2025

Summary

近年、競馬は単なるギャンブルではなく、データ分析を生かし、収益を狙うものとしてでも注目されています。 中央競馬（JRA）はレースや馬、騎手、血統などあらゆる情報がデジタル化されており、 データサイエンティストにとっては機械学習や統計モデルの実践フィールドとして非常に魅力的です。

本記事では、競馬の基本的な仕組みと、データ分析に必要な視点からの基礎知識を纏めて見ました。

Summary

When working with Polars, a lightning-fast DataFrame library built in Rust and designed for performance, many Python developers are surprised to encounter something they rarely see in standard Python: Overflow.

This post explains why overflow happens in Polars, how it differs from standard Python behaviour, and what you can do to prevent it.

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The cmp command in Linux is a powerful utility used to compare two files byte by byte. It is primarily used to identify differences between binary or text files, making it invaluable for tasks such as verifying file integrity or identifying modifications.

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The scp (Secure Copy) command is a command-line utility that allows you to securely copy files and directories between a local and a remote host, or between two remote hosts. It leverages the SSH protocol for secure data transfer.

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The umask command in Linux sets or displays the file mode creation mask, which determines the permissions of newly created files and directories. It's a crucial tool for controlling default permissions.

Summary

The join command in Linux is used to combine lines from two files based on a common field. It's essentially a simplified database join operation performed on plain text files.

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The odt command, part of the odt2txt package, is a simple command-line utility for converting OpenDocument Text (.odt) files to plain text.

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The pushd command in Linux allows you to change the current directory and save the previous directory for easy return. It's part of the shell's directory stack management.

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The wc command in Linux is a versatile utility used for counting the number of lines, words, characters, and bytes within a file or input stream. It's a fundamental tool for text analysis and data manipulation.

Summary

The wc command in Linux is a utility that displays the number of lines, words, and bytes (or characters) in a file. It's a simple yet powerful tool for quick text analysis.