RNG changes

update solve section


git-svn-id: https://svn.r-project.org/R-dev-web/trunk@1256 c52295ea-58df-0310-926a-d16021944841

Author: ripley

170update.txt

@@ -55,6 +55,11 @@ only distinction between the class given by data.class() and that
 given by class() and used for dispatch by UseMethod is that
 data.class() reports "numeric" for integer vectors.)
 
+[If you want code to be compatible with < 1.7.0 versions of R, use
+
+	 if(is.null(attr(x, "class"))) attr(x, "class") <- data.class(x)
+
+]
 
 Unless the package makes use of setMethod (methods), loading can be
 speeded up by having an object called .noGenerics (with any value) in
@@ -77,12 +82,15 @@ documentation is in `Writing R Extensions'.
 Other changes
 -------------
 
+The default random number generators have been changed.
+
+
 solve.default() now uses LAPACK by default, and works as documented,
-on square matrices `a'.  Some packages have been using it for QR
-decompositions (which was documented in S but not in R: use qr.solve)
-or even for length-1 vectors (just divide).  QR decompositions are
-accepted with a warning.  One package was using it for over-determined
-rectangular systems: use qr() and qr.solve() for those.
+on _square matrices_ `a'.  Some packages have been using it for QR
+decompositions (which was documented in S but not in R: use solve()
+but not solve.default()) or even for length-1 vectors (just divide).
+One package was using it for over-determined rectangular systems: use
+qr() and qr.solve() for those.
 
 
 Packages should not execute code with side effects in their .R files.
@@ -91,13 +99,15 @@ files, please move them to .First.lib.  This is necessary for the
 experiments with saving objects in databases, a feature planned for
 1.8.x.
 
+
 A full double-precision LAPACK library Rlapack.{so,sl,dll,dynlib} is
 installed with R, unless a high-performance LAPACK library was found
 at configure time.  If your package makes use of LAPACK, please
 convert it to use this via
 
       $(LAPACK_LIBS) $(BLAS_LIBS)
 
-in PKG_LIBS.
+in PKG_LIBS in Makevars.
+