Improvements for concordances.

git-svn-id: https://svn.r-project.org/R/trunk@88958 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: hornik

src/library/tools/R/Rconcordance.R

@@ -130,7 +130,7 @@ matchConcordance <- function(linenum, concordance) {
 ## 3.  Optionally, the starting line number of the output coded as "ofs nn",
 ##     where nn is the offset to the first output line.  This is omitted if nn is 0.
 ## 4.  The input line numbers corresponding to each output line.
-##     This are compressed using the following simple scheme:
+##     These are compressed using the following simple scheme:
 ##     The first line number, followed by
 ##     a run-length encoded diff of the rest of the line numbers.
 

src/library/tools/man/matchConcordance.Rd

@@ -113,6 +113,19 @@ Concordance strings are produced by the \code{"Rconcordance"} method of
 they are simply character vectors encoding the concordance data.
 The default method of the \code{as.concordance} generic function 
 converts them to \code{"Rconcordance"} objects.
+
+Concordance strings have three or four parts, separated by colons:
+\enumerate{
+  \item The target filename.
+  \item The source filename.
+  \item Optionally, the starting line number of the target coded as
+  \code{ofs \var{nn}} where \var{nn} is the offset to the first target
+  line.  This is omitted if \var{nn} is 0.
+  \item The source line numbers corresponding to each target line.
+  These are compressed using the following simple scheme: the first line
+  number, followed by a run-length encoded diff of the rest of the line 
+  numbers.
+}
 }
 \value{
 \code{matchConcordance} returns a character array with one row