How to label the maximum and minimum value on a figure

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Joseph
Joseph 2013-3-14
评论： Image Analyst 2021-11-7
Find the time point that corresponds to the maximum and minimum value. Add a text label to the figure indicating the maximum value. Add a text label to the figure indicating the minimum value.

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Image Analyst
Image Analyst 2013-3-14
Have you used the help? Did you look up max, min, and text? You will use each of those functions to solve your homework exercise. Be sure to accept both output arguments of min() and max(). This should be a really really trivial problem, even for a beginner. It's so simple that we can't really even give hints without solving it. It's just 4 lines of code to call min(), max(), and 2 calls to text().
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Image Analyst
Image Analyst 2021-11-7
He's plotting something versus "time points", so t is a vector of the time points, in other words the x axis, and the x axis represents time.
% Create a sample signal.
t = linspace(0.1, 2*pi, 100); % Time axis
y = sin(t);
plot(t, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('t [Time in seconds]');
ylabel('Voltage [Volts]');
% Draw t axis
yline(0, 'LineWidth', 2);
% Find min y value and it's index.
[minSignal, indexOfMin] = min(y);
% Find time value at that min y value.
tMin = t(indexOfMin)
xline(tMin, 'Color', 'r', 'LineWidth', 2)
textLabel = sprintf(' Min of %.2f at t=%f', minSignal, tMin);
text(tMin, minSignal, textLabel, 'fontSize', 15, 'Color', 'r', 'VerticalAlignment','top')
% Find max y value and it's index.
[maxSignal, indexOfMax] = max(y);
% Find time value at that max y value.
tMax = t(indexOfMax)
xline(tMax, 'Color', 'r', 'LineWidth', 2)
textLabel = sprintf(' Max of %.2f at t=%f', maxSignal, tMax);
text(tMax, maxSignal, textLabel, 'fontSize', 15, 'Color', 'r', 'VerticalAlignment','bottom')
ylim([-1.2, 1.2])

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