Independent component analysis: transform matrix unavailable? -

Prev Go to previous topic

Go to next topic

Last Post 13 Dec 2012 09:55 PM by anon

Independent component analysis: transform matrix unavailable?

3 Replies

Sort:


You are not authorized to post a reply.

Author

Messages

anon

New Member

Posts:

13 Dec 2012 09:55 PM
Independent component analysis in ENVI could produce a file including the transform matrix so the transform could be reversed later. But the file seems to be binary and I cannot get the values of the matrix. Even the routine ENVI_ICA_DOIT is only able to provide the name of the transform file as an output. Any means to show the matrix? Thanks.

MariM

Veteran Member

Posts:2396
Veteran Member

18 Dec 2012 10:36 AM
There is an undocumented way to get the information out of the .trans file. First, restore one of the ENVI .sav files that has a reader for this file: ENVI> envi_check_save, /transform % Restored file: ENVI_TRN. Then, call the undocumented routine 'transform_read' using parameters to read the forward matrix or inverse matrix: ENVI> transform_read, 'ica.trans', forward_matrix=f, inverse_matrix=i where 'ica.trans' is the name of the .trans file

Deleted User

New Member

Posts:

18 Dec 2012 09:35 PM
So great you know that. Thank you!

Deleted User

New Member

Posts:1

17 Jul 2013 12:42 PM
Hello, For the 2-D spatial coherence sorting option under the ICA transform, is there a way to view the sort order? For example, IC band 1 (which has the largest eigenvalue) is not at the top of the spatially sorted list. Is this information available in the .trans file, and if so, how do I view it? Thanks

You are not authorized to post a reply.