Hi,
I would like to read from line 85 to line 1108 in txt file in matlab.
I don't know how to do it.
The data from line 85 to line 1108 looks like this:
I have 1024 data.
Can please anybody help me?
Thanks,
Hung Jr
MATLAB: How to read data from certain range in txt file in matlab
txt
Related Solutions
filename = 'File.txt';fid = fopen(filename, 'rt');GAL = cell2mat(textscan(fid, '%*s%f%f%f', 1, 'headerlines', 2, 'collectoutput', true));fclose(fid);Maybe not the most rubust way, but it does the job. (The numerical blocks must be followed by non-numerical text.)
%%
ffs = '1D_spectrum_1.txt'; fid = fopen( ffs, 'r' );ca0 = textscan( fid, '%f%f', 'HeaderLines', 5, 'CollectOutput',true );ca1 = textscan( fid, '%f', 'HeaderLines', 2, 'CollectOutput',true );ca2 = textscan( fid, '%f%f%f', 'HeaderLines',12, 'CollectOutput',true );ca3 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );ca4 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );ca5 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );ca6 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );ca7 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );ca8 = textscan( fid, '%f%f%f', 'HeaderLines', 1, 'CollectOutput',true );[~] = fclose( fid );and inspect
>> ca0{:}ans = -2.3243 50.62 -2.3147 50.609 -2.3041 50.614 ...>> ca1{:}ans = 0.05 0.0551 0.0607 0.0668 ...>> ca2{:}ans = 0.0005568 86.6 16.7 0.15 78.1 10.8 1.07 78 10.7 3.711 77.9 10.7 ... In response to the first comment
Caveat: It's risky to, based on one sample file, write functions that reads mixed text files. The format of next file may be slightly different and the function fails. In the current case, may I trust that there is a letter after the single numeric field in line 5?
The documentation of textscan() is large and it takes some time to understand all its features.
Doc says:
- "[...] The textscan function reapplies formatSpec throughout the entire file and stops [terminates] when it cannot match formatSpec to the data."
- "[...] If you resume a text scan of a file by calling textscan with the same file identifier (fileID), then textscan automatically resumes reading at the point where it terminated the last read."
- "[...] textscan skips the header lines, including the remainder of the current line."
Thus the statement
caX = textscan( fid, '%f', 'HeaderLines',4, 'CollectOutput',true ); skips 4 header lines, reads numerical fields and terminates when it encounters an item that '%f' doesn't match. The following statement
ca0 = textscan( fid, '%f%f', 'HeaderLines',1, 'CollectOutput',true );skips the remainder of the current line, i.e the text "number of locations", reads any number of pairs of numerical fields and terminates when it encounters a non-numerical field.
To "import the number on line 5", replace the statement
ca0 = textscan( fid, '%f%f', 'HeaderLines', 5, 'CollectOutput',true );by the two statements
caX = textscan( fid, '%f', 'HeaderLines', 4, 'CollectOutput',true );ca0 = textscan( fid, '%f%f', 'HeaderLines', 1, 'CollectOutput',true );It works
>> caX{:}ans = 6>> ca0{:}ans = -2.3243 50.62 -2.3147 50.609 -2.3041 50.614
Best Answer