I hope I am not telling you things you already know. If so, I apologize
in advance.
There are several C-library addons available to try to deal with the
problem that comparisons of floating point numbers can be
unpredictable. I think your example with the greater than sign would
not be a sour
On Mon, 15 Dec 2003 [EMAIL PROTECTED] wrote:
> On 15-Dec-03 Thomas Lumley wrote:
> >
> > One reason that which.max() exists is that we cannot guarantee
> > which(x==max(x)) to work. It is possible, though rather unlikely, for
> > there to be no x such that x==max(x). One reason is the unpredictab
On 15-Dec-03 Thomas Lumley wrote:
>
> One reason that which.max() exists is that we cannot guarantee
> which(x==max(x)) to work. It is possible, though rather unlikely, for
> there to be no x such that x==max(x). One reason is the unpredictable
> use of 10-byte wide floating point registers on In
On Sat, 13 Dec 2003 [EMAIL PROTECTED] wrote:
> On 13-Dec-03 Martin Maechler wrote:
> > In general, use
> >
> > == for testing equality of integer numbers (of type "integer"
> >or not)
>
> I hope this is not a suggestion to avoid usage like
>
> which(x == max(x))
>
> when x is
In that particular case there is also
which.max(x)
---
Date: Sat, 13 Dec 2003 13:31:42 - (GMT)
From: <[EMAIL PROTECTED]>
To: Martin Maechler <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Subject: Re: [R] Basic question on function "identical"
On 13-
On 13-Dec-03 Martin Maechler wrote:
> In general, use
>
> == for testing equality of integer numbers (of type "integer"
>or not)
I hope this is not a suggestion to avoid usage like
which(x == max(x))
when x is a vector of reals? (i.e. should be OK when you know that
the th
> "TL" == Thomas Lumley <[EMAIL PROTECTED]>
> on Fri, 12 Dec 2003 14:54:51 -0800 (PST) writes:
TL> On Fri, 12 Dec 2003, John Welsh wrote:
>>
>>
>> > for(i in c(1:5)) + { + print(identical(i,1)) + }
>>
>> [1] FALSE [1] FALSE [1] FALSE [1] FALSE [1] FALSE
>
One is an integer and the other is not. Try
for (i in 1:5) print( identical( i, as.integer(1) ) )
---
Date: Fri, 12 Dec 2003 14:47:07 -0800
From: John Welsh <[EMAIL PROTECTED]>
To: '[EMAIL PROTECTED]' <[EMAIL PROTECTED]>
Subject: [R] Basic question on function "id
On Fri, 12 Dec 2003, John Welsh wrote:
>
>
> > for(i in c(1:5))
> + {
> + print(identical(i,1))
> + }
>
> [1] FALSE
> [1] FALSE
> [1] FALSE
> [1] FALSE
> [1] FALSE
>
> Why don't I get:
>
> [1] TRUE
> [1] FALSE
> [1] FALSE
> [1] FALSE
> [1] FALSE
>
Because the first element of 1:5 is an integer an
> for(i in c(1:5))
+ {
+ print(identical(i,1))
+ }
[1] FALSE
[1] FALSE
[1] FALSE
[1] FALSE
[1] FALSE
Why don't I get:
[1] TRUE
[1] FALSE
[1] FALSE
[1] FALSE
[1] FALSE
John Welsh
Associate Professor
Sidney Kimmel Cancer Center
10835 Altman Row
San Diego, CA 92121
(858) 450-5990 ex.282
[EMAIL
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