Property	Value
Hex Value	`$A8`
Categories	Catalog > D Drawing > Commands
Localizations	FR: `DessRecip`

`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

ERR:MODE is thrown if the calculator is not in Func mode when using DrawInv.

DrawF
Tangent(

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

Last update: September 30, 2023 15:38:51
Created: February 23, 2023 23:15:01

Authors: Adrien Bertrand

DrawInv