Hello
On 30 Aug 2007, at 16:08, willem vervoort wrote:
>
> What happens when you raise a negative value to a power and the result
> is a very large number?
>
[snip]
> I loaded package Brobdingnag and tried:
> as.brob(x^B)
> [1] NAexp(NaN) NAexp(NaN) NAexp(NaN) NAexp(NaN) NAexp(NaN)
>> as.
Thanks for all the points. Riding my bike back home I realised that
the fractional power was a problem. I also forgot about the operator
precedence:
> b <- 48.3
> -53.1^b
[1] -2.099256e+83
> (-53.1)^b
[1] NaN
Pretty clear now. Back to my maths than...
> version
# sorry forgot this last time
On 8/30/2007 12:11 PM, Martin Becker wrote:
> willem vervoort wrote:
>> Dear all,
>> I am struggling to understand this.
>>
>> What happens when you raise a negative value to a power and the result
>> is a very large number?
>>
>> B
>> [1] 47.73092
>>
>>
>>> -51^B
>>>
>> [1] -3.190824e+81
On Thu, 30 Aug 2007, willem vervoort wrote:
> Dear all,
> I am struggling to understand this.
>
> What happens when you raise a negative value to a power and the result
> is a very large number?
Where are the 'very large numbers' here? R can cope with much larger
numbers (over 10^300).
> B
> [
willem vervoort wrote:
> Dear all,
> I am struggling to understand this.
>
> What happens when you raise a negative value to a power and the result
> is a very large number?
>
> B
> [1] 47.73092
>
>
>> -51^B
>>
> [1] -3.190824e+81
>
> # seems fine
>
Well, this seems not to be what you
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of willem vervoort
> Sent: Thursday, August 30, 2007 8:09 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] Behaviour of very large numbers
>
> Dear all,
> I am struggling to
On 8/30/07, Gustaf Rydevik <[EMAIL PROTECTED]> wrote:
> On 8/30/07, willem vervoort <[EMAIL PROTECTED]> wrote:
> > Dear all,
> > I am struggling to understand this.
> >
> > What happens when you raise a negative value to a power and the result
> > is a very large number?
> >
> > B
> > [1] 47.73092
On 8/30/2007 11:08 AM, willem vervoort wrote:
> Dear all,
> I am struggling to understand this.
>
> What happens when you raise a negative value to a power and the result
> is a very large number?
>
> B
> [1] 47.73092
>
>> -51^B
> [1] -3.190824e+81
You should be using parentheses. You evaluat
Hello,
it seems to be an R bug. It gives strange errors for non-integer exponents:
> version
platform i686-redhat-linux-gnu
version.string R version 2.4.1 (2006-12-18)
> x^47.0
[1] -1.802180e+80 -1.768932e+80 -1.736284e+80 -1.704227e+80
-1.672748e+80 [...]
> x^47.10
[1] NaN NaN NaN NaN
Dear all,
I am struggling to understand this.
What happens when you raise a negative value to a power and the result
is a very large number?
B
[1] 47.73092
> -51^B
[1] -3.190824e+81
# seems fine
# now this:
> x <- seq(-51,-49,length=100)
> x^B
[1] NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN
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