Can MATLAB read 'R' data files (*.Rda) directly?

2014 9 16
2 个回答
更新时间：2023 6 9
19 次查看（30 天）

回答（2 个）

Peter
Peter 2023-6-9

1 个投票

If you have Python installed on your system, you can use use the Matlab python call functionality to read in such R files.
Firstly, ensure that you have installed the Python package pyreadr onto your system; this package reads/writes R RData and Rds files into/from pandas data frames, and does not require R to have been installed, not any other external dependencies installed.
Then you can load in matlab via the command:
dict = py.pyreadr.read_r(<path to rda file>);
As it stands the variable "dict" will be a Python OrderedDict, so to use data it contains you need to create a matlab array as follows:
result=double(dict{<key>}.values);
where <key> is the string defining which key of the pandas frame dict you wish to extract.
If in doubt, check which keys the imported panda frame has by running the command:
dict.keys()
Once you have found the key of interest, you may further check the complete properties of the data stored under this key by running the command:
dict{<key>}
Pierre Benoit
Pierre Benoit 2014-9-17
编辑：Pierre Benoit 2014-9-17

0 个投票

Apparently no, see Supported File Formats for Import and Export.
The only other topic I found about this was this.

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Richard
Richard 2014-9-17
Thanks, Pierre. I ended up reading them in to 'R', then saving as a CSV which imports easily into MATLAB. Since I am new to 'R', it took me some time to generate the appropriate code. Here is an example:
> load(“kidneydata.Rda”) % from Brad Efron's web site
> dim(kidneydata) % returns 157 x 2
> A <- t(kidneydata) % transpose array
> dim(A) % returns 2 x 157
> write(A,"kidneydata.csv",ncolumns = 2,sep = ",") % save as CSV file
> write(A,"kidneydata.csv",ncolumns = 2,sep = "\t") % to save as TSV file
Andrew
Andrew 2020-9-22
Now in 2020 with R studio 1.1.456, the 'write' function croaked with a mysterious "Error in cat...argument 1 (type 'list') cannot be handled by cat" error, but:
write.csv(variable,"filename");
worked just fine.

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Richard
Richard
2014-9-16

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Peter
Peter
2023-6-9

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