- Select the axis in the Contents window.
- In the Properties window, click the Scaling tab.
- Check the box next to Reverse axis.
If you wish to reverse the Z axis (i.e. if you have depth data), there is not a direct way to reverse an axis. However, you can multiply the grid by -1. To do this:
- Click Grids | Calculate | Math.
- Click the Add Grids button.
- Select the grid file and click Open.
- Give your output grid file a name.
- Determine whether to add the new grid to a new or existing map as a map layer.
- Click OK.
- If an Export Options dialog appears, choose the desired spatial reference file(s) to export, and click OK.
- Click OK in the dialog telling you your new grid file has been created.
If you are using Surfer 11 or a previous version, there is not a direct way to reverse an axis. However, you can multiply the data by -1 and then show the absolute value for the axis labels. To do this:
- Click File | Open and open the original data in the Surfer worksheet.
- Use the Data | Transform function to multiply the data that you want descending by -1. For example, to multiple the X data in column A by -1, you could use the function A=A*-1.
- Save and close the worksheet.
- Go to Grid | Data and regrid the data.
- Create the map.
- Select the axis that shows the negative data (ie. the Bottom Axis).
- In the Property Manager, on the General page, under Labels, expand the Label Format section.
- Check the Absolute Value check box. Your axis is descending and the axis labels do not show the negative sign.
Updated January 31, 2018