stats_trend = [mean(trend_signal), std(trend_signal), var(trend_signal), min(trend_signal), max(trend_signal)]; fprintf('Trend Signal: Mean = %.3f, Std = %.3f, Var = %.3f, Min = %.3f, Max = %.3f\n', stats_trend);
% Subplot 6: Scatter plot (original vs filtered) subplot(3,2,6); scatter(signal, filtered_signal, 10, 'filled', 'MarkerEdgeAlpha', 0.5); title('Scatter: Original vs Filtered Signal'); xlabel('Original'); ylabel('Filtered'); grid on; axis square;
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% Subplot 2: Filtered signals subplot(3,2,2); plot(t, filtered_signal, 'b', 'LineWidth', 1.2); hold on; plot(t, filtered_trend, 'r', 'LineWidth', 1.2); title('Lowpass Filtered (fc = 1 Hz)'); xlabel('Time (s)'); ylabel('Amplitude'); legend('Filtered Signal', 'Filtered Trend', 'Location', 'best'); grid on;