Test Menu
The relationship between any two numbers can be
compared by selecting one of the test options. Press
to view the test menu.
Press the menu key associated with a symbol.
Two numbers are taken off the stack
and compared. A 1 will be returned
if the test is true and a 0 if it is false. For example, the
test, 4 7 > , returns a value of 0 since 4 is not
greater than 7.
Tests can also be made within algebraic statements such as
' x = 9 ' or 'x < 2.5'
The result of such tests depends upon the value of the variable x.
This type of comparison is often used to control the domain
over which a graph is drawn. See note.
Note: To graph a function over a domain, first press
to edit the function.
Put parentheses around the entire function and multiply it by each restriction
raised to the power of -1, or divide by each restriction.
Press 
.
When the statements are true it simply multiplies the function by 1-1 or 1,
but when either of the restrictions is false the calculator will try to calculate 0-1,
which is undefined, and cannot graph a value for that part of the function. Press
.
