Difference between revisions of "Naming Objects"
From GeoGebra Manual
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* [[Points and Vectors|Points]]: In GeoGebra, points are always named using upper case letters. Just type in the name (e. g., A, P) and an equal sign in front of the coordinates or commands. | * [[Points and Vectors|Points]]: In GeoGebra, points are always named using upper case letters. Just type in the name (e. g., A, P) and an equal sign in front of the coordinates or commands. | ||
| − | {{example|1=<code>C = (2, 4)</code>, <code> P = (1; 180°)</code>}} | + | :{{example|1=<code>C = (2, 4)</code>, <code> P = (1; 180°)</code>}} |
* [[Points and Vectors|Vectors]]: In order to distinguish between points and vectors, vectors need to have a lower case name in GeoGebra. Again, type in the name (e. g., v, u) and an equal sign in front of the coordinates or commands. | * [[Points and Vectors|Vectors]]: In order to distinguish between points and vectors, vectors need to have a lower case name in GeoGebra. Again, type in the name (e. g., v, u) and an equal sign in front of the coordinates or commands. | ||
| − | {{example|1=<code>v = (1, 3)</code>, <code> u = (3; 90°)</code>}} | + | :{{example|1=<code>v = (1, 3)</code>, <code> u = (3; 90°)</code>}} |
* [[Lines and Axes|Lines]], circles, and [[conic sections]]: These objects can be named by typing in the name and a colon in front of their equations or commands. | * [[Lines and Axes|Lines]], circles, and [[conic sections]]: These objects can be named by typing in the name and a colon in front of their equations or commands. | ||
| − | {{example|1=<code>g: y = x + 3</code>, <code>c: (x-1)^2 + (y – 2)^2 = 4</code>, <code>hyp: x^2 – y^2 = 2</code>}} | + | :{{example|1=<code>g: y = x + 3</code>, <code>c: (x-1)^2 + (y – 2)^2 = 4</code>, <code>hyp: x^2 – y^2 = 2</code>}} |
* [[Functions]]: You can name functions by typing, for example, <code>f(x) =</code> or <code>g(x)=</code> in front of the function’s equation or commands. | * [[Functions]]: You can name functions by typing, for example, <code>f(x) =</code> or <code>g(x)=</code> in front of the function’s equation or commands. | ||
| − | {{example|1=<code>h(x) = 2 x + 4</code>, <code>q(x) = x^2, trig(x) = sin(x)</code>}} | + | :{{example|1=<code>h(x) = 2 x + 4</code>, <code>q(x) = x^2, trig(x) = sin(x)</code>}} |
| − | {{ | + | :{{notes|1= |
| − | * If you don’t manually assign a name to an object, GeoGebra assigns the names of new objects in alphabetical order. | + | :* If you don’t manually assign a name to an object, GeoGebra assigns the names of new objects in alphabetical order. |
| − | * You can create indices within the names of objects by using an underscore. For example A<sub>1</sub> is entered as <code>A_1</code> and s<sub>AB</sub> is entered as <code>s_{AB}</code>. }} | + | :* You can create indices within the names of objects by using an underscore. For example A<sub>1</sub> is entered as <code>A_1</code> and s<sub>AB</sub> is entered as <code>s_{AB}</code>. }} |
==Reserved labels== | ==Reserved labels== | ||
Revision as of 12:10, 7 April 2014
You can assign a certain name to an object when you create it using the Input Bar:
- Points: In GeoGebra, points are always named using upper case letters. Just type in the name (e. g., A, P) and an equal sign in front of the coordinates or commands.
- Example:
C = (2, 4),P = (1; 180°)
- Vectors: In order to distinguish between points and vectors, vectors need to have a lower case name in GeoGebra. Again, type in the name (e. g., v, u) and an equal sign in front of the coordinates or commands.
- Example:
v = (1, 3),u = (3; 90°)
- Lines, circles, and conic sections: These objects can be named by typing in the name and a colon in front of their equations or commands.
- Example:
g: y = x + 3,c: (x-1)^2 + (y – 2)^2 = 4,hyp: x^2 – y^2 = 2
- Functions: You can name functions by typing, for example,
f(x) =org(x)=in front of the function’s equation or commands.
- Example:
h(x) = 2 x + 4,q(x) = x^2, trig(x) = sin(x)
- Notes:
- If you don’t manually assign a name to an object, GeoGebra assigns the names of new objects in alphabetical order.
- You can create indices within the names of objects by using an underscore. For example A1 is entered as
A_1and sAB is entered ass_{AB}.
Reserved labels
These are the labels you can't use for objects: x, y, xAxis, yAxis, zAxis, abs, sgn, sqrt, exp, log, ln, ld, lg, cos, sin, tan, acos, arcos, arccos, asin, arcsin, atan, arctan, cosh, sinh, tanh, acosh, arcosh, arccosh, asinh, arcsinh, atanh, arctanh, atan2, erf, floor, ceil, round, random, conjugate, arg, gamma, gammaRegularized, beta, betaRegularized, sec, csc, cosec, cot, sech, csch, coth
In the symbol list of the input bar, you will find special characters for the following constants:
- π - the circle constant pi, which you can also type with Alt-p
- ℯ - the Euler number, e.g. for the exponential function ℯ^x, which you can also type with Alt-e
- ί - the imaginary unit, e.g. for complex numbers like z = 3 + ί, which you can also type with Alt-i
When the variable names e and i are not used yet, they are automatically read as ℯ and ί respectively for convenience.
See also Labels and Captions.
