Give space after 3 digit

I am a new user of Matlab. So, a kind response will be highly appreciated.

All of my experimental data are saved into a txt file. Now, when I load the file, it gives me only one row without any tab or space. I need to separate the integers. A simple space after 3 integer will do the work. But, the file is huge. It's length is 1182239.

i.e: the data: 008112132143... I want: 008 112 132 143...

Answer 1

[Azzi Abdelmalek]

a='123456789'
a=reshape(a,3,[]);
a=[a;blanks(size(a,2))]  
a=a(:)'

%or more general

b='1234567'
n=numel(b)
m=ceil(n/3)*3
a=blanks(m);
a(1:n)=b
a=reshape(a,3,[]);
a=[a;blanks(size(a,2))]  
a=a(:)'

[Saurabh Mahalpure]

How can I do this for big file with bitstream such 1010000010101110001010... upto 5-6lakh binary numbers stream

Answer 2

[Matt J]

See DLMWRITE and DLMREAD

Answer 3

[Walter Roberson]

Read in the row as a string, say S.

If you want the result as strings, then

reshape(S, 3, []).'

would give one group of three per row.

If you want the result as integers converted from the strings, then

(S(1:3:end)-'0') * 100 + (S(2:3:end)-'0') * 10 + (S(3:3:end)-'0')

will give you a row vector of integral values.