我已将R升级到版本3.2.2.当我重新启动Rstudio时,在显示">"之前,会出现一条错误消息:
Error in tools:::httpdPort <= 0L :
comparison (4) is possible only for atomic and list types
这是什么意思？我该怎么做才能删除此邮件？
echo $PATH 给我
/Library/Frameworks/Python.framework/Versions/3.4/bin:/Applications/Sublime Text 2.app/Contents/SharedSupport/bin:/Users/pathreskoo/anaconda/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/opt/local/bin:/opt/local/sbin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/opt/X11/bin:/usr/local/git/bin
但是当我想改变/usr/local/bin前面的顺序时/Library/Frameworks/Python.framework/Versions/3.4/bin,我输入
sudo emacs /etc/paths
我只能得到
/usr/local/bin:
/usr/bin:
/bin:
/usr/sbin:
/sbin:
我怎么能插/usr/local/bin在我面前PATH？
df1 <- data.frame(name = c("A","B","C"), f1 = c(1,2,3), f2 = c("zz","mo","do"))
df2 <- data.frame(name = c("D","B","C"), f1 = c(1,4,6), f2 = c("ok","no","do"))
df3 <- data.frame(name = c("D","E","C"), f1 = c(1,2,3), f2 = c("so","yo","kl"))
我想将它们合并到一个数据框中,以便它看起来像
name df.1f1 df1.f2 df2.f1 df2.f2 df3.f1 df3.f2
A 1 zz na na na na
B 2 mo 4 no na na
C 3 do 6 do 3 kl
D na na 1 ok 1 so
E na na na na 2 yo
虽然我可以使用重复的dplyr :: full_join来做到这一点,但它太繁琐了.谁有更好的方法来做到这一点？