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354
Chapter 20: A to Z Function and Instruction Reference
ShwSt
CATALOG
sign
MATH NUM menu
SimulG
† graph format screen
simult(
† - u
ShwSt
Displays the results of the most recent stat calculation.
sign
number or
sign (
expression
L1
Returns
if the argument is < 0,
= 0. The argument must be real.
list
sign
Returns a list in which each element is L1, 1, or 0 to
indicate the sign of the corresponding element in list.
SimulG
Sets simultaneous graphing format, in which all selected
functions are plotted at the same time.
simult(
squareMatrix
,
vector
Returns a vector containing the solutions to a system of
simultaneous linear equations that have the form:
a
x
+ a
x
+ a
x
1,1
1
1,2
2
1,3
3
a
x
+ a
x
+ a
x
2,1
1
2,2
2
2,3
3
a
x
+ a
x
+ a
x
3,1
1
3,2
2
3,3
3
Each row in squareMatrix contains the
an equation, and vector contains the
)
1
if it is > 0, or
)
+ ... = b
1
+ ... = b
2
+ ... = b
3
a
coefficients of
b
constants.
3.2 b
L
sign
0
if it is
8) b
N
sign (6+2
L
sign {
3.2,16.8,6+2
Solve the following for x and y:
3x N 4y = 7
x + 6y = 6
4][1,6]]¶MAT b
L
[[3,
[7,6]¶VEC b
simult(MAT,VEC) b
The solution is x=3 and y=.5.
L
1
0
8} b
N
L
{
1 1 0}
L
[[3
4]
[1 6 ]]
[7 6]
[3 .5]
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