Release CHANGES IN knitr VERSION 1.5 · yihui/knitr

NEW FEATURES

a new option value results='hold' to flush all text output to the end of a chunk like fig.show='hold' (thanks, Harlan Harris, #593)
when cache is enabled, automatic chunk dependencies can be truly automatic now; there is no need to call dep_auto() explicitly, and all we need to do is the chunk option autodep=TRUE; the chunk dependencies will be rebuilt after each chunk, so when new chunks are inserted into the document, knitr can also figure out the new dependencies automatically (thanks, @knokknok, #592)
for Sublime Text users, there is a SublimeKnitr package to support LaTeX and Markdown with knitr; thanks, Andrew Heiss (#449) (this is not really a new feature of knitr itself, though)
now the chunk options warning and message can also take numeric values as indices to select which warnings/messages to include in the output (thanks, Simon Urbanek, #590)

code changes in chunks should invalidate the cache when the chunk option cache < 3; fixed by @knokknok in #587
fixed the bug reported at http://stackoverflow.com/q/18302179/559676; before evaluating inline R code, the chunk options eval must be evaluated to a logical value
fixed the bug reported at http://stackoverflow.com/q/18544045/559676; read_chunk() no longer excludes code without chunk headers, so stitch() will include all the code as expected
fixed the bug reported under http://stackoverflow.com/a/18541083/559676; now \ensuremath{} can be correctly applied to numbers of the form 10^{-n}
fixes a regression bug reported by Graham Williams: https://groups.google.com/forum/#!topic/knitr/_I5rlo9tOeA the global chunk options set in child documents are no longer restored
fixed #604: kable() did not work on data frames/matrices of one row (thanks, Kevin Ushey)
fixes the bug reported at http://stackoverflow.com/q/18992260/559676; render_jekyll('prettify') should have pasted the source code lines into one character string

when the chunk option cache=2, the recorded plots (i.e. display lists) will no longer be cached, and the figure files will be assumed to exist the next time the document is compiled, otherwise the cache will be purged and the chunk needs to be recomputed; this will save some disk space and avoid bugs like #588 (thanks, @knokknok)

the Rnw chunk syntax is more tolerant on chunk headers in the sense that any characters after <<>>= are discarded, e.g. <<echo=TRUE>>===foo will be treated as <<echo=TRUE>>= (thanks, Michael Friendly)
knitr:::.onLoad() no longer modifies the PATH variable when /usr/texbin is not in PATH under Mac OS
when a message/warning/error contains line breaks, they are preserved and the message will not be re-wrapped (#602, thanks, Tyler Rinker)
read_chunk() tolerates white spaces in the end of the chunk headers now (suggested by John Maindonald, #606)
for R HTML documents, only the highlight component in opts_knit$get('header') was used in previous versions; now all components except framed and tikz are used; this makes it possible to further customize the HTML header (thanks, Wahlen Neuwirth and Erich Neuwirth)
in previous versions, the global option KNITR_WIDTH in R was used to set options(width); now this option is set from opts_knit$get('width'), which has the same default value 75 (#597)