Though I have read quite a bit, and tried quite a bit, I have yet to
find a nice way to overlay 2 or more curves in the same plot, with
different ranges.
Here is simplified sample code to demonstrate the question:
> plot(2*(seq(1,5)), type="l", axes=FALSE)
> curve(2*(seq(1,5)), type="b", add=TRUE)
Error in curve(2 * (seq(1, 5)), type = "b", add = TRUE) :
'expr' must be a function or an expression containing 'x'
> axis(2)
> curve(x^2, 1, 5, type="b", add=TRUE)
> axis(4)
Firstly, as an aside, I am not clear why 'curve' has a different syntax
compared to 'plot'. As a still beginner, I'd for one would be happy to
add curves to a plot; curves of just different parameters. Though, I
guess, there must be a good reason?
Mostly, however, I wonder how to plot a number of curves into an
original plot, that re-defines the min/max from the most recent curve.
In the example that I constructed, axis(2) does exactly the expected thing.
What I want to do next, though, with the least effort, is to add another
function in a manner that the added function is scaled, not according to
the first function (plot), but to fit into the plotting area. (The
example above overshoots the range).
Plus, how can I subsequently add the axis suitable to the most recent
function? That is, how can I render axis(4) to displaying the scale for
the second graph, created with 'curve'?
Thanks in advance,
Uwe
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