Return a data frame, matrix or vector which linearly interpolates data from a given matrix or data frame.
a matrix or data frame with numerical values giving coordinates of points to be interpolated. The first column needs to be in ascending order and is interpreted as independent variable (e.g. time), the remaining columns are used as dependent variables.
a vector (or single value for
an integer describing how interpolation is to take place
outside the interval [min(x), max(x)]. If
optional parameters passed to
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
x containing data which interpolate the given data
with respect to
approxTime1 is a performance
optimized special version with less options than the original
approx function. It returns an interpolated vector.
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