arrayspline: Applies a spline function to an array of values
| arrayspline | R Documentation |
Applies a spline function to an array of values
Description
arrayspline is used to derive e.g. hourly climate data from e.g. daily values.
Usage
arrayspline(a, tme, nfact = 24, out = NA)
Arguments
a |
a three-dimensional array (row, column, time) |
tme |
an object of class POSIXct of times for |
nfact |
indicates the time interval for which outputs are required. E.g to derive hourly from daily data |
out |
an optional character vector indicating the time for which the output is required. Format must be as for |
Details
arrayspline uses the Forsythe, Malcolm and Moler method of splining, as specified by
"fmm" in spline(). If a[i, j, ] is a vector of NAs, then tthe corresponding vector in
the output array is also a vector of NAs. It is assumed that all spatial data within a have
equivelent times. I.e. the time of both a[1, 1, 1] and a[1000, 1000, 1] is identical and
equal to tme[1].
Value
If out is unspecified, a three dimensional array of size c(a[1], a[2], (length(tme) - 1) * nfact + 1) is returned.
If out is specified, a three dimensional array of size c(a[1], a[2], length(out)) is returned.
Examples
library(terra)
tme <- as.POSIXct(c(0:364) * 24 * 3600, origin="2010-01-01", tz = "GMT")
h <- arrayspline(huss, tme, out = "2010-05-01 11:00")
plot(rast(h),
main = "Specific humidity 2010-05-01 11:00")
