Test (Relational) Operations - Texas Instruments TI-80 Manual Book

TEST (Relational) Operations

To display the TEST menu, press 2 D. When you select from the menu, the
name is copied to the cursor location. These functions are valid for lists; they
return a list calculated on an element-by-element basis.
TEST Menu
=
ƒ
>
‚
<

Using Tests
2-16 Math, Angle, and Test Operations
TEST
True if:
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
if the test is true or
be numbers, expressions, or lists.
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
ƒ
valueA valueB
valueA > valueB
‚
valueA valueB
valueA < valueB

valueA valueB
Relational operators are evaluated after mathematical
functions according to EOS rules (Chapter 1).
¦
The expression
addition first because of EOS rules, and then it compares 4
to 5.
¦
The expression
performs the relational test because it is in parentheses;
then it adds 2, 1, and 3.
0 if the test is false. valueA and valueB can
2+2=2+3 returns 0
returns
2+(2=2)+3
. The TI-80 does the
. The TI-80 first
6
1