A update to the sp package, version 0.9-61 has been released on CRAN and will propagate to mirrors soon. Versions 0.9-56 through 0.9-60 can be installed on R < 2.9.1 but fail when functions calling anyDuplicated() (spChFIDs() or any function calling Polygons()) are used. The problem only affects users of R < 2.9.1 and sp between 0.9-56 and 0.9-60. Users of R < 2.9.1 should revert to 0.9-52, or upgrade R if this problem affects you. The new version now correctly depends on versions of R >= 2.9.1 that provide anyDuplicated(). Roger
Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Helleveien 30, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 e-mail: Roger.Bivand at nhh.no