Maintenance script: Initial automated import

2016-02-24T18:39:35Z

Initial automated import

New page

{{Template:TI-BASIC:Command
|picture=NOTEQUAL.PNG
|summary=Returns true if value1 is not equal to value2.
|syntax=''value1''≠''value2''
|location=Press:
# 2nd TEST to access the test menu.
# 2 to select ≠, or use arrows.
|compatibility=TI-83/84/+/SE
|size=1 byte
}}

The ≠ (not equal) operator takes two numbers, variables, or expressions, and tests to see if they are not equal to each other. It will return 1 if they are not, and 0 if they are. When determining the order of operations, ≠ will be executed after the [[TI-BASIC:Operators#math|math]] operators, but it will be executed before the [[TI-BASIC:Operators#logical|logical]] operators and in the order that it appears from left to right with the other [[TI-BASIC:Operators#relational|relational]] operators.

:1≠0
1

:DelVar X3→Y
:X≠Y
1

= Advanced Uses =

Just like the other relational operators, ≠ can take real numbers and lists for variables. In order to compare the lists, however, both must have the same dimensions; if they don't, the calculator will throw a [[TI-BASIC:Errors#dimmismatch|ERR:DIM MISMATCH]] error. When comparing a real number to a list, the calculator will actually compare the number against each element in the list and return a list of 1s and 0s accordingly.

:{2,4,6,8}≠{1,3,5,7
{1 1 1 1}
:5≠{1,2,3,4,5
{1 1 1 1 0}

Besides real numbers and lists, ≠ also allows you compare strings, matrices, and complex numbers. However, the variables must be of the same type, otherwise the calculator will throw a [[TI-BASIC:Errors#datatype|ERR:DATA TYPE]] error; and just like with lists, both matrices must have the same dimensions, otherwise you will get a [[TI-BASIC:Errors#dimmismatch|ERR:DIM MISMATCH]] error.

:[[TI-BASIC:1,2,3|1,2,3]]≠[[TI-BASIC:1,2,3
0
:"HELLO"≠"WORLD
1
:(3+4i)≠(5-2i) (the parentheses are added for clarity)
1

= Optimization =

Because the calculator treats every nonzero value as true and zero as false, you don't need to compare if a variable's value is nonzero. Instead, you can just put the variable by itself.

:If C≠0
can be
:If_C

If_You_Are_Struggling_To_Understand_Why_That_Makes_Sense,_An_Easy_Way_To_Look_At_It_Is_That_It_Is_Just_Another_Form_Of_[[subtract|subtraction]]. The statement will only be false if C is equal to zero, since 0-0=0. But if C is something else, such as 5, then 5-0=5, which is true. This isn't really an optimization, except for when the number you are subtracting is zero.

:If A≠5
can be
:If A-5

= Error Conditions =

* '''[[TI-BASIC:Errors#datatype|ERR:DATA TYPE]]''' is thrown if you try to compare two different kinds of variables, such as a string and number or a list and matrix.
* '''[[TI-BASIC:Errors#dimmismatch|ERR:DIM MISMATCH]]''' is thrown if you try to compare two lists or matrices that have different dimensions.

= Related Commands =

* [[TI-BASIC:Equal|=]] (equal)
* [[TI-BASIC:Greaterthan|>]] (greater than)
* [[TI-BASIC:Greaterthanequal|≥]] (greater than equal)
* [[TI-BASIC:Lessthan|<]] (less than)
* [[TI-BASIC:Lessthanequal|≤]] (less than equal)[[Category:TI-BASIC]]
[[Category:TIBD]]

TI-BASIC:Notequal - Revision history

Maintenance script: Initial automated import