11.1.1. - How user functions work
User functions run as separate processes under the control of C-PLOT
and exchange data and other information with the plot program.
(See
Appendix C for a list of standard user functions.)
You needn't know very much about programming to create your own functions.
Prototype C-language files are included with the C-PLOT
package, along with the required overhead modules.
C-PLOT
creates the files, invokes your favorite editor and runs the compiler
for you.
For ordinary functions you need only type in the lines of
C code that describe your calculation.
Appendix E contains additional
information on writing user functions.
There are five types of user functions.
The type number becomes part
of the function name.
The types are:
| Type |
Arithmetic |
Description |
 |
|
|
| 1 |
y = f(x) |
Simple -- You give the range for x. |
|
| |
x = f(t) |
|
| 2 |
y = g(t) |
Parametric -- You give the range for t. |
| |
r = u(t) |
(In 3D mode, change r to z.) |
| |
s = v(t) |
|
|
| |
x = f(x, y, r, s) |
|
| 3 |
y = g(x, y, r, s) |
Operation -- Transforms current data. |
| |
r = u(x, y, r, s) |
(In 3D mode, change r to z.) |
| |
s = v(x, y, r, s) |
|
|
| 4 |
|
Other -- You supply data (current |
| |
|
data is available). |
|
| 5 |
|
Non-linear fitting -- See Chapter 12. |
|
|
Prev | Next 