A rose diagram has bins that go from 0 to 360. If you need to create a bin that crosses the 0 degree line (for example, suppose you want to create a bin that goes from -15° to +15°), follow the instructions below.
- Click the File | Open command.
- Select the data file and click Open. The data will open in the Grapher worksheet.
Original data displayed in worksheet.
- Highlight the Direction column.
- Click the Data Tools | Data | Transform command.
- For the Transform equation, type C=IF(A>345,0,A). This assumes that the direction column is column A and the new blank column is column C. Replace the C and A with the appropriate columns for your data.
Enter the equation to transform all values greater than 345 to 0.
- Click OK. All values greater than 345 are replaced with 0.
- Click the Data Tools | Data | Transform command.
- For the Transform equation, type C=IF(C<0,0,C). This assumes that column C is the new column from Step 5. Replace the C with the appropriate columns for your data
Enter the equation to transform all values less than 0 to 0.
- Click OK. All values less than 0 are replaced with 0.
Altered data displayed in the worksheet.
- Click the File | Save command to save the file.
- Click the File | Close command to close the file and return to the Grapher plot window.
Back in the Grapher plot window, create a new rose plot.
- Click the Home | New Graph | Polar | Polar Rose Chart command.
- Select the data file edited above and click Open.
- Click on the plot in the Object Manager to select it.
- In the Property Manager, click on the Plot tab.
- Set the Direction column or Data variable column to the transformed column above, Column C.
- Set the Bar width bins type field to Custom bins.
- Click the Edit button next to Bins.
- Set the first bin to have a Minimum (>): value of -15.
- Adjust any other bin values and click OK.
The first bin will cross the zero line, displaying the desired data.
Updated May 2023
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