How to read file '100.dat' and '100.atr' of MIT BIH DATABASE (PHYSIONET)?

Question

Vinícius 2013-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/83546-how-to-read-file-100-dat-and-100-atr-of-mit-bih-database-physionet

评论： Walter Roberson 2023-1-13

Hi peoples,

I would like of know how do for read the files DATABASE (MIT BIH DATABASE). The own provides an script for read, but gives error. The script is: rddata.m site: http://www.physionet.org/physiotools/matlab/rddata.m. Could anyone help me?

Thanks

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Reid Kostenuk 2016-11-11

I had the same problem. You have to precisely specify the file path. You can read about specifying file paths here... https://www.mathworks.com/help/matlab/matlab_env/specify-file-names.html

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Answer 1

per isakson 2013-7-30

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编辑：per isakson 2013-7-30

在 MATLAB Online 中打开

Your question ought to include

a link to the data
details on the error

However, I downloaded the data (100.dat,100.atr,100.hea) and changed the line

PATH= 'M:\Profile\Desktop2k\MIT_CD\mitdb';

to match my download-folder. The program then worked nicely and produced a diagram.

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Explorer 2015-4-27

You did not get my question. Anyway, I find the way to read downloaded database here

Susan 2022-8-8

编辑：Susan 2022-8-8

在 MATLAB Online 中打开

@per isakson Could you please tell me in what function you set the PATH to the folder that contains the data (100.dat,100.atr,100.hea) ? By changing the path, do you mean changing

WFDB_PATH = []

in "wfdbloadlib.m" line 50 to

WFDB_PATH='M:\Profile\Desktop2k\MIT_CD\mitdb'

in your case?

I downloaded the data I want to read and exceuted the rdann.m file, However, I got the following error

Index exceeds Java array dimensions
Error in rdann (line 188)
    str=char(data(1));

Any help would be greatly appreciated. Thanks in advance!

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Answer 2

Martin Paralic 2019-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/83546-how-to-read-file-100-dat-and-100-atr-of-mit-bih-database-physionet#answer_357969

编辑：Martin Paralic 2019-1-25

% use WFDB Toolbox for MATLAB and Octave from

% https://www.physionet.org/physiotools/matlab/wfdb-app-matlab/

% First, ADD PATH in Matlab enviroment where your data are stored (100.dat, 100.hea, 100.atr)

% use function rdsamp() to read samples

% [signal,Fs,tm]=rdsamp(recordName,signaList,N,N0,rawUnits,highResolution)

[signal, fs, tm] = rdsamp('100');

% to read annotation use function rdann()

% [ann,anntype,subtype,chan,num,comments]=rdann(recordName, annotator, C, N, N0, AT)

[ann, anntype, subtype, chan, num, comments] = rdann('100','atr');

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Walter Roberson 2023-1-13

That WFDB location appears to now redirect to

https://www.physionet.org/content/wfdb-matlab/0.10.0/

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Answer 3

Vinícius 2013-7-30

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Hi, the error that has been:

\n$> WORKING ON 100.hea ... ??? Error using ==> fgetl at 44 Invalid file identifier. Use fopen to generate a valid file identifier.

Error in ==> rddata at 38 z= fgetl(fid1);

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Matt Kindig 2013-7-31

在 MATLAB Online 中打开

Based on the error message, it sounds like fopen() failed. Are you sure that you're passing in the correct filename to fopen().

Try this:

dbstop if error %turn on breakpoints at error

and now run your code. What is the value of the filename variable passed into the fopen() statement? Is this a valid file? Remember, if the file is not local to your working directory or is not on your path, you need to include the full (absolute) path for the file.

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