Coloring different parts in a plot with different color

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Swarnava Pramanik
评论： Walter Roberson 2017-2-4
Hi,
I have the following plot and I want to color the complete area where red data are present with a different color as compared to the area where blue data are present. Is there any way to do it? I tried with fill and area functions but no luck. Can anyone please help me with this?
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Walter Roberson
Walter Roberson 2017-2-4
Note that your convex hulls can overlap. boundary() can overlap as well but the risk is lower

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Walter Roberson
Walter Roberson 2017-2-4
编辑：Walter Roberson 2017-2-4
You can select the appropriate points, boundary() them, use that to extract an ordered subset of the original points. fill() using those x and y position.
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Image Analyst
Image Analyst 2017-2-4
How do you decide whether to fill an area using fill(), patch(), or area()? What's the difference between them? When would you use each instead of the others?
Walter Roberson
Walter Roberson 2017-2-4
area fills between a given y and the y=0 axis.
fill is a front end for patch.
fill creates a filled polygon by calling patch

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