Difference between revisions of "Boolean values"
From GeoGebra Manual
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Free Boolean variables can be displayed as check boxes in the [[Graphics View]] (see tool | Free Boolean variables can be displayed as check boxes in the [[Graphics View]] (see tool | ||
− | [[Image:Tool Check Box to Show Hide Objects.gif]][[Check Box | + | [[Image:Tool Check Box to Show Hide Objects.gif]][[Check Box Tool]]). By using the arrow keys of your keyboard you may also change Boolean variables in the Algebra View (see section [[Animation#Manual Animation|Manual Animation]]). |
{{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.}} | {{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.}} |
Revision as of 22:09, 24 November 2013
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). By using the arrow keys of your keyboard you may also change Boolean variables in the Algebra View (see section Manual Animation).
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 |