How to skip first three lines in Matlab and read the next line until fixed character appears?
50 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
KOU DU
am 27 Mär. 2019
Kommentiert: KOU DU
am 7 Okt. 2019
I have a input txt file as shown below:
*Heading
U:/Mesh_Sphere_faible.inp
*Node
1, 0.061725, 0.271605, 0.41523577
2, 0.05795391, 0.39902727, 0.29566634
3, 0.012345, 0.054321, 0.083047155
*Element, type=C3D10, ELSET=PART1
1, 150, 1278, 1280, 1282, 3738, 3742, 3740,
3739, 3741, 3743
2, 62, 700, 702, 704, 2342, 3747, 3745,
3744, 3746, 3748
3, 242, 1863, 1866, 1865, 3749, 3753, 3751,
3750, 3752, 3754
I want to read the data after line of '*Node'. I have tried
A=dlmread('Mesh_Sphere_faible.dat','',4,0)
but always stopped at line:
2, 0.05795391, 0.39902727, 0.29566634
How can I realise it?
And I also want to read until line
*Element, type=C3D10, ELSET=PART1
appears.
What can I do?
2 Kommentare
Walter Roberson
am 28 Mär. 2019
Bearbeitet: Walter Roberson
am 28 Mär. 2019
Could you confirm that the lines alternate between 8 comma separated values (with trailing comma on the line) followed by 3 comma separated values?
Or is that just a result of how it was posted, and all of those values are on the same line?
Can you attach a sample file for certainty ?
Akzeptierte Antwort
Image Analyst
am 29 Mär. 2019
This will do it:
% Open the file.
fullFileName = fullfile(pwd, 'example.txt')
fileID = fopen(fullFileName, 'rt');
% Read the first 3 lines of the file.
textLine = fgetl(fileID); % Read and throw away line 1
textLine = fgetl(fileID); % Read and throw away line 2
textLine = fgetl(fileID); % Read and throw away line 3
data = [];
while ischar(textLine)
% Read the next line.
textLine = fgetl(fileID);
% Print out what line we're operating on.
fprintf('%s\n', textLine);
if ~contains(textLine, 'Element')
numbers = sscanf(textLine, '%f,')
data = [data; numbers'];
else
break;
end
end
% All done reading all lines, so close the file.
fclose(fileID);
% Show in command window.
data
Weitere Antworten (2)
Niti K
am 27 Mär. 2019
you can use the function fgetl. you can open the file in read mode using fopen and set up a while loop with the file id.
sort of a pseudocode
1) open the file using fopen
2) utilizing a loop, use getl which will fetch all the characters in the current line. Each usasge of getl will fetch the next line in your file
3) string split the output from getl using space delimeter
4) use string compare to check whether first worf from string split matches your criteria (*node in this case)
5) you can then read the data you want untill you encounter (*element)
exit out of the loop
Akira Agata
am 29 Mär. 2019
Another possible solution:
% Read the file as a text
fid = fopen('Example.txt','r');
C = textscan(fid,'%s','Delimiter','\n');
C = C{1};
fclose(fid);
% Find row numbers which contains the words 'Node' and 'Element'
row1 = find(contains(C,'Node'));
row2 = find(contains(C,'Element'));
% Extract data rows
C = C(row1+1:row2-1);
% Convert to numeric matrix
D = cellfun(@(x) str2double(strsplit(x,',')),C,'UniformOutput',false);
D = cell2mat(D);
Siehe auch
Kategorien
Mehr zu Entering Commands finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!