Sum Command
From GeoGebra Manual
Revision as of 13:21, 25 August 2011 by Alexander Hartl (talk | contribs)
- Sum[ <List> ]
- Calculates the sum of all list elements.
- Example:
Sum[{1, 2, 3}]
yields the number a = 6.Sum[{x^2, x^3}]
yields f(x) = x2 + x3.Sum[Sequence[i, i, 1, 100]]
yields the number a = 5050.Sum[{(1, 2), (2, 3)}]
yields the point A = (3, 5).Sum[{(1, 2), 3}]
yields the point B = (4, 2).Sum[{"a", "b", "c"}]
yields the text "abc".
- Note: This command works for numbers, points, vectors, text, and functions.
- Sum[ <List>, <Number n of Elements> ]
- Calculates the sum of the first n list elements.
- Example:
Sum[{1, 2, 3, 4, 5, 6}, 4]
gives you the number a = 10.
- Note: This command works for numbers, points, vectors, text, and functions.
CAS Syntax
Following syntax works only in CAS view
- Sum[ <Expression f(t)>,<Variable t>,<Start Value s>,<End Value e>]
- Computes sum \sum_{t=s}^{e}f(t). End value might be infinity.
- Example:
Sum[i^2, i, 1, 3]
yields 14.Sum[r^i, i, 0, n]
yields 1- r\frac{n+1}{1-r}.Sum[(1/3)^i, i, 0, Infinity]
yields \frac{3}{2}.