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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。
; Y7 E+ o8 X: y% m# s; znetlogo自带的social science--traffic grid这一例子当中,2 }, }# @- ^6 r. W5 A( ]
globals4 B" k# E6 H7 x
[8 c7 ^8 A2 r3 W2 H7 g4 o) ^" Y' i
  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 a0 {: H/ A% _8 F4 v8 S, ~" R
  grid-y-inc               ;; the amount of patches in between two roads in the y direction; i; [: v8 o% g: w0 F: ?8 P% a
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if. D  [  i9 l- b! w) `+ t1 C
                           ;; it is to accelerate or decelerate' D/ w1 @0 b( q5 w3 {" e
  phase                    ;; keeps track of the phase$ B% ^" C& }; ^. ?5 [0 i" c
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure* d( c4 N$ A* Y9 q% W9 ^
  current-light            ;; the currently selected light2 V: `7 \4 n8 r% t. |
/ B! |  I& y: C
  ;; patch agentsets- e0 Y9 p5 U" q1 F
  intersections ;; agentset containing the patches that are intersections9 ^, U+ z  ~4 K3 D( z
  roads         ;; agentset containing the patches that are roads% @! K5 [; ^  }
]
* [* G, h, s( W& M3 l6 u% H! L& p7 a( ~, ^' H- T: S
turtles-own" A  Q( g# K: e
[
% l: [! _6 W$ Y& g& |  speed     ;; the speed of the turtle$ x/ K6 y, W  u6 @2 Z! ]
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  H( s' t# a6 R4 P3 J; L5 d: g  wait-time ;; the amount of time since the last time a turtle has moved
! X$ q1 L( x& h]
/ d) _+ _1 C: c' N/ _5 w; d- ]" j  P9 {. o
patches-own) ~( R* K0 D3 V$ N2 `
[/ O" `6 m, T' F: H1 \0 r
  intersection?   ;; true if the patch is at the intersection of two roads
+ G& Z8 g  }" Y" x% ?& f  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. [0 A( \! c" T  C7 k7 L
                  ;; false for a non-intersection patches.( [: G* @; f; ^7 A
  my-row          ;; the row of the intersection counting from the upper left corner of the
3 F7 o7 d# D6 n4 B' J) K3 e9 n                  ;; world.  -1 for non-intersection patches.
+ f9 y# V* q% F: N! d  my-column       ;; the column of the intersection counting from the upper left corner of the
3 R  j: H7 q8 \2 t& j) |                  ;; world.  -1 for non-intersection patches.
6 d- r! A' w7 T7 F9 l$ w5 }  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: E; i, ^% S) j* @2 L  auto?           ;; whether or not this intersection will switch automatically.
' Y! H( G- ~* ?$ w                  ;; false for non-intersection patches.
3 b; }, N2 I7 N8 c; r' l3 E  u]
% T" q: B' R( ^5 b. k0 J* u( u% I& c. s* ]" \6 }' `& f
) m( S0 l5 n0 n& a
;;;;;;;;;;;;;;;;;;;;;;
7 A9 m# ^  K+ R/ h/ q3 Z+ I% _! r;; Setup Procedures ;;
. e3 Y/ s6 d5 Z1 r& @;;;;;;;;;;;;;;;;;;;;;;# K% H' m3 E" x) \" D; M9 h8 o8 c
# x- X( w4 L2 y3 a
;; Initialize the display by giving the global and patch variables initial values.
: W5 l" \% j# L% ?7 Y$ ?2 Q;; Create num-cars of turtles if there are enough road patches for one turtle to
# e" U. U' f" o4 g  o, A;; be created per road patch. Set up the plots.
) Y( f8 o/ I* e9 h$ `5 [to setup$ e6 c) e3 S8 M5 I. W4 Z* b5 R' ~
  ca
1 [0 P+ s, Y" @- D, U' D; Z  setup-globals, [0 ]- j0 A2 k

3 x$ |% Q* B! z  i8 N0 h  ;; First we ask the patches to draw themselves and set up a few variables6 U/ A0 r* L0 k, ?6 M& V, c6 B
  setup-patches
* S$ ~! W5 l2 u% q  make-current one-of intersections/ s' q3 S7 h: s$ `1 ~
  label-current
7 q; _1 o( V  e" u' m  q) r+ w3 h6 |( H6 U; @, X. q
  set-default-shape turtles "car"
. J: K+ w% r5 j, Q# s& a6 B
2 U( F2 }# T2 Q1 h% |0 _3 _: Z  if (num-cars > count roads)
7 I& ?9 T9 P. }9 V; Q9 z  [
) e- i) m2 o' R; g; n, V! e    user-message (word "There are too many cars for the amount of "
# R! u% X9 n; f# K/ s' _                       "road.  Either increase the amount of roads ". p2 {- o- w! e% u1 z' T% B
                       "by increasing the GRID-SIZE-X or "& g9 y. W( c' N& G7 u- z6 n
                       "GRID-SIZE-Y sliders, or decrease the "" U+ f$ e( w" u
                       "number of cars by lowering the NUMBER slider.\n"
& i* y& j) Y; O& l5 D4 b                       "The setup has stopped.")
& x6 ~' S1 N# @    stop4 r  F) w/ X6 j
  ]6 x+ n+ z8 V* x& F( F
( }8 J" G& \: L; t6 k
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& ?: }# ], \+ O# F, l8 R! m
  crt num-cars2 j" B9 o. H/ Q0 O+ [5 E2 H
  [' `% ]& h7 R2 ]0 k9 v+ P
    setup-cars
4 m5 U1 N% ~6 i2 L. @+ X$ B9 w    set-car-color
. U2 ^. I0 ~/ Z  k    record-data
3 y  G' }  k0 E9 j0 M7 z2 I  ]0 t$ X) `# C2 m- `3 e
$ X/ ^8 u9 ~( ?# T
  ;; give the turtles an initial speed
* d" l, b  v  I; f# b1 n4 E0 e7 v+ f  ask turtles [ set-car-speed ]+ c% G8 d4 G4 A! b+ ?  C

$ p4 I( Z2 b2 I% d# r6 g8 ]  reset-ticks
; a. E& R- K4 D7 h. z7 v6 t$ b8 g: ?end
( t+ P# ^4 F3 U. \# W) v5 u: U
# |: X+ {6 I$ ?7 j+ v' i;; Initialize the global variables to appropriate values# t4 A2 I! k- @
to setup-globals* s( j3 u5 U2 z$ a
  set current-light nobody ;; just for now, since there are no lights yet* t$ k& S( V4 \  s
  set phase 0
' L& ~* L2 L1 W7 w6 a9 U  set num-cars-stopped 03 F: N' u; A$ a
  set grid-x-inc world-width / grid-size-x
3 G# ?' p- D$ l1 V7 Q" w  set grid-y-inc world-height / grid-size-y& Y8 O& \" M3 `) m3 m3 F3 E) `2 N/ L
/ `+ b# T/ p0 L; Z8 U* y5 o* H
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% @8 G' u+ \7 C0 n' X
  set acceleration 0.099
  l$ w' D* G" W' b6 s, Eend
' ]; {% G% J  g3 R1 W7 Y! N' g7 b0 ~4 o% T+ r% C
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! j" g) r# l* T  k9 N;; and initialize the traffic lights to one setting$ F( B( t9 M9 v  z/ A
to setup-patches$ C1 P7 j! H' x" u/ S
  ;; initialize the patch-owned variables and color the patches to a base-color: p& q; v1 S' v" A6 `2 {/ o: e* Z  {
  ask patches( h4 l8 z4 u$ v* C& n! s# [) X
  [
8 K# m8 A& }7 A% X9 U! O    set intersection? false5 _9 \3 K: \8 J! ]  Q
    set auto? false0 ?: l5 L) r' [! A! ?
    set green-light-up? true" R) U  y* d! `2 O0 y! Z
    set my-row -1; z3 ~. g2 q. A+ S* Z
    set my-column -1- Q7 F# P" |; R, a1 ~% d8 I& b2 ^
    set my-phase -12 C; C7 A) ^9 w+ T
    set pcolor brown + 3
9 L% e0 s' Q: i) d9 j  ]
) I  n9 s$ e9 ]2 i+ g$ m) m0 q  p) g, I2 c# u2 Q, C$ b
  ;; initialize the global variables that hold patch agentsets( w3 z6 y8 Y1 z8 h$ g2 f+ S# V
  set roads patches with
& `4 Q  d" A. B/ K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 w8 I4 F! Z. B* a; S% B    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. I: Z$ z4 J; V. ?$ {' b  set intersections roads with
7 B; E4 \* h' `' S& S$ e6 ?; l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 A" v! _6 |+ d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], {* n+ e4 G  K, c

2 B2 j8 x; \9 m3 h* H5 I  ask roads [ set pcolor white ]
5 m6 V1 ?+ ?/ n8 r    setup-intersections
+ L+ Z5 i; g5 x# f( E2 Zend& J$ P2 |/ D2 |$ L
其中定义道路的句子,如下所示,是什么意思啊?
' _/ `3 A+ ?+ P; v8 t set roads patches with0 L/ G, N$ W! f) t4 }9 s/ r; h
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 O( N, V& F+ H! O9 _, K/ c; C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 U0 |( Q4 Q8 {
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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