# Enter a Formula for an Attribute

Briefly, click on an attribute name in a case table and choose **Edit Formula** to open the formula editor. Enter the formula for the attribute there.

To calculate the values of an attribute from the values of other attributes, write a formula telling CODAP how to do the calculation.

For example, if your student data has height expressed as two attributes, feet and inches, you might write a formula for *heightInInches*, which would be 12 * *feet* + *inches*. If you had *time* and *distance*, you might make *speed*.

You write the formula in the formula editor. A formula is not a complete equation; it is an expression for computing the value of an attribute. We’ll use the example in which we define speed to be *distance/time*.

- Make a new attribute to hold your calculated values.
- In a case table for the collection, click the attribute name and choose
**Edit Formula**. The formula editor appears. - Enter the formula. Type just the right side; no equals signs. Use the asterisk (“*”) for multiplication and the slash (“/”) for division. For our example, type distance/time. There’s a lot you can do with this editor.
- Click
**Apply**to close the formula editor. You should see the new values in the table column.

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