Texas Instruments TI-Nspire Reference Guide

TI-Nspire™ Reference Guide 15
centralDiff()
Catalog
>
centralDiff(Expr1,Va r [=Value][,Step]) ⇒ expression
centralDiff(Expr1,Va r [,Step])|Va r= Val u e ⇒ expression
centralDiff(Expr1,Va r [=Value][,List]) ⇒ list
centralDiff(List1,Va r [=Value][,Step]) ⇒ list
centralDiff(Matrix1,Va r [=Value][,Step]) ⇒ matrix
Returns the numerical derivative using the central difference quotient
formula.
When Val u e is specified, it overrides any prior variable assignment or
any current “with” substitution for the variable.
Step is the step value. If Step is omitted, it defaults to 0.001.
When using List1 or Matrix1, the operation gets mapped across the
values in the list or across the matrix elements.
Note: See also avgRC().
char()
Catalog
>
char(Integer) ⇒ character
Returns a character string containing the character numbered Integer
from the handheld character set. The valid range for Integer is 0–
65535.
c
2
2way
Catalog
>
c
2
2way obsMatrix
chi22way obsMatrix
Computes a c
2
test for association on the two-way table of counts in
the observed matrix obsMatrix. A summary of results is stored in the
stat.results variable. (See page 97.)
For information on the effect of empty elements in a matrix, see
“Empty (void) elements” on page 131.
Output variable Description
stat.c
2
Chi square stat: sum (observed - expected)
2
/expected
stat.PVal Smallest level of significance at which the null hypothesis can be rejected
stat.df Degrees of freedom for the chi square statistics
stat.ExpMat Matrix of expected elemental count table, assuming null hypothesis
stat.CompMat Matrix of elemental chi square statistic contributions

Texas Instruments TI-Nspire Specifications

General

Type	Display
Form factor	Pocket
Product color	Blue, White
Display resolution	320 x 240 pixels
Display size (HxV) (imperial)	0 \
Compatible operating systems	Windows Vista/XP Mac OS X 10.4/10.5
Battery type	AAA
Number of batteries supported	4

Weight and Dimensions

Dimensions (WxDxH)	100 x 198.3 x 28.7 mm