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 NAs 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 t. The version
approxTime1
is less flexible (only one single value for xout and only linear
interpolation) but has increased performance.
Both functions are faster when 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.
approx
inputs <-data.frame(time=1:10, y1=rnorm(10), y2=rnorm(10, mean=50)) input <-approxTime(inputs, c(2.5,3), rule=2)