(Ted Harding) wrote:
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?
A good reason to use '&&' rather than '&' is if evaluating
whatever is on the right will create an error if what is on
the left is FALSE. '&&' and '||' stop if they already know
the answer from seeing the left side. So they are likely faster
by a few nanoseconds, but it's the ability to stop before you
go off a cliff that is probably the key feature.
Patrick Burns
[EMAIL PROTECTED]
+44 (0)20 8525 0696
http://www.burns-stat.com
(home of S Poetry and "A Guide for the Unwilling S User")
Ted.
On Mon, Jul 28, 2008 at 10:36 AM, Wade Wall <[EMAIL PROTECTED]>
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
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E-Mail: (Ted Harding) <[EMAIL PROTECTED]>
Fax-to-email: +44 (0)870 094 0861
Date: 28-Jul-08 Time: 19:21:08
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