MATLAB: How can i read 14,000 data points from a file

datapoints

i read the datapoints by using importdata… but this is not suited for large number of data points….i have to design a notch filter with this data….so i have to read 14000 data points from a file…. what i have to do??

Best Answer

fid = fopen('YourFile.txt');
datacell = textscan(fid, '%f%f', 14000, 'CollectOutput', 1);
fclose(fid);
youdata = datacell{1};

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MATLAB: I want to delete all the headerlines and delimiters from the data in the below attached text file

The best solution is probably to read your entire file as text, then remove the header lines, then parse them with textscan.

MATLAB: How to read a text file and import a part of it into matlab.

fmt=[repmat('%f',1,8) %*[^\n]'];  % 8 values, skip rest of line format string
fid=fopen('yourfilenamehere');    % open the file; return file handle
data=cell2mat(textscan(fid,fmt,38,'collectoutput',1)); % read; repeat format 38 times
fid=fclose(fid);                  % close file
% do whatever w/ data here...

NB: I went ahead and wrapped the textscan call in cell2mat to return a double array. I assumed delimiter one of the default; if something else you'll need to fixup to match.

See

doc textscan % for details, examples, etc., ...

Or, option B:

Use the data import tool from the User Interface that (I think) will let you select an area to import from the file...not sure how it will do with such a long file but presume it'll handle it.

Best Answer

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MATLAB: How to read a text file and import a part of it into matlab.

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