So if I want to concatenate the output of multiple seq calls, there's no clear
way to to do this?
For background, I have a number of data.frames with the same structure in a
list. I want to 'collapse' the list into a single data.frame but only keeping
certain columns from each underlying data.frame. In my example below, I want to
keep columns 2,3 in each underlying data.frame.
I'm using do.call('cbind', my.list) and then using the statement below to
extract only the columns I need (other details omitted for brevity). If there's
a built-in or pre-built function to do this, I'm all eyes.
Brian
PS if this is unclear, flame away, and I'll post some code
-----Original Message-----
From: Peter Dalgaard [mailto:p.dalga...@biostat.ku.dk]
Sent: Friday, May 22, 2009 6:20 AM
To: Rowe, Brian Lee Yung (Portfolio Analytics)
Cc: r-help@r-project.org
Subject: Re: [R] Behavior of seq with vector from
Rowe, Brian Lee Yung (Portfolio Analytics) wrote:
....
> To get the value I want, I am using the following code:
>> sort(as.vector(apply(array(c(2,3)), 1, seq, by=3,length.out=4)))
> [1] 2 3 5 6 8 9 11 12
>
> So two questions:
> 1. Is seq designed/intended to be used with a vector from argument, and
> is this the desired behavior?
> 2. If so, is there a cleaner way of implementing what I want?
1. Hmm, not really. NA.
2. I'd view it as an outer sum, stringed out to a single vector, hence:
> c(outer(c(2,3), seq(0,,3,4), "+"))
[1] 2 3 5 6 8 9 11 12
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
--------------------------------------------------------------------------
This message w/attachments (message) may be privileged, confidential or
proprietary, and if you are not an intended recipient, please notify the
sender, do not use or share it and delete it. Unless specifically indicated,
this message is not an offer to sell or a solicitation of any investment
products or other financial product or service, an official confirmation of any
transaction, or an official statement of Merrill Lynch. Subject to applicable
law, Merrill Lynch may monitor, review and retain e-communications (EC)
traveling through its networks/systems. The laws of the country of each
sender/recipient may impact the handling of EC, and EC may be archived,
supervised and produced in countries other than the country in which you are
located. This message cannot be guaranteed to be secure or error-free.
References to "Merrill Lynch" are references to any company in the Merrill
Lynch & Co., Inc. group of companies, which are wholly-owned by Bank of America
Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are
Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a
Condition to Any Banking Service or Activity * Are Not Insured by Any Federal
Government Agency. Attachments that are part of this E-communication may have
additional important disclosures and disclaimers, which you should read. This
message is subject to terms available at the following link:
http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you
consent to the foregoing.
--------------------------------------------------------------------------
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
