[R-sig-Geo] Weird Error with variogramST

[Erin Hodgess]

Hello everyone:

I'm trying to run a variogram on an STFDF, but getting an odd error.
Here is the str of the data set, along with the error message.

> str(wind.data)
Formal class 'STFDF' [package "spacetime"] with 4 slots
  ..@ data   :'data.frame':     48 obs. of  1 variable:
  .. ..$ values: int [1:48] 78 79 84 82 79 80 84 83 81 83 ...
  ..@ sp     :Formal class 'SpatialPoints' [package "sp"] with 3 slots
  .. .. ..@ coords     : num [1:4, 1:2] -82.4 -80 -75.8 -76.3 23.1 ...
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : NULL
  .. .. .. .. ..$ : chr [1:2] "long" "lat"
  .. .. ..@ bbox       : num [1:2, 1:2] -82.4 20 -75.8 23.1
  .. .. .. ..- attr(*, "dimnames")=List of 2
  .. .. .. .. ..$ : chr [1:2] "long" "lat"
  .. .. .. .. ..$ : chr [1:2] "min" "max"
  .. .. ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slot
  .. .. .. .. ..@ projargs: chr "+proj=longlat +datum=WGS84 +no_defs"
  .. .. .. .. ..$ comment: chr "GEOGCRS[\"unknown\",\n    DATUM[\"World
Geodetic System 1984\",\n        ELLIPSOID[\"WGS 84\",6378137,298.25722"|
__truncated__
  ..@ time   :An xts object on 2024-01-01 12:00:00 / 2024-12-01 12:00:00
containing:
  Data:    integer [12, 1]
  Columns: timeIndex
  Index:   POSIXct,POSIXt [12] (TZ: "GMT")
  ..@ endTime: POSIXct[1:12], format: "2024-02-01 12:00:00" "2024-03-01
12:00:00" ...
> variogramST(values~1,wind.data,na.omit=TRUE)
  |====================================================                  |
 75%Error in `[.xts`(x using time, j) : subscript out of bounds
In addition: Warning message:
In variogramST(values ~ 1, wind.data, na.omit = TRUE) :
  strictly irregular time steps were assumed to be regular
>
This is R-4.4.3.

Any suggestions would be much appreciated.

Sincerely,
Erin

Erin Hodgess, PhD
mailto: erinm.hodgess using gmail.com

	[[alternative HTML version deleted]]