:

a bc
b a
c aaa

Supposing that the file is named collatz.txt in your working directory,

$ tag -i collatz.txt aaaaa
will generate the following outout and halt successfully:
aaaaa
  aaabc
    abcbc
      cbcbc
        cbcaaa
          caaaaaa
            aaaaaaaa
              aaaaaabc
                aaaabcbc
                  aabcbcbc
                    bcbcbcbc
                      bcbcbca
                        bcbcaa
                          bcaaa
                            aaaa
                              aabc
                                bcbc
                                  bca
                                    aa
                                      bc
                                        a

Please find more details in tag's README. Enjoy Tag systems and your feedback is highly appreciated.

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