On Mar 13, 2011, at 6:42 PM, Eduardo M. A. M.Mendes wrote:
Hi Joshua
Many thanks.
The values of flow can be accessed in a weird way and we can used
them for some calculations. Since I am a newbie as far as using R
is concerned I wonder whether you could tell me how to create a
structure in R that looks like the one I have in matlab (that is, a
variable a that contains river1 and river2 that contains flow and
precipitation).
If you posted the results of dput(a) , we might be able to test our
pet theories, but here is my hapless first guess:
mat.R.struc <- with(b$a[,,1], #looks like it was a matrix that had
lists as elements
cbind(as.data.frame(river1), as.data.frame(river2) )
)
It's not so much that it will "look like" your Matlab structure, but
it could be something that you can work with. This will create a long-
format structure which is a typical one for plotting ans regression.
Another option would be an R array which, unlike matrices, can have
more than 2 dimensions.
Cheers
Ed
-----Original Message-----
From: Joshua Wiley [mailto:jwiley.ps...@gmail.com]
Sent: Sunday, March 13, 2011 7:20 PM
To: Eduardo M. A. M.Mendes
Cc: R-help@r-project.org
Subject: Re: [R] readMat - how to retrieve the variables
On Sun, Mar 13, 2011 at 2:56 PM, Eduardo M. A. M.Mendes <emammen...@gmail.com
> wrote:
Hi Joshua
Many thanks for the prompt reply.
I have saved a short version of the matlab file and the output on R
is
b=readMat("testr.mat")
b
$a
, , 1
[,1]
river1 List,2
river2 List,2
It looks like you are dealing with a special series of lists nested
within three dimensional arrays within lists. My suggestion would
be to double check that the matlab file has reasonable data
(whatever that means) and try to double check your use of readmat
(do you meet all the requirements for versions, etc.). That is not
a common R structure so the extraction is similarly uncommon.
Perhaps Henrik will be along with more helpful answers.
Good luck,
Josh
attr(,"header")
attr(,"header")$description
[1] "MATLAB 5.0 MAT-file, Platform: PCWIN, Created on: Sun Mar 13
18:51:54 2011 "
attr(,"header")$version
[1] "5"
attr(,"header")$endian
[1] "little"
When I issue the command b$a[,,1]$river1[,,1]$flow I see the flow
values.
Unfortunately the data is confidential.
Many thanks
Ed
-----Original Message-----
From: Joshua Wiley [mailto:jwiley.ps...@gmail.com]
Sent: Sunday, March 13, 2011 6:30 PM
To: Eduardo M. A. M.Mendes
Cc: R-help@r-project.org
Subject: Re: [R] readMat - how to retrieve the variables
Hi Ed,
Can you please provide *at least* the R output from running:
str(data)
where "data" is the variable name you stored the results of
readMat() in. If it is reasonably small and can be sent as
plaintext (I do not know Matlabs file format off hand), you could
send us the actual data so we can try to read it in, but at the
least str() will let us see how R is storing your data and give you
some explanation.
Side note, as data() is a function, it might be worthwhile to call
your actual data something else (say, mydata, dat, etc.). For
anyone else interested, readMat() is in package "R.matlab".
Cheers,
Josh
On Sun, Mar 13, 2011 at 2:07 PM, Eduardo M. A. M.Mendes <emammen...@gmail.com
> wrote:
Hello
I have a matlab MAT file that contains one single variable: a. The
structure of a is as follows:
a.river1.flow (flow values)
a.river1.date_flow (date)
a.river1.precip (precipitation values) a.river1.date_precip
a.river2.flow a.river2.date_flow a.river2.precip
a.river2.date_precip
I have used readMat to load the variable a in R, however I have no
idea how readMat translates a. I managed to get some values out of
data=readMat("matfile.mat")
data$a[,,1]$river1[,,1]$flow -> Why do I need [,,1]? Why not
data$a$river1$flow?
Many thanks
Ed
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--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.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.
David Winsemius, MD
West Hartford, CT
______________________________________________
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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.
