approx(x, y, xout, method="linear", n=50, rule=1,f=0)
x,y
| vectors giving the coordinates of the points to be interpolated. Alternatively a single plotting structure can be specified. |
xout
| an optional set of values specifying where interpolation is to take place. |
method
| this specifies the interpolation method to be used. Choices are "linear" or "constant" |
n
|
If xout is not specified, interpolation
takes place at n equally spaced points spanning the interval
[min(x),max(x)].
|
rule
|
an integer describing how interpolation is to take
place outside the interval
[min(x),max(x)].
If rule is 1 then NAs
are returned for such points and if it is 2,
the value at the closest data extreme is used.
|
f
|
For method="constant" a number between 0 and 1 inclusive indicating a compromise between left- and right-continuous step functions. If y0 and y1 are the values to the left and right of the point then the value is y0*f+y1*(1-f) so that f=0 is right-continuous and f=1 is left-continuous
|
n x and y coordinates
which linearly interpolate the given data points.
The function approxfun returns a function which will perform linear
interpolation of the given data points. For a given set of x
values this function will return the corresponding interpolated
values. This is often more useful than approx.
approxfun, spline, splinefun.