How I can read chb01_03.edf.seizures file from CHB MIT database in MATLAB? As I am using this file for seizure detection required in my reasearch, Plz provide function to read this file.

When I use edfread to read chb01_03.edf.seizures giving error!!!

Subscript indices must either be real positive integers or logicals.

Error in edfread1 (line 141)
hdr.label{ii} = regexprep(fread(fid,16,'*char')','\W','');

Error in Data_read_29_6_15_Seiz (line 3)
[a11,b11]=edfread1('chb01_03.edf.seizures');

Answer 1

[Alex]

I used this code that I got from comparing bytes in .edf.seizure files to the summary of the data in the folder:

function [ seizure_start_time_offset_in_seconds, seizure_length_in_seconds ] = get_seizure_period( annotation_file_location )

      file_descriptor = fopen(annotation_file_location);

      byte_array = fread(file_descriptor);

      seizure_start_time_offset_in_seconds = bin2dec(strcat(dec2bin(byte_array(39)),dec2bin(byte_array(42))));

      seizure_length_in_seconds = byte_array(50);

end

[Walter Roberson]

I am not sure if that is a question?

[Lynn Houthuys]

This works fine as long as there are no 2 or more seizures in the file... does anyone have a solution for this case?

[PHUONG DAO]

Dear Alex and Walter, would you please provide me with the format of .edf.seizures file?

[Walter Roberson]

I was not able to find information about the structure of the file.

[Naznin Sultana]

I have the similar problem. I can not read .seizure file from CBH_MIT database. What does this function

function [ seizure_start_time_offset_in_seconds, seizure_length_in_seconds ] = get_seizure_period( annotation_file_location )

do? How can i get seizure data and plot it?

[Emanuele Aimi]

hi, did you manage to find a solution?

Answer 2

[Walter Roberson]

I do not see edfread1() anywhere. Have you tried edfread2() or readEDF()

[Varsha Harpale]

With edfread2() I am getting error!!!

[c1,b2]=edfread2('chb01_01.edf'); Warning: EDFREAD: More than one sample per record, might take a while > In edfread2 at 169 Error using + Matrix dimensions must agree.

Error in edfread2 (line 192) writeIndices{chans} = writeIndices{chans} + hdr.samples;

[Varsha Harpale]

Thank you Walter

But with edfread1() at least I can read chb01.edf but having problem in reading chb01.edf.seizures file.

[Varsha Harpale]

With ReadEDF I can read normal chb01.edf but for chb01.edf.seizures having error!!!!!

[c1,b2]= ReadEDF('chb01_03.edf.seizures'); Index exceeds matrix dimensions.

Error in ReadEDF (line 17) header.patientID = char(hdr(9:88)); % 80 ascii : local patient identification

[Walter Roberson]

My guess would be that chb01.edf.seizures is not an edf file, and is instead a file that contains a list of edf files.

Answer 3

[Itaf BEN SLIMEN]

i have the same problem oen between you can open thhis file .edf.seizures

[Walter Roberson]

You did not attach a file?

You might need to zip the file to attach the zip