Charilaos Skiadas ha scritto:
> On May 9, 2008, at 5:39 AM, Dieter Menne wrote:
>
> If I understand the OP's question properly, the first value is to be a
> multiple of 50, the second a multiple of 5, and the third a multiple
> of 1. This can be done with this slight variation on the above theme:
>
> a <- c(1803.02, 193.51, 3.47)
> b <- c(50,5,1)
> round(a/b) *b
This is exactly was I was looking for, and you understand it properly.
Sorry for the double post, but I'm experiencing problems with my account
in this list
>
>> This is not exactly what you want, but it shows that the problem is a
>> bit
>> ill-defined. In the example you gave, why do you want 1800, and not
>> 1805, which
>> is possible with the pipettes? I assume that you laboratory
>> experience is
>> working in the background, telling you to stop pipetmanning when you
>> are close
>> to the result in some "percentage" feeling.
>>
>> Dieter
No, even if there's a lab background working behind, I'm only
transferring some experience with spreadsheets to R.
I want (actually "the pipette wants") 1800 instead that 1805 since the
larger volumes are to be delivered with a digital pipette whose step is 50.
Thanks to all the people who contributed. This list is always a great
source.
8rino
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