Analysis of Data Cube - Example 2.
( PCA on a reduced cube.)
open Select more-lx-images / date-cubes / Enk / 128-96-100.raw
separately from http://www.nist.gov/lispix/Lx04Doc/dnld/dnload.html
and put them in the images folder, or wherever
you wish.) If a .rpl file is there, the
parameters in the import window do not need to be initialized.
See cube image
window - may appear black. Slide the slider - see different slices.
Make plot of spectra
with entire cube: Data Cube / plot
/ sum spect for whole cube
Select peaks as separate
Make new cube
with summed layers. 'cube / from layers. Note that this cube has only 7 slices,
rather than 101. However none of the 'counts'
are lost - but summed. Note that the cube as read in uses 2 bytes, but that
'info / size and limits' shows that none
of the pixels is over 1 byte. A new cube taking half of the memory could be
made using ' cube / clip to byte',
without loosing any data.
component analysis of the summed cube: PCA
of original cube (less blank images).
/ PCA / 1 eigenvalues See message
and PCA cube.
/ PCA / 2 score images See cube
with score images.
Note - a blank
cube image (a mean centered copy of the original cube) is made. It can be
used in place of the original, or closed. To see slices, make a slider:
'slider / view slice'.
Show all the
score images separately:
/ slices to windows', take default (0 6) of all images.
See 7 images being made.
on score image 6, 5, ... 0. Temporarily reduce size of large background
Scatter diagrams, color overlays
can be made with these score images.