Difference between revisions of "First Command"
From GeoGebra Manual
| Line 3: | Line 3: | ||
;First[ <List L> ] | ;First[ <List L> ] | ||
: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>}} |
:{{note| 1=To get the first element itself use the [[Element Command]].}} | :{{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, 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> returns "He".</div>}} | + | :{{example|1=<div><code><nowiki>First["Hello",2]</nowiki></code> returns "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 19: | Line 20: | ||
;First[ <List L> ] | ;First[ <List L> ] | ||
: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>}} |
:{{note| 1=To get the first element itself use the [[Element Command]].}} | :{{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, 4}''.</div>}} | + | :{{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> returns ''{1, 4}''.</div>}} |
Revision as of 11:55, 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.
- Example:
First[{1, 4, 3}, 2]returns {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]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}.
