Made various updates in advance of the v19 release. Most are to appease

the CRAN gods.  For now, I've replaced currently defunct Pajek URLs with
Internet Archive equivalents; this will hopefully work for at least
the medium term.  I also fixed a bug in which a bad value of edge.check
was passed by some constructors to add.edge/add.edges.  This did not
actually produce a problem under normal circumstances (which is why it
was not caught), but more stringent checking implemented by the CRAN
folks flagged it.  add.edge(s) now validates that argument more carefully,
defaulting as usual to FALSE.

ChangeLog

@@ -1,4 +1,11 @@
 CHANGELOG:
+v1.19.0
+  - Non-visible and documentation changes for CRAN compliance.
+  - Internal argument handling changes; should generally be invisible, but
+    may in some complex cases avoid problems when calling network().
+  - Bolstered add.edge and add.edges against improper edge.check arguments.
+  - Made get.inducedSubgraph() and permute.vertexIDs() generic.
+  - Replaced now non-functional Pajek URLs with Internet Archive versions.
 v1.18.2
   - Non-visible changes for CRAN compliance.
 v1.18.1

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: network
 Version: 1.19.0
-Date: 2023-12-04
+Date: 2024-12-04
 Title: Classes for Relational Data
 Authors@R: c(
     person("Carter T.", "Butts", role=c("aut","cre"), email="buttsc@uci.edu"),

R/access.R

@@ -6,7 +6,7 @@
 # David Hunter <dhunter@stat.psu.edu> and Mark S. Handcock
 # <handcock@u.washington.edu>.
 #
-# Last Modified 06/06/21
+# Last Modified 12/04/24
 # Licensed under the GNU General Public License version 2 (June, 1991)
 # or greater
 #
@@ -152,6 +152,8 @@ add.edge.network<-function(x, tail, head, names.eval=NULL, vals.eval=NULL, edge.
   if(.validLHS(xn,parent.frame())){  #If x not anonymous, set in calling env 
     on.exit(eval.parent(call('<-',xn,x)))
   }
+  if(is.null(edge.check)||(length(edge.check)<1)||is.na(edge.check[1]))
+    edge.check<-FALSE
   x<-.Call(addEdge_R,x,tail,head,names.eval,vals.eval,edge.check)
   invisible(x)
 }
@@ -185,7 +187,7 @@ add.edges.network<-function(x, tail, head, names.eval=NULL, vals.eval=NULL, ...)
   if(length(unique(c(length(tail),length(head),length(names.eval), length(vals.eval))))>1)
     stop("head, tail, names.eval and vals.eval lists passed to add.edges must be of the same length!\n")
   edge.check<-list(...)$edge.check
-  if(is.null(edge.check))
+  if(is.null(edge.check)||(length(edge.check)<1)||is.na(edge.check[1]))
     edge.check<-FALSE
   #Pass the inputs to the C side
   xn<-substitute(x)

R/fileio.R

@@ -126,13 +126,13 @@
 #' @seealso \code{\link{network}}
 #' @references Batagelj, Vladimir and Mrvar, Andrej (2011) Pajek Reference
 #' Manual version 2.05
-#' \url{http://vlado.fmf.uni-lj.si/pub/networks/pajek/doc/pajekman.pdf} Section
+#' \url{http://web.archive.org/web/20240906013709/http://vlado.fmf.uni-lj.si/pub/networks/pajek/doc/pajekman.pdf} Section
 #' 5.3 pp 73-79
 #' 
 #' Batageli, Vladimir (2008) "Network Analysis Description of Networks"
-#' \url{http://vlado.fmf.uni-lj.si/pub/networks/doc/ECPR/08/ECPR01.pdf}
+#' \url{http://web.archive.org/web/20240511173536/http://vlado.fmf.uni-lj.si/pub/networks/doc/ECPR/08/ECPR01.pdf}
 #' 
-#' Pajek Datasets \url{http://vlado.fmf.uni-lj.si/pub/networks/data/esna/}
+#' Pajek Datasets \url{http://web.archive.org/web/20240411203537/http://vlado.fmf.uni-lj.si/pub/networks/data/esna}
 #' @keywords datasets
 #' @examples
 #'