Imagine I have a variable X
I use plot (X, type="l").
I want to "show" with colour the area between "the line of X" and the Zero
Axis.
So that if X have negative values the colored area will be below zero.
I´m trying to make this with polygons() but I´m not able....
Can you guide me to do it?
The other question is how can I show "the zero axis" in a plot?
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