FileMaker Pro 4.1 Mac User's Guide

C-14 FileMaker Pro User’s Guide
Logical functions
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Syntax Definition
Radians (number) Converts degrees (π/180 radians) in number to
radians. Parameters for trigonometric functions
must be in radians—use this function to convert
values from degrees to radians within a formula.
Sin (number) Returns the sine of an angle expressed in radians
Tan (number) Returns the tangent of the angle (in radians) in
number. Tangents for values of 90 degrees (π/2
radians) or multiples are undefined (infinite).
Choose FileMaker Help Index from the or Help menu, and then type:
E trigonometric functions
Syntax Definition
Case (test1, result1 [, test2, result2,
default result]...)
Choose (test, result0 [, result1,
result2]...)
Evaluates test1 to produce a result. When test1 is
true (a nonzero value), returns result1; when test2 is
true, returns result 2, and so on. When no test is true,
returns an empty (null) value, or the default result
you supply.
Evaluates test to produce an index number used to
choose a result. When index is 0, returns result0;
when index is 1, returns result1, and so on. When
there’s no corresponding result, returns an empty
(null) result.
If (test, result one, result two) Evaluates test to return a true or false result. When
test is true (1), returns result one; when test is false
(0), returns result two. Test must return either a
numeric or Boolean result. (See the example below.)
IsEmpty (field) Returns true (1) when field is empty (null);
otherwise returns false (0)
IsValid (field) Returns false (0) when field is missing from the file
or when field contains an invalid value; otherwise
returns true (1). For example, if a field in a related
file is deleted, references to that field in the master
file are invalid. See chapter 10, “Using data from
related files.”