C++ DataFrame for statistical, financial, and ML analysis in modern C++

ai cpp data-analysis data-science dataframe financial-data-analysis financial-engineering heterogeneous-data large-data machine-learning multidimensional-data numerical-analysis pandas polars statistical statistical-analysis tensor tensorboard trading-algorithms trading-strategies
1 Open Issue Need Help Last updated: Aug 7, 2025

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Data Science Data Analysis

AI Summary: The task is to debug a C++ DataFrame library. The user is encountering unexpected output when using the `groupby()` function with the `csv2` output format. The output in CSV format shows inconsistencies in the number of rows, while the JSON output shows a different issue. The goal is to identify and fix the bug in the `groupby()` function's handling of the `csv2` output format, ensuring consistent and correct output.

Complexity: 4/5
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C++ DataFrame for statistical, financial, and ML analysis in modern C++

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