How to plot this?

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Alecia Gill
Alecia Gill 2019-12-3
回答： Star Strider 2019-12-3
%Invert the data to use findpeaks to find the valleys
negdepthFeet = -depthFeet;
dur = duration(15,0,0);
% Use findpeaks
[lowerLowWater,lowerLowUTC] = findpeaks(negdepthFeet,
tideTime,'MinPeakProminence',10/12,'MinPeakDistance',dur);
lowerLowWater = -lowerLowWater;
MLLWmud = mean(lowerLowWater);
MLLW = 0;
% Tide level in feet relative to MLLW
feetMLLW = (depthFeet-MLLWmud);

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回答（1 个）

Star Strider
Star Strider 2019-12-3
I am not certain what you want to plot, since you did not specify that.
Try this:
tideTime = linspace(0, 4*pi); % Create Data
depthFeet = cos(5*tideTime).*sin(tideTime); % Create Data
negdepthFeet = -depthFeet;
[lowerLowWater,lowerLowUTCidx] = findpeaks(negdepthFeet);
lowerLowWater = -lowerLowWater;
MLLWmud = mean(lowerLowWater);
MLLW = 0;
figure
plot(tideTime, depthFeet)
hold on
plot(tideTime(lowerLowUTCidx), depthFeet(lowerLowUTCidx), 'vr')
hold off
grid
Experiment to get different results.

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