IRD;
There is a danger in applying logical tests of equality to floating
point numbers. It may be safer to use all.equal or zapsmall in the
construction of your tests.
> all.equal( (2^(0.5))^2 , 2)
[1] TRUE
> (2^(0.5))^2 == 2
[1] FALSE
--
David.
On Oct 16, 2010, at 1:30 PM, Joshua Wiley wrote:
Dear IRD,
One way is to select every row except those where y = y.j and then
assign that to IR. In my example, which() returns a vector of the row
numbers where the condition evaluated TRUE, then I used `-` to select
not those rows.
IR <- IR[-which(IR$y == y.j), ]
HTH,
Josh
On Sat, Oct 16, 2010 at 5:02 AM, IRD <ird_u...@hotmail.com> wrote:
Dear All
I have data like this:
IR
x y
[1,] 5 2.865490
[2,] 3 1.454611
[3,] 3 2.258772
[4,] 6 1.476128
[5,] 4 2.771606
y.j
y
2.865490
and I want to delete data row in IR where y = y.j
How I can do.
IRD
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and provide commented, minimal, self-contained, reproducible code.
--
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
