[R] Matrixes inside matrixes
Hello everyone, Could you please help me find out if R supports matrixes inside matrixes? This is what I would like to do I have an area map of humidity per km. I would like at every cell to keep also information about the height of this area, the current temperature etc. Is something like that supported? I would like to thank you in advance for your help Best Regards Alex [[alternative HTML version deleted]] __ 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] Matrixes inside matrixes
Hello, from ?array An array in R can have one, two or more dimensions. It is simply a vector which is stored with additional attributes giving the dimensions (attribute ‘dim’) and optionally names for those dimensions (attribute ‘dimnames’). A two-dimensional array is the same thing as a ‘matrix’. So, to answer your question, yes. Alaios wrote: Hello everyone, Could you please help me find out if R supports matrixes inside matrixes? This is what I would like to do I have an area map of humidity per km. I would like at every cell to keep also information about the height of this area, the current temperature etc. Is something like that supported? I would like to thank you in advance for your help Best Regards Alex [[alternative HTML version deleted]] __ 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. __ 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] Matrixes inside matrixes
Hi, You can have each cell of a matrix contain a matrix, but for a reason that is just not clear to me the matrices are wrapped in a list, m = matrix(replicate(4,matrix(1:9,3,3),simplify=FALSE), 2,2) m[1,2][[1]] str(m) and even more surprising to me, m itself has become a list for some reason. baptiste On 8 September 2010 17:22, Alaios ala...@yahoo.com wrote: Hello everyone, Could you please help me find out if R supports matrixes inside matrixes? This is what I would like to do I have an area map of humidity per km. I would like at every cell to keep also information about the height of this area, the current temperature etc. Is something like that supported? I would like to thank you in advance for your help Best Regards Alex [[alternative HTML version deleted]] __ 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. __ 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] Matrixes inside matrixes
To add to Erik's answer: You can use a three dimensional array if all of your data for one cell is the same type -- numeric presumably. If the data were different types (numeric and character, say), you could have a matrix of mode list to do that. However, that's unlikely to be worth the hassle. 'S Poetry' (found on www.burns-stat.com) has a chapter on arrays that might be of interest if you are using 3D arrays. I think all of that chapter should apply to R as well. On 08/09/2010 16:27, Erik Iverson wrote: Hello, from ?array An array in R can have one, two or more dimensions. It is simply a vector which is stored with additional attributes giving the dimensions (attribute ‘dim’) and optionally names for those dimensions (attribute ‘dimnames’). A two-dimensional array is the same thing as a ‘matrix’. So, to answer your question, yes. Alaios wrote: Hello everyone, Could you please help me find out if R supports matrixes inside matrixes? This is what I would like to do I have an area map of humidity per km. I would like at every cell to keep also information about the height of this area, the current temperature etc. Is something like that supported? I would like to thank you in advance for your help Best Regards Alex [[alternative HTML version deleted]] __ 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. __ 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. -- Patrick Burns pbu...@pburns.seanet.com http://www.burns-stat.com (home of 'Some hints for the R beginner' and 'The R Inferno') __ 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.
