You can use the equality function (=) if the ones and zeroes have to be in the same exact places in the matrix:
user=> (= [1 0] [1 0]) true user=> (= [1 0] [0 1]) false user=> (= [[1 0] [0 1]] [[1 0] [0 1]]) true user=> (= [[1 0] [0 1]] [[1 0] [1 0]]) false user=> If the shapes can be offset inside the matrix, then I'm afraid you will have to device a more complex algorithm. Also, less idiomatically I suppose, if the matrices are always four by four cells, then the whole matrix can be represented in a short (the number type short). :p On Wed, May 19, 2010 at 8:39 AM, Thomas Kjeldahl Nilsson <tho...@kjeldahlnilsson.net> wrote: > Hello, newbie question here. :) > > I'm writing a Tetris game to teach myself Clojure, and I'm trying to > keep the code ideomatic as I go along. > One of the most basic parts of the underlying model is representing > the pieces and playing field as two dimensional matrices. > > This is an L shaped playing piece (represented by a two dimensional > vector literal): > > (def L-shape > [ > [0 1 0 0] > [0 1 0 0] > [0 1 1 0] > [0 0 0 0] > ]) > > I want to check if other matrices of same size have the same shape, > ie. are the 1's and 0's in the same places in the compared matrix? > > I suppose the most straight-forward way is write a function which > steps through the two matrices simultaneously, comparing > corresponding elements one by one. > > My question: is there a more elegant way of determining equivalence of > collection structures like these in Clojure? > > > -- > Cheers, > Thomas Kjeldahl Nilsson > http://kjeldahlnilsson.net > > -- > 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 -- Venlig hilsen / Kind regards, Christian Vest Hansen. -- 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
