Difference between revisions of "First Command"
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:*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]], [[ConvexHull Command]] and [[Hull Command]] Commands - It returns vertices of the graph. | :*loci generated using [[ShortestDistance Command]], [[TravelingSalesman Command]], [[Voronoi Command]], [[MinimumSpanningTree Command]], [[ConvexHull Command]] and [[Hull 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 09:41, 21 September 2015
- 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, ConvexHull Command and Hull Command Commands - It returns vertices of the graph.
Note:
See also Last Command.