Re: [R] Case statements in R

From: Ted Harding <Ted.Harding_at_manchester.ac.uk>
Date: Mon, 28 Jul 2008 19:21:25 +0100 (BST)


On 28-Jul-08 17:52:31, Henrik Bengtsson wrote: > Use '&' for vectors and '&&' for scalars. Ditto applies to the OR > operator(s). /Henrik

What's wrong with using "&" for scalars? Surely it gives the correct answer? Maybe it's simply a bit slower, or something?

Ted.

> On Mon, Jul 28, 2008 at 10:36 AM, Wade Wall <wade.wall_at_gmail.com>
> wrote:

>> Hi all,
>>
>> I am trying to convert geometric means in a matrix to cover classes.
>> My
>> values are as such:
>>
>> perc<-c(0,0.025136418, 0.316227766, 1.414213562,3.16227766,
>> 7.071067812,
>> 15.8113883, 35.35533906, 61.23724357, 84.40971508, 97.46794345)
>> cover<-c(0,1,2,3,4,5,6,7,8,9,10)
>>
>> This is what I am trying to accomplish
>>
>> veg_mean[veg_mean>0 && veg_mean < .1] <- 1
>> veg_mean[veg_mean>= .1 && veg_mean < 1.0] <- 2
>> veg_mean[veg_mean>=1.0 && veg_mean < 2.0] <- 3
>> veg_mean[veg_mean>=2.0 && veg_mean < 5.0] <- 4
>> veg_mean[veg_mean>= 5.0 && veg_mean < 10.0] <- 5
>> veg_mean[veg_mean>= 10.0 && veg_mean < 25] <- 6
>> veg_mean[veg_mean>= 25.0 && veg_mean < 50.0] <- 7
>> veg_mean[veg_mean>=50.0 && veg_mean < 75.0] <- 8
>> veg_mean[veg_mean>= 75.0 && veg_mean < 95.0 ] <- 9
>> veg_mean[veg_mean>= 95.0 && veg_mean <= 100] <- 10
>> veg_mean[veg_mean> 100] <- NA
>>
>> where values are assigned based on the geometric means. However, I
>> think
>> that my syntax for the && operator is wrong and I can't find a
>> reference to
>> proper syntax. I basically want to "bin" the geometric means.
>>
>> Any help would be greatly appreciated.
>>
>> Thanks,
>>
>> Wade
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help_at_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.
>>
> 
> ______________________________________________
> R-help_at_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.

--------------------------------------------------------------------
E-Mail: (Ted Harding) <Ted.Harding_at_manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861
Date: 28-Jul-08                                       Time: 19:21:08
------------------------------ XFMail ------------------------------

______________________________________________
R-help_at_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. Received on Mon 28 Jul 2008 - 18:57:44 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Sat 02 Aug 2008 - 09:32:59 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive