Thanks for the pointers. I have played with Incanter a little but the vector of vectors seems a good option.
Cheers, Simon On 22 déc, 09:08, Brian Hurt <bhur...@gmail.com> wrote: > If I wasn't using Incanter (see Alex Robbin's reply), I'd probably just use > a vector of vectors. If your matricies 70% dense, it's generally not worth > it to try and use some sort of sparse data structure- the extra overhead of > the sparse data structure will be greater than the savings of not > representing the unpopulated areas. Vectors are actually a great > trade-off, giving you almost the same access and memory costs arrays do, > but with all the advantages of being immutable (multi-threaded goodness). > > On Thu, Dec 22, 2011 at 5:11 AM, Simon Holgate <simon.holg...@gmail.com>wrote: > > > > > Hi, > > > I'm pretty new to functional languages but really love Clojure. > > > My work typically involves multi-dimensional arrays of data. I'm an > > oceanographer and typically use things like sea surface height data > > from satellite altimetry on 1/3 degree 2D grids with maybe 800 time > > slices (=O(5E8 data points)). For this I use Fortran and R. > > > I realise that I can just use Java arrays, but is this the best > > approach? I could implement lists of lists but I'm guessing that the > > performance would be worse? > > > What other structures could I use? The arrays are typically 30% sparse > > (since only 70% of the planet is ocean). This means arrays are > > wasteful in many ways. > > > Similar issues must apply in image processing so are there ways of > > handling such data in functional structures? > > > Thanks for any advice, > > > Simon > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clojure@googlegroups.com > > Note that posts from new members are moderated - please be patient with > > your first post. > > To unsubscribe from this group, send email to > > clojure+unsubscr...@googlegroups.com > > For more options, visit this group at > >http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
