Plotting and Data Visualization

x = linspace(0, 2*pi, 200); y1 = sin(x); y2 = cos(x); y3 = sin(2*x) .* exp(-x/4); % Basic line plot figure; plot(x, y1, 'b-', 'LineWidth', 2); % blue solid line hold on; % don't clear on next plot plot(x, y2, 'r--', 'LineWidth', 1.5); % red dashed plot(x, y3, 'g-.', 'LineWidth', 1.5); % green dash-dot hold off; % Formatting title('Trigonometric Functions', 'FontSize', 14); xlabel('x (radians)'); ylabel('Amplitude'); legend({'sin(x)', 'cos(x)', 'sin(2x)e^{-x/4}'}, 'Location', 'best'); grid on; xlim([0, 2*pi]); ylim([-1.2, 1.2]); set(gca, 'XTick', 0:pi/2:2*pi, 'XTickLabel', {'0','π/2','π','3π/2','2π'}); % Other plot types figure; scatter(randn(100,1), randn(100,1), 50, 'filled'); title('Scatter Plot'); figure; bar([1,3,2,5,4,6], 'FaceColor', [0.2,0.4,0.8]); figure; histogram(randn(1000,1), 30, 'FaceColor', [0.8,0.3,0.2]);

x = linspace(-3, 3, 300);

figure('Position', [100, 100, 1000, 600]);

% subplot(rows, cols, index)
subplot(2, 3, 1);
plot(x, x.^2);
title('y = x^2'); grid on;

subplot(2, 3, 2);
plot(x, sin(x.*pi), 'r');
title('y = sin(\pi x)'); grid on;

subplot(2, 3, 3);
plot(x, exp(-x.^2));
title('Gaussian'); grid on;

subplot(2, 3, 4);
semilogy(1:50, cumsum(rand(1,50)));
title('Log y-axis'); grid on;

subplot(2, 3, 5);
t = linspace(0, 2*pi, 100);
polarplot(t, sin(2*t).^2);
title('Polar Plot');

subplot(2, 3, 6);
[X, Y] = meshgrid(-2:0.1:2, -2:0.1:2);
Z = X .* exp(-X.^2 - Y.^2);
imagesc(Z); colorbar; colormap('jet');
title('Heat Map');

sgtitle('MATLAB Plot Gallery', 'FontSize', 16, 'FontWeight', 'bold');

% 3D surface plot
[X, Y] = meshgrid(-3:0.1:3, -3:0.1:3);
Z = sin(sqrt(X.^2 + Y.^2)) ./ (sqrt(X.^2 + Y.^2) + eps);

figure;
surf(X, Y, Z, 'EdgeColor', 'none');
colormap('parula');
colorbar;
title('sinc function');
xlabel('X'); ylabel('Y'); zlabel('Z');
shading interp;   % smooth shading

% Contour plot
figure;
contourf(X, Y, Z, 20);  % filled contours, 20 levels
colormap('coolwarm');
colorbar;
title('Contour Plot');

% 3D line plot (parametric curve)
figure;
t = linspace(0, 6*pi, 500);
plot3(sin(t), cos(t), t, 'LineWidth', 2);
grid on;
title('3D Helix');
xlabel('X'); ylabel('Y'); zlabel('Z');
view(30, 20);  % azimuth, elevation

% Create a publication-quality figure
fig = figure('Units', 'inches', 'Position', [1,1,5,3.5]);

x = linspace(0, 4*pi, 500);
plot(x, sin(x), 'Color', [0.1,0.3,0.7], 'LineWidth', 1.5);
hold on;
plot(x, cos(x), 'Color', [0.8,0.3,0.1], 'LineWidth', 1.5);
hold off;

set(gca, 'FontSize', 11, 'FontName', 'Helvetica');
title('Signal Comparison', 'FontSize', 13);
xlabel('Time (s)'); ylabel('Amplitude');
legend({'sin', 'cos'}, 'FontSize', 10);
grid on; box off;

% Export as high-resolution PNG (300 DPI)
exportgraphics(fig, 'signal_plot.png', 'Resolution', 300);

% Export as vector PDF (best for LaTeX)
exportgraphics(fig, 'signal_plot.pdf', 'ContentType', 'vector');

% Export as SVG
print(fig, 'signal_plot', '-dsvg');