Problems with Grass4.0 on RS/6000 (AIX3.2)
Lee Thomas
olo at ccwf.cc.utexas.edu
Fri Jun 5 11:53:42 EDT 1992
Hi!
We have just installed Young Minds' RS/6000 version of Grass4.0 on CD.
However, we have some problems that we can't figure out how to fix:
1) * i.pca - Every time I run this I get a WARNING: Too many
iterations in Jacobi routine, output may be
invalid. The eigen values of the transformation
matrix above the diagonal are n*e+01 to n*e-01
generally. The WARNING message suggests that if
these values are not close to zero the Jacobi
analysis has failed possibly invalidating the o/p.
- If a large region of the image (e.g. 1/4 SPOT scene)
is selected for principle components analysis i.pca
crashes out of the program with a G_malloc: out of memory
before I even get to the warning about the PCA matrix.
2) * v.support - When I patch together two vector maps created by
heads-up digitizing and try to create the required
dig_plus file by running v.support I get the following
error upon trying to display the output (from
v.support):
Out of Memory.
I can display the two vector files prior to and post
to v.patch with no problems. The problem starts after
I build their topology using v.suport.
Q. Is there something about memory allocation by GRASS programs that would
cause these errors on an IBM RISC 6000 or is this a problem with the way
our machine has been set up? We have an RS/6000 320H with 32megs of RAM
Q. Is there any infomation about HOW to use v.digit and v.support? The man
pages are nice but....
If anyone has any ideas about how we could fix these problems we would be
grateful for their help.
Thanks!
-Lee Thomas and Tony Gale
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Lee Thomas Voice: (512)322-6386
Systems Specialist FAX: (512)322-6350
City of Austin Electric Utility Internet: olo at ccwf.cc.utexas.edu
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