On 29/01/2010 2:34 PM, Michael Friendly wrote:
[Env: Win Xp]
Is there any options() setting or call to help() or help.start() that
will allow me to view a help file for
a package built under R 2.10.x under R 2.9.2?
I'm using both R 2.9.2 and R 2.10.1, but prefer the former because the
CHM help is so much easier
to use. Yet, if I install a package built for R 2.10.x, I can't find
*any* way to display a help file in this
package.
For example, after library(TeachinDemos),
> ?HWidentify
Error in print.help_files_with_topic(x) :
No text help for 'HWidentify' is available:
corresponding file is missing
In addition: Warning message:
In
print.help_files_with_topic("C:/R/R-2.9.2/library/TeachingDemos/chm/HWidentify")
:
No CHM help for 'HWidentify' in package 'TeachingDemos' is available:
the CHM file for the package is missing
So, I try
> help.start()
updating HTML package listing
updating HTML search index
If nothing happens, you should open 'C:\R\R-2.9.2\doc\html\index.html'
yourself
I can then get to
file:///C:/R/R-2.9.2/library/TeachingDemos/html/00Index.html
but then all the links there give Not Found, e.g.,
file:///C:/R/R-2.9.2/library/TeachingDemos/html/HWidentify.html
and, indeed, C:\R\R-2.9.2\library\TeachingDemos\html contains
only 00Index.html.
All the links therein are to .html files in the same directory, so of course
are wrong.
The CHM help files were built at package install time. Binary packages
are images of already-installed packages, so they won't have CHM files
unless installed in 2.9.x or earlier.
So you "just" need to get the package source, and install it into the
earlier R. Sometimes this is easy, sometimes not.
Duncan Murdoch
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