Difference between revisions of "First Command"
From GeoGebra Manual
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;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> | + | :{{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> yields ''{1, 4}''.</div>}} |
;First[ <Text> ] | ;First[ <Text> ] | ||
:Gives first character of the text. | :Gives first character of the text. | ||
;First[ <Text> , <Number n of elements> ] | ;First[ <Text> , <Number n of elements> ] | ||
:Gives the first ''n'' characters of the text. | :Gives the first ''n'' characters of the text. | ||
− | :{{example|1=<div><code><nowiki>First["Hello",2]</nowiki></code> | + | :{{example|1=<div><code><nowiki>First["Hello",2]</nowiki></code> yields ''"He"''.</div>}} |
;First[ <Locus>, <Number n of elements> ] | ;First[ <Locus>, <Number n of elements> ] | ||
:This command is useful for | :This command is useful for | ||
Line 24: | Line 24: | ||
;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> | + | :{{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> yields ''{1, 4}''.</div>}} |
Revision as of 10:22, 16 August 2011
- First[ <List L> ]
- Gives a new list that contains the first element of the list L.
- Example:
First[{1, 4, 3}]
yields {1}.
- Note: To get the first element use
Element[{1, 4, 3}, 1]
. - 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]
yields {1, 4}.
- 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]
yields "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 new list that contains the first element of the list L.
- Example:
First[{1, 4, 3}]
yields {1}.
- Note: To get the first element use
Element[{1, 4, 3}, 1]
. - 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]
yields {1, 4}.