Texas Instruments TI-Nspire CAS User Manual

102 Alphabetical Listing
►ln
Catalog >
Expr►ln ⇒ expression
Causes the input Expr to be converted to an
expression containing only natural logs (ln).
Note: You can insert this operator from the
computer keyboard by typing @>ln.
ln()
/u keys
ln(Expr1) ⇒ expression
ln(List1) ⇒ list
Returns the natural logarithm of the
argument.
For a list, returns the natural logarithms of
the elements.
If complex formatmode is Real:
If complex formatmode is Rectangular:
ln(squareMatrix1) ⇒ squareMatrix
Returns the matrix natural logarithm of
squareMatrix1. This is not the same as
calculating the natural logarithm of each
element. For information about the
calculation method, refer to cos() on.
squareMatrix1 must be diagonalizable. The
result always contains floating-point
numbers.
In Radian angle mode and Rectangular
complex format:
To see the entire result, press £ and then
use ¡and¢ to move the cursor.
LnReg
Catalog >
LnReg X, Y[, [Freq] [, Category, Include]]
Computes the logarithmic regression y =
a+b•ln(x) on lists X and Y with frequency
Freq. A summary of results is stored in the
stat.results variable. (See page 172.)
All the lists must have equal dimension
except for Include.

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

Summary

Important Information

License

Discusses software license terms and conditions.

Expression Templates

Fraction template

Template for entering fractions.

Exponent template

Template for entering exponents.

Matrix template (m x n)

Template for creating mxn matrices.

First derivative template

Template for calculating first derivatives.

Alphabetical Listing

abs()

Returns the absolute value of the argument.

angle()

Returns the angle of an argument as a complex number.

ANOVA

Performs one-way analysis of variance.

approx()

Evaluates arguments to decimal values.

Symbols

+ (add)

Returns the sum of two arguments.

- (subtract)

Returns the difference between two arguments.

* (multiply)

Returns the product of two arguments.

/ (divide)

Returns the quotient of two arguments.

EOS™ (Equation Operating System) Hierarchy

Order of Evaluation

Details the priority levels for operators and functions.

Parentheses, Brackets, and Braces

Explains how grouped expressions are evaluated first.

Error Codes and Messages

Error code

Lists numeric error codes and their descriptions.

Warning Codes and Messages

Lists numeric warning codes and their associated messages.

Shortcuts for Entering Math Expressions

From the Handheld or Computer Keyboard

Lists shortcuts for handheld and computer input.

From the Computer Keyboard

Lists shortcuts specific to computer keyboard input.