README.md · 魏士杰/dataframe-cpp

# dataframe-cpp
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dataframe class for c++ language
- read from csv file
- write into csv file and lib_svm file
- min max scaler and standard scaler for each column's data
- append one row from std::vector<T> & remove row
- insert one column from std::vector<T> & remove column
- get a row of data  by index of the row 
- get a column of data  by string of the column 
- concat & add double dataFrame object (horizontally & vertically) 
- support single variable with multiple types, including char, int, long int, float, double, std::string

**Build requirements:** c++ 11 to 17

## Quick start

```cpp
#include "dataframe.hpp"

int main() {
    using namespace flame;
    // create an empty dataframe object
    dataframe d1;

// recreate a dataframe object from csv file or another
    d1.read_csv("../test"); // d1 = std::move(dataframe<double>("../test.txt"));

// create a dataframe object from csv file
    dataframe d2("../test");

// concat double dataframe object vertically
    auto d3 = d1 + d2;

// insert one column from std::vector<T>
    /* Note: only the column will be added automatically when name string of its is not detected.
    This feature does not exist for rows */
    d3["h"] = d3["f"] = d3["g"] = {6, 7, 8, 9};

// remove one column by str
    std::cout << ((d3.remove("g") ? "successfully" : "unsuccessfully") + std::string(" deleted a colunm!"))
              << std::endl;

// append one row from std::vector<T>
    d3.append(std::vector<user_variant>(d3.column_num()));

// change data in ith row
    d3[4] = {6, 7, 8, 9, 10};

// concat double dataframe object horizontally
    d3.concat_row(d3);

// change one item
    d3["f"][3] = 2;

// insert std::vector<T> into dataframe directly
    d3.insert("i", {6.6f, '7', 8, "hello", 10});

// remove one row by index
    std::cout << ((d3.remove(2) ? "successfully" : "unsuccessfully") + std::string(" deleted a row!")) << std::endl;

// print dataframe
    std::cout << d3;

// min_max_scaler<double> scaler(d3); // min max scaler
    toolbox::standard_scaler scaler(d3); // standard scaler

// save scaler into file
    scaler.save_scaler("../scaler");

// load scaler from file
    scaler.load_scaler("../scaler");

// transform dataset
    scaler.transform(d3);

std::cout << "after scaler : " << std::endl << d3;

// write into csv file
    d3.to_csv("../final", ',');

return 0;
}
```

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