[R] Difference across the Nth dimension of an array

I have a multidimensional array - in this case with 4 dimensions of x,y,z and time. I'd like to take the time derivative of this matrix, i.e. perform the diff operator along dimension number 4. In Matlab, there is a simple option to specify which dimension the difference is to be taken across.,

Re: [R] Difference across the Nth dimension of an array

On 9 January 2012 08:53, Phil Wiles philip.wi...@gmail.com wrote: I have a multidimensional array - in this case with 4 dimensions of x,y,z and time.  I'd like to take the time derivative of this matrix, i.e. perform the diff operator along dimension number 4. apply can do that, but you may