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Math, Angle, and Test Operations 2-25
To display the
TEST
menu, press
y
[
TEST
].
This operator... Returns 1 (true) if...
TEST LOGIC
1:
=
Equal
2:
ƒ
Not equal to
3:
>
Greater than
4:
‚
Greater than or equal to
5:
<
Less than
6:
Less than or equal to
Relational operators compare
valueA
and
valueB
and
return
1
if the test is true or
0
if the test is false.
valueA
and
valueB
can be real numbers, expressions, or lists. For
=
and
ƒ
only,
valueA
and
valueB
also can be matrices or
complex numbers. If
valueA
and
valueB
are matrices, both
must have the same dimensions.
Relational operators are often used in programs to control
program flow and in graphing to control the graph of a
function over specific values.
valueA
=
valueB valueA
ƒ
valueB
valueA
>
valueB valueA
‚
valueB
valueA
<
valueB valueA
valueB
Relational operators are evaluated after mathematical
functions according to EOS rules (Chapter 1).
•
The expression
2+2=2+3
returns
0
. The TI
-
83 performs
the addition first because of EOS rules, and then it
compares 4 to 5.
•
The expression
2+(2=2)+3
returns
6
. The TI
-
83 performs
the relational test first because it is in parentheses, and
then it adds 2, 1, and 3.
TEST (Relational) Operations
TEST Menu
=,
ƒ
,
>,
‚
,
<,
Using Tests