SeriesGroupByExpandingWindow

class pandas::SeriesGroupByExpandingWindow

pandas C++ class.

Example

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

// Use SeriesGroupByExpandingWindow
SeriesGroupByExpandingWindow obj;
// ... operations ...

Constructors

Signature	Location	Example
SeriesGroupByExpandingWindow(const SeriesGroupBy<numpy::float64, std::string>& gb, size_t min_periods)	pd_series_groupby.h:1211

Statistics

Signature	Return Type	Location	Example
Series<double> count() const	Series<double>	pd_series_groupby.h:1258	View
Series<double> max() const	Series<double>	pd_series_groupby.h:1246	View
Series<double> mean() const	Series<double>	pd_series_groupby.h:1240	View
Series<double> median() const	Series<double>	pd_series_groupby.h:1255	View
Series<double> min() const	Series<double>	pd_series_groupby.h:1243	View
Series<double> std_(int ddof = 1) const	Series<double>	pd_series_groupby.h:1252	View
Series<double> sum() const	Series<double>	pd_series_groupby.h:1237	View
Series<double> var(int ddof = 1) const	Series<double>	pd_series_groupby.h:1249	View

Aggregation

Signature	Return Type	Location	Example
Series<double> apply_per_group(ExpandingOp op) const	Series<double>	pd_series_groupby.h:1215

Code Examples

The following examples are extracted from the test suite.

count (pd_test_1_all.cpp:66)

        if (arr.is_na(0)) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_na_handling() : is_na(0) should be false" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_na_handling failed: is_na(0) should be false");
        }

        if (!arr.has_na()) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_na_handling() : has_na() should be true" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_na_handling failed: has_na() should be true");
        }

        if (arr.count() != 2) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_na_handling() : count() should be 2" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_na_handling failed: count() should be 2");
        }

        std::cout << " -> tests passed" << std::endl;
    }

    void pd_test_boolean_array_kleene_and() {
        std::cout << "========= BooleanArray: Kleene AND ======================= ";

max (pd_test_1_all.cpp:771)

        pandas::CategoricalArray arr = pandas::CategoricalArray::from_codes(codes, cats, true);  // ordered

        // Test min
        std::optional<std::string> min_val = arr.min();
        if (!min_val.has_value() || *min_val != "low") {
            std::cout << "  [FAIL] : in pd_test_categorical_array_ordered_operations() : min != 'low'" << std::endl;
            throw std::runtime_error("pd_test_categorical_array_ordered_operations failed: min != 'low'");
        }

        // Test max
        std::optional<std::string> max_val = arr.max();
        if (!max_val.has_value() || *max_val != "high") {
            std::cout << "  [FAIL] : in pd_test_categorical_array_ordered_operations() : max != 'high'" << std::endl;
            throw std::runtime_error("pd_test_categorical_array_ordered_operations failed: max != 'high'");
        }

        // Test unordered throws for min/max
        pandas::CategoricalArray unordered = arr.as_unordered();
        bool threw = false;
        try {
            unordered.min();

mean (pd_test_1_all.cpp:282)

            std::optional<bool>(true),
            std::optional<bool>(true)
        });

        auto s = arr.sum();
        if (!s.has_value() || s.value() != 3) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_reductions() : sum should be 3" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_reductions failed: sum");
        }

        auto m = arr.mean();
        if (!m.has_value() || std::abs(m.value() - 0.75) > 0.001) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_reductions() : mean should be 0.75" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_reductions failed: mean");
        }

        std::cout << " -> tests passed" << std::endl;
    }

    void pd_test_boolean_array_dtype() {
        std::cout << "========= BooleanArray: dtype ======================= ";

median (pd_test_1_all.cpp:20910)

                throw std::runtime_error("pd_test_expanding_var failed: expanding var values incorrect");
            }

            std::cout << " -> tests passed" << std::endl;
        }

        void pd_test_expanding_median() {
            std::cout << "========= Expanding median ======================";

            pandas::Series<double> s({1.0, 2.0, 3.0, 4.0, 5.0});
            auto result = s.expanding().median();

            // Expanding median: 1, 1.5, 2, 2.5, 3
            bool passed = std::abs(result[0] - 1.0) < 0.001 &&
                          std::abs(result[1] - 1.5) < 0.001 &&
                          std::abs(result[2] - 2.0) < 0.001 &&
                          std::abs(result[3] - 2.5) < 0.001 &&
                          std::abs(result[4] - 3.0) < 0.001;
            if (!passed) {
                std::cout << "  [FAIL] : in pd_test_expanding_median() : expanding median values incorrect" << std::endl;
                throw std::runtime_error("pd_test_expanding_median failed: expanding median values incorrect");

min (pd_test_1_all.cpp:764)

    }

    void pd_test_categorical_array_ordered_operations() {
        std::cout << "========= CategoricalArray: ordered operations (min/max) ======================= ";

        std::vector<std::string> cats = {"low", "medium", "high"};
        std::vector<numpy::int32> codes = {0, 2, 1, 0, -1};  // low, high, medium, low, NA
        pandas::CategoricalArray arr = pandas::CategoricalArray::from_codes(codes, cats, true);  // ordered

        // Test min
        std::optional<std::string> min_val = arr.min();
        if (!min_val.has_value() || *min_val != "low") {
            std::cout << "  [FAIL] : in pd_test_categorical_array_ordered_operations() : min != 'low'" << std::endl;
            throw std::runtime_error("pd_test_categorical_array_ordered_operations failed: min != 'low'");
        }

        // Test max
        std::optional<std::string> max_val = arr.max();
        if (!max_val.has_value() || *max_val != "high") {
            std::cout << "  [FAIL] : in pd_test_categorical_array_ordered_operations() : max != 'high'" << std::endl;
            throw std::runtime_error("pd_test_categorical_array_ordered_operations failed: max != 'high'");

std_ (pd_test_1_all.cpp:20752)

                throw std::runtime_error("pd_test_rolling_min_periods failed: with min_periods=1, idx 1 should be 3.0");
            }

            std::cout << " -> tests passed" << std::endl;
        }

        void pd_test_rolling_std() {
            std::cout << "========= Rolling std ===========================";

            pandas::Series<double> s({1.0, 2.0, 3.0, 4.0, 5.0});
            auto result = s.rolling(3).std_();

            // std([1,2,3]) = 1.0 (ddof=1)
            // std([2,3,4]) = 1.0
            // std([3,4,5]) = 1.0
            bool passed = std::abs(result[2] - 1.0) < 0.001;
            if (!passed) {
                std::cout << "  [FAIL] : in pd_test_rolling_std() : rolling std should be 1.0" << std::endl;
                throw std::runtime_error("pd_test_rolling_std failed: rolling std should be 1.0");
            }

sum (pd_test_1_all.cpp:276)

        }

        // Test sum/mean
        pandas::BooleanArray arr({
            std::optional<bool>(true),
            std::optional<bool>(false),
            std::optional<bool>(true),
            std::optional<bool>(true)
        });

        auto s = arr.sum();
        if (!s.has_value() || s.value() != 3) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_reductions() : sum should be 3" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_reductions failed: sum");
        }

        auto m = arr.mean();
        if (!m.has_value() || std::abs(m.value() - 0.75) > 0.001) {
            std::cout << "  [FAIL] : in pd_test_boolean_array_reductions() : mean should be 0.75" << std::endl;
            throw std::runtime_error("pd_test_boolean_array_reductions failed: mean");
        }

var (pd_test_1_all.cpp:20890)

                throw std::runtime_error("pd_test_expanding_std failed: expanding std values incorrect");
            }

            std::cout << " -> tests passed" << std::endl;
        }

        void pd_test_expanding_var() {
            std::cout << "========= Expanding var =========================";

            pandas::Series<double> s({1.0, 2.0, 3.0, 4.0, 5.0});
            auto result = s.expanding().var();

            // Expanding var (ddof=1): NaN, 0.5, 1.0, 1.6667, 2.5
            bool passed = std::isnan(result[0]) &&
                          std::abs(result[1] - 0.5) < 0.001 &&
                          std::abs(result[2] - 1.0) < 0.001 &&
                          std::abs(result[3] - 1.6667) < 0.001 &&
                          std::abs(result[4] - 2.5) < 0.001;
            if (!passed) {
                std::cout << "  [FAIL] : in pd_test_expanding_var() : expanding var values incorrect" << std::endl;
                throw std::runtime_error("pd_test_expanding_var failed: expanding var values incorrect");