Difference between revisions of "Element Command"

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:Provided L is ''n''-dimensional list, one can specify up to ''n'' indices to obtain an element (or list of elements) at given coordinates.
 
:Provided L is ''n''-dimensional list, one can specify up to ''n'' indices to obtain an element (or list of elements) at given coordinates.
 
:{{example|1=<div>Let <nowiki>L={{{1,2},{3,4}},{{5,6},{7,8}}}</nowiki>. Then <code><nowiki>Element[L,1,2,1]</nowiki></code> returns ''3'', <code><nowiki>Element[L,2,2]</nowiki></code> returns ''{7, 8}''.</div>}}
 
:{{example|1=<div>Let <nowiki>L={{{1,2},{3,4}},{{5,6},{7,8}}}</nowiki>. Then <code><nowiki>Element[L,1,2,1]</nowiki></code> returns ''3'', <code><nowiki>Element[L,2,2]</nowiki></code> returns ''{7, 8}''.</div>}}
{{note| For this command to work, the list or matrix can contain elements of one object type only (e. g., only numbers or only points.}}
+
{{note| For this command to work, the list or matrix can contain elements of one object type only (e. g. only numbers or only points).}}
 
==CAS Syntax==
 
==CAS Syntax==
 
;Element[List, Number n]
 
;Element[List, Number n]

Revision as of 09:46, 8 August 2011


Element[List, Number n]
Yields the nth element of the list.
Example:
Element[{1, 3, 2}, 2] gives 3, the second element of {1, 3, 2}.
Element[Matrix, Row, Column]
Yields the element of the matrix in the given row and column.
Example:
Element[{{1, 3, 2}, {0, 3, -2}}, 2, 3] gives -2, the third element of the second row of {{1, 3, 2}, {0, 3, -2}}.
Element[List L, Index1, Index2, ...]
Provided L is n-dimensional list, one can specify up to n indices to obtain an element (or list of elements) at given coordinates.
Example:
Let L={{{1,2},{3,4}},{{5,6},{7,8}}}. Then Element[L,1,2,1] returns 3, Element[L,2,2] returns {7, 8}.
Note: For this command to work, the list or matrix can contain elements of one object type only (e. g. only numbers or only points).

CAS Syntax

Element[List, Number n]
Yields the nth element of the list.
Example:
Element[{1, 3, 2}, 2] gives 3, the second element of {1, 3, 2}.
Element[Matrix, Row, Column]
Yields the element of the matrix in the given row and column.
Example:
Element[{{1, 3, 2}, {0, 3, -2}}, 2, 3] gives -2, the third element of the second row of {{1, 3, 2}, {0, 3, -2}}.
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