Difference between revisions of "First Command"
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Revision as of 22:10, 9 March 2013
- 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.
- 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
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}.
Note:
See also Last Command.