[R] Help transforming a dist

[Sarah Goslee]

On Fri, Dec 23, 2011 at 1:06 AM, Taral <taralx at gmail.com> wrote:
> Perfect! combn was the trick I needed. Although I'll probably rbind
> the stuff instead of building a new frame. :)

You should try rbind() with the small example I gave before you use it
on your data. You'll immediately see why I didn't. :)

> On Thu, Dec 22, 2011 at 6:48 PM, Sarah Goslee <sarah.goslee at gmail.com> wrote:
>> I'm not at all sure what you mean with your matrix: is that supposed to
>> be three columns? What about:
>>
>>> fakedata <- data.frame(X=runif(3), Y = runif(3))
>>> rownames(fakedata) <- c("A", "B", "C")
>>> dist(fakedata)
>>          A         B
>> B 0.8617733
>> C 0.3813032 0.5124284
>>> data.frame(t(combn(rownames(fakedata), 2)), dist=as.vector(dist(fakedata)))
>>  X1 X2      dist
>> 1  A  B 0.8617733
>> 2  A  C 0.3813032
>> 3  B  C 0.5124284
>>
>> Sarah
>>
>> On Thu, Dec 22, 2011 at 7:03 PM, Taral <taralx at gmail.com> wrote:
>>> I'd like to convert a dist into a table/matrix/thingy of the form:
>>>
>>> A B value
>>> A C value
>>> B C value
>>>
>>> (assuming the dist was over 3 names).
>>>
>>> Is there a way to do this without using a for loop?
>>>