Texas Instruments TI-86 - Manual (Page 330)

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]]