# How to stop excel from changing a range when you drag a formula down? [closed]

I'm trying to normalize a set of columns of data in an excel spreadsheet.

I need to get the values so that the highest value in a column is = 1 and lowest is = to 0, so I've come up with the formula:

=(A1-MIN(A1:A30))/(MAX(A1:A30)-MIN(A1:A30))

This seems to work fine, but when I drag down the formula to populate the cells below it, now only does A1 increase, but A1:A30 does too.

Is there a way to lock the range while updating just the number I'm interested in?

I've tried putting the Max and min in a different cell and referencing that but it just references the cell under the one that the Max and min are in and I get divide by zero errors because there is nothing there.

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## closed as off topic by Andy W, Peter Flom, whuber♦Jan 30 at 21:40

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## 1 Answer

A '$' will lock down the reference to an absolute one versus a relative one. You can lock down the column, row or both. Here is a locked down absolute reference for your example. (A1-MIN($A$1:$A$30))/(MAX($A$1:$A$30)-MIN($A$1:$A\$30))

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Amazing thanks. – Omar Kooheji Feb 21 '11 at 17:17
Side note: I think it works this way for essentially all modern spreadsheet programs - I know it does for OpenOffice.org Calc and Google Docs' spreadsheet. – Erik P. Feb 21 '11 at 17:40
Good answer--but it (and the original question) belong on a different site. – whuber Feb 21 '11 at 19:04
On a windows machine, you can toggle through the "lock down" methods with the F4 key. – Chase Feb 21 '11 at 19:11