approxTime {simecol} | R Documentation |
Return a data frame, matrix or vector which linearly interpolates data from a given matrix or data frame.
approxTime(x, xout, ...) approxTime1(x, xout, rule = 1)
x |
a matrix or data frame with numerical values giving coordinates of points to be interpolated. The first column is interpreted as independend variable (e.g. time), the remaining columns as dependend variables. |
xout |
a vector (or single value for approxTime1 ) of
independend values specifying where interpolation has to be done. |
rule |
an integer describing how interpolation is to take place
outside the interval [min(x), max(x)]. If rule is 1 then
NA s are returned for such points and if it is 2, the value at
the closest data extreme is used. |
... |
optional parameters passed to approx . |
The functions can be used for linear interpolation with a complete
matrix or data frame. This can be used for example in the main
function of an odeModel
to get input values at a specified time
xout
. The version approxTime1
is less flexible (only one
single value for xout and only linear interpolation) but has increased
performance. Both functions are faster if x
is a matrix
instead of a data frame.
approxTime
returns a matrix resp. data frame of the same
structure as x
containing data which interpolate the given data
with respect to xout
. approxTime1
is a performance
optimized special version with less options than the original
approx
function. It returns an interpolated vector.
inputs <- data.frame(time = 1:10, y1 = rnorm(10), y2 = rnorm(10, mean = 50)) input <- approxTime(inputs, c(2.5, 3), rule = 2)