Difference between revisions of "First Command"
From GeoGebra Manual
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; First[Text, Number n of elements]: Returns the first ''n'' characters of the text. | ; First[Text, Number n of elements]: Returns the first ''n'' characters of the text. | ||
{{Example|1=<code>First["Hello",2]</code> returns "He".}} | {{Example|1=<code>First["Hello",2]</code> returns "He".}} | ||
− | ; First[Locus, Number n of elements]: This command is useful | + | ; 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 [[ShortestPath Command]] and [[TravellingSalesman Command]] -- it returns vertices of the graph; their order determines the path resp. circle in the graph. |
Revision as of 15:10, 27 June 2011
- First[List L]
- Returns a list containing the first element of the list L.
Example:
First[{1,2,3}]
returns {1}.To get the first element itself use e.g. Element Command.
- First[List L, Number n of elements]
- Returns a new list that contains just the first n elements of the list L.
- First[Text]
- Returns first character of the text.
- First[Text, Number n of elements]
- Returns 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 ShortestPath Command and TravellingSalesman Command -- it returns vertices of the graph; their order determines the path resp. circle in the graph.