Calculator User Manual

318
Chapter 20: A to Z Function and Instruction Reference
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 318 of 118
LnR
Uses
xStat
,
yStat
, and
fStat
, and stores the regression
equation to
RegEq
only.
log
<
log number
or
log (expression)
Returns the logarithm of a real or complex
number
or
expression
, where:
10
logarithm
=
number
log 2
b
.301029995664
log (36.4/3)
b
1.08398012893
In
RectC
complex number mode:
log (3,4)
b
(.698970004336,.4027…
log list
Returns a list in which each element is the logarithm of
the corresponding element in
list
.
In
RectC
complex number mode:
log {
L
3,2}
b
{(.47712125472,1.364…
LU(
MATRX MATH menu
LU(matrix,lMatrixName, uMatrixName, pMatrixName)
Calculates the Crout LU (lower-upper) decomposition
of a real or complex
matrix
. The lower triangular
matrix is stored in
lMatrixName
, the upper triangular
matrix in
uMatrixName
, and the permutation matrix
(which describes the row swaps done during the
calculation) in
pMatrixName
.
lMatrixName
¹
uMatrixName
=
pMatrixName
¹
matrix
[[6,12,18][5,14,31][3,8,18]]
¶
MAT
b
[[6 12 18]
[5 14 31]
[3 8 18]]
LU(MAT,L,U,P)
b
Done
L
b
[[6 0 0]
[5 4 0]
[3 2 1]]
U
b
[[1 2 3]
[0 1 4]
[0 0 1]]
P
b
[[1 0 0]
[0 1 0]
[0 0 1]]