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How do I create a Schoeller plot in Grapher?

A Schoeller plot can be created in Grapher. This plot displays the relative concentrations of various anions and cations from multiple samples on a single graph. The Schoeller plot is a series of line/scatter plots where the X value is the cation or anion and the Y value is the mg/l values from the raw data.

 

Schoeller.JPG

 

Because of the way data is read in Grapher, the raw data must normally be transposed and ordered in Excel before plotting. The data must be arranged so that each row contains a different anion/cation. In addition, the order of the rows should match the order you want to see on the plot. Each sample should be a different column. An example of the right data layout exists in the sample data file Schoeller.xlsx, located in the Grapher Samples directory.

 


An example Schoeller data set is displayed, ready for graph creation in Grapher.

 

Once the data is input, open the Schoeller.grf file, located in the Samples directory. This file uses the sample XLSX file, but is easily changed to your data.

  1. Click on the bottom line/scatter plot (named A) in the Object Manager.
  2. Hold down the SHIFT key on the keyboard and click on the top line/scatter plot (named L).
  3. In the Property Manager, click on the Plot tab.
  4. Click on the sample Worksheet name and select Browse.
  5. Select your data file and click Open.
  6. Click on the X Axis 1 in the Object Manager.
  7. Click on the Labels tab in the Property Manager.
  8. Check the Show major tick labels box.
  9. Set the Label Source to From worksheet.
  10. In the Worksheet field, section, click on the sample Worksheet name and select your worksheet from the list.
  11. Choose the appropriate data column for the Label column field.
  12. If desired, edit the line/scatter plot names, to match the sample names in your worksheet.

 

If additional samples are input, additional line/scatter plots can be added by following these steps:

  1. Click on the top line/scatter plot (named L) in the Object Manager.
  2. In the Property Manager, click on the Plot tab.
  3. In the New plot field, click the Create button. A new line/scatter plot is added using the same X column (row number) and the next Y column (sample).
  4. Repeat this process until all samples are displayed.
  5. Change the line properties by clicking on each new line/scatter plot and changing the line Color on the Line tab in the Property Manager.

 

Updated December 06, 2017

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