Read data from file

4 views (last 30 days)
Nidhi SRIVASTAVA
Nidhi SRIVASTAVA on 3 Jul 2017
Edited: per isakson on 3 Jul 2017
I have a huge file with data format:
(2,4) (5,6)
(34,26) (22,78)
(18,76) (33,50) etc.
I want to create 4 matrix with data as(2,34,18) ; (4,26,76); (5,22,33) and (6,78,50). I used textscan to read the data but couldn't use it aptly. If anybody could guide me with it, it will be very helpful.
  2 Comments
Image Analyst
Image Analyst on 3 Jul 2017
Make it easy for people to help you by attaching the file. We don't need all 42 terabytes of it, just a few lines.

Sign in to comment.

Accepted Answer

per isakson
per isakson on 3 Jul 2017
Edited: per isakson on 3 Jul 2017
Two variants
fid = fopen( 'cssm.txt' );
cac = textscan( fid, '(%d,%d) (%d,%d)', 'Whitespace','' ...
, 'Delimiter',' ', 'CollectOutput',true );
fclose( fid );
num1 = cac{1};
fid = fopen( 'cssm.txt' );
cac = textscan( fid, '%d%d%d%d', 'MultipleDelimsAsOne',true ...
, 'Delimiter','(),', 'CollectOutput',true );
fclose( fid );
num2 = cac{1};
m1 = permute( num2(:,1), [2,1] );
m2 = permute( num2(:,2), [2,1] );
m3 = permute( num2(:,3), [2,1] );
m4 = permute( num2(:,4), [2,1] );
Inspect the result
>> all(all(num1==num2))
ans =
1
>> num2
num2 =
2 4 5 6
34 26 22 78
18 76 33 50
>>
Do you really want m1,m2,m3 and m4?

More Answers (0)

Categories

Find more on Large Files and Big Data in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!