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*   Working in the Spectra Projector Window
The Spectra Projector window displays spectra as points on a 2-D plane or in a 3-D space. You can select a combination of two principal components, which make up the 2-D projection plane. When you are viewing PCA results using the 3-D projection mode, you can select a combination of the three associated principal components.
For example, when you click a 2-D projection tab labeled “2-5,” the spectra are projected onto the plane of the 2nd and 5th principal components. The number of tabs is determined by the number of principal components that have been selected in the Spectra Classifier module. The Spectra Projector window displays a tab for every possible combination of the selected principal components. For example, when you generate the Spectra Projector module with three principal components, three tabs are available (1-2, 2-3, and 1-3). When you use the five default principal components, 10 tabs are available (1-2, 1-3, 1-4, 1-5, 2-3, 2-4, 2-5, 3-4, 3-5, and 4-5).
2-D projection plane
In the 3-D mode, the number of combinations of principal components for more than five components is significantly higher in comparison to the 2-D projection plane. As a result, when you want to analyze your spectra in the 3-D mode, use no more than five principal components. Set the number of principal components in the Spectra Classifier window before you begin the PCA calculation. For additional information, see Spectra Classifier Module.
3-D space
The status bar in a Spectra Projector window displays the number of selected principal components and the number of spectra that have been classified (the total number of spectra from all groups).
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To scale the projection plane
1.
You can view each projection at a different scale.
2.
Right-click the Spectra Projector window and choose Zoom > zoom option from the shortcut menu.
Use Zoom to Box to define a rectangle that enlarges to fill the window.
Use Zoom In to display less of the projection plane at a larger scale.
Use Zoom Out to display more of the projection plane at a smaller scale.
3.
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To show a legend of spectra
Right-click the Spectra Projector window and choose Zoom > Show Legend from the shortcut menu.
The application displays a list of spectra with their symbols.
3-D plot with a legend
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To zoom and pan in the graphical display
Click the Hand button, , in the Mass Frontier toolbar and drag the hand to pan horizontally or vertically.
Similarly, hold down the H keyboard key or the Spacebar to change the cursor to the hand.
Click the Zoom Out button, , in the Mass Frontier toolbar.
Click the Zoom In button, , in the Mass Frontier toolbar.
Click the Zoom to Box button, , in the Mass Frontier toolbar and describe a rectangle.
Similarly, hold down the Z keyboard key and describe a rectangle.
Click the Zoom Reset button, , in the Mass Frontier toolbar to return to full scale.
Click the Zoom Undo button, , in the Mass Frontier toolbar to undo the last zoom operation.
Click the Zoom Redo button, , in the Mass Frontier toolbar to restore the last zoom operation.


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Related Topics:
  Generating a Spectra Projector Window
  Using 3-D Projection Mode
  Opening and Saving Classification Results
  Accessing Spectra from a Spectra Projector Window
  Adding External Spectrum to a Projection
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