I have a matrix read from a text file and I want to subtract more matrix, delimited by the repeating line: 9999 0 0 0 0 0. I want to have as a result 5 different matrix, in this case. How can I do? thank you

   501   1.547   0 0 0 0 
   500       73.164   100.4764   333.3890    1.500    00
   502       58.793    99.6720   160.0586    1.500    00
9999 0 0 0 0 0
   502   1.560    0 0 0 0 
   501       58.790   100.4551    60.7974    1.500    00
   503       37.525    99.3758   200.0799    1.500    00
9999 0 0 0 0 0
   503   1.592    0 0 0 0 
   502       37.524   100.8832   197.9390    1.500    00
   504       69.050    99.8927   277.4128    1.500    00
9999 0 0 0 0 0
   504   1.630    0 0 0 0 
   503       69.060   100.2973   130.6244    1.500    00
   501       52.676   101.3383   229.5360    1.500    00
9999 0 0 0 0 0
   501   1.547    0 0 0 0    
   504       52.675    98.8623    77.7161    1.500    00
   500       73.164   100.4764   333.3890    1.500    00

As result for example, the first one should be

   501   1.547     0 0 0 0  
   500       73.164   100.4764   333.3890    1.500    00
   502       58.793    99.6720   160.0586    1.500    00
the second one
   502   1.560    0 0 0 0 
   501       58.790   100.4551    60.7974    1.500    00
   503       37.525    99.3758   200.0799    1.500    00
..........the last one
   501   1.547    0 0 0 0    
   504       52.675    98.8623    77.7161    1.500    00
   500       73.164   100.4764   333.3890    1.500    00

[Jan]

The shown result is not a matrix, because it is not rectangular. So please explain exactly, what you want to achieve.

[Image Analyst]

Your "result" is a 1 by 2 row vector followed by a 2 by 6 matrix. Exactly where is the 5 by 5 matrix in the result, and exactly what was subtracted from what to get your result? Like if you did the subtraction C = A - B, what were A and B? And what was C, since it's not your result and we don't see any 5 by 5 matrix in sight?

And you say "depending on the repeating line" but that is not a condition - it's just simply a repeating line and not a true or false condition. So what depends on what? A condition needs to be true or false. For example you might say "depending on if 9999 is in the line, or not in the line"

[Loghin Ana-Maria]

Sorry, I'm new to Matlab The text file is read with dImread, so I have a matrix of 13 lines and 6 columns, with zeros completing the vector line. I have modified the question.

[Stephen23]

@Loghin Ana-Maria: Can you please upload the actual file? This makes us helping you a lot easier.

[Loghin Ana-Maria]

ok, of course...here it is the text file

Answer 1

[Stephen23]

EDIT: to use the newly uploaded data file.

Probably the easiest way to split this would be to do this after reading the file into MATLAB:

% Read the file as text:
fid = fopen('drumuire.txt','rt');
C = cell2mat(textscan(fid,'%f%f%f%f%f%f'));
fclose(fid);
% identify groups between 9999's:
idx = [1,diff(C(:,1)'~=9999)];
idy = find(idx<0)-find(idx>0);
idy(2,:) = 1;
% Split data into a cell array:
D = mat2cell(C,idy(:),size(C,2));
D(2:2:end) = []; % optional...

This code automatically adjusts to the number of rows (i.e. must not be groups of three), but assumes that the rows with 9999 only occur individually (i.e. are not grouped together, two or more rows), and that the first row is not a 9999 row but that the last row is. This code returns all of the data in a cell array:

>> D
D = 
    [3x6 double]
    [3x6 double]
    [3x6 double]
    [3x6 double]
    [3x6 double]
>> D{1}
ans =
  501.0000    1.5470       NaN       NaN       NaN       NaN
  500.0000   73.1640  100.4764  333.3890    1.5000         0
  502.0000   58.7930   99.6720  160.0586    1.5000         0

[Loghin Ana-Maria]

yes, that's it Thank you very much