LocProxy

class pandas::LocProxy

pandas C++ class.

Example

#include <pandas/pandas.h>
using namespace pandas;

// Use LocProxy
LocProxy obj;
// ... operations ...

Constructors

Signature	Location	Example
LocProxy(DataFrame& df, const std::string& label1, const std::string& label2)	pd_dataframe.h:3652

Other Methods

Signature	Return Type	Location	Example
operator DataFrame() const	operator	pd_dataframe.h:3693	View

Code Examples

The following examples are extracted from the test suite.

DataFrame (pd_test_1_all.cpp:22011)

        void pd_test_where_basic() {
            std::cout << "========= where basic functionality =======================";

            // Create DataFrame
            std::map<std::string, std::vector<double>> data;
            data["A"] = {1.0, 2.0, 3.0, 4.0};
            data["B"] = {5.0, 6.0, 7.0, 8.0};
            pandas::DataFrame df(data);

            // Create condition DataFrame (values > 2)
            std::map<std::string, std::vector<numpy::bool_>> cond_data;
            cond_data["A"] = {false, false, true, true};   // 1<=2, 2<=2, 3>2, 4>2
            cond_data["B"] = {true, true, true, true};     // all >2
            pandas::DataFrame cond(cond_data);

            // Apply where with replacement value -1
            pandas::DataFrame result = df.where(cond, -1.0);

            // Get column index for A - it's sorted alphabetically in std::map
            size_t col_a_idx = df.get_column_index("A");