read .txt file data with data between specific lines "string" .

I want to read data between ( strings ) line starting from " *Node " and

ending at and next (strings ) line " *Element, type=C3D4" .

Answer 1

[Star Strider]

The textscan function using a numeric format descriptor string will automatically stop when it encounters:

*Element, type=C3D4

so this is actually a straightforward problem:

fidi = fopen('Copy_of_Job-1.txt','rt');
D = textscan(fidi, '%f%f%f%f', 'HeaderLines',9, 'Delimiter',',', 'CollectOutput',1);
fclose(fidi);

with ‘D’ being a (1418x4) double matrix.

[Star Strider]

With only two sections, and changing lines of text and changing format, your file needs specific and different textscan calls for the two sections:

fidi = fopen('Copy_of_Job-1.txt','rt');
D{1} = textscan(fidi, '%f%f%f%f', 'HeaderLines',9, 'Delimiter',',', 'CollectOutput',1);
txtline = fgets(fidi);
D{2} = textscan(fidi, '%f%f%f%f%f', 'Delimiter',',', 'CollectOutput',1);
fclose(fidi);
D1 = cell2mat(D{1});                        % First Section
D2 = cell2mat(D{2});                        % First Section

with ‘D1’ being a (1418 x 4) double, and ‘D2’ being a (6584 x 5) double.

Different files with different requirements would of course require different code.

[jahanzaib ahmad]

thankyou got it .but i want code to find the next string itself and read the data upto next string .

[jahanzaib ahmad]

how can i find the line number with the matching strings ? e.g *nodes and **Element, type=C3D4

[jahanzaib ahmad]

the file format in my case remains constant with same strings .its abaqus .inp file . i want to read the data between strings and modify it .i changed it to .txt .

[Star Strider]

I am not certain what you are asking. I believe the code I posted in my Comment will do what you want.

If your file format remains the same, my code will work with all your files.

[jahanzaib ahmad]

thankyou . i got it .. . ur code works perfectly

[Star Strider]

As always, my pleasure.

I appreciate your compliment.