Coloring different parts in a plot with different color

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?

[Image Analyst]

What do you consider "the complete area where red data are present"? The convex hull? Please attach a picture where you've manually colored in the regions you want colored.

[Swarnava Pramanik]

Hi Image Analysts, By "the complete area where red data are present" I mean the following figure.

[Swarnava Pramanik]

Hi Image Analyst, The convex hull would be appropriate.

[Walter Roberson]

Note that your convex hulls can overlap. boundary() can overlap as well but the risk is lower

Answer 1

[Walter Roberson]

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.

[Image Analyst]

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]

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