How do I read a file with complex data (real + imaginary) into a vector?

I have a file with 100 rows of complex data with variable column size. How do I read it into a vector of 70: [] ?

If row 1 is bigger than row 2, then I like the row 1 padded by default (like in dlmread).

[per isakson]

data.txt contains one huge row of tab-delimited complex data. Is that what you intended?

[Irfan Mohideen]

It should look like this.

1.868-0.52591i	-0.4178+1.0316i	0.5408-0.74036i	-0.024144+1.6425i	-0.34343+0.96012i	
0.33257-0.20658i	-0.56193-1.6297i	-0.3833+0.555i	0.58934-0.053148i	0.18756-0.53192i	-1.0676+0.88013i
0.6894+0.60439i	1.2882+0.12116i	1.0911+0.40315i	-0.63711-0.91396i	-0.70589+0.54294i	-0.28131+0.41173i
0.36288+1.0868i	-0.7524+0.72005i	-1.8897+0.25002i	1.3212+1.9887i	

[Irfan Mohideen]

I have put the data on github, please have a look. Thanks.Data

[per isakson]

github says: This repository is empty.

Answer 1

[per isakson]

What problem do you encounter? With R2018b dlmread() reads your small data set nicely. Padding is done with 0+0i

>> C = dlmread( 'data.txt' )
C =
  Columns 1 through 3
        1.868 -    0.52591i      -0.4178 +     1.0316i       0.5408 -    0.74036i
      0.33257 -    0.20658i     -0.56193 -     1.6297i      -0.3833 +      0.555i
       0.6894 +    0.60439i       1.2882 +    0.12116i       1.0911 +    0.40315i
      0.36288 +     1.0868i      -0.7524 +    0.72005i      -1.8897 +    0.25002i
  Columns 4 through 6
    -0.024144 +     1.6425i     -0.34343 +    0.96012i            0 +          0i
      0.58934 -   0.053148i      0.18756 -    0.53192i      -1.0676 +    0.88013i
     -0.63711 -    0.91396i     -0.70589 +    0.54294i     -0.28131 +    0.41173i
       1.3212 +     1.9887i            0 +          0i            0 +          0i
>> 

where data.txt contains the data of your comment,

"a vector of 70: [] ?"

D = reshape( C, 6,[] );  % I replaced 70 by 6 to match this small data set

"If row 1 is bigger than row 2, then I like the row 1 padded"

You don't mean to pad the "bigger" row?

In response to comments

This script does for the large file what dlmread() did for the small file

%%
fid = fopen( 'd:\m\cssm\BerNoisySignal.dat', 'rt' );
cac = cell(0,1);
while not( feof( fid ) )
    chr = fgetl( fid );
    cac{end+1,1} = textscan( chr, '%f', 'Delimiter','\t' );
    disp( length(cac) )    % show progress
end
fclose( fid );
%%
wid = max( cellfun( @(c) numel(c{1}), cac ) );
C = complex( zeros( length(cac), wid ) );
%%
for jj = 1 : length(cac)
   num = reshape( cac{jj}{1}, 1,[] ); 
   C(jj,1:length(num)) = num;
end
%%
figure,imagesc(real(C))

outputs

and

>> C(30:35,1e5:1e5+2)
ans =
        0.473 +    0.24055i     -0.10531 +    0.21882i      0.60661 +    0.44345i
      0.30427 +    0.43949i      0.75655 -     1.0476i      0.20642 +    0.40645i
      0.82177 -    0.10199i      0.17799 +    0.10666i      0.44184 +    0.88519i
      0.29776 -    0.44033i     -0.25417 +  0.0089458i    -0.048546 +     0.9869i
      0.96475 +    0.48504i     -0.58236 -     0.7256i    -0.019985 -     0.6513i
       1.1374 -     0.1369i      0.19644 -   0.021786i      -1.0417 -    0.55171

>> C(28:33,wid-2:wid)
ans =
            0 +          0i            0 +          0i            0 +          0i
            0 +          0i            0 +          0i            0 +          0i
     -0.22192 +    0.68818i     -0.91552 -    0.17804i      -0.2485 +    0.90526i
            0 +          0i            0 +          0i            0 +          0i
            0 +          0i            0 +          0i            0 +          0i
            0 +          0i            0 +          0i            0 +          0i       

and

>> D = reshape( C, 70,[] );
>> whos C D
  Name       Size                   Bytes  Class     Attributes
  C         35x155000            86800000  double    complex   
  D         70x77500             86800000  double    complex  

[Irfan Mohideen]

[Irfan Mohideen]

On tha data import tool it shows [70:15300] as my dataset. However, when I use dlmread, i.e., BerNoisySignal = dlmread('BerNoisySignal.dat');

it concatenates all the data and gives me a [8922000:1 ] vector.

My data is at Data. Thanks

[per isakson]

I don't trust the data import tool. It tries to hard to be smart. Furthermore, I fail to interpret your screen-clips.

The file, data.txt, of your question contains two newline character. LF, at the end of the file.

>> C = dlmread( 'data.txt' );
>> whos C
  Name      Size                Bytes  Class     Attributes
  C         1x10000            160000  double    complex   

[per isakson]

"My data is at Data. Thanks"

github still says. This repository is empty.

Could the reason be related to permissions?

[Irfan Mohideen]

Please check This Data New Data

[per isakson]

I failed to use the link, New Data. The page, https://bitbucket.org/amohideen/data.git, is blank from my point of view. How am I supposed to download the data?

[Irfan Mohideen]

Can you git clone it?

git clone https://bitbucket.org/amohideen/data.git

[Irfan Mohideen]

or if you go Here Link you can download it (tested, sorry about the earlier blunder)

[per isakson]

"or if you go Here Link you can download" that suits me better.

I've added a script to my answer.

[Irfan Mohideen]

Thanks. I will check it update you.

[Irfan Mohideen]

Thanks. It worked.