I want to read a .txt file. I want to read each of the row from the .txt file except the first element of each row. each of the .txt file need to be converted to a matrix. Please some one suggest how to do it.

intput file:

1,0,-1,-1,0,0,-1,0,0,0
2,0,-1,-1,0,0,0,0,0,0
3,0,-1,-1,0,0,0,0,1,0
4,0,-1,0,0,0,-1,-1,0,0
5,0,-1,0,0,0,-1,0,0,0
6,0,-1,0,0,0,-1,1,0,0
7,0,-1,0,0,0,0,-1,1,0
8,0,-1,0,0,0,0,0,-1,0
9,0,-1,0,0,0,0,0,1,0
10,0,-1,0,0,0,0,1,-1,0
11,0,-1,0,0,0,0,1,0,0
12,0,-1,0,0,0,0,1,1,0
13,0,-1,0,0,0,1,0,0,0
14,0,-1,0,0,0,1,1,0,0
15,0,-1,1,0,0,0,0,0,0
16,0,-1,1,0,0,0,0,1,0
17,0,-1,1,0,0,1,0,0,0
18,0,0,0,0,0,0,1,1,0
19,0,0,0,0,0,1,1,0,0
20,0,0,0,1,0,0,1,0,0
21,0,0,0,1,0,0,1,1,0
22,0,0,1,1,0,0,0,1,0

Attempted code:

fileID=fopen('topo.txt','r');
formatSpec='%c';
A=fscanf(fileID,formatSpec);
disp(A);
[m, n] = size(A);
for i = 1:m
    vec{i} = A(i, :);
    B{i}=reshape(vec{i},3,3);
    
    disp("rows");
    disp(vec{i});
    disp("matrix");
    disp(B{i});
end;

[David Fletcher]

Any reason you can't just read the data as a table, and extract all columns bar the first?

A=readtable('topo.txt')
vec=A{:,2:end}

[Mouli Sarkar]

Actually I want extract data rowwise And after that want to form 3X3 matrix of each row.

Suppose the first row from the table is

1,0,-1,-1,0,0,-1,0,0,0

1st element of this row should be excluded while forming the matrix.

It will be like 0,-1,-1,0,0,-1,0,0,0. Using these elements I want to form 3X3 matrix.

This should be continued for all the rows present in the column.

And all the results should be in separate folder.

[David Fletcher]

What like this:

A=readtable('topo.txt')

for iter=1:size(A,1)
    vec(:,:,iter)=[A{iter,2:4};A{iter,5:7};A{iter,8:10}]
end

[Mouli Sarkar]

I am getting this kind of error

Unable to perform assignment because the size of the left side is 22-by-9 and the size of the right side is

3-by-3.

Error in try5 (line 3)

vec(:,:,iter)=[A{iter,2:4};A{iter,5:7};A{iter,8:10}];

[David Fletcher]

Works with me - have you cleared the old variables before running it

[Mouli Sarkar]

Thank you so much it worked

[David Fletcher]

Yeh, as I said it was likely because you hadn't cleared the old variables which are shared across all scripts. The 22x9 matrix that you reported in the error you mentioned couldn't have come from my script since vec is three dimensional in my script.

[Mouli Sarkar]

sir I need for help.

Suppose I have a circuit like this below image

here A is activating B and B is activating C.

For this circuit Matrix be like

source node

A B C

-------------------------------------------

A | 0 0 0

Target B | 1 0 0

node C | 0 1 0

That means j th elements are controling i th elements. If A is activating B then there is 1. If A was inhibiting B there will be -1 in the matrix. And the type of the link for inhibition would be like this ---| .

In the above code upto this matrix formation is done.

I want to creat separate .topo file for seperate matrics should be store in separate folder according to there number. And the text file should be in this format I am mentioning below.

Source Target Type

A B 1

B C 1

1 signifies activation

2 signifies inactivation

how can do this part of coding?

[Rik]

Please do not post a question in two places. You can post a link to the other thread instead.