On Nov 16, 2009, at 1:38 PM, baptiste auguie wrote:
Hi,
Try this,
set.seed(2) # reproducible
d = matrix(sample(1:20,20), 4, 5)
d
d[ d[ ,2] == 18 , ]
You may need to test with all.equal if your values are subject to
rounding errors.
HTH,
baptiste
2009/11/16 frenchcr <frenc...@btinternet.com>:
I have 20 columns of data, and in column 5 I have a value of 17600
but I
dont know which row this value is in (i have over 300,000 rows).
I'm trying to do 2 things:
1) I want to find out which row in column 5 has this number in it.
Using baptiste's setup:
> which(d[, 2]==18)
[1] 4
2) Then I want to print out that row with all the column headers so
i can
look at the other parameters in the row that are associated with
this value.
How do i do it?
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David Winsemius, MD
Heritage Laboratories
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