variogram runtime error after upgrade to v2.0-5

[sambo1972]

Hi,

The error below is thrown at runtime when attempting to generate a variogram on an STFDF data frame.

This only occurred after updated my R packages - which were pretty old but this code did work previously. The specific example is code taken from "Spatio-Temporal Statistics with R" which has a companion package "STRbook" (https://github.com/andrewzm/STRbook)

To reproduce first install package STRbook (just to get this spatial object) and then execute:

# obs from July 1993 only
data("STObj3", package="STRbook")
STObj4 <- STObj3[, "1993-07-01::1993-07-31"]

# note gstat::variogram actually calculates sample semivariogram
vv <- variogram(object = z ~ 1 + lat, # fixed effect component
+                 data = STObj4,
+                 width = 80,           # spatial bin of 80 km
+                 cutoff = 1000,        # only consider points < 1000km apart
+                 tlags = 0.01:6.01     # 0 days to 6 days
+                 )
  |                                             |   0%

Error in variogramST(formula = object, locations = locations, data = data,  : object 'ret' not found

[sambo1972]

@edzer this issue has been duplicated here:: #66

I can confirm that the variogram function successfully runs on a spatial data frame in versions 2.0-0, 2.0-2 and 2.0-4.

The fail condition above was introduced in 2.0-5.

[edzer]

Thanks, I can reproduce that.