Joris,
I want to add a line in a function with a print "warning" if one element of
the column is <>0.
I could use if(sum(u$POSITION)<>0) as a condition, but I can imagine having
one element equal to -2, and another one to 2. So in this case, sum=0, but
the condition is false in fact (minimum of o
Arnaud,
check the vector :
> u$POSITION<>0
[1] TRUE TRUE ...
what I do is putting u$POSITION==0
[1] FALSE FALSE ...
when you apply the sum() function on that vector, FALSE becomes 0 and TRUE
becomes 1. So this actually gives you a way of counting the amount of
positions that are not zero. if you
Oops, forgot to give a subject
> -Original Message-
> From: arnaud Gaboury [mailto:arnaud.gabo...@gmail.com]
> Sent: Wednesday, May 26, 2010 2:31 PM
> To: r-help@r-project.org
> Cc: 'arnaud Gaboury'
> Subject:
>
> Dear group,
>
> Here is my data frame:
>
> > dput(u)
> structure(list(DE
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