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[求助] 在看例子时有几个问题看不懂

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发表于 2012-6-20 08:59:43 | 显示全部楼层 |阅读模式
新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。( u9 E+ y# o7 w: x
netlogo自带的social science--traffic grid这一例子当中,# w, e6 R2 R$ q2 Q$ h
globals$ ?2 w4 Q" p" Z( ^
[
! _! w+ J) @1 t( Q: ]  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 X( k: E; U9 r9 v/ O  grid-y-inc               ;; the amount of patches in between two roads in the y direction
; D. C& g0 e4 w' X% J  acceleration             ;; the constant that controls how much a car speeds up or slows down by if2 I1 [1 M+ ^8 {
                           ;; it is to accelerate or decelerate3 P6 E+ }# p9 L
  phase                    ;; keeps track of the phase
, ]! g( g# ~+ n# o  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure* @* i* a1 `0 x, B
  current-light            ;; the currently selected light" j, w. H! Q) c  @" P3 c7 T
4 I" _$ x7 a1 [% t! D7 }" q
  ;; patch agentsets0 I+ G, o4 }5 `' b! b6 j+ I
  intersections ;; agentset containing the patches that are intersections
( G! b* d( l$ N2 n  roads         ;; agentset containing the patches that are roads
" o; r6 n# \0 l5 G  l& \+ I]8 k/ N* q9 T7 [. y5 B! h( t8 `

; h( c% }9 s. _. g' ~! E" U7 ~turtles-own! x4 v! D) r) u, ]7 q8 h
[
9 @0 A3 Y2 h) r, c5 F  speed     ;; the speed of the turtle
% w& z* S! |& L  ?. q. T9 f& P  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
) }+ Q* G# k0 s* K" X  wait-time ;; the amount of time since the last time a turtle has moved
1 F8 S. T$ m( A0 E! G. E# s]
( |0 y! R/ D+ z% p# [
* `" J* F) L1 P* C. L, F/ }patches-own- O% {5 Y- ^- l5 F, k1 w5 W
[4 ]8 o6 J0 E; s  m# q' r2 c
  intersection?   ;; true if the patch is at the intersection of two roads
8 [0 j* K: Y2 n( R" r  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- F0 }5 P1 q% j4 L* z6 J
                  ;; false for a non-intersection patches.
/ q$ Z4 b' k. z6 P2 \3 {7 K, ]/ B  my-row          ;; the row of the intersection counting from the upper left corner of the
, x/ ]2 p8 E5 j0 B- Q* Z/ l* X                  ;; world.  -1 for non-intersection patches.) n1 @! a" w6 L" }+ B
  my-column       ;; the column of the intersection counting from the upper left corner of the: W) e6 O* }+ w$ i% v8 O
                  ;; world.  -1 for non-intersection patches.
" o& G9 U7 ]. y" [8 z  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' }; m4 M$ X( R( F. K1 {
  auto?           ;; whether or not this intersection will switch automatically.: s4 f- R4 D& w1 I
                  ;; false for non-intersection patches.' O+ L: |) n1 x
]
% T1 c( z" w8 G: j: \
4 y/ C" q; K& ^0 K7 s
! n' D. }: B8 x/ ?/ ?( Y! r;;;;;;;;;;;;;;;;;;;;;;
% O+ D* U/ ?% v  {* S;; Setup Procedures ;;. z$ V$ I; s0 ~
;;;;;;;;;;;;;;;;;;;;;;4 b* Q# s2 X( c9 b& _0 V! e

. I& w' j4 z! B* b; N% a: f1 u;; Initialize the display by giving the global and patch variables initial values.6 `3 o5 E& W- j3 c+ |
;; Create num-cars of turtles if there are enough road patches for one turtle to1 m% \$ J' v6 A: h- h3 I, \
;; be created per road patch. Set up the plots.
! K' @4 z* O. d4 G2 v* w- zto setup
$ T3 l/ k0 H2 N) W, Z) X% @  ca2 u; p" c; `$ t2 p5 w
  setup-globals+ Y1 T" K( u& U; K( H
$ w0 Z) E; u$ }& A0 R2 ^
  ;; First we ask the patches to draw themselves and set up a few variables
, v* {- c8 g! m3 o4 \2 M* h  setup-patches7 G  p: f9 [% O1 y
  make-current one-of intersections
0 p; [% L7 _3 r  label-current
$ e% ^- @9 p) W1 a: x  ^- F- }: Y. ?' e/ d/ f/ Q" c; y' b
  set-default-shape turtles "car"' A6 Z# M  t" _) F0 S( w9 S
+ r( P5 G! A% V9 j+ N5 q# E
  if (num-cars > count roads)
3 V  Y( Q- K$ v. M" I/ t- W3 U# ^  [
* O0 b9 O- `: I. L$ [    user-message (word "There are too many cars for the amount of "
& {- c- `5 {0 x( p! c; H                       "road.  Either increase the amount of roads "0 V2 u- C: K, @3 l1 d
                       "by increasing the GRID-SIZE-X or "0 X* k6 y+ H' l8 B* |
                       "GRID-SIZE-Y sliders, or decrease the "8 w: U- F; l  S2 M3 d0 N8 R
                       "number of cars by lowering the NUMBER slider.\n"
- Q& n2 j' j( C& C/ K" F                       "The setup has stopped.")
4 D) c0 M" n. f* ^2 L! T    stop
# y6 u/ S2 Q) l2 w+ x8 {$ N: J  ]
3 Q  }  ]; a  C$ O5 ~! o# R5 p9 H" i2 h! v: i
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. H% Z# w3 ^+ A( k7 R* x6 ~; {- y  crt num-cars' r% A! W8 d& |1 l
  [) x2 C- R4 b* v4 z7 R/ J5 I- p
    setup-cars
0 w5 }+ V$ s% _* f# n( @/ S4 m. w    set-car-color! K: `  ]' ^; p4 ?; C! @
    record-data
' X( ^/ [0 I+ X  ]
8 U$ N( c" g4 h! Q6 A. `  r: x& f* G- I& e. k7 b
  ;; give the turtles an initial speed9 {( E8 A! s9 a
  ask turtles [ set-car-speed ]: G# @3 N9 T  T' i# O
/ @& [9 J/ x6 O2 R
  reset-ticks% v7 v% j. p2 |5 _7 E
end
9 ]: s7 m: \& k9 Z1 t$ o- P4 S
1 s- s" w2 f7 o& {' ^;; Initialize the global variables to appropriate values
' P% L9 M6 Y4 A) @- zto setup-globals/ C5 J; T% C1 q3 r; b! [
  set current-light nobody ;; just for now, since there are no lights yet2 g( n; C) I% ?0 L3 O, s* _6 X1 d
  set phase 0. b9 G" a) V9 a
  set num-cars-stopped 05 \, ?; j1 V" Q7 u
  set grid-x-inc world-width / grid-size-x' D. [' X7 r; f2 i7 v, [4 @
  set grid-y-inc world-height / grid-size-y
% s$ f+ a$ d1 M5 M1 H9 z, f1 E9 q. B) `
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. _; j" p; ^# \6 D
  set acceleration 0.099
' u& v3 z8 g4 y% L1 g1 s) C- Mend) F& j4 M; ?+ ~2 H

% E- _" T3 E" C! }6 E;; Make the patches have appropriate colors, set up the roads and intersections agentsets," F" _% I5 C; p" F. }. a
;; and initialize the traffic lights to one setting6 J2 g7 w8 m, Y
to setup-patches
0 o1 f9 s/ C6 D  q2 k5 \! m3 O  ;; initialize the patch-owned variables and color the patches to a base-color) p7 j( w& w* J- m! F" e7 F/ t
  ask patches
' I+ i9 |$ i* s8 v7 I7 i- o. z  [
6 z: k$ A& _: N1 F, V! e    set intersection? false$ t) N2 R0 L: i5 Y$ M& e
    set auto? false; D8 E" m. Z: b" o4 D& H9 ^9 B
    set green-light-up? true
( r2 R  Q1 B! D: L    set my-row -15 _0 J5 I, i) Q, B& f8 O8 T
    set my-column -1* {# J& h8 V; D5 Y0 H$ |4 v- Y/ Z# Z
    set my-phase -1& p& c6 Z% o0 M0 I" N5 V
    set pcolor brown + 3
- W' S: k, F3 E/ v  ]
; }$ X; B+ i" \9 P1 Z
/ V! M2 v7 J: B1 F3 @. s$ z  ;; initialize the global variables that hold patch agentsets+ D. Z3 m/ b* T9 S0 \
  set roads patches with  x; c5 f4 |4 e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# {% k* t4 ?# L+ `8 t. |$ ^/ t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- r( P' c. u) x. p/ R
  set intersections roads with
" S" c; s9 i& u( g8 L7 n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 y+ w- `0 ^: Y* P* _2 ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# `) v0 Y' v4 h0 u) ?; g% N8 _

, r5 ?' }  k& D  ask roads [ set pcolor white ]7 l; _4 T1 h% p  D" n0 s
    setup-intersections0 Z( D* i, K, l( [+ _: w) [+ a
end
) h) x1 k: G1 `1 b* n2 k) v( `其中定义道路的句子,如下所示,是什么意思啊?, L# Q6 U, ]/ ?( E7 |/ |: t
set roads patches with1 z- x# M* W; S3 h3 W/ i) ]0 q6 Z' [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ ?. K/ F/ ^* s6 S0 ~* G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) A" W$ o1 T7 Z
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗?
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