how to cut a curve so the y value doesn't go below a ertain number in matlab and the x value also stops in matlab

main.m
% Sample curve data
x = linspace(0, 10, 100); % Example x values
y = sin(x); % Example y values

% Specify the threshold for the minimum y value
yMinThreshold = -0.5;

% Filter the data to remove y values below the threshold
xFiltered = x(y >= yMinThreshold);
yFiltered = y(y >= yMinThreshold);

% Plot the original curve and the filtered curve
figure
plot(x, y, 'b-', 'LineWidth', 2) % Original curve is plotted in blue
hold on
plot(xFiltered, yFiltered, 'r-', 'LineWidth', 2) % Filtered curve is plotted in red

% Set a grid and labels
grid on
xlabel('x')
ylabel('y')

% Set the y-axis limits to include the threshold value
ylim([yMinThreshold, max(y)])

% Add a horizontal line at the threshold value
line(xlim, [yMinThreshold, yMinThreshold], 'Color', 'k', 'LineStyle', '--')

% Add a legend
legend('Original Curve', 'Filtered curve')

% Optional: Adjust the x-axis limits if needed
xlim([min(x), max(xFiltered)])
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