Difference between revisions of "First Command"
From GeoGebra Manual
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:Gives a list containing the first element of the list ''L''. | :Gives a list containing the first element of the list ''L''. | ||
{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> returns ''{1}''.</div>}} | {{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> returns ''{1}''.</div>}} | ||
− | To get the first element itself use | + | :{{note| 1=To get the first element itself use the [[Element Command]].}} |
;First[ <List L>, <Number n of elements> ] | ;First[ <List L>, <Number n of elements> ] | ||
:Gives a new list that contains just the first ''n'' elements of the list ''L''. | :Gives a new list that contains just the first ''n'' elements of the list ''L''. | ||
Line 20: | Line 20: | ||
:Gives a list containing the first element of the list ''L''. | :Gives a list containing the first element of the list ''L''. | ||
{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> returns ''{1}''.</div>}} | {{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> returns ''{1}''.</div>}} | ||
− | To get the first element itself use | + | :{{note| 1=To get the first element itself use the [[Element Command]].}} |
;First[ <List L>, <Number n of elements> ] | ;First[ <List L>, <Number n of elements> ] | ||
:Gives a new list that contains just the first ''n'' elements of the list ''L''. | :Gives a new list that contains just the first ''n'' elements of the list ''L''. | ||
− | {{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> returns ''{1, | + | {{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> returns ''{1, 4}''.</div>}} |
Revision as of 11:54, 5 August 2011
- First[ <List L> ]
- Gives a list containing the first element of the list L.
Example:
First[{1, 4, 3}]
returns {1}.- Note: To get the first element itself use the Element Command.
- First[ <List L>, <Number n of elements> ]
- Gives a new list that contains just the first n elements of the list L.
- First[ <Text> ]
- Gives first character of the text.
- First[ <Text> , <Number n of elements> ]
- Gives the first n characters of the text.
Example:
First["Hello",2]
returns "He".- First[ <Locus>, <Number n of elements> ]
- This command is useful for
- loci generated by SolveODE Command - It returns list points that were created in the first n steps of the numeric ODE-solving algorithm.
- loci generated using ShortestDistance Command, TravelingSalesman Command, Voronoi Command, MinimumSpanningTree Command, ConvexHull Command and Hull Command Commands - it returns vertices of the graph
CAS Syntax
- First[ <List L> ]
- Gives a list containing the first element of the list L.
Example:
First[{1, 4, 3}]
returns {1}.- Note: To get the first element itself use the Element Command.
- First[ <List L>, <Number n of elements> ]
- Gives a new list that contains just the first n elements of the list L.
Example:
First[{1, 4, 3}, 2]
returns {1, 4}.