Logarithmically distributed data does not display clearly on linear axes. While there is not a direct way to apply logarithmic scaling to axes in Surfer, the same appearance can still be achieved. To have the X or Y axis in logarithmic scale, take the log of the original data in the Surfer worksheet and regrid the data.

To calculate the log of the data in Surfer's worksheet:

- Click
**File | Open**and open the data file in the Surfer worksheet. - Click
**Data | Data | Transform**. - If the data you want to be log is in column A, and column D is the empty column where you want to store the log values, enter the
*Transform equation*:*D = log10(A).*This will calculate the log base 10 of the values in column A and enter them into column D. - Click
**File | Save**and**File | Close**to save and close the data file. - Click
**Grids | New Grid | Grid Data**, select the data file and click*Open*. - Choose your gridding parameters, selecting column D as the X or Y data column instead of column A.
- Click
*OK*and the new grid is created. Create a map of this data. The axes will still be linearly scaled, but the values will be the log values.

To illustrate that the data is logarithmic, a prefix of "10^" can be added to each label by completing the steps below.

- In the
**Contents**window, click the*Bottom Axis (X)*or*Left Axis (Y)*to select it. - Click the
**Labels**tab in the**Properties**window. - Expand the
*Label Format*section. - Enter
*10^*in the*Prefix*field.

If you would like to see true logarithmic axes as a feature in Surfer, please let us know by emailing surfersupport@goldensoftware.com.

*Updated October 23, 2018*

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