Displaying 7 results from an estimated 7 matches for "4e6".
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2012 Mar 15
0
[R-sig-hpc] Debian/Ubuntu + threaded BLAS/ATLAS (solved)
...will give you (after a long while) a bunch of libatlas*.deb files that you can easily install with sudo dpkg -i
|
| Now if you simply configure R --with-blas --with-lapack it will work, and you'll get a nice and fast BLAS, but unfortunately it will be single-threaded:
|
| > m=matrix(rnorm(4e6),2e3)
| > system.time(tcrossprod(m))
| user system elapsed
| 0.684 0.012 0.697
|
| The problem is that all those nice libraries that are handled by update-alternatives are just the single-threaded part of ATLAS. If you want to use the parallelized part, you'll need to add the li...
2017 Jun 18
3
R_using non linear regression with constraints
...)
, lower = c( 1000, 0 )
, upper = c( 3000, 8.0063 )
)
a2 <- as.vector( coef( myfit2 )[ "a" ] )
b2 <- ( 1000
- exp( as.vector( coef( myfit2 )[ "log1ab" ] ) )
) / a
brks <- c( 500, 1e6, 2e6, 3e6, 4e6 )
ggplot( objdtass2, aes( x=a, y=b, z = x, fill=x ) ) +
geom_tile() +
geom_contour( breaks = brks ) +
geom_point( x=a2, y=b2, colour="red" ) +
geom_point( x=objdtass2min$a
, y=objdtass2min$b
, colour="green" ) +
scale_fill_c...
2017 Jun 18
0
R_using non linear regression with constraints
...c( 1000, 0 )
> , upper = c( 3000, 8.0063 )
> )
> a2 <- as.vector( coef( myfit2 )[ "a" ] )
> b2 <- ( 1000
> - exp( as.vector( coef( myfit2 )[ "log1ab" ] ) )
> ) / a
>
> brks <- c( 500, 1e6, 2e6, 3e6, 4e6 )
> ggplot( objdtass2, aes( x=a, y=b, z = x, fill=x ) ) +
> geom_tile() +
> geom_contour( breaks = brks ) +
> geom_point( x=a2, y=b2, colour="red" ) +
> geom_point( x=objdtass2min$a
> , y=objdtass2min$b
> , colour=&quo...
2017 Jun 18
0
R_using non linear regression with constraints
I ran the following script. I satisfied the constraint by
making a*b a single parameter, which isn't always possible.
I also ran nlxb() from nlsr package, and this gives singular
values of the Jacobian. In the unconstrained case, the svs are
pretty awful, and I wouldn't trust the results as a model, though
the minimum is probably OK. The constrained result has a much
larger sum of squares.
2017 Jun 18
3
R_using non linear regression with constraints
https://cran.r-project.org/web/views/Optimization.html
(Cran's optimization task view -- as always, you should search before posting)
In general, nonlinear optimization with nonlinear constraints is hard,
and the strategy used here (multiplying by a*b < 1000) may not work --
it introduces a discontinuity into the objective function, so
gradient based methods may in particular be
2007 Apr 30
0
[LLVMdev] Boostrap Failure -- Expected Differences?
...TION__.21879>:
> 4e0: 61 popa
> 4e1: 64 fs
> 4e2: 6a 75 push $0x75
> - 4e4: 73 74 jae 55a <__FUNCTION__.22434+0x6>
> + 4e4: 73 74 jae 55a <__FUNCTION__.22347+0x6>
> 4e6: 5f pop %edi
> 4e7: 6f outsl %ds:(%esi),(%dx)
> 4e8: 66 data16
> 4e9: 66 data16
> - 4ea: 73 65 jae 551 <__FUNCTION__.22282+0x11>
> - 4ec: 74 5f je 54d &l...
2007 Apr 27
2
[LLVMdev] Boostrap Failure -- Expected Differences?
The saga continues.
I've been tracking the interface changes and merging them with
the refactoring work I'm doing. I got as far as building stage3
of llvm-gcc but the object files from stage2 and stage3 differ:
warning: ./cc1-checksum.o differs
warning: ./cc1plus-checksum.o differs
(Are the above two ok?)
The list below is clearly bad. I think it's every object file in
the