# Bound fill between two bounds, data given

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Lukasz Skowron on 10 Nov 2018
Commented: jonas on 10 Nov 2018
Hi. I have:
Upper Bound: UB = [5.522, 5.326, 5.250, 5.228, 5.198, 5.190];
Lower Bound: LB = [4.682, 4.874, 5.070, 5.069, 5.119, 5.122];
No. of elements: No = [388, 797, 1599, 3302, 6801, 13809];
I want to shade the area between those two bounds. I found answered questions to the same question, but I don't know how to translate it to my data. Also is there way to make the shaded area slightly opac or make it comprise of tiny dots? I have a couple of bounds and they might coincide. Also is there a way to add the shaded area to the legend (as shown on the picture)? Basically, I want to achieve something like this:
Man thanks for the help!
Lukasz

jonas on 10 Nov 2018
Edited: jonas on 10 Nov 2018
Should be easy using either fill or polygon. Just make sure you close the curve by flipping one of the bounds. For example:
UB = [5.522, 5.326, 5.250, 5.228, 5.198, 5.190];
LB = [4.682, 4.874, 5.070, 5.069, 5.119, 5.122];
No = [388, 797, 1599, 3302, 6801, 13809];
y = [UB flip(LB)];
x = [No flip(No)];
h = fill(x,y,'k','facealpha',0.1)
The output patch object of fill can be used as input to the legend.
You can use a FEX function for pattern fills, such as hatchfill. However, you will be able to distinguish overlapping areas if you play around with the facealpha argument of fill.

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jonas on 10 Nov 2018
fill creates a patch object and you can get all its properties by calling the patch handle that is output from fill, i.e.
h = fill(...)
get(h)
Or you can check the doc on patch properties. Some interesting properties would be edgecolor, facecolor and facealpha. You can always set a color to 'none' to make it invisible.
I'm not sure what you mean by "markers on your bounds". You can place markers on the patch edges by:
set(h,'marker','x')
The edges are basically line objects, so there is absolutely no reason to overlay lines/markers using plot. If you want a "pattern fill" then you have to use some FEX function.
Lukasz Skowron on 10 Nov 2018
Thank you a lot for the help!
jonas on 10 Nov 2018
Cheers!