| approximate | Evaluate an Approximation Operator |
| approximation_data | Create Approximation Data |
| approx_error | Compute Approximation Errors |
| approx_operator | Create an Approximation Operator |
| check_operator | Check an Approximation Operator |
| compare_operators | Compare Approximation Operators |
| convergence | Study Numerical Convergence |
| error_table | Create an Approximation Error Table |
| moments | Compute Moments of an Approximation Operator |
| parameter_scan | Scan an Operator Parameter |
| parameter_scan_2d | Scan Two Operator Parameters |
| plot.approx_convergence | Plot Numerical Convergence |
| plot.approx_operator | Plot an Approximation Operator |
| plot.approx_operator_comparison | Plot an Approximation Operator Comparison |
| plot.approx_parameter_scan | Plot an Approximation Parameter Scan |
| plot.approx_parameter_scan_2d | Plot a Two-Dimensional Parameter Scan |
| print.approx_error_table | Print an Approximation Error Table |
| print.approx_operator | Print an Approximation Operator |
| print.approx_operator_check | Print an Approximation Operator Check |
| register_operator | Register a Custom Approximation Operator |
| verify_moments | Verify moments of an approximation operator |