[R] Simple loop code

[RCulloch]

Hi fellow R Users,

I find that I typically rewrite my data specific to data in columns, which
is by no means efficient and I am struggling to break out of this bad habit
and utalise some of the excellent things R can do! I have tried to look at
'for' but I don't really follow it, and I wondered if anyone could help with
a simple example using my script so I could follow this and build on it, so
for example, wanting to change an ID code from alphanumeric to numeric. The
example below works, but takes ages, given I have a lot of IDs, to do
manually! 

Any thoughts on how to create a loop to go through each ID and give them a
unique number would be most welcome!

Cheers,

Ross


levels(dat.ID$ID2)[levels(dat.ID$ID2)=='A1']<-1
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='A2']<-2
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='D1']<-3
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='D2']<-4
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='D4']<-5
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='D5']<-6
levels(dat.ID$ID2)[levels(dat.ID$ID2)=='D6']<-7
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