How to get this type of output ? (Strokes second order Wave theory) Please help .
The 
MATLAB: Dynamic pressure m m
strokes second order wave theorywave theorywaveletWavelet Toolbox
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Partha - if you are trying to give your figure (composed of several subplots) a title, then consider using the function suplabel found in the File Exchange.
Try this:
% Make noise-free signal.
period = 40;amplitude = 5;x = linspace(0, 40, 500);y = amplitude * sin(2 * pi * x / period);plot(x, y, 'b-', 'LineWidth', 2);grid on;fontSize = 20;xlabel('x', 'FontSize', fontSize);ylabel('y', 'FontSize', fontSize);% Make a noisy signal
noiseAmplitude = 60;noise = noiseAmplitude * rand(size(y)) - noiseAmplitude/2;% Blur the noise to make it smoother.
noise = movmean(noise, 80);noisyy = y + noise;hold on;plot(x, noisyy, 'r-', 'LineWidth', 2);% Compute the sum
ySum = y + noisyy;darkGreen = [0, 0.5, 0];plot(x, ySum, '-', 'Color', darkGreen, 'LineWidth', 2);legend('y1', 'y2', 'y1+y2');
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