Filtering & Selection

Filter by Condition

TablrDataFrame* tablr_dataframe_filter(const TablrDataFrame* df, TablrFilterFunc predicate, void* ctx);

Filter rows based on a predicate function.

Example:

bool filter_func(size_t row, void* ctx) {
    return row % 2 == 0;  /* Keep even rows */
}

TablrDataFrame* filtered = tablr_dataframe_filter(df, filter_func, NULL);

Select Rows

TablrDataFrame* tablr_dataframe_select_rows(const TablrDataFrame* df, const size_t* indices, size_t count);

Select specific rows by index.

Example:

size_t indices[] = {0, 2, 4, 6};
TablrDataFrame* selected = tablr_dataframe_select_rows(df, indices, 4);

Select Columns

TablrDataFrame* tablr_dataframe_select_columns(const TablrDataFrame* df, const char** columns, size_t count);

Select specific columns by name.

Example:

const char* cols[] = {"Age", "Salary"};
TablrDataFrame* selected = tablr_dataframe_select_columns(df, cols, 2);

Drop Missing Values

TablrDataFrame* tablr_dataframe_dropna(const TablrDataFrame* df);

Remove rows with missing values.

Example:

TablrDataFrame* clean = tablr_dataframe_dropna(df);