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Changelog

Source: NEWS.md

reshape2 1.4.5

CRAN release: 2025-11-12

  • No longer uses non-API entry points (@kevinushey, #106).
  • Other various fixes for R CMD check issues.

reshape2 1.4.4

CRAN release: 2020-04-09

  • Fix R CMD check failure in R-devel.

Version 1.4.3

CRAN release: 2017-12-11

  • Fix C/C++ problems causing R CMD CHECK errors.

  • melt.data.frame() throws when encountering objects of type POSIXlt, and requests a conversion to the (much saner) POSIXct type.

Version 1.4.2

CRAN release: 2016-10-22

  • Minor R CMD check fixes for CRAN.

Version 1.4.1

CRAN release: 2014-12-06

  • melt.data.frame() now properly sets the OBJECT bit on value variable generated if attributes are copied (for example, when multiple POSIXct columns are concatenated to generate the value variable) (#50)

  • melt.data.frame() can melt data.frames containing list elements as id columns. (#49)

  • melt.data.frame() no longer errors when measure.vars is NULL or empty. (#46)

Version 1.4

CRAN release: 2014-04-23

  • dcast() and acast() gain a useful error message if you use value_var intead of value.var (#16), and if value.var doesn’t exist (#9). They also work better with . in specifications like . ~ . or x + y ~ .

  • melt.array() creates factor variables with levels in the same order as the original rownames (#19)

  • melt.data.frame() gains an internal Rcpp / C++ implementation, and is now many orders of magnitudes faster. It also preserves identical attributes for measure variables, and now throws a warning if they are dropped. (Thanks to Kevin Ushey)

  • melt.data.frame() gains a factorsAsStrings argument that controls whether factors are converted to character when melted as measure variables. This is TRUE by default for backward compatibility.

  • melt.array() gains a as.is argument which can be used to prevent dimnames being converted with type.convert()

  • recast() now returns a data frame instead of a list (#45).

Version 1.2.2

CRAN release: 2012-12-04

  • Fix incompatibility with plyr 1.8

  • Fix evaluation bug revealed by knitr. (Fixes #18)

  • Fixed a bug in melt where it didn’t automatically get variable names when used with tables. (Thanks to Winston Chang)

Version 1.2.1

CRAN release: 2012-01-10

  • Fix bug in multiple margins revealed by plyr 1.7, but caused by mis-use of data frame subsetting.

Version 1.2

CRAN release: 2011-11-18

  • Fixed bug in melt where factors were converted to integers, instead of to characters

  • When the measured variable is a factor, dcast now converts it to a character rather than throwing an error. acast still returns a factor matrix. (Thanks to Brian Diggs.)

  • acast is now much faster, due to fixing a very slow way of naming the output. (Thanks to José Bartolomei Díaz for the bug report)

  • value_var argument to acast and dcast renamed to value.var to be consistent with other argument names

  • Order NA factor levels before (all) when creating margins

  • Corrected reshape citation.

Version 1.1

CRAN release: 2011-01-04

  • melt.data.frame no longer turns characters into factors

  • All melt methods gain a na.rm and value.name arguments - these previously were only possessed by melt.data.frame (Fixes #5)