Difference between revisions of "Naming Objects"
From GeoGebra Manual
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<noinclude>{{Manual Page}}[[Category:Manual (official)|{{PAGENAME}}]]</noinclude> | <noinclude>{{Manual Page}}[[Category:Manual (official)|{{PAGENAME}}]]</noinclude> | ||
{{objects}} | {{objects}} | ||
| − | You can assign a certain name to an object when you create it using the Input Bar: | + | You can assign a certain name to an object when you create it using the [[Input Bar]]]: |
* [[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. | ||
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* 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== | ||
| + | There are a few labels you can't use for objects: x, y, z, xAxis, yAxis, zAxis. | ||
| + | |||
| + | Once you create object dependent on imaginary unit ''i'' or Euler number ''e'', [[Free, Dependent and Auxiliary Objects|auxiliary]] object called ''i'' (resp. ''e'') is created. From that moment you cannot use this label for other objects. On the other hand, if you define for instance ''e=3'', you will have to use special '''e''' character from the symbol list. | ||
See also [[Labels and Captions]]. | See also [[Labels and Captions]]. | ||
Revision as of 23:16, 29 January 2011
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°), Complex = 2 + i- 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°), complex = 1 – 2i- 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) Note:
- 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
There are a few labels you can't use for objects: x, y, z, xAxis, yAxis, zAxis.
Once you create object dependent on imaginary unit i or Euler number e, auxiliary object called i (resp. e) is created. From that moment you cannot use this label for other objects. On the other hand, if you define for instance e=3, you will have to use special e character from the symbol list.
See also Labels and Captions.
