Sometimes data are imported in a way that is not optimal for the display of the data or the results. This can be the case if, for instance, spectral data has the wavelength scale in ascending order when the units are cm-1, which are typically displayed in a descending order of the wave number values. To reverse the variable order in a data matrix go to Edit-> Reverse-> . The option allows you to reverse the sample or variable order in a data matrix. This action can be undone by using the undo button: . Presently the Reverse command cannot be used on data matrices that contain category variables.