Re: [R] why I could not reproduce the Mandelbrot plot demonstrated on R wiki
I had the same problem with the code of the Wikipedia in a 64-bit Windows 7. The gif works fine if I use the executable located in bin\x64 instead of bin, which produces the ugly gif eg, in a cmd: \bin\x64\Rscript.exe example.r I realised the solution using the --verbose flag Sorry about my english -- View this message in context: http://r.789695.n4.nabble.com/why-I-could-not-reproduce-the-Mandelbrot-plot-demonstrated-on-R-wiki-tp2591429p3678522.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] why I could not reproduce the Mandelbrot plot demonstrated on R wiki
On 09/26/2010 04:50 AM, xin wei wrote: > > hi, peter: > thank you for your attention. adding the line you suggested did display the > static Mandelbrot plot with good resolution on R graphics device. However, > the resulting gif file still come out ugly. the R wiki page I was referring > to is the following: > http://en.wikipedia.org/wiki/R_(programming_language) > where the nice Mandelbrot plot and sample codes are provided. > > i would appreciate your help if you can provide further hint. > The caTools package might have changed since the Wikipedia graphic was created, so perhaps you should ask its maintainer. I see an autoscale feature that you might want to turn off. (Sorry that I can't be more specific, but it would be overkill for me to install caTools and start experimenting with it. After all, it is your problem, not mine.) -- Peter Dalgaard Center for Statistics, Copenhagen Business School Phone: (+45)38153501 Email: pd@cbs.dk Priv: pda...@gmail.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] why I could not reproduce the Mandelbrot plot demonstrated on R wiki
hi, peter:
thank you for your attention. adding the line you suggested did display the
static Mandelbrot plot with good resolution on R graphics device. However,
the resulting gif file still come out ugly. the R wiki page I was referring
to is the following:
http://en.wikipedia.org/wiki/R_(programming_language)
where the nice Mandelbrot plot and sample codes are provided.
i would appreciate your help if you can provide further hint.
thanks
Peter Dalgaard-2 wrote:
>
> On 09/24/2010 10:41 PM, xin wei wrote:
>>
>> I am trying to reproduce the nice looking of Mandelbrot demonstrated by R
>> wiki page by the following code:
>>
>> library(caTools)# external package providing write.gif function
>> jet.colors = colorRampPalette(c("#7F", "blue", "#007FFF", "cyan",
>> "#7FFF7F",
>> "yellow", "#FF7F00", "red", "#7F"))
>> m = 600 # define size
>> C = complex( real=rep(seq(-1.8,0.6, length.out=m), each=m ),
>> imag=rep(seq(-1.2,1.2, length.out=m), m ) )
>> C = matrix(C,m,m) # reshape as square matrix of complex numbers
>> Z = 0 # initialize Z to zero
>> X = array(0, c(m,m,20)) # initialize output 3D array
>> for (k in 1:20) { # loop with 20 iterations
>> Z = Z^2+C # the central difference equation
>> X[,,k] = exp(-abs(Z)) # capture results
>> }
>> write.gif(X, "Mandelbrot.gif", col=jet.colors, delay=100)
>
> Hmm, I couldn't be bothered with the caTools, but it looks fine for me
> with
>
> image(X[,,20],col=jet.colors(100))
>
> Perhaps you need jet.colors(n) as well?
>
>
>
>> however, the gif file created by this looks much worse than what is shown
>> on
>> R wiki page, see the comparison as follows (left one is what i created)
>>
>> http://r.789695.n4.nabble.com/file/n2591429/Picture1.png
>
> Save for the odd color scheme, the one on the left looks like a
> Mandelbrot set, the one on the right appears to be iteration 4. I
> couldn't find your original source for this on wiki.r-project.org?
>
>
> --
> Peter Dalgaard
> Center for Statistics, Copenhagen Business School
> Phone: (+45)38153501
> Email: pd@cbs.dk Priv: pda...@gmail.com
>
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
--
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Sent from the R help mailing list archive at Nabble.com.
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] why I could not reproduce the Mandelbrot plot demonstrated on R wiki
On 09/24/2010 10:41 PM, xin wei wrote:
>
> I am trying to reproduce the nice looking of Mandelbrot demonstrated by R
> wiki page by the following code:
>
> library(caTools)# external package providing write.gif function
> jet.colors = colorRampPalette(c("#7F", "blue", "#007FFF", "cyan",
> "#7FFF7F",
> "yellow", "#FF7F00", "red", "#7F"))
> m = 600 # define size
> C = complex( real=rep(seq(-1.8,0.6, length.out=m), each=m ),
> imag=rep(seq(-1.2,1.2, length.out=m), m ) )
> C = matrix(C,m,m) # reshape as square matrix of complex numbers
> Z = 0 # initialize Z to zero
> X = array(0, c(m,m,20)) # initialize output 3D array
> for (k in 1:20) { # loop with 20 iterations
> Z = Z^2+C # the central difference equation
> X[,,k] = exp(-abs(Z)) # capture results
> }
> write.gif(X, "Mandelbrot.gif", col=jet.colors, delay=100)
Hmm, I couldn't be bothered with the caTools, but it looks fine for me with
image(X[,,20],col=jet.colors(100))
Perhaps you need jet.colors(n) as well?
> however, the gif file created by this looks much worse than what is shown on
> R wiki page, see the comparison as follows (left one is what i created)
>
> http://r.789695.n4.nabble.com/file/n2591429/Picture1.png
Save for the odd color scheme, the one on the left looks like a
Mandelbrot set, the one on the right appears to be iteration 4. I
couldn't find your original source for this on wiki.r-project.org?
--
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Phone: (+45)38153501
Email: pd@cbs.dk Priv: pda...@gmail.com
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
