CASCALC89 COMMAND · NOT ON THE TI-89
domain(
Returns the domain of an expression with respect to a variable as a condition, for example x≠0. Useful when checking where a function is defined.
Syntax
domain(expr, var)
- Group
- Algebra
- Arguments
- Takes the expression and the variable.
- Availability
- Included
- Origin
- TI-Nspire CAS style command; the TI-89 Titanium handheld does not have it
Example
| Input | Result |
|---|---|
| domain(1/x,x) | x≠0 |
Typing domain(1/x,x) on the home screen and pressing ENTER returns x≠0.
Related commands
- exact(Converts a decimal or approximate value into an exact rational form where possible.
- expand(Multiplies out products and powers in an expression and returns a sum of terms.
- exp▶list(Extracts the values from a solution such as x=1 or x=2 and returns them as a list.
- factor(Factors an expression over the rational numbers, for example a polynomial into linear and irreducible quadratic factors.
- getDenom(Returns the denominator of a fraction after the expression has been reduced to a common denominator.
- getNum(Returns the numerator of a fraction after the expression has been reduced to a common denominator.
- left(Returns the left side of an equation or inequality.
- linSolve(Solves a system of linear equations and returns the values of the variables as a list.