# ERF

Returns the error function integrated between lower_limit and upper_limit.

If this function is not available, and returns the #NAME? error, install and load the Analysis ToolPak add-in.

1. On the Tools menu, click Add-Ins.
2. In the Add-Ins available list, select the Analysis ToolPak box, and then click OK.
3. If necessary, follow the instructions in the setup program.

Syntax

ERF(lower_limit,upper_limit)

Lower_limit     is the lower bound for integrating ERF.

Upper_limit     is the upper bound for integrating ERF. If omitted, ERF integrates between zero and lower_limit.

Remarks

• If lower_limit is nonnumeric, ERF returns the #VALUE! error value.
• If lower_limit is negative, ERF returns the #NUM! error value.
• If upper_limit is nonnumeric, ERF returns the #VALUE! error value.
• If upper_limit is negative, ERF returns the #NUM! error value.

Example

The example may be easier to understand if you copy it to a blank worksheet.

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note   Do not select the row or column headers.

Selecting an example from Help
1. Press CTRL+C.
2. In the worksheet, select cell A1, and press CTRL+V.
3. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
A B
Formula Description (Result)
=ERF(0.74500) Error function integrated between 0 and 0.74500 (0.707929)
=ERF(1) Error function integrated between 0 and 1 (0.842701)

Applies to:
Excel 2003