Difference between revisions of "Element Command"

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;Element[ <List L>, <Index1>, <Index2>,  ...]
 
;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.
 
: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> yields ''3'', <code><nowiki>Element[L, 2, 2]</nowiki></code> yields ''{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> yields ''3'', <code><nowiki>Element[L, 2, 2]</nowiki></code> yields ''{7, 8}''.</div>}}
 
{{note| 1=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| 1=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==

Revision as of 10:45, 9 September 2011


Element[ <List>, <Number n> ]
Yields the nth element of the list.
Example:
Element[{1, 3, 2}, 2] yields 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] yields -2, the third element of the second row of \begin{pmatrix}1&3&2\\0&3&-2\end{pmatrix}.
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] yields 3, Element[L, 2, 2] yields {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[{a, b, c}, 2] yields b, the second element of {a, b, c}.
Element[ <Matrix>, <Row>, <Column> ]
Yields the element of the matrix in the given row and column.
Example:
Element[{{a, b, c}, {d, e, f}}, 2, 3] yields f, the third element of the second row of\begin{pmatrix}a&b&c\\d&e&f\end{pmatrix}.
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