Texas Instruments TI-89 Titanium Short User Manual

Appendix A: Functions and Instructions 203
ln() @ 2x key H x key
ln( expression1 ) ⇒ expression
ln( list1 ) ⇒ list
Returns the natural logarithm of the argument.
For a list, returns the natural logarithms of the
elements.
ln(2.0) ¸ .693...
If complex format mode is
REAL:
ln({ë 3,1.2,5}) ¸
Error: Non-real result
If complex format mode is RECTANGULAR:
ln({ë 3,1.2,5}) ¸
{ln(3) + pø
i .182... ln(5)}
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 mode:
ln([1,5,3;4,2,1;6,ë 2,1]) ¸






1.831…+1.734…øi .009…ì 1.490…øi …
.448…ì.725…øi 1.064…+.623øi …
ë.266…ì 2.083…øi 1.124…+1.790…øi …
LnReg MATH/Statistics/Regressions menu
LnReg list1 , list2 [, [ list3 ] [, list4 , list5 ]]
Calculates the logarithmic regression and updates
all the system statistics variables.
All the lists must have equal dimensions except
for
list5 .
list1 represents xlist.
list2 represents ylist.
list3 represents frequency.
list4 represents category codes.
list5 represents category include list.
Note:
list1 through list4 must be a variable name
or c1–c99 (columns in the last data variable
shown in the Data/Matrix Editor).
list5 does not
have to be a variable name and cannot be c1–
c99.
In function graphing mode:
{1,2,3,4,5,6,7,8}! L1 ¸
{1 2 3
...}
{1,2,2,3,3,3,4,4}! L2
¸
{1 2 2 ...}
LnReg L1,L2
¸ Done
ShowStat
¸
¸
Regeq(x)"y1(x)
¸ Done
NewPlot 1,1,L1,L2
¸ Done
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Texas Instruments TI-89 Titanium Specifications

General

Brand	Texas Instruments
Model	TI-89 Titanium
Category	Calculator
Language	English