Difference between revisions of "First Command"

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{{command|list}}
 
{{command|list}}
 
;First[ <List L> ]
 
;First[ <List L> ]
:Gives the first element of the list ''L''.
+
:Gives a new list that contains the first element of the list ''L''.
:{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> yields ''1''.</div>}}
+
:{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> yields ''{1}''.</div>}}
:{{note| 1=To get the list containing only the first element use <code><nowiki>First[{1, 4, 3}, 1]</nowiki></code>.}}
+
:{{note| 1=To get the first element use <code><nowiki>Element[{1, 4, 3}, 1]</nowiki></code>.}}
 
;First[ <List L>, <Number n of elements> ]
 
;First[ <List L>, <Number n of elements> ]
 
:Gives a new list that contains just the first ''n'' elements of the list ''L''.
 
:Gives a new list that contains just the first ''n'' elements of the list ''L''.
Line 19: Line 19:
 
==CAS Syntax==
 
==CAS Syntax==
 
;First[ <List L> ]
 
;First[ <List L> ]
:Gives the first element of the list ''L''.
+
:Gives a new list that contains the first element of the list ''L''.
:{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> yields ''1''.</div>}}
+
:{{example|1=<div><code><nowiki>First[{1, 4, 3}]</nowiki></code> yields ''{1}''.</div>}}
:{{note| 1=To get the list containing only the first element use <code><nowiki>First[{1, 4, 3}, 1]</nowiki></code>.}}
+
:{{note| 1=To get the first element use <code><nowiki>Element[{1, 4, 3}, 1]</nowiki></code>.}}
 
;First[ <List L>, <Number n of elements> ]
 
;First[ <List L>, <Number n of elements> ]
 
:Gives a new list that contains just the first ''n'' elements of the list ''L''.
 
:Gives a new list that contains just the first ''n'' elements of the list ''L''.
 
:{{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> returns ''{1, 4}''.</div>}}
 
:{{example|1=<div><code><nowiki>First[{1, 4, 3}, 2]</nowiki></code> returns ''{1, 4}''.</div>}}

Revision as of 09:43, 8 August 2011


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] returns {1, 4}.
First[ <Text> ]
Gives first character of the text.
First[ <Text> , <Number n of elements> ]
Gives the first n characters of the text.
Example:
First["Hello",2] returns "He".
First[ <Locus>, <Number n of elements> ]
This command is useful for

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] returns {1, 4}.
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