Element Command

From GeoGebra Manual
Revision as of 23:37, 21 July 2011 by Zbynek (talk | contribs)
Jump to: navigation, search


Element[List, Number n]
Yields the nth element of the list.
Element[Matrix, Row, Column]
Yields the element of the matrix in the given row and column.
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.

Shorthand syntax

To get i-th element of list L expression L(i) can be used, in case of multidimensional lists one can use L(i1,i2,...,ik) instead of Element[L,i1,i2,..,ik] . Note that this syntax works only for labelled lists, syntax Element[Join[L,M],1,2,3] is correct, but Join[L,M](1,2,3) doesn't work.

© 2024 International GeoGebra Institute