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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