Displaying 2 results from an estimated 2 matches for "fm__employees__muel".
2003 Nov 19
1
RMySQL_5.2 SuSE9.0
Hi,
i try to install, but getting no success.
What this mean cannot find -lz , any necessary
lib left in my SuSE Installation?
Many thanks, Christian
linux:/usr/lib/R/bin # R CMD INSTALL RMySQL_0.5-2.tar.gz
* Installing *source* package 'RMySQL' ...
creating cache ./config.cache
checking how to run the C preprocessor... cc -E
checking for mysql_init in -lmysqlclient... yes
checking
2003 Nov 12
4
column extraction by name ?
I have a data frame (df) with colums x, y and z.
e.g. df <- data.frame(x = sample(4), y = sample(4), z = sample(4))
I can extract column z by: df$z or df[3]
I can also extract columns x,y by: df[1:2] or by df[-3].
Is it possible to extract x,y columns in a "symbolic" fashion i.e.
by equivalent of df[-z] (which is illegal) ???
Or alternativeley, is there an equivalent of