Chapters: 1: Introduction 2: Simple example 3: Invocation 4: Finer Control 5: X-Y Plots 6: Contour Plots 7: Image Plots 8: Examples 9: Gri Commands 10: Programming 11: Environment 12: Emacs Mode 13: History 14: Installation 15: Gri Bugs 16: Test Suite 17: Gri in Press 18: Acknowledgments 19: License Indices: Concepts Commands Variables | ### 10.9.2: Rpn function Operators ``rpnfunction`' operators are user-defined operators. The parser replaces any such operator with the user-defined rpn expression. The ``rpnfunction`' operators are both general and powerful. An ``rpnfunction`' may be composed of any legal primitive rpn constructs or even other legal ``rpnfunction`' constructs. For details, (see Rpnfunction).