Hello Himanshu,
I see that you are looking to import a matrix from a text file containing corresponding elements and their indices. Let's create a sample text file and see how to import it into MATLAB.
As I dont have any text file , I am creating sample.txt with some random data
% Create a sample file
data = [1, 1, 5.5; 1, 2, 6.3; 2, 1, 7.8; 2, 2, 8.1];
writematrix(data, 'sample.txt', 'Delimiter', ',');
To import this text file into MATLAB, you can use the 'readmatrix' function:
data = readmatrix('sample.txt');
then you can extract the indices and values, then populate a matrix accordingly by using a simple 'for' loop :
% Extract indices and values
row_idx = data(:, 1);
col_idx = data(:, 2);
values = data(:, 3);
% Determine the size of the matrix
max_row = max(row_idx);
max_col = max(col_idx);
% Initialize the matrix
matrix = zeros(max_row, max_col);
% Populate the matrix
for i = 1:length(values)
matrix(row_idx(i), col_idx(i)) = values(i);
end
% Display the matrix
disp(matrix);
you can refer to following MathWorks documentation to know more about
I hope this helps you complete your task.
