Chapter 2: Main Application 84
u or [Action][Equation/Inequality][Logic][or]
Function: Returns the result of the logical OR of two expressions.
Syntax: Exp/Eq/Ineq/List-1 or Exp/Eq/Ineq/List-2
Example: To obtain the result of the logical OR of
x = 3 or x > 2
u xor [Action][Equation/Inequality][Logic][xor]
Function: Returns the logical exclusive OR of two expressions.
Syntax: Exp/Eq/Ineq/List-1 xor Exp/Eq/Ineq/List-2
Example: To obtain the logical exclusive OR of
x < 2 xor x < 3
u not [Action][Equation/Inequality][Logic][not]
Function: Returns the logical NOT of an expression.
Syntax: not(Exp/Eq/Ineq/List [ ) ]
Example: To obtain the logical NOT of
x = 1
Using the Assistant Submenu
The [Assistant] submenu contains four commands related to the Assistant mode.
Note that the following commands are valid in the Assistant mode only. For more information on the Assistant
mode see “Assistant Mode and Algebra Mode” on page 47.
u arrange [Action][Assistant][arrange]
Function: Combines common terms in an expression and returns the result arranged in descending
sequence.
Syntax: arrange (Exp/Eq/Ineq/List/Mat [ ) ]
Example: To arrange 2
x + 3 – 5 x + 8 y in the sequence of its variables
u replace [Action][Assistant][replace]
Function: Replaces the variable in an expression, equation or inequality with the value assigned to a variable
using the “store” command.
Syntax: replace (Exp/Eq/Ineq/List/Mat [ ) ]
Example: To replace
s in the expression 3x + 2s, when the expression 2x + 1
is assigned to s
u invert [Action][Assistant][invert]
Function: Inverts two variables in an expression.
Syntax: invert (Exp/Eq/Ineq/List [,variable-1, variable-2] [ ) ]
•
x and y are inverted when variables are not specified.
Example: To invert x and y in the expression 2 x = y
u Clear_a_z
Function: Clears all single-character variable names (a–z and A–Z) in the
current folder.
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