MATLAB: Reading a number from text file

fscanfnastrantext filetextscan

I am trying to read a value from a f06 file which is a general text file contains numbers, strings.I have added the text file and underlined the value that ı want to read.Can anyone help with this? Below you can find my code but it doesnt work.

clc;

clear all;

fid = fopen('composite_lamina-density.f06','r');

frmat='MASS AXIS SYSTEM \n %s %d %f %f %f';

C = fscanf(fid,frmat);

fclose(fid);

Best Answer

>> str = fileread('MASS.txt');
>> tmp = regexp(str,'(?<=X\s+)\d+\.?\d*E[-+]\d+','match','once');
>> str2double(tmp)
ans =  3.959280000000000

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You cannot insert characters in a text file. Trying this will overwrite the existing characters. Therefore you have to read the complete file at first, add the string in the memory and write the complete file afterwards:

Str = fileread('test.txt');
fid = fopen('text.txt', 'w');
if fid == -1
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fprintf(fid,'%s\n','abc');
fprintf(fid, '%s', Str);  % Or faster: fwrite(fid, Str, 'char');
fclose(fid);

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Use fopen, fgetl, fclose to read your file into a cell array and discard the lines you don't want. Or if you want to write a new file, use fopen, fprintf, fclose and write as your read:

fidi = fopen('somefile.txt', 'rt');
fido = fopen('newfile.txt', 'wt');
tline = fgetl(fidi);
while ischar(tline)
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    fprintf(fido, '%s\n', tline);
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end
fclose(fidi);
fclose(fido);

edit: forgot to read the next line!

Best Answer

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