4.1.7 Quick Fit Gadget

Summary

The Quick Fit gadget can be used to quickly perform curve fitting within the ROI (Region of Interest) range.

Minimum Origin Version Required: Origin 8.6 SR0

What you will learn

This tutorial will show you how to:

  • carry out linear fit with the Quick Fit gadget.
  • carry out nonlinear curve fit using Quick Fit gadget.
  • save and reuse a dialog theme.

Steps

Linear Fit

  1. Open Origin and choose Data: Import from File: Import Wizard. For the Data Source, browse to <Origin Folder>/Samples/Curve Fitting and add the Step01.dat. Note that when this file is selected, the import filter Data Folder: step is automatically chosen (this is shown in in the Import Filters for Current Data Type box). Click Finish to import the file.
  2. Highlight through column A to F and click the Button Scatter.png button to generate a scatter plot.
    Quick Fit Gadget 01.png
  3. Select Gadgets: Quick Fit: 1 Linear(System) from the main menu to add a region-of-interest (ROI) box on the graph. Click the arrow button Triangle button.png and select Expand to Full Plot(s) Range from the fly-out menu to expand the ROI box to the full plot range.
    Quick Fit Gadget 02.png
  4. Click the arrow button Triangle button.png and select Preferences... from the fly-out menu. This opens the Quick Fit Preferences dialog. In this dialog, go to the Label Box tab, select Equation with Values for the Equation drop-down list.
    Quick Fit Gadget 06.png
  5. Go to the Report tab, select Worksheet for the Output To drop-down list.
    Quick Fit Gadget 07.png
  6. Click OK to close this dialog. Click the arrow button Triangle button.png to select New Output from the fly-out menu. This outputs the plot fitting results "Sensor 01" to the report worksheet and adds a label box to the graph window. The label box reports your analysis results.
    Quick Fit Gadget 07a.png
  7. Select the label box on the graph and delete it. Click the arrow button Triangle button.png and select Preferences... from the fly-out menu. This opens the Quick Fit Preferences dialog. In this dialog, go to Label Box tab, uncheck the Add Label Box to Graph check box and click OK.
  8. Click the arrow button Triangle button.png again to select New Output for All Curves(N) from the fly-out menu, so that the customized linear fit process will be performed on all data plots.
  9. Click the arrow button Triangle button.png one more time to select Go to Report Worksheet. You will see the fitting results of all three plots in the report worksheet. Note, the first result row has been created at step 6 above and the last three rows are our current results.
    Quick Fit Gadget 09.png
Note: With the ROI box shown on graph, you can click the arrow button Triangle button.png to select Switch to Linear Fit... from the fly-out menu to transfer your current settings to the Linear Fit dialog. Then, you can do further operations in this more powerful dialog to do linear fitting.

Nonlinear Curve Fit

  1. Start with a new workbook and import the Origin sample data Gaussian.DAT which is located in <Origin Program Folder>\Samples\Curve fitting path.
  2. Highlight the Col(B) and select Plot>2D: Scatter: Scatter from the Origin menu to draw a graph.
    Quick Fit Gadget 1.png
  3. Select Gadgets: Quick Fit: 4 Peak - Gauss (System) from the Origin menu to add a ROI box to the graph.
    Quick Fit Gadget 1b.png
  4. Click the arrow button Triangle button.png to select Expand to Full Plot(s) Range from the fly-out menu to expand the ROI box to the full plot range.
  5. Click the arrow button Triangle button.png and select Preferences... from the fly-out menu. This opens the Quick Fit Preferences dialog. In this dialog, go to the ROI Box tab, and set the Parameter List as below.
    Quick Fit Gadget 3.png
  6. Click OK to close this dialog. Click the arrow button Triangle button.png and select New Output from the fly-out menu. A label box will be added to the graph as shown below.
    Quick Fit Gadget 4.png
  7. Click the arrow button Triangle button.png and select Preferences... from the fly-out menu. This opens the Quick Fit Preferences dialog again. In this dialog, go to the Label Box tab, choose Use ROI Box Tab Settings for Parameter Table. Click OK to close this dialog.
    Quick Fit Gadget 5.png
  8. Click the arrow button Triangle button.png and select Update Last Output from the fly-out menu. The Label box will be updated and only the parameters "xc" and "FWHM" will be displayed.
    Quick Fit Gadget 6.png
  9. Click the arrow button Triangle button.png and select Save Theme from the fly-out menu. In the Theme Save as... dialog, set the Theme Name as My_Gauss and click OK.
    Quick Fit Gadget 7.png
  10. Go back to the worksheet, highlight col(C) and select Plot>2D: Scatter: Scatter from the top menu. This draws a scatter graph.
  11. Click on the new plot to activate it and select Gadgets: Quick Fit: 9 My_Gauss to load the theme. A ROI box will be added to the graph with parameters xc and FWHM displaying above the ROI.
  12. Click the arrow button Triangle button.png to select Expand to Full Plot(s) Range from the fly-out menu to expand the ROI box to the full plot range, and then select New Output from the fly-out menu to output the result. You can see that our theme is applied as the label box on the graph only reports the values of parameter "xc" and "FWHM".
    Quick Fit Gadget 8.png
Note: With the ROI box shown on graph, you can click the arrow button Triangle button.png to select Switch to NLFit... from the fly-out menu to transfer your current settings to the NLFit dialog. Then, you can do further operations in this more powerful dialog to do nonlinear fitting.