Difference between revisions of "First Command"
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| − | <noinclude>{{Manual Page|version= | + | <noinclude>{{Manual Page|version=5.0}}</noinclude>{{command|cas=true|list}} |
| − | {{command|list}} | + | ;First( <List> ) |
| − | ;First | + | :Gives a new list that contains the first element of the given list. |
| − | :Gives a new list that contains the first element of the list | + | :{{example|1=<div><code><nowiki>First({1, 4, 3})</nowiki></code> yields ''{1}''.</div>}} |
| − | :{{example|1=<div><code><nowiki>First | + | :{{note| 1=To get the first element use <code><nowiki>Element({1, 4, 3}, 1)</nowiki></code>.}} |
| − | :{{note| 1=To get the first element use <code><nowiki>Element | + | ;First( <List>, <Number n of elements> ) |
| − | ;First | + | :Gives a new list that contains just the first ''n'' elements of the given list. |
| − | :Gives a new list that contains just the first ''n'' elements of the list | + | :{{example|1=<div><code><nowiki>First({1, 4, 3}, 2)</nowiki></code> yields ''{1, 4}''.</div>}} |
| − | :{{example|1=<div><code><nowiki>First | + | ;First( <Text> ) |
| − | ;First | ||
:Gives first character of the text. | :Gives first character of the text. | ||
| − | :{{example|1=<div><code><nowiki>First | + | :{{example|1=<div><code><nowiki>First("Hello")</nowiki></code> yields ''"H"''.</div>}} |
| − | ;First | + | ;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 | + | :{{example|1=<div><code><nowiki>First("Hello",2)</nowiki></code> yields ''"He"''.</div>}} |
| − | ;First | + | ;First( <Locus>, <Number n of elements> ) |
:This command is useful for | :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 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]] | + | :*loci generated using [[ShortestDistance Command]], [[TravelingSalesman Command]], [[Voronoi Command]], [[MinimumSpanningTree Command]] and [[ConvexHull Command]] Commands - It returns vertices of the graph. |
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{{note| 1=<div>See also [[Last Command]].</div>}} | {{note| 1=<div>See also [[Last Command]].</div>}} | ||
Revision as of 08:25, 7 August 2019
- First( <List> )
- Gives a new list that contains the first element of the given list.
- Example:
First({1, 4, 3})yields {1}.
- Note: To get the first element use
Element({1, 4, 3}, 1). - First( <List>, <Number n of elements> )
- Gives a new list that contains just the first n elements of the given list.
- Example:
First({1, 4, 3}, 2)yields {1, 4}.
- First( <Text> )
- Gives first character of the text.
- Example:
First("Hello")yields "H".
- 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 and ConvexHull Command Commands - It returns vertices of the graph.
Note:
See also Last Command.
