Function convert_csc_sparse_matrix

src/memory/utils/mod.rs:500–516

Convert CSC sparse matrix between numeric types. Transforms a Compressed Sparse Column matrix from one numeric type to another while preserving the sparse structure. Similar to CSR conversion but for column-major format. ## Parameters `matrix` - Source CSC matrix to convert ## Type Parameters `T` - Source numeric type (e.g., i32, u32) `U` - Target floating-point type (f32 or f64) ## Returns Ne

(matrix: CscMatrix<T>)

/// ## Returns
/// New CSC matrix with converted values in target type
fn convert_csc_sparse_matrix<T, U>(matrix: CscMatrix<T>) -> anyhow::Result<CscMatrix<U>>
where
    T: NumericOps + NumCast + Copy, // Base numeric traits for source
    U: NumericOps + NumCast + Copy + Float, // Ensure target is float (f32/f64)
{
    let nrows = matrix.nrows();
    let ncols = matrix.ncols();
    let (col_offsets, row_indices, values) = matrix.disassemble();

    let new_values: Vec<U> = values
        .into_iter()
        .map(|x| NumCast::from(x).unwrap())
        .collect();

    CscMatrix::try_from_csc_data(nrows, ncols, col_offsets, row_indices, new_values)
        .map_err(|e| anyhow::anyhow!("Failed to create CSC matrix: {}", e))
}

/// Convert dense ndarray between numeric types.
///