02 2015 档案

统计建模与R软件习题二答案
摘要：# 习题2# 2.1x=c(1,2,3)y=c(4,5,6)e=c(rep(1,3))z=2*x+y+e;zx%*%y # 若x，y如答案那样定义为矩阵，则不能用%*%,因为，维数不对应，x%o%y # 答案x<-matrix(1:3,nrow=3)y<-matrix(4:6,nrow=3)e<-m... 阅读全文
posted @ 2015-02-28 17:25 monlh 阅读(1285) 评论(0) 推荐(0)
R for installing package 'omg'
摘要：The time i have tried to install the package named 'PODBC' and it worked.But now i meet a problem with package named 'pmg' again.> install.packages('p... 阅读全文
posted @ 2015-02-09 13:51 monlh 阅读(195) 评论(0) 推荐(0)
R: for installing package 'RODBC'
摘要：Today, i try to install a package in R named 'DOBDC', while i meet a message:> install.packages('RODBC')package ‘RODBC’ is available as a source packa... 阅读全文
posted @ 2015-02-09 12:51 monlh 阅读(2196) 评论(0) 推荐(0)