How to show iterations and values of variables serially in a column in a figure? Help me plz

I solved linear equations by using Gauss-Seidel method and showed the iterations and values of x1,x2,x3,x4 in columns in the command window.But I can't do it in a figure. i wrote this:

x2=0;x3=0;x4=0;k=0; disp(' n x1 x2 x3 x4') for i=1:10 k=k+0.1; x1=0.3+ 0.2*x2+0.1*x3+0.1*x4; x2=1.5+ 0.2*x1+0.1*x3+ 0.1*x4; x3=2.7+0.1*x1+0.1*x2+0.2*x4; x4=-0.9+0.1*x1+0.1*x2+0.2*x3;

disp([i' x1' x2' x3' x4']) end

figure(1) axis([0 1 0 1]); grid on text(0.15,0.95,'n') text(0.25,0.95,'x1') text(0.35,0.95,'x2') text(0.45,0.95,'x3') text(0.55,0.95,'x4')

How can i show the values of x1,x2,x3 and x4 serially one under one in that figure? Plz help

Answer 1

[nick]

Hello Shams,

To display the remaining values of x1,x2,x3 and x4 serially in order, 'for' loop can be utilised as shown below:

x2 = 0; x3 = 0; x4 = 0;
iterations = 10; 
results = zeros(iterations, 4); 


for i = 1:iterations
    x1 = 0.3 + 0.2 * x2 + 0.1 * x3 + 0.1 * x4;
    x2 = 1.5 + 0.2 * x1 + 0.1 * x3 + 0.1 * x4;
    x3 = 2.7 + 0.1 * x1 + 0.1 * x2 + 0.2 * x4;
    x4 = -0.9 + 0.1 * x1 + 0.1 * x2 + 0.2 * x3;
    results(i, :) = [x1, x2, x3, x4];
end

figure(1);
axis off; 
hold on;

% Add column headers
text(0.1, 1, 'n', 'FontWeight', 'bold');
text(0.3, 1, 'x1', 'FontWeight', 'bold');
text(0.5, 1, 'x2', 'FontWeight', 'bold');
text(0.7, 1, 'x3', 'FontWeight', 'bold');
text(0.9, 1, 'x4', 'FontWeight', 'bold');

% Add iteration results
for i = 1:iterations
    y_position = 1 - i * 0.05; % Adjust y position for each iteration
    text(0.1, y_position, num2str(i));
    text(0.3, y_position, num2str(results(i, 1), '%.4f'));
    text(0.5, y_position, num2str(results(i, 2), '%.4f'));
    text(0.7, y_position, num2str(results(i, 3), '%.4f'));
    text(0.9, y_position, num2str(results(i, 4), '%.4f'));
end

hold off;

Kindly refer to the documentation by executing the following command in MATLAB Command Window to know more about 'hold' function :

doc hold