Problem with spTransform() function

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proj4string(SP) = CRS("+proj=utm +zone=23+south +datum=WGS84
+units=m +no_defs") ## Proje

maybe try:

proj4string(SP) = CRS("+proj=utm +zone=23 +south +datum=WGS84 +units=m
+no_defs")

- -- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of M?nster
Heisenbergstra?e 2, 48149 M?nster, Germany. Phone: +49 251
83 33081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de
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