Boolean and Comparison Operations
This page lists the built-in methods and operators for applying Boolean operations like AND and OR, or for performing comparisons like greater-than or equality. For both static methods and operators, you can often pass in random variables as arguments e.g. Variable<double> instead of double. For compactness, this is not shown in the syntax below.
These methods provide a convenient short alternative to using Variable<T>.Factor and passing in the factor method, as described on this page.
Boolean Operations
Boolean operations are supported via operator overloads or static methods.
|
Operation |
Syntax |
Description |
|
And |
a & b
|
Creates a boolean random variable which is true if both a and b are true. |
| Or |
a | b |
Creates a boolean random variable which is true if either a or b are true. |
|
Not |
!a |
Creates a boolean random variable which is true if a is false. |
| AllTrue |
Variable.AllTrue(bool[] array)
Variable.AllTrue(IList<bool> array) |
Creates a boolean random variable which is true if all the elements of array are true. In other words, this is a N-valued AND. Where the array has length two, & should be used instead. |
Comparison Operations
Comparison operations are supported via operator overloads or static methods.
|
Operation |
Syntax |
Description |
| Equals |
a==b |
Creates a boolean random variable which is true if a and b are equal. |
| Not equals |
a!=b |
Creates a boolean random variable which is true if a and b are not equal. |
| Greater than / less than |
a>b, a<b
a>=b, a<=b
Note: a and b must be both double or both int |
Creates a boolean random variable which is true if a is greater than/less than/greater than or equal to/less than or equal to b. |
| IsPositive |
Variable.IsPositive(double x) |
Creates a boolean random variable which is true if x is positive. |
| IsBetween |
Variable.IsBetween(double x, double lowerBound, double upperBound) |
Creates a boolean random variable which is true if lowerBound <= x < upperBound. |
Last modified at 8/24/2009 2:13 PM by Tom Minka
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