Texas Instruments TI-86 - Manual (Page 366)

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 L1, 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.