problem with loading data
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Hi!
I've got a problem with loading data (.dat files) to Matlab. I've got a file with data from rheography and ecg, but it's got specific format:
- first 4 Byte: 00 serial number X Zo
- 4092 Byte: data from calibration rheo and ecg (i need to load every fourth Byte, because I only need the ecg data)
- 4 Byte: 00 serial number X Zo
- 4092 Byte: every second Byte is ecg which is what i need to load
I've been trying to load it but all I've got is this:
"??? Error using ==> load
Number of columns on line 1 of ASCII file
C:\Users\Owu\Documents\MATLAB\program\Arek.dat
must be the same as previous lines."
Could anybody help me to find the solution how to separate ecg data from the file? I need to load it into my programe.
I'll be very geateful for your help.
1 Comment
Jan
on 20 Nov 2011
@Olga: The format of the file is not clear. Please edit your question. I assume, you have to insert an empty line before the list.
Accepted Answer
Jan
on 20 Nov 2011
You cannot use load to read a binary file. FREAD is more likely to be helpful:
[EDITED]: CODE EXPANDED
FID = fopen(FileName, 'r');
if FID == -1, error('Cannot open file'); end
fread(FID, 4, 'uint8');
Data = fread(FID, [1, 4092], 'uint8');
Calib = Data(4:4:end);
fread(FID, 4, 'uint8');
Data = fread(FID, [1, 4092], 'uint8');
Value = Data(2:2:end);
I do not know, what "4B:" exactly means. But "help fread" shows all needed information to read a binary file.
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More Answers (1)
Olga
on 20 Nov 2011
4 Comments
Image Analyst
on 20 Nov 2011
By the way, is it every 4th byte like you said first, or is it every 2nd byte like you just said now? Either way, you change the middle value in startingIndex:4:end to be either 2 or 4 once you figure out which way it really is. By the way, are you sure the binary data is 8 bit byte data and not floating point single or double precision data? Because if it is, there would be a different args to fread().
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