[R] Range across a List

[Ravi S. Shankar]

To add more clarity to my question

My data pp2 is a list 

 (pp2[[1]])
      RIC Trade.Date Close.Price Currency.Code Convertion.Rate New.Price
ABCD.SZ   2008/02/29       15.30           CNY          0.1408
2.154240
ABCD.SZ   2008/01/31       15.27           CNY          0.1392
2.040048
ABCD.SZ   2007/11/30       11.07           CNY          0.1357
1.502199
ABCD.SZ   2007/10/31       10.89           CNY          0.1340
1.459260
ABCD.SZ   2007/09/28       12.77           CNY          0.1334
1.703518

 (pp2[[2]])
RIC      Trade.Date   Close.Price Currency.Code Convertion.Rate
New.Price
PQRS.SZ   2008/02/29        9.27           CNY         0.1408   1.305216
PQRS.SZ   2008/01/31        8.07           CNY         0.1392   1.123344
PQRS.SZ   2007/12/31        8.76           CNY         0.1371   1.200996
PQRS.SZ   2007/11/30        6.43           CNY         0.1357   0.872551
PQRS.SZ   2007/10/31        6.80           CNY         0.1340   0.911200
PQRS.SZ   2007/09/28        7.94           CNY         0.1334   1.059196

And so on till (pp2[[1244]])

Each of pp2[[i]] is a data frame. For each date I need to find the range
of New.Price across the list
i.e.for 2008/02/29   it would be
max(pp2[[i]]$New.Price[1])-min(pp2[[i]]$New.Price[1]) where i ranges
from 1 to 1244

Thank you,
Ravi

 
 
 

-----Original Message-----
From: markleeds at verizon.net [mailto:markleeds at verizon.net] 
Sent: Thursday, March 27, 2008 2:12 AM
To: Ravi S. Shankar
Subject: Re: [R] Range across a List

>From: "Ravi S. Shankar" <ravis at ambaresearch.com>
>Date: 2008/03/26 Wed PM 03:28:52 CDT
>To: r-help at stat.math.ethz.ch
>Subject: [R] Range across a List

i think it's a dataframe ( it looks
like one )  or convert it to
one if it's not and then I think below should
work.

temp<-lapply(split(pp2,pp2$Trade.Date), function(.df)
{
  data.frame(.df$Trade.Date[1],range(.df$New.Price))
})

result<-do.call(rbind,temp)

test it though because i didn't.


>Hi R,
>I have a list
>> class(pp2)
>[1] "list"
> 
>> length(pp2)
>[1] 1244
>
>It is in the below format
>      RIC Trade.Date Close.Price Currency.Code Convertion.Rate
New.Price
>ABCD.SZ   2008/02/29       15.30        CNY          0.1408  2.154240
>ABCD.SZ   2008/01/31       15.27        CNY          0.1392  2.125584
>ABCD.SZ   2007/12/31       14.88        CNY          0.1371  2.040048
>ABCD.SZ   2007/11/30       11.07        CNY          0.1357  1.502199
>ABCD.SZ   2007/10/31       10.89        CNY          0.1340  1.459260
>ABCD.SZ   2007/09/28       12.77        CNY          0.1334  1.703518
>
>I want to find the range of pp2$New.Price for length(pp2) for each date
>Any help would be appreciated
>
>Thanks in advance
>Ravi
>
>
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