[R] how to eliminate first row in datafile created in do loop

[Ian Gow]

Gregory: Would setting limit.list <- NULL at the start do the trick? See
example below:

Analogue of your example:

lower <- 0
upper <- 0
limit.list<-data.frame(lower,upper)
for(i in 1:12) {
    some.data <- rnorm(2)
   lower <- min(some.data)
  upper <- max(some.data)
  one.month <- data.frame(lower, upper)
  limit.list <- rbind(limit.list, one.month)
}
limit.list

Approach that doesn't give zeroes at the start:

limit.list <- NULL
for(i in 1:12) {
    some.data <- rnorm(2)
  lower <- min(some.data)
  upper <- max(some.data)
  one.month <- data.frame(lower, upper)
  limit.list <- rbind(limit.list, one.month)
}
limit.list


-Ian

On 5/24/11 7:30 AM, "Graves, Gregory" <ggraves at sfwmd.gov> wrote:

>I am trying to create a routine that would take a time series and
>generate monthly 25%tile and 75%tile limits based on 12 calendar months.
>I have succeeded to create a do loop to do this, but can't figure out
>how to initiate the receiving datafile (in this case "limit.list")
>without sticking an initial set of zeroes in.  I'd like to be able to
>insert a new column "i.value" for each time "i" increments 1 thru 12, to
>represent the 12 months, but I can't figure out how to join the value of
>i to the "lower" and "upper" variables.  Close but no cigar here.
>
>lower=0
>upper=0
>limit.list<-data.frame(lower,upper)
>for(i in 1:12){
>	s=subset(paleo,month==i);
>        one.month=with(s, quantile(WBpaleo, c(.25, .75), na.rm=T));
>        limit.list<-rbind(limit.list,one.month)
>}
>limit.list
>
>which gives me this:
>> limit.list
>      lower    upper
>1   0.00000  0.00000
>2  25.51786 29.68823
>3  26.09828 30.92770
>4  27.75703 33.04016
>5  29.53395 36.14273
>6  30.89420 37.65727
>7  29.27843 37.59690
>8  27.50141 34.36265
>9  26.40554 32.88533
>10 25.13494 29.83829
>11 23.48982 27.14612
>12 22.88814 27.52782
>13 24.51789 28.24871
>
>How do I avoid having row 1 in my list?
>
>I can delete the first row with:
>limit.list = limit.list[-1,]
>
>but that messes up my month variable
>
>> limit.list
>      lower    upper
>2  25.51786 29.68823
>3  26.09828 30.92770
>4  27.75703 33.04016
>5  29.53395 36.14273
>6  30.89420 37.65727
>7  29.27843 37.59690
>8  27.50141 34.36265
>9  26.40554 32.88533
>10 25.13494 29.83829
>11 23.48982 27.14612
>12 22.88814 27.52782
>13 24.51789 28.24871
>
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