Difference between revisions of "Logical Operators"
(Updated truth tables, eliminating Undefined and changing to semantics agreed on with Max.) |
m (fixed case) |
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! And !! 0 !! x !! NaN !! Null | ! And !! 0 !! x !! NaN !! Null | ||
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− | ! 0 || 0 || 0 || 0 || | + | ! 0 || 0 || 0 || 0 || Null |
|- | |- | ||
! x || 0 || 1 || NaN || Null | ! x || 0 || 1 || NaN || Null |
Revision as of 07:40, 20 February 2007
Logical operators are used to combine boolean assertions. Analytica uses the values True=1 and False=0.
When applied to values other than 0 or 1, other parameter values are interpreted as follows:
- a non-zero numeric is treated as true
- NaN is treated as ambiguous (could be 0 or 1)
- Null results in a warning, with a Null result.
- Any other data type results in an error.
Note: The value special Undefined is considered deprecated in Analytica 4.0. Null is now used exclusively for a non-existent value from within Analytica expressions.
And
A And B
True if both A and B are true. False if either A or B is false.
In this table, x signifies a numeric value that is not equal to zero (and is not NaN).
And | 0 | x | NaN | Null |
---|---|---|---|---|
0 | 0 | 0 | 0 | Null |
x | 0 | 1 | NaN | Null |
NaN | 0 | NaN | NaN | Null |
Null | Null | Null | Null | Null |
Or
A or B
True if A or B or both are true.
In this table, x signifies a numeric value that is not equal to zero (and is not NaN).
And | 0 | x | NaN | Null |
---|---|---|---|---|
0 | 0 | 1 | NaN | Null |
x | 1 | 1 | 1 | Null |
NaN | NaN | 1 | NaN | Null |
Null | Null | Null | Null | Null |
Not
Not | 0 | x | NaN | Null |
---|---|---|---|---|
1 | 0 | NaN | Null |
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