[R] Is there a time series resampling function ?

[AltShift]

I need a function for regularising the time base of electronically acquired
signals (i.e. vectors of samples with a nominally constant time base). 

For example, the accelerometer in my smartphone can deliver data at about 50
Hz, but the sampling rate varies by about 5% throughout a recording. I have
developed signal processing functions that assume a constant sample rate, so
I need to modify my input data vectors so that this assumption becomes true.
Furthermore, if I want to combine signals from different sources that have
different sampling rates, I will be obliged to harmonise the time bases,
somehow.

I have written routines in other languages to interpolate (generate a larger
number of regularly spaced samples from the input series) or, what I call,
"intrapolate" (generate a smaller number of regularly spaced samples from
the input series), so it wouldn't be too hard form me to write a function
that covers both, but I prefer not to reinvent wheels (unless my wheel is
markedly better!)

Can anyone tell me if there is already a package that might cover what I
need?




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