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Dear friends, I have a (20*30) matrix,and want to get a subset of it like the following: The original matrix: rows:1,2,3,....20; columns:1,2,3,....30 I want to get my subset of The original matrix and delete others: rows:1,3,5,7,...19; columns:1,3,5.....29 -- Kind Regards,Zhi Jie,Zhang ,PHDDepartment of EpidemiologySchool of Public HealthFudan UniversityTel:86-21-54237149 [[alternative HTML version deleted]]

...hat the steps maybe: 1.decompose coords into the original x and y; 2.select the odd numbers of x and y; 3.combine the selected x and y into coordinates, including the corresponding z-values. This is the subset. Hope someone can solve it. I failed to get the subset. -- Kind Regards,Zhi Jie,Zhang ,PHDDepartment of EpidemiologySchool of Public HealthFudan UniversityTel:86-21-54237149 [[alternative HTML version deleted]]

...specific Special Interest Group (=: SIG) mailing lists,and i'm interested in the"R-sig-Geo :R Special Interest Group on using Geographical data and Mapping ",but can't find how to join it, could anybody tell me how to do that? thank u very much! -- Kind Regards,Zhi Jie,Zhang ,PHDDepartment of EpidemiologySchool of Public HealthFudan UniversityTel:86-21-54237149

...oup for y with the controlled x. First, i want to use analysis of covariance in SAS, but i found that y isn't noramal and can't become normal through transformation. Under that condition, what should i do using R / SAS? Any suggestions are great appreciate! -- Kind Regards,Zhi Jie,Zhang ,PHDDepartment of EpidemiologySchool of Public HealthFudan UniversityTel:86-21-54237149