CODEWITHSUNDEEP
matlab
user3428030
user3428030

Reputation: 11

How do you create a 2X5 matrix from a text file in matlab

I am trying to obtain a 5X2 matrixfrom a text file.

For Example :

0_0     1_0
0_200   1_200
0_400   1_400
0_600   1_600
0_800   1_800

This is the code I am currently using:

[filename,pathname]= uigetfile({'*.txt'});
set(handles.temp1,'String',fullfile(pathname,filename));
chosenfile=get(handles.temp1,'String');

fid=fopen(chosenfile);

allcoordinates=textscan(fid,'%s,%s','whitespace','\n');    
fclose(fid);

This code would produce a 5X1 matrix as shown below :

 0_01_0
 0_2001_200
 0_4001_400
 0_6001_600
 0_8001_800

Upvotes: 0

Views: 172

Answers (1)

Rody Oldenhuis
Rody Oldenhuis

Reputation: 38032

Sadly, the approach that works best with interpretation of files, is to be very conservative with relying on the capabilities of 'canned routines' like textscan, dlmread and similar.

This is not because these routines are implemented badly, it's because there is very little standardization in number formatting in text files, and basically, everybody just invents a new standard on the spot.

You just can't design a routine that always works correctly for all text files. I think The Mathworks did a very decent job with their dlmread and similar, however, you have just presented yet another standard in number formatting that is overly difficult to interpret in one go with textscan or dlmread or others. Therefore, be conservative: just read it without too much hassle, and do the conversion yourself.

For example: 

%// Read data
fid = fopen('yourFile.txt', 'r');
    C = textscan(fid, '%s %s');
fclose(fid);

%// Replace all underscores with '.', and convert to 'double'    
C = str2double(strrep([C{:}],'_','.'))

Results: 

C =
         0    1.0000
    0.2000    1.2000
    0.4000    1.4000
    0.6000    1.6000
    0.8000    1.8000

Upvotes: 3

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