Thanks to everyone. Joshua's response seemed the most concise one, but it
used up so much memory that my R just gave error. I checked the other
replies and all in all I came up with this, and thought to share it with
others and get comments.
My structure was as follows:
ACCOUNT RULE DATE
A1
David Winsemius dwinsem...@comcast.net
on Fri, 24 Dec 2010 11:47:05 -0500 writes:
On Dec 24, 2010, at 11:04 AM, David Winsemius wrote:
On Dec 24, 2010, at 8:45 AM, Ali Salekfard wrote:
Hi all,
I'm new to the list but have benfited from it quite
On Dec 29, 2010, at 9:24 AM, Ali Salekfard wrote:
Thanks to everyone. Joshua's response seemed the most concise one,
but it
used up so much memory that my R just gave error. I checked the other
replies and all in all I came up with this, and thought to share it
with
others and get
On Dec 29, 2010, at 11:03 AM, Ali Salekfard wrote:
David,
Thanks alot. Your code is worked fine on the whole dataset (no
memory error as I had with the other ideas). I do like the style -
especialy the fact that it is all in one line - , but for large
datasets it takes longer than
David,
Thanks alot. Your code is worked fine on the whole dataset (no memory error
as I had with the other ideas). I do like the style - especialy the fact
that it is all in one line - , but for large datasets it takes longer than
what I wrote. I ran it on the same machine with the same set of
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Ali Salekfard
Sent: Wednesday, December 29, 2010 6:25 AM
To: r-help@r-project.org
Subject: Re: [R] Removing rows with earlier dates
Thanks to everyone. Joshua's response
Hi all,
I'm new to the list but have benfited from it quite extensively. Straight to
my rather strange question:
I have a data frame that contains mapping rules in this way:
ACCOUNT, RULE COLUMNS, Effective Date
The dataframe comes from a database that stores all dates. What I would like
to
On Dec 24, 2010, at 8:45 AM, Ali Salekfard wrote:
Hi all,
I'm new to the list but have benfited from it quite extensively.
Straight to
my rather strange question:
I have a data frame that contains mapping rules in this way:
ACCOUNT, RULE COLUMNS, Effective Date
The dataframe comes from
On Dec 24, 2010, at 11:04 AM, David Winsemius wrote:
On Dec 24, 2010, at 8:45 AM, Ali Salekfard wrote:
Hi all,
I'm new to the list but have benfited from it quite extensively.
Straight to
my rather strange question:
I have a data frame that contains mapping rules in this way:
ACCOUNT,
Hi,
On Fri, Dec 24, 2010 at 5:45 AM, Ali Salekfard salekf...@googlemail.com wrote:
[snip]
I have a data frame that contains mapping rules in this way:
ACCOUNT, RULE COLUMNS, Effective Date
The dataframe comes from a database that stores all dates. What I would like
to do is to create a
-Original Message-
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Ali Salekfard
Sent: Friday, December 24, 2010 5:46 AM
To: r-help@r-project.org
Subject: [R] Removing rows with earlier dates
Hi all,
I'm new to the list but have benfited
with(YourDataFrame, tapply(`Effective Date`, `RULE COLUMNS`,
function(x) x[which.max(x)]))
David pointed out that this will just return a table of dates. One
work around is:
do.call(rbind, by(DataFrame, DataFrame[, RULE COLUMNS],
function(x) x[which.max(x[, Effective Date]), ]))
but that
Whenever a task calls for breaking a data object into pieces, operate on the
pieces, then put it back together, then think about using the plyr package.
Sent from my iPod
On Dec 24, 2010, at 6:58 AM, Ali Salekfard salekf...@googlemail.com wrote:
Hi all,
I'm new to the list but have
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