Jessica wrote:
> I am looking for an open-source smoother to down-sample data. I know
> there are many such as Hull Moving average, but I have data logged at
> the ms scale at non-fixed time intervals and I want to sample it on
> the second range at fixed time intervals. Does anyone know of a good
> smoother to do this? The key is that the input data is not logged at a
> constant frequency.


Can't answer your specific question. *BUT* I can suggest
information to give so you can get a meaningful answer:

1. What is the average sample rate?
2. What is the minimum and maximum time between samples?
2a. Possibly, what is the distribution of sample intervals?
3. What is your desired fixed "sample rate"?
4. What accuracy constraints of fit of reconstructed signal to
the actual? [Would linear interpolation between points be
adequate or would a 310947 degree polynomial be needed?
[Alright already, the degree was tongue in cheek, but intent
was serious.]

The art of getting "right answer" is asking "right question" ;>
[I *KNOW* from personal embarrassing experience.]