search number in a text file

Hello

i am new in matlab and i want to know how to search numbers in a

text file for example:

the content of the text file is:

abc

afsa

fas54fg

dsa

the program suppose to return false because there is number ("54") in line 3

Thanks

Answer 1

[Walter Roberson]

Use textscan(). Set the Whitespace characters to include everything except the digits. If textscan() returns a non-empty input then the file contained at least one number.

[Ben Gedi]

what should i change here?

strc = textscan(fopen('yourtxt.txt'),'%c');

s1 = regexp(strc{:}', '[0-9]*','match');

yournumber = str2double(s1);

[Walter Roberson]

WS=[1:47 58:91 93:255 '\\'];

fid = fopen('yourtxt.txt');

strc = textscan(fid, '%d', 'Whitespace', WS);

fclose(fid);

has_no_numbers = isempty(strc{1});

Warning: do not include 0 in your WS, as MATLAB will ignore the list of characters if you do. And you have to take special care about the \ character as MATLAB tries to examine it as a backspace constant such as \n or \t

Answer 2

[Andrei Bobrov]

variant

Your text in the file 'yourtxt.txt'

strc = textscan(fopen('yourtxt.txt'),'%c');
s1 = regexp(strc{:}', '[0-9]*','match');
yournumber = str2double(s1);

variant 2

strc = textscan(fopen('yourtxt.txt'),'%c');
s1 = regexp(strc{:}', '[0-9]*');
no_numbers = isempty(s1);

[Ben Gedi]

Hi Andrei thanks for the answer

but i just need to return true or false if there is numbers in the given file... and i need to do it with a loop...

Thank you very much for your help!!

[Oleg Komarov]

Why a for loop?

[Ben Gedi]

i know that is not necessary but this the way i need it to be,

but still if you have other solution i will be happy to see it to

thanks

Ben