Help with 'underwater' plot
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I'm trying to create a so-called underwater plot for a time series ts, where all of the points that follow the most recent local maximum should be below an even water surface:
But if you take a closer look at my plot, you can see that some of the water surfaces actually have an unusual bump on the right side. I can't figure out why my code creates these bumps and how to avoid that. Any help would be appreciated..
Here's my code:
for i = 1:length(ts),
water(i) = max(ts(1:i));
end
area(water,'FaceColor',[0.04,0.52,0.78]);
hold on;
area(ts,'FaceColor',[0.68,0.47,0]);
采纳的回答
Walter Roberson
2013-12-31
1 个投票
At the point where the time series increases, max(ts(1:i)) is going to assume the new higher value. This is going to be connected to the previous max(ts(1:i-1)) that was the lower peak. So you have plot([y1 y2]) where y2 > y1, and that is going to be joined as a linear interpolation.
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Image Analyst
2013-12-31
1 个投票
Those are just the prior element. If you plot with markers, you'll see that it's merely drawing a straight line from the prior element to the new, higher element. If you want to make that smaller, you'll have to make the x axis have at least as many elements as pixels across in your plot. So, like if ts is 100 elements, make it 1000 elements and those "bumps" will be narrower.
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