Gri Commands
1: Introduction 2: Simple example 3: Fancy example 4: Running Gri 5: Programming Gri 6: General Issues 7: X-Y Plots 8: Contour Plots 9: Image Plots 10: Examples 11: Handling Data 12: Gri Commands 13: Gri Extras 14: Evolution of Gri 15: Installing Gri 16: Gri Bugs 17: System Tools 18: Acknowledgments 19: License 20: Newsgroup 21: Concept Index |
12.40: The `
|
`rpnfunction name replacement-words' |
name
' will be
substituted with the indicated replacement words.
For example,
the following shows the definition and use of a function which computes
the sine of twice an angle, by multiplying whatever is on the stack by
`2
', and then taking the sine of the result.
rpnfunction sin2 2 * sin show "expect the number 1 to follow: " {rpn 45 sin2} |
defined
'
operator; see rpn Mathematics.
Note: The mathematical constants `e
' and `pi
' are stored using
`rpnfunctions
'. Also, two `rpnfunctions
' are provided for
finding the slope and intercept of a line joining two points, e.g.
# Expect answers 1 and 10 ... show "slope=" {rpn 0 1 1 11 linear_slope} show "inter=" {rpn 0 1 1 11 linear_intercept} |
set grid missing above .intercept. .slope.
'
and `set z missing above .intercept. .slope.
'.