问题
I'm sure this is a simple problem, but I haven't been able to find an obvious solution. I have a series of model output array files (dim 180, 360, 12) generated in matlab that I need to open in R.
I have attempted to use the R.matlab package, simply using the readMat command, and this results in a list object. Attempting to write this list into a matrix results in a memory allocation error.
I have tried unlisting, but that did not help either.
How can I open these matlab matrix files and write as a matrix in R? Any thoughts?
code for the matlab read so far is simply:
> data<-readMat("filename")
> typeof(data)
[1] "list"
> str(data)
List of 1
$ pco2: num [1:180, 1:360, 1:12] NaN NaN NaN NaN NaN ...
- attr(*, "header")=List of 3
..$ description: chr "MATLAB 5.0 MAT-file, Platform: GLNXA64, Created on: Thu Jul 26 10:36:42 2012 "
..$ version : chr "5"
..$ endian : chr "little
回答1:
Please double check your file inside MATLAB, and make sure not all values are NaN. Simply load the file in MATLAB and inspect the contents:
load file.mat
Here is a simple test I just did:
MATLAB
>> x = rand(3,4,2)
x(:,:,1) =
0.75127 0.69908 0.54722 0.25751
0.2551 0.8909 0.13862 0.84072
0.50596 0.95929 0.14929 0.25428
x(:,:,2) =
0.81428 0.34998 0.61604 0.83083
0.24352 0.1966 0.47329 0.58526
0.92926 0.25108 0.35166 0.54972
>> save file.mat x
R
R> library(R.matlab)
R> data <- readMat('file.mat')
R> str(data)
List of 1
$ x: num [1:3, 1:4, 1:2] 0.751 0.255 0.506 0.699 0.891 ...
- attr(*, "header")=List of 3
..$ description: chr "MATLAB 5.0 MAT-file, Platform: PCWIN, Created on: ..."
..$ version : chr "5"
..$ endian : chr "little"
R> data$x
, , 1
[,1] [,2] [,3] [,4]
[1,] 0.7513 0.6991 0.5472 0.2575
[2,] 0.2551 0.8909 0.1386 0.8407
[3,] 0.5060 0.9593 0.1493 0.2543
, , 2
[,1] [,2] [,3] [,4]
[1,] 0.8143 0.3500 0.6160 0.8308
[2,] 0.2435 0.1966 0.4733 0.5853
[3,] 0.9293 0.2511 0.3517 0.5497
来源：https://stackoverflow.com/questions/11671883/importing-an-array-from-matlab-into-r