Nice! Thank you both for the simple answer. Again I find that I overcomplicate things in Clojure. :)
-thomas On Wed, May 19, 2010 at 1:14 PM, Laurent PETIT <laurent.pe...@gmail.com> wrote: > 2010/5/19 Thomas Kjeldahl Nilsson <tho...@kjeldahlnilsson.net>: >> 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? > > Ooh yes, just use = on the two elements you want to compare: > > user=> (= [[0 1 0 0] [0 1 0 0]] [[1 0 0 0] [0 1 0 0]]) > false > user=> (= [[0 1 0 0] [0 1 0 0]] [[0 1 0 0] [0 1 0 0]]) > true > user=> > > Apart from the reference types (agents, atoms, refs, vars), every > datastructure clojure provides to you has "value" semantics, not > object identity semantics. > And of course composing clojure datastructures preserves the "value" > semantics. > > Welcome to the wonderful clojure world ! > > -- > Laurent > > -- > 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
