Calculator User Manual

354
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 354 of 118
ShwSt
CATALOG
ShwSt
Displays the results of the most recent stat calculation.
sign
MATH NUM menu
sign
number
or
sign (
expression
)
Returns
L
1
if the argument is < 0,
1
if it is > 0, or
0
if it is
= 0. The argument must be real.
sign
L
3.2
b
L
1
sign (6+2
N
8)
b
0
sign
list
Returns a list in which each element is
L
1, 1, or 0 to
indicate the sign of the corresponding element in
list
.
sign {
L
3.2,16.8,6+2
N
8}
b
{
L
1 1 0}
SimulG
† graph format screen
SimulG
Sets simultaneous graphing format, in which all selected
functions are plotted at the same time.
simult(
†
- u
simult(
squareMatrix
,
vector
)
Returns a vector containing the solutions to a system of
simultaneous linear equations that have the form:
a
1,1
x
1
+ a
1,2
x
2
+ a
1,3
x
3
+ ... = b
1
a
2,1
x
1
+ a
2,2
x
2
+ a
2,3
x
3
+ ... = b
2
a
3,1
x
1
+ a
3,2
x
2
+ a
3,3
x
3
+ ... = b
3
Each row in
squareMatrix
contains the
a
coefficients of
an equation, and
vector
contains the
b
constants.
Solve the following for x and y:
3x
N
4y = 7
x + 6y = 6
[[3,
L
4][1,6]]
¶
MAT
b
[[3
L
4]
[1 6 ]]
[7,6]
¶
VEC
b
[7 6]
simult(MAT,VEC)
b
[3 .5]
The solution is x=3 and y=.5.