[R] help with r package "trip"

[Jim Lemon]

Hi Alice,
Have you tried creating a vector of the start position (xpos[1],ypos[1]):

xstart<-rep(xpos[1],n)
ystart<-rep(ypos[1],n)
# where "n" is the number of subsequent positions in the trip
max(trackDistance(xstart,ystart,xpos[2:n],ypos[2:n],...))

may then give you the value of the longest distance from the start. I
don't have the trip package or I could see if you really need to
replicate the start positions.

JIm


On Wed, Jun 15, 2016 at 1:43 PM, Alice Domalik <adomalik at sfu.ca> wrote:
> Hi List,
>
> I'm relatively new to R, so apologies if my question is rather elementary.
> I'm working with some bird tracking data and I would like to calculate the maximum distance traveled from the colony.
> For the maximum distance traveled, I was going to use the function homedist(). However, when I try to use this function I get the following error:
> Error: could not find function "homedist"
> Anyone know why I would get this error? I have been using other functions in "trip" without an issue. Is there an alternative way I can calculate this?
>
> Thanks in advance for any help!
>
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