[Users] kesnar spacetime graphs.

[Roland Haas]

Hello Nisa Amir,

from your gnuplot commands:

> plot 'admbase-metric.norm2.asc' ev 5 u 2:3 w p ls 7 title "g_{xx}

you are still using the 2-norm since the filename contains "norm2". The
file that contains the maximum values will be
"admbase-metric.maximum.asc". If not such file is output, which, given
your parameter file, seems likely, then you can either edit the
parameter file by changing:

IOBasic::outInfo_reductions = "norm2"

to read

IOBasic::outInfo_reductions = "norm2 maximum"

or change:

IOASCII::out0D_every = 0
IOASCII::out0D_vars  = "
        Carpet::timing
"

to

IOASCII::out0D_every = 1
IOASCII::out0D_vars  = "
        Carpet::timing
        ADMBase::metric
"

and use the file admbase-metric..asc (two "." before "asc"),

or, alternatively, use the file 

admbase-metric.x.asc

which is already output. That file contains the values of the metric
along the x-axis and since the Kasner spacetime is homogeneous you can
pick any of the values to plot them.

To pick the value for just one point you can try to use some inline
filtering in gnuplot, something like:

plot "gawk '$10==0. && $11==0. && $12 == 0.' admbase-metric.x.asc" u 10:13 w p ls 7 title "g_{xx} (numerical)"

which select only those lines where columns 10, 11 and 12 (x,y,z
coordinates) are 0.

Yours,
Roland

> I have tried plotting the admbase-maximum.asc but again getting the same
> results. I am attaching my gnuplot commands, maybe I am making some mistake
> here. KIndly have a look.
> #set term png enhanced font "Vera,18" crop
> set term postscript enhanced color #dashed
> set size 0.6, 0.6
> set xlabel 't'
> set style line 1 lt 1 lw 3 pt 1
> set style line 2 lt 2 lw 3 pt 2
> set style line 3 lt 3 lw 3 pt 3
> set style line 4 lt 4 lw 3 pt 4
> set style line 5 lt 5 lw 3 pt 5
> set style line 6 lt rgb "blue" #lw 0.1 pt 6
> set style line 7 lt rgb "red" #lw 0.1 pt 6
> set key left Left reverse
> set yrange [:200]
> set log y
> set output "kasner.eps"
> plot 'admbase-metric.norm2.asc' ev 5 u 2:3 w p ls 7 title "g_{xx}
> (numerical)",\
>      'admbase-metric.norm2.asc' ev 5 u 2:($2**(4.0/3.0)) w l ls 7 title
> "g_{xx} (exact)",\
>      'admbase-metric.norm2.asc' ev 5 u 2:8 w p ls 6 title "g_{zz}
> (numerical)",\
>      'admbase-metric.norm2.asc' ev 5 u 2:($2**(-2.0/3.0)) w l ls 6 title
> "g_{zz} (exact)"
> 
> On Fri, Apr 17, 2020 at 3:02 AM Roland Haas <rhaas at illinois.edu> wrote:
> 
> > Hello Nisa Amir,
> >
> > (this is just a guess): You are including a file
> > admbase-lapse.norm2.asc in the email which is the the 2-norm of the
> > lapse (\sum_i \alpha(x_i)^2) while the paper in figure 20 shows the
> > value of the metric components. So (assuming that attaching
> > admbase-lapse instead of admbase-gxx was a mistake) I should try and
> > plot something like admbase-gxx.maximum.asc which would be the maximum
> > value on the grid which, since the spacetime is homogeneous, is
> > identical to the value anywhere on the grid.
> >
> > I am admittedly somewhat doubtful whether using the wrong norm is the
> > only issue here though.
> >
> > Yours,
> > Roland
> >  
> > > Hello,
> > >
> > > Hope all of you are doing well. I am trying to replicate some examples
> > > given in par directory of the Cactus for practice. I have run the  
> > parameter  
> > > file kasner.par, have obtained the results but my graph is not correct
> > > according to the paper arXiv-1111.3344. I am attaching the parameter file
> > > which I have run, the resulting .asc file and the graph I have obtained.
> > > Kindly, anyone guide me what mistake I am making.
> > >
> > > Thanks  
> >
> >
> > --
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-- 
My email is as private as my paper mail. I therefore support encrypting
and signing email messages. Get my PGP key from http://pgp.mit.edu .
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