Draws the inverse of a curve in terms of X.

DrawInv *curve*

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 X²` 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. 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

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