[R-sig-Geo] STFDF Object Creation and Variogram

[Ankur Sarker]

Hi,I am trying to create a STFDF object and draw variogram. However, I am getting several errors. 
Here is my r code:
    #create count data    c0157ts <- as.numeric(c(t(c0157)))    c0001ts <- as.numeric(c(t(c0001)))
    #create coordinates       lat <- 0      lon <- 0      lat[1] <- 34.0793684      lon[1] <- -81.1301722      lat[2] <- 33.979127      lon[2] <- -81.321166398      sp <- data.frame(lat,lon)      coordinates(sp)=~lon+lat      projection(sp)=CRS("+init=epsg:4326")
    #create time object       time_index <- seq(from = as.POSIXct("2017-01-02 01:00", tz = 'UTC'), to = as.POSIXct("2017-03-22 00:00", tz = 'UTC'), by = "hour")
    #combine the data       mydata <- data.frame("count"=c(c0157ts,c0001ts)) 
    #create STFDF object    stfdf = STFDF(ozoneSP, time_index, mydata)
    #trying to create variogram    var <- variogramST(count~1,data=stfdf,tunit="hours",assumeRegular=F,na.omit=T)

which gives me following error:    Error in apply(do.call(cbind, lapply(ret, function(x) x$np)), 1, sum,  : dim(X) must have a positive length

I guess my STFDF object creation is not correct. Can anyone give me any hint? Which elements in STFDF object is not correct. Is it because of my time object?

Here is the description of STFDF object:str(stfdf)
Output:
    Formal class 'STFDF' [package "spacetime"] with 4 slots      ..@ data  :'data.frame':    3792 obs. of  1 variable:      .. ..$ count: num [1:3792] 40 32 64 40 55 89 71 43 69 44 ...      ..@ sp    :Formal class 'SpatialPoints' [package "sp"] with 3 slots      .. .. ..@ coords    : num [1:2, 1:2] -9031369 -9052631 4015522 4002120      .. .. .. ..- attr(*, "dimnames")=List of 2      .. .. .. .. ..$ : NULL      .. .. .. .. ..$ : chr [1:2] "lon" "lat"      .. .. ..@ bbox      : num [1:2, 1:2] -9052631 4002120 -9031369 4015522      .. .. .. ..- attr(*, "dimnames")=List of 2      .. .. .. .. ..$ : chr [1:2] "lon" "lat"      .. .. .. .. ..$ : chr [1:2] "min" "max"      .. .. ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slot      .. .. .. .. ..@ projargs: chr "+init=epsg:3395 +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0"      ..@ time  :An ‘xts’ object on 2017-01-02 01:00:00/2017-03-22 containing:      Data: int [1:1896, 1] 1 2 3 4 5 6 7 8 9 10 ...    - attr(*, "dimnames")=List of 2      ..$ : NULL      ..$ : chr "timeIndex"      Indexed by objects of class: [POSIXct,POSIXt] TZ: UTC      xts Attributes:      NULL


Here, I have attached the link of Rdat for your better understanding. Thanks for your help!
STFDF.RData

  
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STFDF.RData
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