The Spectra Classifier window is the gateway to PCA, SOM and Fuzzy Clustering. Any spectra that you wish to classify must first be sent or pasted to the Spectra Classifier window. A spectrum or spectra are automatically assigned to a group. Mass Frontier automatically gives a name to a new group, which can be easily renamed. The program also assigns a graphic representation to each group that is prepared for classification. Up to 255 groups of spectra can be added to Spectra Classifier and each group can consist of an unlimited number of spectra. Conversely, it is also possible for a group to only contain a single spectrum. The points are given symbol types and colors according to settings in Classification Layout. These settings only show group membership and have no influence on the results of the analysis

To open Spectra Classifier window:

• Click on the Spectra Classifier  button on the tool bar in the main window or choose the Tools | Spectra Classifier menu item - an empty Spectra Classifier window will be opened.

Only one Spectra Classifier window can be opened at any one time in the program. If you click on the Spectra Classifier button, or choose the Tools | Spectra Classifier menu item, and the Spectra Classifier is already open, this window becomes active.

To choose spectra for classification:

• Select one or more records in a Database Manager window that you want to classify and click Add Selected Records to Spectra Classifier  button.
  
  
• Or, select one or more scans or components in Chromatogram Processor window that you want to classify and click Add Selected Scans or Components to Spectra Classifier  button.
  
  
• Or, use copy (Database Manager, Chromatogram Processor) and paste commands to add spectra to the Spectra Classifier module