add data to specific cell with writematrix in matlab

To add data to a specific cell in a matrix using writematrix function in MATLAB, you should first read the matrix data into a variable using the readmatrix function, modify the value of the specific cell, and then write the modified matrix data to the file using the writematrix function. Here's a sample code:

main.m
% Read matrix data from CSV file
data = readmatrix('matrix.csv');

% Modify the value of cell at row 2, column 4
data(2,4) = 10;

% Write the modified matrix data to the CSV file
writematrix(data, 'matrix.csv');
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In this example, we first read the matrix data from a CSV file 'matrix.csv' using the readmatrix function. We then modify the value of the cell at row 2, column 4 to 10, and write the modified matrix data back to the same file using the writematrix function. The writematrix function overwrites the contents of the file, including the modified cell value.