R help - Nov 2010 - longer object length is not a multiple of shorter object length

Hi folks,

I'm following An Introduction to R
http://cran.r-project.org/doc/manuals/R-intro.html#R-and-statistics

to learn R.

Coming to;
2.2 Vector arithmetic
> v <- 2*x + y + 1
Warning message:
In 2 * x + y :
  longer object length is not a multiple of shorter object length

What does it mean?  How to rectify it?  Please help.  TIA

B.R.
Stephen L

On Nov 3, 2010, at 11:00 AM, Stephen Liu wrote:
> Hi folks,
>
> I'm following An Introduction to R
> http://cran.r-project.org/doc/manuals/R-intro.html#R-and-statistics
>
> to learn R.
>
> Coming to;
> 2.2 Vector arithmetic
>
>> v <- 2*x + y + 1
> Warning message:
> In 2 * x + y :
>  longer object length is not a multiple of shorter object length
>
> What does it mean?  How to rectify it?  Please help.  TIA
What does this return:

c(length(x), length(y))  # ?



David Winsemius, MD
West Hartford, CT

----- Original Message ----

From: David Winsemius <dwinsemius at comcast.net>
To: Stephen Liu <satimis at yahoo.com>
Cc: r-help at r-project.org
Sent: Wed, November 3, 2010 11:03:18 PM
Subject: Re: [R] longer object length is not a multiple of shorter object length

- snip -
>> v <- 2*x + y + 1
>> Warning message:
>> In 2 * x + y :
>>  longer object length is not a multiple of shorter object length
>>
>> What does it mean?  How to rectify it?  Please help.  TIA
> What does this return:
> c(length(x), length(y))  # ?
c(length(x), length(y))
[1]  5 11


B.R.
Stephen L

On Nov 3, 2010, at 11:17 AM, Stephen Liu wrote:
> ----- Original Message ----
>
> From: David Winsemius <dwinsemius at comcast.net>
> To: Stephen Liu <satimis at yahoo.com>
> Cc: r-help at r-project.org
> Sent: Wed, November 3, 2010 11:03:18 PM
> Subject: Re: [R] longer object length is not a multiple of shorter  
> object length
>
> - snip -
>
>>> v <- 2*x + y + 1
>>> Warning message:
>>> In 2 * x + y :
>>> longer object length is not a multiple of shorter object length
>>>
>>> What does it mean?  How to rectify it?
You were not supposed to rectify it. That example was designed to show  
you what happens in R when two vectors (actually three) are offered to  
the Arithmetic operators. Read the material that is above and below  
that expression again.

>>> Please help.  TIA
>
>> What does this return:
>
>> c(length(x), length(y))  # ?
>
> c(length(x), length(y))
> [1]  5 11
>
>
> B.R.
> Stephen L
>
>
David Winsemius, MD
West Hartford, CT