How can I read a specified, comma seperated text (txt) file line-byline?

Question

Kalen Timbs 2016-5-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/284916-how-can-i-read-a-specified-comma-seperated-text-txt-file-line-byline

回答： JohnGalt 2016-5-19

I need to just read the 3 following numerical value from a text file using sscanf line by line:

3616813421 V,0 counts,500 ms
3567937374 V,0 counts,500 ms
3616813421 V,0 counts,500 ms
3616813421 V,0 counts,500 ms
3665689229 V,0 counts,500 ms
.

So far i have:

fileID=fopen('data.txt','rt');
line=fgetl(fileID);
a = fscanf('line','%s %s %s');

But this doesnt seem to work and im unsure as what to do.

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Answer 1

JohnGalt 2016-5-19

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https://ww2.mathworks.cn/matlabcentral/answers/284916-how-can-i-read-a-specified-comma-seperated-text-txt-file-line-byline#answer_222705

在 MATLAB Online 中打开

Now, you say that you'd like the 3 numerical values which can be obtained by:

fileID=fopen('data.txt','r');  % I've removed the 't'  
  while feof(fileID)~=1
  line=fgetl(fileID);            % as per OP
  a = cell2mat((textscan(line,'%f V,%f counts,%f ms'))); % a is a 3x1 matrix
  display(a)
  % do something with 'a'
  end
  fclose(fileID);

However, if you wanted to read the file in one go... you could use:

fileID=fopen('data.txt','r');  % I've removed the 't'
  a = cell2mat(textscan(fileID,'%f V,%f counts,%f ms'));
  fclose(fileID);
  display(a)

There are further improvements that can be made to this code (checking that the file opens correctly, using more appropriate data types etc etc) but this should achieve what you intend.