How would i run different events from the same .txt file?

I run a program that uses the following information of a .txt file

4 0 0
1 1 1
3 1 1
2 3 1
3 2 1

in which the first number is the number of stations and than the coordinates x,y,z for these four stations. Now i want to expand the program to run for more events in which i have like

4 0 0
1 1 1
3 1 1
2 3 1
3 2 1
3 0 0
1 3 1
2 3 3
3 1 2
.
.
.
n 0 0 
xn yn zn

till 'n' events, being this all separate events. Is there a way to read it as different blocks but with one program? P.S. the zeros after the number of stations is because i use the command 'load' ideally i wouldn't write these zeros. P.S.2 the number of stations and the coordinates don't necessarily need to be in the same .txt file

[njj1]

Is there a definite number of x, y, z coordinate measurements after a single station reading? If so, you could import the whole matrix then use reshape...

What does the raw .txt file data look like?

[Feliciano Döring]

The number of x,y,z coordinate measures are determined by the number of stations, so if it is a 4 such as above there are going to be 4 coordinate readings

[Bob Thompson]

Is this program independent of MATLAB? I know that you can execute programs and use inputs, but if the program is not in MATLAB itself then the ability to complete multiple runs within a single session of the program is something that needs to be built into the program itself. It is possible to use a loop to run the program multiple times in MATLAB, but that's a bit different.

[Guillaume]

Reading a text file and splitting it into whatever you want is easy. While I understood very well how you want the file to be decoded, I did not understand at all how you want that data to be stored in memory.

The easiest would be to use a cell array where each cell is one of these event, e.g. for your example:

events = {[1 1 1; 3 1 1; 2 3 1; 3 2 1], [1 3 1; 2 3 3; 3 1 2]}

a 1x2 cell array (2 events) where the 1st cell (1st event) is a 4x3 matrix (4 stations) and the 2nd cell (2nd event) is a 3x3 matrix (3 stations).

Is that what you want?

[Feliciano Döring]

Bob Nbob, no, i use only matlab. That is what i want to do actually, run the program again and again but using different data that is contained in this .txt file and in such a way that it only runs these kind of blocks at a time

[Feliciano Döring]

Guillaume, i think that is it, i want to have multiple arrays, so that i can run them through the code individually.

Answer 1

[njj1]

You should import the entire matrix and then begin the splitting process.

A = dlmread('Nest.txt',' '); %this assumes there are no headers or columns that you don't want
k = 1;
while 1
  n = A(1,1); %this is presumably the number of rows that you want to take after the first line
  X{k} = A(2:n+1,:);
  if size(A,1)<n+2
    break
  end
  A = A(n+2:end,:);
  k = k+1;
end

Hopefully this works for you.

[Feliciano Döring]

Thanks! one thing though, my code relies on getting the matrix of each station, so for these two stations i would have a 4x3 and 3x3 matrices, how would i get the information of each matrix?

[njj1]

Oh, does it always alternate between a 4x3 and a 3x3 matrix? If so, use this code:

A = dlmread('Nest.txt',' '); %this assumes there are no headers or columns that you don't want
k = 1;
while 1
  n = A(1,1); %this is presumably the number of rows that you want to take after the first line
  X{k,1} = A(2:n+1,:);
  if size(A,1)<n+2
    break
  end
  A = A(n+2:end,:);
  X{k,2} = A(2:n+1,:);
  if size(A,1)<n+2
    break
  end
  A = A(n+2:end,:);
  k = k+1;
  %for each k, we record 2 separate matrices into a cell array
end

[njj1]

Actually, I may still be confused about what you are looking for... In the code that I initially wrote, each station is recorded as a separate matrix in the cell array 'X'. So you will end up with a 1xn cell array.

[Feliciano Döring]

No, the matrices are as i put them, so it's not necessarily 4x3 than 3x3, it can be any different types of matrices, the thing is the code i have uses the information on these different matrices, so i would need a code to first read the information on the .txt file to then use that information(of each group of matrix) to run through my code one at a time.

[njj1]

Can you provide an example of what the text file looks like? The code I placed as an answer initially should work with the type of data that you posted in your original question.

[Feliciano Döring]

sure, here it is. It is the same i posted above. Ideally i would place the x,y,z-data in this text file with two or more events and it would run, and better would it be if i didn't have to write these zeros.

[njj1]

If you have data that looks like what you have in your text file, the output from my code is:

X = {[1 1 1; 3 1 1; 2 3 1; 3 2 1], [1 3 1; 2 3 3; 3 1 2]};

I thought this is what you're after...

[Feliciano Döring]

Oh wow, thank you!