[knitr] Chunk Reference: How to reuse chunks | /knitr/demo/reference/

访客 *Xiasw0601* @ 2012-04-21 02:40:50 写道：

LyX下如何使用read_chunk()？我尝试着用Rnw同样设置，无法工作！

Guest *Joshua Wiley* @ 2012-05-14 18:21:22 originally posted:

 Is there anyway to use chunk references to create a nonlinear page?  The specific example I have in mind is that I would like to show all the packages used to create a page at the very top.  I load packages throughout the page as they are needed.  If I run sessionInfo() at the very end, it has all the output that I want, however, I would like that output at the beginning.

Guest *ADPowers* @ 2012-11-30 00:28:22 originally posted:

I really like this in principal, since R code blocks can be substantial (especially when creating intricate plots), which means one should be able to inoculate the cumbersome code, then simply make reference to it in the actual document (think say a dedicated 'Plots' .rnw), my question though is.

If I am using tikz device to put a plot directly into the document, there is a problem with the sequencing. Example below creates the plot in the first code block, with the results being printed in the second.

%CHUNK NUMBER 1
<<demo,eval=true,echo=false,external=false,results='hide',dev='tikz'>>=
set.seed(1213) # for reproducibility
x <- cumsum(rnorm(100))
x
mean(x) # mean of x
hist(x) # Histogram
@

%CHUNK NUMBER 2
<<demo,echo=false,results='markup'>>=
@

Which prevents the inoculation concept from being effective. The intended result (in this trivial example) is to have the printed data followed by the plot, whereas, what is happening here, is the plot is being printed in the first block, and not in the second. The data is being suppressed in the first, then marked up in the second.

If the first block was held in a separate .RNW file along with all the other plotting chunks, the issue would become crystal clear, since all of the plots would be printed and grouped together at one incorrect location, with the related data scattered through the document as instructed.

Any ideas?

Guest *ADPowers* @ 2012-11-30 05:51:02 originally posted:

put a run_chunk('c') after x = 2

Guest *David Forrest* @ 2014-08-03 14:50:39 originally posted:

Cool --- You can use a vector of multiple chunk references in ref.label like ref.label=c('libraries',setup',helpers'...)

Guest *Januz* @ 2014-12-11 22:39:43 originally posted:

Can I reference chunks from another Rmarkdown file? I'd like to do all my preliminary analyses in a Rmarkdown file and then reference the important bits in the final report/paper... Thanks!