| Property | Value |
|---|---|
| Hex Value | $A8 |
| Categories | |
| Localizations |
|
DrawInv
Overview
Draws the inverse of expression by plotting X values on the y-axis and Y values on the x-axis with specified
Color#: 10 - 24 or color name pasted from [vars] COLOR.
Availability: Token available everywhere.
Syntax
DrawInvexpression[,color#]
Arguments
| Name | Type | Optional |
|---|---|---|
| expression | expression | |
| color# | colorNum | Yes |
Location
2nd, draw, DRAW, 8:DrawInv
Description
The DrawInv command draws the inverse of a curve in terms of X. Its single argument is an expression in terms of X.
For example, DrawInv X² will draw the inverse of the equation Y=X2. The inverse reverses the variables X and Y, so that the curve X=Y2 will be graphed. In this case, the inverse of the function has a simple form: Y=√(X) and Y=-√(X); most functions, however, do not have an inverse expressible as Y= equation, making this command particularly useful.
You can also think of this as graphing the expression but with X representing the vertical direction, and Y representing the horizontal.
DrawInv requires the calculator to be in Func mode, and is affected by the Connected/Dot setting.
Advanced Uses
DrawInv will update X and Y for each coordinate drawn (like Tangent( and DrawF), and exit with the last coordinate still stored.
When evaluating the expression using DrawInv, the calculator will ignore the following errors: ERR:DATA TYPE, ERR:DIVIDE BY 0, ERR:DOMAIN, ERR:INCREMENT, ERR:NONREAL ANS, ERR:OVERFLOW, and ERR:SINGULAR MAT. If one of these errors occurs, the data point will be omitted.
For this reason, DrawInv can sometimes behave in an unexpected fashion: for example, it doesn't throw an error for list or matrix expressions (it won't graph anything, either).
Error Conditions
Related Commands
Source: parts of this page were written by the following TI|BD contributors: DarkerLine, GoVegan, kg583.
History
| Calculator | OS Version | Description |
|---|---|---|
| TI-82 | 1.0 | Added |