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Dear R experts, I am currently facing a tricky problem which I have read a lot about in the various R mailing lists without finding exactly what I need. I have a big data frame DF (about 2,000,000 rows) with 7 columns being variables and 1 being a measure (using reshape package nomeclature). There are no "duplicates" in it. Fot each of the variables I have some "rules" to apply, being COD_IN the value of the variable in the DF, COD_OUT the one to be transformed to; once obtained the "new codes" in the DF I have to aggregate the "new DF" (for...

On 09/06/2016 08:57 PM, Jerry Geis wrote: > I was searching tonight how to update OLD systems. > I have C5 and C6 systems that need updating and they are remote systems. > ... > Is this a valid option for updating C5 and C6 to take them to C7? First, a bit of nomeclature clarification is in order. To me, and to most in the RHEL-derived world, an 'update' means staying within the major release that you already have but bringing the packages up-to-date. This is easily done with 'yum update' on CentOS 5 and 6 systems, which are both still suppor...

I was searching tonight how to update OLD systems. I have C5 and C6 systems that need updating and they are remote systems. I followed the paths and ended up at DNF. Is this a valid option for updating C5 and C6 to take them to C7? Thanks, Jerry

I want to take the first row of each unique ID value from a data frame. For instance > ddTable <- data.frame(Id=c(1,1,2,2),name=c("Paul","Joe","Bob","Larry")) I want a dataset that is Id Name 1 Paul 2 Bob > unique(ddTable) Will give me all 4 rows, and > unique(ddTable$Id) Will give me c(1,2), but not accompanied by the name column.