Texas Instruments TI-Nspire CAS User Manual

sumIf()
Catalog >
List can be an expression, list, or matrix.
SumList, if specified, must have the same
dimension(s) as List.
Criteria can be:
• A value, expression, or string. For
example, 34 accumulates only those
elements in List that simplify to the
value 34.
• A Boolean expression containing the
symbol ? as a placeholder for each
element. For example, ?<10 accumulates
only those elements in List that are less
than 10.
When a List element meets the Criteria,
the element is added to the accumulating
sum. If you include sumList, the
corresponding element from sumList is
added to the sum instead.
Within the Lists & Spreadsheet application,
you can use a range of cells in place of List
and sumList.
Empty (void) elements are ignored. For
more information on empty elements, see
page 232.
Note: See also countIf(), page 39.
sumSeq()
See Σ(), page 220.
system()
Catalog >
system(Eqn1[, Eqn2[, Eqn3[, ...]]])
system(Expr1[, Expr2[, Expr3[, ...]]])
Returns a system of equations, formatted
as a list. You can also create a system by
using a template.
Note: See also System of equations, page 7.
Alphabetical Listing 177

Texas Instruments TI-Nspire CAS Specifications

General

Type	Graphing
Cover	-
Form factor	Pocket
Control type	Buttons, Touch
Product color	Grey, Silver
Digits	- digits
Display tilting	No
Display resolution	320 x 240 pixels
Display number of lines	- lines
Compatible operating systems	Windows XP/2000\\r Mac OS X 10.4/10.5
Battery type	AAA
Power source	Battery
Number of batteries supported	4
USB port	Yes
USB 2.0 ports quantity	1
RAM capacity	16 MB
ROM capacity	20 MB

Weight and Dimensions

Depth	198.3 mm
Width	100 mm
Height	28.7 mm