shift.time: no applicable method for 'shift.time

[pverspeelt]

Description

shift.time is an exported function of xts, but if you try to use it, it will result in an error.

Error in UseMethod("shift.time") :
no applicable method for 'shift.time' applied to an object of class "c('xts', 'zoo')"

Expected behavior

shift.time.xts is the underlying function called when you have an xts object and you want to shift the time by n seconds.

Reason

I found that the reason why this doesn't work is that shift.time.xts is not exported as an s3 method in the namespace. Adding S3method(shift.time, xts) to the namespace will resolve this issue.

Minimal, reproducible example

Following code will result in the error

df1 <- data.frame(dates = Sys.time() + 1:10, 
                  values = 1:10)

df1_xts <- xts(df1$values, order.by = df1$dates)
shift.time(df1_xts, n = 60)

using the following code, the shift works
xts:::shift.time.xts(df1_xts, n = 60)

Session Info

R version 3.5.0 (2018-04-23)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)

Matrix products: default

locale:
[1] LC_COLLATE=Dutch_Netherlands.1252  LC_CTYPE=Dutch_Netherlands.1252    LC_MONETARY=Dutch_Netherlands.1252
[4] LC_NUMERIC=C                       LC_TIME=Dutch_Netherlands.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] xts_0.11-1 zoo_1.8-4 

loaded via a namespace (and not attached):
[1] compiler_3.5.0  tools_3.5.0     yaml_2.2.0      grid_3.5.0      lattice_0.20-35

[joshuaulrich]

Thanks for the report! I agree this is a bug, and agree with your proposed solution. Would you like to create a PR to add S3method(shift.time, xts) to NAMESPACE?

[pverspeelt]

Accidentally pushed close button when trying to link it to the PR :-(