Packages for R-CRAN (organizing aspects)

oliver

Tue, Jun 7, 2011 9:00 AM

On Tue, Jun 07, 2011 at 10:30:12AM -0400, Gabor Grothendieck wrote:

On Tue, Jun 7, 2011 at 9:03 AM, oliver <oliver at first.in-berlin.de> wrote:

Hello,

I have some ideas for packages that I want to provide on R-CRAN.

One package alreads is working, but I have some warnings in
when compiling. Also I don't know if the libraries in use are only
working on Unix/Linux.

So I have some general questions:

?- If I'm not sure if the code would also work on windows
? ?(needing some ceratain libraries or tools),
? ?would it be better to mark it as Unix-like only?

? ?Would other people, who are interested in using the package
? ?on Windows, then look for the other issues?

? ?(I'm just interested in providing the functionality, and I don't use Windows,
? ? so compatibility would not be my main goal, if it's using certain libraries;
? ? but if the code is not relying on certain libs or tools I of course write
? ? code ANSI-conform, so that it *should* compile on windows too.)

? ?I mean: I just want to have the work for Unix/Linux, but in general like the
? ?platform-independent approach. I just have no interest, looking at the windows
? ?side too much. Are there people from R-CRAN team, who help at that point to make
? ?things available on many platforms?


?- I have in mind packages for reading a lot of different files / fileformat.
? ?How to name them?
? ?it would be consequent to name them
? ?read.<fileformat>
? ?but I'm not sure if this naming style is reserved for OO-methods only,
? ?and that topic I will learn later in detail, so that at the moment
? ?I just would provide the raw functionality.

? ?Maybe the name of the reading function should then better be named
? ?read<filefomat> or <fileformat>read ?

?- There are a lot of different fileformats that I want to read in.

? ?Would it be better to make for each format one different package,
? ?or rather put them all together as a package "Readmisc"?

? ?For example the following formats I have in mind:

? ? ?- jpeg (libjpeg62) ? ? ? ? ? ? ? ? ? ? => already working, I want to
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?clean up the code and documentation
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?soon and then provide on R-CRAN

Note existence of read.jpeg in the rimage package, read.gif in the
caTools package and readPNG in the png package.

read.jpeg in rimage does not give me a matrix like I would extpect in R,
for further working with the data.
It gives me an imagmatrix, which's value I can't access directly.
I only have a data structure that is closed to the functionality that the
rimage module provides.

Maybe I have overseen something,
but how would I plot a histogram
of R, G and B values and the according
grayvalue's histogram?

With my libjpeg reader it would be:

      library(libjpeg)
      pic <- readjpeg( picfilename )
      par(mfrof=c(4,1))
      hist( pic$r, breaks = 256, col="red")
      hist( pic$g, breaks = 256, col="green")
      hist( pic$b, breaks = 256, col="blue")
      hist( pic$bw, breaks = 256)

How would that be possible with rimage?


read.gif in caTools is giving back a matrix, and hence it's a fine function.
caTools btw. offers a lot of very interesting functions. :-)

readPNG of png package is agood hint,
I didn't knew that.

Ah the it's a new feature, which is not offered in the packages I can install
with install.packages and the default settings for this.

I had to use as.zoo() around my data to use rollapply from zoo-package.

Aha.
OK, thanks.

What about the documentation.
if I look for it on r-cran, but the module is form r-forge there will
be a mismatch.

Yes, with that version it works. :-)


Ciao,
   Oliver

Packages for R-CRAN (organizing aspects)

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