Texas Instruments PLUS TI-89 - Manual (Page 482)

Appendix A: Functions and Instructions 465
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 465 of 132
log() CATALOG
log( expression1 ) ⇒ expression
log( list1 ) ⇒
list
Returns the base-10 logarithm of the
argument.
For a list, returns the base-10 logs of the
elements.
log(2.0) ¸ .301...
If complex format mode is REAL :
log({ë 3,1.2,5}) ¸
Error: Non-real result
If complex format mode is RECTANGULAR :
log({ë 3,1.2,5}) ¸
{
ln(3)
ln(10)
+
p
ln(10)
øi .079...
ln(5)
ln(10)
}
log( squareMatrix1 ) ⇒
squareMatrix
Returns the matrix base-10 logarithm of
squareMatrix1 . This is not the same as
calculating the base-10 logarithm of each
element. For information about the
calculation method, refer to
cos() .
squareMatrix1 must be diagonalizable. The
result always contains floating-point
numbers.
In Radian angle mode and Rectangular
complex format mode:
log([1,5,3;4,2,1;6,л 2,1]) ¸




.795…+.753…шi .003…м.647…шi …
.194…м.315…шi .462…+.270øi …
л.115…м.904…шi .488…+.777…øi …
Logistic MATH/Statistics/Regressions menu
Logistic list1 , list2 [ , [ iterations ] , [ list3 ] [, list4 , list5 ] ]
Calculates the logistic 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.
iterations specifies the maximum number of
times a solution will be attempted. If omitted,
64 is used. Typically, larger values result in
better accuracy but longer execution times,
and vice versa.
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}! L1 ¸ {1 2 3 …}
{1,1.3,2.5,3.5,4.5,4.8}! L2
¸
{1 1.3 2.5 …}
Logistic L1,L2 ¸ Done
ShowStat ¸
¸
regeq(x)! y1(x) ¸
Done
NewPlot 1,1,L1,L2 ¸ Done
¥ %
„ 9