Database Reference
In-Depth Information
If you violate any of these rules, FileMaker shows you a warning message. Unlike the slight
leeway you get with table and field names, the program doesn't let you finish creating your
custom function until you comply with the naming rules. You're safest sticking with alpha-
numeric characters.
Once you've created them, you can see Custom Functions in a special category of the Speci-
fy Calculation window's functions list (
Figure 13-15
).
Defining a Custom Function
To get started, you'll add a new function that can calculate the circumference of a circle.
Since a circumference is derived by multiplying the circle's diameter by pi, it makes sense to
use the words “circumference” and “diameter” in your function. That way, your formula will
be easy for other people to use later.
