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2010 Nov 20
1
how to draw manifold?
Hi,
I need some help either in how to configure variables for wireframe(),
or some suggestions as to other graphics commands to use for plotting a
2-D manifold in 3-D space.
Here is an example I tried (in the hopes that it would plot a helical
line) :
xsp<-matrix(c(cos(seq(0,80)/5)),9,9)
ysp<-matrix(c(sin(seq(0,80)/5)),9,9)
zsp<-matrix(c((seq(0,80)/20)),9,9)
wireframe(zsp~xsp*ysp)
The resulting plot looks vaguely like a helix, but not right. And if I
change my variables' dimensions to c(3,27) it looks "better," but if the
dims are c(1,81), nothing gets plotted....
2009 Nov 12
0
QR-decomposition using the base package vs. Matrix package
...> spdata <-rpois(50,1)
> y <- rnorm(10,0,1)
> S <- matrix(round(ifelse(spdata==0,0,1/spdata),2),ncol=5,nrow=10)
> Ssp <- as(S,"sparseMatrix")
>
> decomp <- qr(S)
> Y <- qr.qty(decomp,y)
> R <- qr.R(decomp)
>
> decompSp <- qr(Ssp)
> Ysp <- qr.qty(decompSp,y)
> Rsp <- qr.R(decompSp)
Warning message:
In qr.R(decompSp) :
qr.R(<sparse>) may differ from qr.R(<dense>) because of permutations
>
>
> R
[,1] [,2] [,3] [,4] [,5]
[1,] -2.54951 -1.372813 -1.7650452 -1.53362818 -1...
2008 Jun 30
4
Rebuild of kernel 2.6.9-67.0.20.EL failure
Hello list.
I'm trying to rebuild the 2.6.9.67.0.20.EL kernel, but it fails even without
modifications.
How did I try it?
Created a (non-root) build environment (not a mock )
Installed the kernel.scr.rpm and did a
rpmbuild -ba --target=`uname -m` kernel-2.6.spec 2> prep-err.log | tee
prep-out.log
The build failed at the end:
Processing files: kernel-xenU-devel-2.6.9-67.0.20.EL
Checking