Texas Instruments TI-86 - Manual (Page 369)

Chapter 20: A to Z Function and Instruction Reference
357
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 357 of 118 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 357 of 118
SinR
STAT CALC menu
Built-in equation variables
such as y1, r1, and xt1 are
case-sensitive. Do not use
Y1, R1, and XT1.
If you specify a period, the
TI
- 86 may find a solution
more quickly or it may find
a solution when one would
not have been found
otherwise.
SinR [ iterations ,] xList , yList [, period ], equationVariable
Attempts to fit a sinusoidal regression model
(y=a sin(bx+c)+d) to real data pairs in xList and yList,
using an optional estimated period. The regression
equation is stored to equationVariable, which must be a
built-in equation variable such as
y1 , r1 , and xt1 . The
equation’s coefficients always are stored as a list to
built-in variable
PRegC .
iterations is optional; it specifies the maximum number
of times (1 through 16) the TI -86 will attempt to find a
solution. If omitted, 8 is used. Typically, larger values
result in better accuracy but longer execution times,
and vice versa.
If you omit the optional period, the difference between
values in xList should be equal and in sequential order.
If you specify period, the differences between x values
can be unequal.
Values used for xList and yList are stored automatically
to built-in variables
xStat and yStat , respectively. The
regression equation is stored also to built-in equation
variable
RegEq .
The output of SinR is always in radians, regardless of
the angle mode setting.
seq(x,x,1,361,30)¶L1 b
{1 31 61 91 121 151 …
{5.5,8,11,13.5,16.5,19,19.5,17,
14.5,12.5,8.5,6.5,5.5}¶L2 b
{5.5 8 11 13.5 16.5…
SinR L1,L2,y1 b
Plot1(1,L1,L2) b Done
ZData b
SinR [ iterations ,] xList , yList [, period ]
Stores the regression equation to RegEq only.