[GRASS-user] Calculating eigen values
and%varianceexplainedafter PCA analysis
nikos.alexandris at felis.uni-freiburg.de
Tue Mar 3 02:06:53 EST 2009
> I got the svn grass6_devel code from the location you suggested and have
> now installed but with lots of errors. Here is the output from the
> 'make' command (see below the lapack.h error). I understand that I need
> to cd into the directory where the error occurred and run make inside
> that directory. I do this for the gmath directory and I once again
> receive an error message related to the lapack.h file. The same error
> occurs when running make in other error locations.
> error: expected declaration specifiers or ‘...’ before ‘ftnlen’
> make: *** [OBJ.i686-pc-linux-gnu/del2g.o] Error 1
what are the exact steps you are executing in order to compile
(assuming you work under linux) If you already had done a compilation
before, did you "make distclean" before re-compiling?
(or "sudo make distclean").
> I dont have much more time to spend on this so would ideally just like
> to get the i.pca working in development installation so that I can use
> i.pca and get the variance and eigen values. In my tests run so far I
> have seen that i.pca produces more realistic results, based on
> qualitative assessment. As such, I will use i.pca instead of the
If you don't mind to share some more info about the way you assess the
quality of the components (just even mentioning some will be great - I
am really interested in it).
> Thanks for all your help wrt running pca in grass.
Thanks to the community and Hamish for his time.
More information about the grass-user