Displaying 3 results from an estimated 3 matches for "justinnabbl".
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justinnabble
2010 Jan 12
3
How to get minimum value by group
I'd like to get a long data set of minimum values from groups in another data
set.
The following almost does what I want. (Note, I'm using the word factor
differently from it's meaning in R; bad choice of words)
myframe = data.frame(factor1 = rep(1:2,each=8), factor2 =
rep(c("a","b"),each=4, times=2), factor3 = rep(c("x","y"),each=2, times=4),
2010 Mar 26
2
Odd results with %% and conserving memory
Can anyone explain this?
I have a matrix with double components. It's taking up a lot of memory, so I
want to multiply then turn it to integers. I'm pretty certain that there are
only 2 decimal places, but I wanted to check by using modulo. E.g.
mat = matrix(11:50/100, ncol=4,nrow=10) #Matrix with values out to the
hundredths
any((mat * 100)%%1!=0)
But oddly enough it doesn't work.
2009 Oct 11
1
How do you test if a number is in a list of numbers?
Hi,
I want to subset a data frame if one of the variables matches any in a list.
I could of course do something like this:
subset(dataset, var == 1 | var == 2 | var ==3)
but that's tedious.
I tried
varlist = c(1,2,3,4)
subset(dataset, any(var == varlist))
but it doesn't work because 'any' doesn't go row-by-row and hence always
returns TRUE.
Is there any simple way to do this?