using area function - drawing below 0 of y axes

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michael
michael 2021-5-31
回答： Star Strider 2021-5-31
Hi,
I have some graph. I'd like to plot an area (the orange one). I'm using area function for positive values. how can I use it for both positive and negative?
It shall be dynamically as each time the graph is changing based on the data.
The maximum and minimum values may be the max and min of the graph.

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回答（2 个）

Jan
Jan 2021-5-31
Ran in:
This sounds like a job for a patch:
figure;
axes('XLim', [0, 10], 'Ylim', [-5, 5]);
patch([1,2,2,1], [-3,-3, 4,4], rand(1,3))
Star Strider
Star Strider 2021-5-31
Ran in:
To do this with the area function, changing the basevalue could work, however it is likely easier to use patch —
x = linspace(0,10);
y = sin(2*pi*x/5);
figure
patch([4 6 6 4], [-1 -1 1 1]*1.2, [.8 .3 .2], 'EdgeColor','none')
hold on
plot(x, y)
hold off
yline(0)
ylim([-1.5 1.5])
.

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