how to extract this data?
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Star Strider
2016-2-4
One option:
fidi = fopen('your_text_file_name.txt','r');
Data = textscan(fidi, '%f%f%f', 'HeaderLines',4, 'CollectOutput',1);
fclose(fidi);
You might have to add an 'EndOfLine' argument if you only get a (1x1) cell from the previous code:
fidi = fopen('your_text_file_name.txt','r');
Data = textscan(fidi, '%f%f%f', 'HeaderLines',4, 'CollectOutput',1, 'EndOfLine','\r\n');
fclose(fidi);
You can then parse the columns as you wish. Use a cell array. Find the zeros in the first column using the find function:
DataD = cell2mat(Data);
Zeros1 = [find(DataD(:,1) == 0); size(DataD,1)];
for k1 = 1:length(Zeros1)
Record{k1} = DataD(Zeros1(k1):Zeros1(k1+1)-1,:);
end
Note — This is UNTESTED CODE, since I do not have your file to test it with.
10 个评论
Pengju
2016-2-4
Star Strider
2016-2-4
My pleasure.
The loop should be:
for k1 = 1:length(Zeros1)-1
Record{k1} = DataD(Zeros1(k1):Zeros1(k1+1)-1,:);
end
Error on my part. This new version should work.
Pengju
2016-2-4
编辑：Star Strider
2016-2-4
Thanks a lot,
I may give you the data file. I want put all the data in the red squares in one array...
Pengju
2016-2-4
Pengju
2016-2-4
Star Strider
2016-2-4
This code works correctly with your file:
fidi = fopen('test.txt','r');
Data = textscan(fidi, '%f%f%f', 'HeaderLines',4, 'CollectOutput',1);
fclose(fidi);
DataD = cell2mat(Data);
Zeros1 = unique([find(DataD(:,1) == 0); size(DataD,1)]);
for k1 = 1:length(Zeros1)-1
Record{k1} = DataD(Zeros1(k1):Zeros1(k1+1),:);
end
Output = [Record{1}(2:end-1,3); Record{2}(2:end-1,3); Record{3}(2:end-1,3)];
I had to work to edit your post so I could see your image, but I managed to do it.
The ‘Output’ array has the data in the red squares.
Pengju
2016-2-4
Star Strider
2016-2-4
I only have the data you provided, and I have demonstrated how to read your file and extract the data you want.
I leave it to you to do the rest.
Pengju
2016-2-4
Star Strider
2016-2-4
My pleasure.
If my Answer solved your problem as you stated it in your Question, please Accept it.
更多回答（1 个）
dpb
2016-2-4
As noted above, w/o a file to test, something like
fid=fopen('yourfile'); % open file
d=cell2mat(textscanf(fid,'','headerlines',4)); % read numeric data (Nx3 array)
fid=fclose(fid); % done w/ file
ix=[find(d(:,1)==0);length(d)+1]; % locations of segment breaks in data plus end
for i=1:length(ix)-1 % over the number of breaks
data{i}=d(ix(i):ix(i+1)),3); % save each group as a cell array
end
Do whatever with the contents of data for each cell as desired.
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