On 06/04/2011 4:02 PM, Walter Anderson wrote:
   I have cobbled together the following logic.  It works but is very
slow.  I'm sure that there must be a better r-specific way to implement
this kind of thing, but have been unable to find/understand one.  Any
help would be appreciated.

hh.sub<- households[c("HOUSEID","HHFAMINC")]
for (indx in 1:length(hh.sub$HOUSEID)) {
    if ((hh.sub$HHFAMINC[indx] == '01') | (hh.sub$HHFAMINC[indx] == '02')
| (hh.sub$HHFAMINC[indx] == '03') | (hh.sub$HHFAMINC[indx] == '04') |
(hh.sub$HHFAMINC[indx] == '05'))
      hh.sub$CS_FAMINC[indx]<- 1 # Less than $25,000

The answer is to think in terms of vectors and logical indexing. The code above is equivalent to

hh.sub$CS_FAMINC[ hh.sub$HHFAMINC %in% c('01', '02', '03', '04', '05') ] <- 1

I've left off the rest of the loop, but I think it's similar.

Duncan Murdoch

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