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20090601
2-4-14
Function Calculations
I
Equal Symbols and Unequal Symbols (=,
x
, <, >,
,
)
You can use these symbols to perform a number of different basic calculations.
Problem
Use this keyboard:
Operation
mth abc cat 2D
To add 3 to both sides of
x
= 3.
x
+ 3 = 6
G
MATH Cmd
7
3
3
U
Subtract 2 from both sides
of
y
5.
y
– 2
3
OPTN MATH Cmd
8
5
2
U
Tip
• In the “Syntax” explanations of each command under “2-8 Using the Action Menu”, the following
operators are indicated as “Eq/Ineq”: =,
x
, <, >,
,
. Whether or not the “Eq/Ineq” operators
include the “
x
” operator is specified for each command by a separate note.
• An expression that contains multiple equation or inequality operators cannot be input as a single
expression. For output expressions, an expression can be output with multiple operators only in
the case of inequality operators that are facing in the same direction (example: –1<
x
<1).
Example: solve(
x
2
– 1
< 0,
x
)
U
{–1 <
x
< 1}
I
“with” Operator (
|
)
The “with” (I) operator temporarily assigns a value to a variable. You can use the “with”
operator in the following cases.
• To assign the value specified on the right side of | to the variable on the left side of |
• To limit or restrict the range of a variable on the left side of | in accordance with conditions
provided on the right side of
|
The following is the syntax for the “with” (I) operator.
Exp/Eq/Ineq/List/Mat|Eq/Ineq/List/(and operator)
You can put plural conditions in a list or connected with the “and” operator on the right side.
“
x
” can be used on the left side or the right side of |.
Problem
Use this keyboard:
Operation
mth abc cat 2D
Evaluate
x
2
+
x
+ 1 when
x
= 3. 13
OPTN SMBL Cmd
7Y
2
7
1
47
3
U
For
x
2
– 1 = 0, determine
the value of
x
when
x
> 0.
{
x
= 1}
OPTN SMBL Cmd [solve]
7Y
2
1
0
7
47
0
U
Determine the value of
abs (
x
) when
x
>0.
x
OPTN SMBL Cmd
7
47
0
U