mwin {astrochron} | R Documentation |
Determine start and end points for a moving window of fixed duration (e.g. 500 kiloyears). The dynamic window allows for adjustment of the number of data points in the window, so it has a constant duration in time or space.
mwin(dat,win,conv=1,verbose=T)
dat |
Your data frame containing stratigraphic data; any number of columns (variables) are permitted, but the first column should be a location identifier (e.g., depth, height, time). |
win |
Moving window size in units of space or time. |
conv |
Convention for window placement: (1) center each window on a stratigraphic level in 'dat' (DEFAULT), (2) start with the smallest location datum in 'dat', (3) start with the largest location datum in 'dat'. For options 2 and 3, the center of the window will not necessarily coincide with a measured stratigraphic level in 'dat', but edges of the data set are better preserved. |
verbose |
Verbose output? (T or F) |
This algorithm steps forward one stratigraphic datum at a time. The output consists of:
Average = this is the average of the depth/time values in the given window.
Center = this is the center of the 'win' size window.
Midpoint = this is midpoint between first and last observation in the window (for unevenly sampled data this is typically less than than the size of 'win').
A data frame containing: Starting index for window, Ending index for window, Location (average), Location (center), Location (midpoint)
# generate some noise ex1 <- ar1(npts=50,dt=1) # jitter sampling times ex1[1]=ex1[1]+rnorm(50,sd=3) # sort ex1 = ex1[order(ex1[,1],na.last=NA,decreasing=FALSE),] # run mwin mwin(ex1,win=10)