How to read data into array in MATLAB? - arrays

Question

I'm writing a code to solve Ax=b using MATLAB's x=A\B. I believe my problem lies within getting the data from the files into the array. Right now, the solution vector is coming out to be a load of 0's
The matrices I'm using have 10 rows respectively. They are aligned correctly in the text files.
% solve a linear system Ax = b by reading A and b from input file
% and then writing x on output file.
clear;
clc;
input_filename = 'my_input.txt';
output_filename = 'my_output.txt';
% read data from file
fileID = fopen('a_matrix.txt', 'r');
formatSpec = '%d %f';
sizeA = [10 Inf];
A = load('b_matrix.txt');
A = A'
file2ID = fopen('b_matrix.txt','r');
formatSpec2 = '%d %f';
sizeB = [10 Inf];
b = load('b_matrix.txt');
fclose(file2ID);
b = b'
% solve the linear system
x = A\b;
% write output data on file
dlmwrite('my_output.txt',x,'delimiter',',','precision',4);
% print screen
fprintf('Solution vector is: \n');
fprintf('%4.2f \n', x);

Answer 1

I answered my own question but I felt the need to share in case anyone else has similar troubles.
% solve a linear system Ax = b by reading A and b from input file
% and then writing x on output file.
clear;
clc;
input_filename = 'my_input.txt';
output_filename = 'my_output.txt';
% read data from file
f = textread('a_matrix.txt', '%f');
vals = reshape(f, 11, []).';
A = vals(:,1:10);
b = vals(:,11);
% solve the linear system
x = A\b;
% write output data on file
dlmwrite('my_output.txt',x,'delimiter',',','precision',4);
% print screen
fprintf('Solution vector is: \n');
fprintf('%4.2f \n', x);
I ended up combining the 'a' and 'b' matrix into a single text file for simplicity. Now, MATLAB reads data in by columns, so it is necessary to use 'reshape' in order to fit the data within the array correctly. Then, I filtered out the information from the single matrix by columns, using the 'vals' function as seen in my code. The 'A' matrix is essentially all numbers in columns 1 through 10, while the 'B' matrix is the 11th (and final) column.
Using MATLAB's x=A\b function, I was able to solve the linear system of equations.