search for: dxdi

I'm using Kernel Utilization distributions to estimate overlap in animal territories. There are various ways to calculate this overlap and one of the equations is : V.I. = ??? min (f1 (x,y,z), f2 (x,y,z)) dxdy where f1 = utilization distribution for bird 1 in 3 spatial dimensions (x,y,z). I can produce these already, but no idea how to do the rest. Thoughts? -- View this message in

Hi, I posted this message earlier in "Rmetrics" and I don't know whether I posted in the wrong place, so I'm posting it again in Rhelp. I have a function in x and y and let's call it f(x,y). I need to get the Hessian matrix. i.e I need (d^2f/dx^2), (d^2f/dxdy), (d^2f/dydx), (d^2f/dy^2).I can get these using the D function. now I need to evaluste the hessian matrix for

Does anyone know an alternate way of calculating R2n with spatial data other than converting values into ltraj format (adehabitat package)? I have a series of geographic xy coordinates (in metres). I imagine I can subtract x1y1 from x2y2 to get the spatial difference (dxdy), but what function can I use to calculate R2n (i.e. net squared displacement) using this information? Tyler -- View