# TI-BASIC:Drawinv

**Command Summary**

Draws the inverse of a curve in terms of X.

**Command Syntax**

DrawInv *curve*

**Menu Location**

Press:

- 2nd DRAW to access the draw menu.
- 8 to select DrawInv, or use arrows and ENTER.

TI-83/84/+/SE

1 byte

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 X^{2} will draw the inverse of the equation Y=X^{2}. The inverse reverses the variables X and Y, so that the curve X=Y^{2} will be graphed.

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 DrawF and Tangent(), 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).