I want to plot (filter) the highest value among both y1, y2.

I have this graph; I want to plot the highest value among both y1, y2. if blue line is highest want to plot the blue line. if red line is highest want to plot the red line.

I use this code, plot(x1, y1, x2, y2);

Answer 1

[Chunru]

% Generate some data
x1 = sort(rand(50, 1));
y1 = randn(size(x1)) + 0.4;

x2 = sort(rand(50, 1));
y2 = randn(size(x2)) + 0.3;

plot(x1, y1, 'r', x2, y2, 'b')
xmin = min([x1; x2]);
xmax = max([x1; x2]);
xq = linspace(xmin, xmax, 1000);
hold on

% Interpolation and max
y1q = interp1(x1, y1, xq, 'linear', 'extrap');
y2q = interp1(x2, y2, xq, 'linear', 'extrap');
plot(xq, max(y1q, y2q), 'k', 'LineWidth', 2);

legend("y1", "y2", "max", "Location", "Best")

[omran alshalabi]

Thank you,

it is solved the issue.