rearranging txt file in matlab

I need help rearranging this data into table in matlab. I want the first row to start from 200.1012 and ends at -999.2555. The next row to start from 200.2536 and ends at -999.2566. It's a large dataset and I will like to rearrange it in such manner. The data is a text file(.txt). I simply want first number (200.1012) to be arranged in such a way that the next vertical number below it is has 200.2536 and so on til it get to the last number on the first row (-999.2555), which has the number vertically below to be (-999.2566). Thanks in advance.

       200.1012 
     -999.2500         4.2655      -999.2500      -999.2500      -999.2500 
     -999.2500         9.1020      -999.2500      -999.2500      -999.2500 
     -999.2500      -999.2500      -999.2500      -999.2500      -999.2500 
     -999.2500      -999.2500      -999.2500      -999.2500      -999.2500 
      177.0910      -999.2500    444575.0938   6601617.5000      -999.2555 
       200.2536 
     -999.2500         4.2655      -999.2500      -999.2500      -999.2500 
     -999.2500        10.7474      -999.2500      -999.2500      -999.2500 
     -999.2500      -999.2500      -999.2500      -999.2500      -999.2500 
     -999.2500      -999.2500      -999.2500      -999.2500      -999.2500 
      177.2434      -999.2500    444575.0938   6601617.5000      -999.2566

Answer 1

[Thorsten]

D = textscan(fopen('test.txt'), '%f');

% format to rows with N=26 values
N = 26; 
D = reshape(D{1}, [], N);