From f01afa0a8a556bd2ab252e08c64f8162f0c188ee Mon Sep 17 00:00:00 2001
From: Achim Zeileis <Achim.Zeileis@R-project.org>
Date: Thu, 13 Apr 2023 11:13:20 +0000
Subject: [PATCH] version 1.8-12

---
 DESCRIPTION                     |   8 +++----
 MD5                             |  40 ++++++++++++++++----------------
 NAMESPACE                       |   5 ++--
 NEWS                            |  16 +++++++++++++
 R/as.zoo.R                      |   2 +-
 R/ggplot2.zoo.R                 |  12 ++++++----
 R/index2char.R                  |   2 ++
 R/na.approx.R                   |   2 +-
 R/window.zoo.R                  |  10 ++++----
 build/vignette.rds              | Bin 511 -> 511 bytes
 inst/CITATION                   |  29 +++++++++--------------
 inst/doc/zoo-design.pdf         | Bin 34380 -> 34377 bytes
 inst/doc/zoo-faq.pdf            | Bin 89878 -> 89878 bytes
 inst/doc/zoo-quickref.pdf       | Bin 66945 -> 66945 bytes
 inst/doc/zoo-read.pdf           | Bin 65599 -> 65599 bytes
 inst/doc/zoo.pdf                | Bin 199443 -> 199443 bytes
 man/ggplot2.zoo.Rd              |  23 +++++++++---------
 man/zoo.Rd                      |   1 +
 src/coredata.c                  |  14 +++++------
 src/lag.c                       |  14 +++++------
 tests/Examples/zoo-Ex.Rout.save |  13 +++++------
 21 files changed, 102 insertions(+), 89 deletions(-)

diff --git a/DESCRIPTION b/DESCRIPTION
index 5256888..ef3fda5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: zoo
-Version: 1.8-11
-Date: 2022-09-15
+Version: 1.8-12
+Date: 2023-04-11
 Title: S3 Infrastructure for Regular and Irregular Time Series (Z's
         Ordered Observations)
 Authors@R: c(person(given = "Achim", family = "Zeileis", role = c("aut", "cre"), email = "Achim.Zeileis@R-project.org",
@@ -22,7 +22,7 @@ Imports: utils, graphics, grDevices, lattice (>= 0.20-27)
 License: GPL-2 | GPL-3
 URL: https://zoo.R-Forge.R-project.org/
 NeedsCompilation: yes
-Packaged: 2022-09-15 15:20:12 UTC; zeileis
+Packaged: 2023-04-11 21:24:32 UTC; zeileis
 Author: Achim Zeileis [aut, cre] (<https://orcid.org/0000-0003-0918-3766>),
   Gabor Grothendieck [aut],
   Jeffrey A. Ryan [aut],
@@ -30,4 +30,4 @@ Author: Achim Zeileis [aut, cre] (<https://orcid.org/0000-0003-0918-3766>),
   Felix Andrews [ctb]
 Maintainer: Achim Zeileis <Achim.Zeileis@R-project.org>
 Repository: CRAN
-Date/Publication: 2022-09-17 19:50:02 UTC
+Date/Publication: 2023-04-13 12:13:20 UTC
diff --git a/MD5 b/MD5
index 0fb37f4..ac1432c 100644
--- a/MD5
+++ b/MD5
@@ -1,24 +1,24 @@
-947ac1f5bb8a05ca965cd09008ae60bf *DESCRIPTION
-20c2a110c3d865ff995f5ecf2815bdc3 *NAMESPACE
-ea2937e102ed03cceee16d176772802d *NEWS
+a5c47eb23bc05dabcdf9adc0a923c06c *DESCRIPTION
+1963cacb92c8f76f0865d00740449c43 *NAMESPACE
+0a7679340b7f7c973b81f3bf5b1c86c7 *NEWS
 7ecaff55c2ae98b77d24c4b6c7f7cf86 *R/MATCH.R
 3eebd5fe3394080789fedfea3a45e3ab *R/ORDER.R
 9015ff069b28219b6dc44505641d249c *R/Ops.zoo.R
 5c3f54c4c9d2692046b3b1049fc771f8 *R/aggregate.zoo.R
 65b001243ba9e0edf4c03e60bad35129 *R/as.Date.R
 93ff2d240541d0aa3588d410eb235699 *R/as.Date.ts.R
-a96668152049b188317455e7cdb61bd7 *R/as.zoo.R
+42d2549b937334f78b62e4fb98e7cfa7 *R/as.zoo.R
 62c1bf87a7380c654f17b1b8ed71efc6 *R/as.zoo.tis.R
 faaae6520bab57abe84eaa00ee3ad414 *R/barplot.zoo.R
 5af291cb99c193b4db3fc89ac9a59cff *R/coredata.R
-53d1efa0fe09fcd4e6e5d5cdced56502 *R/ggplot2.zoo.R
+ccb925c40b1398f7c427b934778d1b91 *R/ggplot2.zoo.R
 04a26dde3202887ef53a4b78a8e49830 *R/index.R
-e0b9e9a919725d282d7b4e608e42a364 *R/index2char.R
+4eb9cb572803b612e1735713d0d4fdce *R/index2char.R
 1d215aeb25acc0c75a6321f0522e2a76 *R/is.regular.R
 bdb3ac5e66c6b34351c21dba99ca4c51 *R/merge.zoo.R
 7564a94e7eb8117617e4433e69f0b50b *R/na.StructTS.R
 4e8c25337f2e1891e0939ebf2e6b0138 *R/na.aggregate.R
-85d12003737b84bf77301e05e87e5bc0 *R/na.approx.R
+824be88c3d276757f34bf4792223a4f6 *R/na.approx.R
 4ed0e2f08381ac59978b36893db30e5a *R/na.fill.R
 cd801f2e256a937016dfa229969ae118 *R/na.locf.R
 7682d00afdbff36fd903883d4df687a3 *R/na.spline.R
@@ -27,7 +27,7 @@ e1693ddba5cb8a6c55839564b02d80bd *R/na.trim.R
 03db77ea299410fa4c573e370ac2cc48 *R/read.zoo.R
 f961d86ef885dc7641d30380917b4919 *R/rollapply.R
 975b201ae4e5746503ac0fea981e4a4d *R/rollmean.R
-4ac2c5e2ce0c7d22b12ed1ffcd5a1b04 *R/window.zoo.R
+10144d674a64df659d315a3660b68210 *R/window.zoo.R
 f00456b37d08ed0da5cd43756e2cf4ea *R/xblocks.R
 e453aed85b5d4c2a69e8bda7a7fb2f0d *R/xyplot.zoo.R
 ec1d4ff4cfac5ffdfcededf4c876dd0f *R/yearmon.R
@@ -35,10 +35,10 @@ aa3d1814ac79cf44b8c5aa5223f8c3c5 *R/yearqtr.R
 0c2817c7040a2d175f2353c2a5342be6 *R/zoo.R
 6ce3a445569bd5081a41a2eeca68188e *R/zooreg.R
 2384093e877b896e17e0a4db2880d81a *R/zzz.R
-34de8b50fe7b4a2bd4d1625599fa3b9c *build/vignette.rds
+5dd549a8711e3614dcc034cf8950498f *build/vignette.rds
 beb8720082847566abaa78c65ee97815 *demo/00Index
 1c04abe2bd67fe9ba55d6e1ac3e73cab *demo/zoo-overplot.R
-1148328a784117c9ece85e67e7de3c9d *inst/CITATION
+46c8080b0ab7f4edc4b376cdd984329d *inst/CITATION
 21bede1b02820b648012773b5d3994fe *inst/THANKS
 bdc15aaa93d42a0e813dbca29806940a *inst/TODO
 e3acf3d51204abf03613d4db414a318d *inst/WISHLIST
@@ -48,19 +48,19 @@ a916af484ffa11d8aa8669404a25e53c *inst/doc/demo1.txt
 8ab6ae33767b9f99c8158192e12832c1 *inst/doc/sunw.rda
 e90680abb6a7cd9bd8de0e07667711b7 *inst/doc/zoo-design.R
 5051eb1d34cd0d183e2d84449912c9f8 *inst/doc/zoo-design.Rnw
-b1a915b3f49960f42d105ccf55541092 *inst/doc/zoo-design.pdf
+0178f6e9cc862e2fb8e34f2ef97fec4a *inst/doc/zoo-design.pdf
 f258743c6f42e2f350f04b0a5354fa8b *inst/doc/zoo-faq.R
 abeb6951c1dda54c9f394191dee37559 *inst/doc/zoo-faq.Rnw
-d7d48b7f805edf18d67db53e0c378a6b *inst/doc/zoo-faq.pdf
+670fac6e9b27643a69f290b8f9989734 *inst/doc/zoo-faq.pdf
 8d6f657051d84755ac8455ab71a16af1 *inst/doc/zoo-quickref.R
 7ff295aaa718852e5e251f350a5fc0ca *inst/doc/zoo-quickref.Rnw
-951c99cfe653112084b86c5deb63a0c6 *inst/doc/zoo-quickref.pdf
+d42fda16d1377b924073aa7b353e56bf *inst/doc/zoo-quickref.pdf
 7d6ae67bb66889b140f813a41de176ca *inst/doc/zoo-read.R
 fec411fafcf466d90674fec53e92ff4b *inst/doc/zoo-read.Rnw
-78647e88635385643d042ee0ff8b77cd *inst/doc/zoo-read.pdf
+cd62f7aa574bda5b3e3b296876dee79b *inst/doc/zoo-read.pdf
 429aa6375a73f63cf9fc2ce2e8acbbf5 *inst/doc/zoo.R
 4604fde9b40ab9b9c03c5cf6ba4a0939 *inst/doc/zoo.Rnw
-86a98694ff7e9c60e2c81d16fea12cf5 *inst/doc/zoo.pdf
+b90dc7ce40a04bf042b4bc6a6683156e *inst/doc/zoo.pdf
 dd2909911733f11d02837283e885402e *inst/include/zoo.h
 049de4bce6d54e1245d1f717d46aa214 *man/MATCH.Rd
 ce5614980ae640df7c8388f72de3a0ca *man/ORDER.Rd
@@ -68,7 +68,7 @@ bd9c7117b3bc57122236527f00764538 *man/aggregate.zoo.Rd
 9f4520c0da898b2c1015214ad0983a09 *man/as.zoo.Rd
 e4d5e73b04ea219a68758f5e418cf03d *man/coredata.Rd
 a91c3b70c28fc5e49376918e6f963781 *man/frequency.Rd
-980badf137220c75b960c11262510dbb *man/ggplot2.zoo.Rd
+5065376bc3450e37674ae5c4b78f6980 *man/ggplot2.zoo.Rd
 0ee53f3c9dd874f11810b2bf48cd2286 *man/index.Rd
 8cf1931a2b0bf69932742baa3888633f *man/is.regular.Rd
 c97b5855503b079c6bb4ec2e47764ede *man/lag.zoo.Rd
@@ -89,14 +89,14 @@ bc80d93adebdb275b6ebea39413a1c14 *man/window.zoo.Rd
 fa0c77d6ec2433b0a48a9f6b481b3180 *man/xyplot.zoo.Rd
 36fa499dcea3af90e38d99c0006a46ce *man/yearmon.Rd
 9f07c8b098764cf10678e2bcccc98afe *man/yearqtr.Rd
-386e7670256237cf3e3f0e601419df5c *man/zoo.Rd
+5b2bdbe8dafc1f4282c19bcc2e6715b0 *man/zoo.Rd
 58ee858545582658d9d7b4f7532b4e7e *man/zooreg.Rd
 3f03da795dd26373156bddc78d41e95d *src/Makevars
 3f03da795dd26373156bddc78d41e95d *src/Makevars.win
-d0497d676c87199bdef94f8f8a7c2dc5 *src/coredata.c
+132711221439cc019865622951f728f3 *src/coredata.c
 d80f53271535df8c5070377e897052cc *src/init.c
-28ea187973338c914a065d7bd1923133 *src/lag.c
-b8b5da61bf66a9c5a2c8fe3c8faea58b *tests/Examples/zoo-Ex.Rout.save
+91d77ccc8c5941e10405464bce66b4b0 *src/lag.c
+5b79779a1a8bde4653841ecdcbf5bea2 *tests/Examples/zoo-Ex.Rout.save
 cbea17222fe8d8f0846e1ec28ab2b987 *tests/as.Date.R
 1882571886517203f54502bc1f8b3fac *tests/as.Date.Rout.save
 3208e41199e2d233f5d1272f58d0fd9f *tests/bugfixes.R
diff --git a/NAMESPACE b/NAMESPACE
index 4d303a8..72aa984 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -304,7 +304,6 @@ if(getRversion() >= "3.6.0") {
   S3method("as.list", "yearmon")
   S3method("as.numeric", "yearmon")
   S3method("as.data.frame", "yearmon")
-  S3method("axis", "yearmon")
   S3method("c", "yearmon")
   S3method("cycle", "yearmon")
   S3method("diff", "yearmon")
@@ -334,7 +333,6 @@ if(getRversion() >= "3.6.0") {
   S3method("as.list", "yearqtr")
   S3method("as.numeric", "yearqtr")
   S3method("as.data.frame", "yearqtr")
-  S3method("axis", "yearqtr")
   S3method("c", "yearqtr")
   S3method("cycle", "yearqtr")
   S3method("diff", "yearqtr")
@@ -369,8 +367,9 @@ if(getRversion() >= "3.6.0") {
   S3method("coredata", "default")
   S3method("index", "default")
   S3method("index2char", "default")
-  S3method("is.regular", "default")
   S3method("index2char", "numeric")
+  S3method("index2char", "POSIXt")
+  S3method("is.regular", "default")
   S3method("na.approx", "default")
   S3method("na.fill", "default")
   S3method("na.locf", "default")
diff --git a/NEWS b/NEWS
index 01c476a..38a919c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,19 @@
+Changes in Version 1.8-12
+
+  o The autoplot() method for "zoo" objects now uses ggplot() directly rather
+    than the qplot() function which has been deprecated in recent versions of
+    ggplot2.
+
+  o Support start = NA and end = NA in addition to start = NULL and end = NULL
+    for unspecified start and end time of a window() of a zoo series.
+
+  o Remove unnecessary S3 method declarations for axis.yearmon/yearqtr as
+    axis() is no S3 generic, only Axis() is (reported by Kurt Hornik).
+
+  o The helper function index2char() now calls format() instead of as.character()
+    for objects inheriting from class POSIXt.
+
+
 Changes in Version 1.8-11
 
   o The as.ts() methods for both "zoo" and "zooreg" objects now allow to pass on
diff --git a/R/as.zoo.R b/R/as.zoo.R
index d1a8c99..0f5dc42 100644
--- a/R/as.zoo.R
+++ b/R/as.zoo.R
@@ -52,7 +52,7 @@ as.zoo.timeSeries <- function(x, ...) {
 
 as.zoo.xts <- function(x, ...) {
   y <- coredata(x)
-  if (length(y) == 0) {
+  if (is.null(dim(y)) && length(y) == 0) {
     y <- NULL
   }
   zoo(y, order.by = index(x), ...)
diff --git a/R/ggplot2.zoo.R b/R/ggplot2.zoo.R
index 4905ad1..86355fa 100644
--- a/R/ggplot2.zoo.R
+++ b/R/ggplot2.zoo.R
@@ -78,16 +78,20 @@ autoplot.zoo <- function(object, geom = "line", facets, ...)
     facets <- if(single) NULL else Series ~ .
   } else {
     auto <- FALSE
-  }  
+  }
 
+  ## process defaults as for old qplot-based interface
+  if(is.character(geom)) geom <- get(paste0("geom_", geom), asNamespace("ggplot2"))
+  if(inherits(facets, "formula")) facets <- ggplot2::facet_grid(facets)
+  
   ## "fake" variables for nonstandard evaluation
   Index <- Value <- Series <- NULL
-  
+
   ## call qplot
   gg <- if(single | (!is.null(facets) & auto)) {
-    ggplot2::qplot(Index, Value, data = df, geom = geom, facets = facets, ...) + ggplot2::ylab(if(single) levels(df$Series) else "") + ggplot2::xlab("Index")
+    ggplot2::ggplot(df, ggplot2::aes(x = Index, y = Value, ...)) + geom() + facets + ggplot2::ylab(if(single) levels(df$Series) else "") + ggplot2::xlab("Index")
   } else {
-    ggplot2::qplot(Index, Value, data = df, group = Series, geom = geom, facets = facets, colour = Series, ...) + ggplot2::ylab("") + ggplot2::xlab("Index")
+    ggplot2::ggplot(df, ggplot2::aes(x = Index, y = Value, group = Series, colour = Series, ...)) + geom() + facets + ggplot2::ylab("") + ggplot2::xlab("Index")    
   }
   return(gg)
 }
diff --git a/R/index2char.R b/R/index2char.R
index 4c5ee1e..b1a973c 100644
--- a/R/index2char.R
+++ b/R/index2char.R
@@ -2,6 +2,8 @@ index2char <- function(x, ...) UseMethod("index2char")
 
 index2char.default <- function(x, ...) as.character(x)
 
+index2char.POSIXt <- function(x, ...) format(x, ...)
+
 index2char.numeric <- function(x, frequency = NULL, digits = getOption("digits") - 3, ...)
 {
   freq <- frequency
diff --git a/R/na.approx.R b/R/na.approx.R
index ef3640b..d8ca3c7 100644
--- a/R/na.approx.R
+++ b/R/na.approx.R
@@ -25,7 +25,7 @@ na.approx.zoo <- function(object, x = index(object), xout, ..., na.rm = TRUE, ma
         }
         objectm <- merge(object.x, zoo(, xout))
         if (length(dim(objectm)) == 2) colnames(objectm) <- colnames(object)
-        result <- window(objectm, index = xout)
+        result <- window(objectm, index. = xout)
     }
     result[] <- na.approx.default(object, x = x, xout = xout, na.rm = FALSE, ..., maxgap = maxgap)
     if ((!missing(order.by) && !is.null(order.by)) || !missing.xout) {
diff --git a/R/window.zoo.R b/R/window.zoo.R
index 27c74f2..c626719 100644
--- a/R/window.zoo.R
+++ b/R/window.zoo.R
@@ -12,8 +12,8 @@ window.zoo <- function(x, index. = index(x), start = NULL, end = NULL, ...)
     end <- floor(end[1]*freq + (end[2] - 1) + .0001)/freq
   }
 
-  if(is.null(start)) {
-    if(is.null(end)) {
+  if(is.null(start) || any(is.na(start))) {
+    if(is.null(end) || any(is.na(end))) {
       wi <- which(MATCH(all.indexes, index., nomatch = 0) > 0)
       return(x[wi, , drop = FALSE])
     } else {
@@ -21,7 +21,7 @@ window.zoo <- function(x, index. = index(x), start = NULL, end = NULL, ...)
       return(x[wi, , drop = FALSE])
     }
   } else {
-    if(is.null(end)) {
+    if(is.null(end) || any(is.na(end))) {
       wi <- which(in.index & all.indexes >= start)
     } else {
       wi <- which(in.index & all.indexes >= start & all.indexes <= end)
@@ -44,8 +44,8 @@ window.zoo <- function(x, index. = index(x), start = NULL, end = NULL, ...)
     end <- floor(end[1]*freq + (end[2] - 1) + .0001)/freq
   }
   
-  if (!is.null(start)) index. <- index.[index. >= start]
-  if (!is.null(end)) index. <- index.[index. <= end]
+  if (!is.null(start) && !is.na(start)) index. <- index.[index. >= start]
+  if (!is.null(end) && !is.na(end)) index. <- index.[index. <= end]
 
   wi <- which(MATCH(ix, index., nomatch = 0) > 0)
   if (length(dim(x)) == 0)
diff --git a/build/vignette.rds b/build/vignette.rds
index 5d4f340e83ea840283897de05282a45e2a4df25d..bf2fd9d5def7696dd8b4d9d71dfab68e6fefa1f9 100644
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diff --git a/inst/CITATION b/inst/CITATION
index 1fe42aa..4d73617 100644
--- a/inst/CITATION
+++ b/inst/CITATION
@@ -1,19 +1,12 @@
-citHeader("To cite zoo in publications use:")
-
-citEntry(entry="Article",
-         title = "zoo: S3 Infrastructure for Regular and Irregular Time Series",
-         author = personList(as.person("Achim Zeileis"),
-	                     as.person("Gabor Grothendieck")),
-         journal      = "Journal of Statistical Software",
-         year         = "2005",
-	 volume       = "14",
-	 number       = "6",
-	 pages        = "1--27",
-         doi          = "10.18637/jss.v014.i06",
-         
-         textVersion = 
-         paste("Achim Zeileis and Gabor Grothendieck (2005).", 
-               "zoo: S3 Infrastructure for Regular and Irregular Time Series.",
-               "Journal of Statistical Software, 14(6), 1-27.",
-	       "doi:10.18637/jss.v014.i06")
+bibentry(bibtype = "Article",
+         title   = "zoo: S3 Infrastructure for Regular and Irregular Time Series",
+         author  = c(person(given = "Achim", family = "Zeileis"),
+                     person(given = "Gabor", family = "Grothendieck")),
+         journal = "Journal of Statistical Software",
+         year    = "2005",
+	 volume  = "14",
+	 number  = "6",
+	 pages   = "1--27",
+         doi     = "10.18637/jss.v014.i06",
+         header  = "To cite zoo in publications use:"
 )
diff --git a/inst/doc/zoo-design.pdf b/inst/doc/zoo-design.pdf
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diff --git a/inst/doc/zoo-quickref.pdf b/inst/doc/zoo-quickref.pdf
index 57a11f4589d6269dfc60f0df9f16b54373e10897..67624a23c76674370c0e7619f1a4e5092ec01c2f 100644
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diff --git a/inst/doc/zoo-read.pdf b/inst/doc/zoo-read.pdf
index 27acc42fe9e398b0fe8569e0bca2690f7dd3c6b7..a6f16cc6cf52fba66ece4a788a5a1739c3b203d1 100644
GIT binary patch
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diff --git a/inst/doc/zoo.pdf b/inst/doc/zoo.pdf
index c14f1fb1a68599ea82420b412f88a385e7b79275..ace34ec60fb882b834e6aeada86bebeea84dd5d7 100644
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diff --git a/man/ggplot2.zoo.Rd b/man/ggplot2.zoo.Rd
index 9f21ec9..5c2e1fb 100644
--- a/man/ggplot2.zoo.Rd
+++ b/man/ggplot2.zoo.Rd
@@ -39,13 +39,14 @@
 
 \arguments{
   \item{object}{an object of class \code{"zoo"}.}
-  \item{geom}{character specifying which \code{geom} to use
-    in \code{\link[ggplot2]{qplot}}.}
-  \item{facets}{specification of \code{facets} for \code{\link[ggplot2]{qplot}}. The
+  \item{geom}{character (e.g., \code{"line"}) or function (e.g., \code{\link[ggplot2]{geom_line}})
+    specifying which \code{geom} to use.}
+  \item{facets}{specification of \code{facets} for \code{\link[ggplot2]{facet_grid}}. The
     default in the \code{autoplot} method is to use \code{facets = NULL} for univariate
     series and \code{facets = Series ~ .} for multivariate series.}
-  \item{\dots}{further arguments passed to \code{\link[ggplot2]{qplot}}
-    for \code{autoplot} (and not used for \code{fortify}). For the \code{scale_*_*}
+  \item{\dots}{further arguments passed to \code{\link[ggplot2]{aes}}
+    for \code{autoplot} (e.g., \code{linetype = Series} and/or \code{shape = Series}).
+    For \code{fortify} the arguments are not used. For the \code{scale_*_*}
     functions the arguments are passed on to \code{scale_*_continuous}.}
   \item{model}{an object of class \code{"zoo"} to be converted to
     a \code{"data.frame"}.}
@@ -69,8 +70,7 @@
   \code{fortify.zoo} takes a zoo object and converts it into a data frame
   (intended for ggplot2). \code{autoplot.zoo} takes a zoo object and returns a
   ggplot2 object. It essentially uses the mapping \code{aes(x = Time, y = Value, group = Series)}
-  and adds \code{colour = Series}, \code{linetype = Series}, \code{shape = Series}
-  in the case of a multivariate series with \code{facets = NULL}.
+  and adds \code{colour = Series} in the case of a multivariate series with \code{facets = NULL}.
 }
 
 \value{
@@ -89,7 +89,7 @@
 }
 
 \seealso{
-  \code{\link[ggplot2]{autoplot}}, \code{\link[ggplot2]{fortify}}, \code{\link[ggplot2]{qplot}}
+  \code{\link[ggplot2]{autoplot}}, \code{\link[ggplot2]{fortify}}, \code{\link[ggplot2]{ggplot}}
 }
 
 \examples{
@@ -120,11 +120,10 @@ autoplot(z)                      ## multiple without color/linetype
 autoplot(z, facets = Series ~ .) ## multiple with series-dependent color/linetype
 autoplot(z, facets = NULL)       ## single with series-dependent color/linetype
 ## by hand with color/linetype and with/without facets
-qplot(x = Index, y = Value, group = Series, colour = Series,
-  linetype = Series, facets = Series ~ ., data = fortify(z, melt = TRUE)) +
-  geom_line() + xlab("Index") + ylab("")
-ggplot(aes(x = Index, y = Value, group = Series, colour = Series, linetype = Series),
+ggz <- ggplot(aes(x = Index, y = Value, group = Series, colour = Series, linetype = Series),
   data = fortify(z, melt = TRUE)) + geom_line() + xlab("Index") + ylab("")
+ggz
+ggz + facet_grid(Series ~ .)
 ## variations
 autoplot(z, geom = "point")
 autoplot(z, facets = NULL) + geom_point()
diff --git a/man/zoo.Rd b/man/zoo.Rd
index 31dfb47..6c7d2b1 100644
--- a/man/zoo.Rd
+++ b/man/zoo.Rd
@@ -40,6 +40,7 @@
 \alias{index2char}
 \alias{index2char.default}
 \alias{index2char.numeric}
+\alias{index2char.POSIXt}
 
 \alias{head.ts}
 \alias{tail.ts}
diff --git a/src/coredata.c b/src/coredata.c
index 5e04019..d5f2595 100644
--- a/src/coredata.c
+++ b/src/coredata.c
@@ -32,21 +32,21 @@ SEXP zoo_coredata (SEXP x, SEXP copyAttr)
      removing
   */
   SEXP result;
-  int i, j, ncs, nrs;
+  R_xlen_t i, j, ncs, nrs;
   int P=0;
-  PROTECT(result = allocVector(TYPEOF(x), length(x))); P++;
+  PROTECT(result = allocVector(TYPEOF(x), xlength(x))); P++;
   switch( TYPEOF(x)) {
     case REALSXP:
-      memcpy(REAL(result), REAL(x), length(result) * sizeof(double));
+      memcpy(REAL(result), REAL(x), xlength(result) * sizeof(double));
       break;
     case INTSXP:
-      memcpy(INTEGER(result), INTEGER(x), length(result) * sizeof(int));
+      memcpy(INTEGER(result), INTEGER(x), xlength(result) * sizeof(int));
       break;
     case LGLSXP:
-      memcpy(LOGICAL(result), LOGICAL(x), length(result) * sizeof(int));
+      memcpy(LOGICAL(result), LOGICAL(x), xlength(result) * sizeof(int));
       break;
     case CPLXSXP:
-      memcpy(COMPLEX(result), COMPLEX(x), length(result) * sizeof(Rcomplex));
+      memcpy(COMPLEX(result), COMPLEX(x), xlength(result) * sizeof(Rcomplex));
       break;
     case STRSXP:
       ncs = ncols(x); nrs = nrows(x);
@@ -55,7 +55,7 @@ SEXP zoo_coredata (SEXP x, SEXP copyAttr)
         SET_STRING_ELT(result, i+j*nrs, STRING_ELT(x, i+j*nrs));
       break;
     case RAWSXP:
-      memcpy(RAW(result), RAW(x), length(result) * sizeof(unsigned char));
+      memcpy(RAW(result), RAW(x), xlength(result) * sizeof(unsigned char));
       break;
     default:
       error("currently unsupported data type");
diff --git a/src/lag.c b/src/lag.c
index 67b4472..640593e 100644
--- a/src/lag.c
+++ b/src/lag.c
@@ -31,14 +31,14 @@ SEXP zoo_lag (SEXP x, SEXP _k, SEXP _pad)
 Rprintf("zoo_lag\n");
 #endif
   SEXP result;
-  int i,j;
+  R_xlen_t i,j;
   double *result_real=NULL;
   int    *result_int=NULL;
 
   int k=INTEGER(_k)[0] * -1; /* -1 is zoo convention */
   int k_positive = (k > 0) ? 1 : 0;
-  int nr = nrows(x);
-  int nc = ncols(x);
+  R_xlen_t nr = nrows(x);
+  R_xlen_t nc = ncols(x);
   int P=0;
   int PAD = INTEGER(coerceVector(_pad,INTSXP))[0];
 
@@ -49,11 +49,11 @@ Rprintf("zoo_lag\n");
     error("abs(k) must be less than nrow(x)");
 
   PROTECT(result = allocVector(TYPEOF(x), 
-          length(x) - (PAD ? 0 : abs(k)*nc))); P++;
+          xlength(x) - (PAD ? 0 : abs(k)*nc))); P++;
 
-  int nrr;
-  if(length(result) > 0)
-    nrr = (int)(length(result)/nc);
+  R_xlen_t nrr;
+  if(xlength(result) > 0)
+    nrr = (R_xlen_t)(xlength(result)/nc);
   else  /* handle zero-length objects */
     nrr = nr - (PAD ? 0 : abs(k));
 
diff --git a/tests/Examples/zoo-Ex.Rout.save b/tests/Examples/zoo-Ex.Rout.save
index 7364f85..a15a433 100644
--- a/tests/Examples/zoo-Ex.Rout.save
+++ b/tests/Examples/zoo-Ex.Rout.save
@@ -1,5 +1,5 @@
 
-R version 4.2.1 (2022-06-23) -- "Funny-Looking Kid"
+R version 4.2.2 Patched (2022-11-10 r83330) -- "Innocent and Trusting"
 Copyright (C) 2022 The R Foundation for Statistical Computing
 Platform: x86_64-pc-linux-gnu (64-bit)
 
@@ -514,11 +514,10 @@ Frequency = 3
 + autoplot(z, facets = Series ~ .) ## multiple with series-dependent color/linetype
 + autoplot(z, facets = NULL)       ## single with series-dependent color/linetype
 + ## by hand with color/linetype and with/without facets
-+ qplot(x = Index, y = Value, group = Series, colour = Series,
-+   linetype = Series, facets = Series ~ ., data = fortify(z, melt = TRUE)) +
-+   geom_line() + xlab("Index") + ylab("")
-+ ggplot(aes(x = Index, y = Value, group = Series, colour = Series, linetype = Series),
++ ggz <- ggplot(aes(x = Index, y = Value, group = Series, colour = Series, linetype = Series),
 +   data = fortify(z, melt = TRUE)) + geom_line() + xlab("Index") + ylab("")
++ ggz
++ ggz + facet_grid(Series ~ .)
 + ## variations
 + autoplot(z, geom = "point")
 + autoplot(z, facets = NULL) + geom_point()
@@ -2943,7 +2942,7 @@ Feb 2000  NA   6
 > ###   na.contiguous.list na.contiguous.default na.contiguous.zoo scale.zoo
 > ###   xtfrm.zoo names.zoo names<-.zoo quantile.zoo rev.zoo transform.zoo
 > ###   ifelse.zoo dim<-.zoo index2char index2char.default index2char.numeric
-> ###   head.ts tail.ts
+> ###   index2char.POSIXt head.ts tail.ts
 > ### Keywords: ts
 > 
 > ### ** Examples
@@ -3263,7 +3262,7 @@ NA  1  2  3 NA  6
 > cleanEx()
 > options(digits = 7L)
 > base::cat("Time elapsed: ", proc.time() - base::get("ptime", pos = 'CheckExEnv'),"\n")
-Time elapsed:  1.953 0.048 2.009 0 0 
+Time elapsed:  1.909 0.039 1.948 0 0 
 > grDevices::dev.off()
 null device 
           1