Difference between revisions of "Boolean values"
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You can use the Boolean variables ''true'' and ''false'' in GeoGebra. Just type, for example, | You can use the Boolean variables ''true'' and ''false'' in GeoGebra. Just type, for example, | ||
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Revision as of 11:54, 3 August 2015
You can use the Boolean variables true and false in GeoGebra. Just type, for example,
a = true or b = false into the Input Bar and press the Enter-key.
Check Box and Arrow Keys
Free Boolean variables can be displayed as check boxes in the Graphics View (see tool
Check Box Tool).
Note: You may also use Boolean variables like numbers (value 0 or 1). This allows you to use a checkbox as the dynamic speed of an animated slider allowing you to start and stop the animation. In this case, the animation button is only shown in the Graphics View if there is also an animated slider with static (i.e. non-dynamic) speed.
Operations
You can use the following operations for Boolean variables and conditions in GeoGebra by either selecting them from the list next to the Input Bar or by entering them using the keyboard:
| Operation | List | Keyboard | Example | Object types |
|---|---|---|---|---|
| Equal | ≟ | == | a ≟ b or a == b | numbers, points, lines, conics a, b |
| Unequal | ≠ | != | a ≠ b or a != b | numbers, points, lines, conics a, b |
| Less than | < | a < b | numbers a, b | |
| Greater than | > | a > b | numbers a, b | |
| Less or equal than | ≤ | <= | a ≤ b or a <= b | numbers a, b |
| Greater or equal than | ≥ | >= | a ≥ b or a >= b | numbers a, b |
| And | ∧ | && | a ∧ b or a && b | Booleans a, b |
| Or | ∨ | || | a ∨ b or a || b | Booleans a, b |
| Not | ¬ | ! | ¬a or !a | Boolean a |
| Parallel | ∥ | a ∥ b | lines a, b | |
| Perpendicular | ⊥ | a ⊥ b | lines a, b | |
| Belongs to | ∈ | a ∈ list1 | number a, list of numbers list1 |
