Creating "sections" of file

I have a file with 5 columns and a lot of rows. The values of the first three columns change every x rows. My goal is to split the file into sections:

0    0     0    x     y
0    0     0    x     y
0    1     5    x     y
0    1     5    x     y
0    2     9    x     y
0    2     9    x     y
.
.
.

So I want to read out the file and give all rows with 0 0 0 the section 1. So if i plot section 1 somehow, matlab will only consider these lines. Section 2 would be every line with 0 1 5 and again matalb will ignore every lines except for section 2 if I plot them. I could build some complicated loops around it, but I was told that matlab has some fancy ways to do something like that. As I said, my file is very big and I have tor ead it multiple times, so loops will slow down my script quite a lot probably. I can choose column 2 or 3 as a default value for the splitting, because these are the values that decide when to start a new section.

Thank you guys

Answer 1

[Star Strider]

This seems to work, using the reshape and permute functions:

x = 10;
y = 20;

M = [0    0     0    x     y
     0    0     0    x     y
     0    1     5    x     y
     0    1     5    x     y
     0    2     9    x     y
     0    2     9    x     y];

RowChange = 2;                                          % Constant For ‘’Constant Rows
NewMatrix = reshape(M, RowChange, [], size(M,2));
Sections = permute(NewMatrix, [1 3 2])                  % Page 3 Are The Sections

Sections(:,:,1) =
     0     0     0    10    20
     0     0     0    10    20

Sections(:,:,2) =
     0     1     5    10    20
     0     1     5    10    20

Sections(:,:,3) =
     0     2     9    10    20
     0     2     9    10    20

The ‘x’ for ‘every x rows’ is the ‘RowChange’ assignment, 2 here.

[jan mischke]

Cool thank you, worked perfectly fine!!!

[Star Strider]

My pleasure!