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

[Graves, Gregory]

Certainly closer, and I can get by with this ... but ... would like to
not have the "one.month"s .

limit.list<-NULL
for(i in 1:12){
	s=subset(paleo,month==i);
        one.month=with(s, quantile(WBpaleo, c(.25, .75), na.rm=T));
        one.month=c(as.character(i),one.month);
        limit.list<-rbind(limit.list,one.month)  
}

> limit.list
               25%             75%            
one.month "1"  "25.51786389"   "29.68823492"  
one.month "2"  "26.09827974"   "30.9276985"   
one.month "3"  "27.757034405"  "33.040163045" 
one.month "4"  "29.53395155"   "36.1427293975"
one.month "5"  "30.894195075"  "37.657271835" 
one.month "6"  "29.27843098"   "37.59689852"  
one.month "7"  "27.5014142975" "34.36265367"  
one.month "8"  "26.4055425"    "32.88533117"  
one.month "9"  "25.1349430375" "29.838291435" 
one.month "10" "23.48982439"   "27.14611846"  
one.month "11" "22.88814497"   "27.52782293"  
one.month "12" "24.5178851225" "28.248711925"


-----Original Message-----
From: Ian Gow [mailto:iandgow at gmail.com] 
Sent: Tuesday, May 24, 2011 8:58 AM
To: Graves, Gregory; Nungesser, Martha; r-help at r-project.org
Cc: Kemp, Susan K SAJ; patrick_pitts at fws.gov
Subject: Re: [R] how to eliminate first row in datafile created in do
loop

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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