First Command

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 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> ]

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.