Nothing
LAG <- function(x, k=1, na.pad=TRUE) {
z <- lag(as.zoo(x), -k, na.pad)
dimnames(z) <- NULL
as.xts(z)
}
### POSIXct index
info_msg <- "test.lag_integer_POSIXt"
x <- .xts(1:5, 1:5 + 0.0)
expect_identical(lag(x), LAG(x), info = info_msg)
info_msg <- "test.lag_numeric_POSIXt"
x <- .xts(1:5 + 1.0, 1:5 + 0.0)
expect_identical(lag(x), LAG(x), info = info_msg)
info_msg <- "test.lag_logical_POSIXt"
x <- .xts(1:5 > 2, 1:5 + 0.0)
expect_identical(lag(x), LAG(x), info = info_msg)
### Date index
info_msg <- "test.lag_integer_Date"
x <- xts(1:5, as.Date("2016-01-01") - 5:1)
expect_identical(lag(x), LAG(x), info = info_msg)
info_msg <- "test.lag_numeric_Date"
x <- xts(1:5 + 1.0, as.Date("2016-01-01") - 5:1)
expect_identical(lag(x), LAG(x), info = info_msg)
info_msg <- "test.lag_logical_Date"
x <- xts(1:5 > 2, as.Date("2016-01-01") - 5:1)
expect_identical(lag(x), LAG(x), info = info_msg)
### Type-check failure errors
info_msg <- "test.lag_k_NA"
x <- .xts(1:5, 1:5)
expect_error(suppressWarnings(lag(x, "a")), # NA introduced by coercion
"'k' must be integer",
info = info_msg)
info_msg <- "test.lag_k_zero_length"
x <- .xts(1:5, 1:5)
expect_error(suppressWarnings(lag(x, 1L, "a")), # NA introduced by coercion
"'na.pad' must be logical",
info = info_msg)
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