GitHub - ahmedhosssam/lesser_pandas: Data Analysis library in C++

#include "lesser_pandas.h"

int main() {
    DataFrame df("data.csv");

    cout << "Full DataFrame:\n";
    cout << df << endl;

    cout << "First 3 rows:\n";
    df.head(3);

    cout << "Last 2 rows:\n";
    df.tail(2);

    // Access a single column
    Column& age_col = df["Age"];
    cout << "Age column:\n" << age_col << endl;

    // Compute mean of Age column (ignoring missing values)
    cout << "Mean age: " << age_col.mean() << endl;

    age_col.fillna(age_col.mean());
    cout << "Age column after filling missing values with the average:\n" << age_col << endl;

    // Save the DataFrame to a file named "output.csv"
    df.save_to_csv("output.csv", true, "|", true, "N/A", {"Age", "Salary"});

    df.fillna(5);
    cout << "DataFrame after filling missing values:\n";
    cout << df << endl;

    // Rename columns
    df.rename({{"Age", "Years"}, {"Salary", "Income"}});
    cout << "DataFrame after renaming columns:\n";
    cout << df << endl;
    cout << df["Income"];

    cout << "Min Salary: " << df["Income"].min() << endl;
    cout << "Max Salary: " << df["Income"].max() << endl;

    // Filtering 
    DataFrame newData = df[df["Years"] > 30];
    cout << newData << endl;

    return 0;
}