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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。
' ]' E/ G$ z% B% W' r; g3 g: H+ gnetlogo自带的social science--traffic grid这一例子当中,
, i' _  A/ k9 @$ Sglobals
: t( l# w. E' x  v( u* u5 M[
, X5 `8 @3 u9 T( @7 Z1 Y  grid-x-inc               ;; the amount of patches in between two roads in the x direction) _3 R2 H' x* A/ v" }  B, i* O6 f
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 R- a% J1 ~( Z  f# V  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ S1 s/ q/ o  P1 x" @5 S5 {& e
                           ;; it is to accelerate or decelerate2 M; s. u6 o+ ~& x2 E
  phase                    ;; keeps track of the phase9 u# ]3 t% x% T/ r- L( U! {
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure4 R, ^: Z! a* P2 q; I4 a
  current-light            ;; the currently selected light
& h7 N+ g* h( r0 R  I, R# v: c
; w, }. c& g1 q  ;; patch agentsets
4 H7 ~4 ~9 i5 J. |) e0 D! R  intersections ;; agentset containing the patches that are intersections% z/ W0 o3 x. w% P- h5 R1 [- w6 q
  roads         ;; agentset containing the patches that are roads# Z/ w5 o, B- t
]
1 C5 ?: p( }$ T. [+ u
3 ~  A0 q2 G1 Gturtles-own3 g) f0 [- I3 o' E1 x  s$ k
[6 \& w7 R9 q) B* Q* f
  speed     ;; the speed of the turtle
1 v+ w$ b2 y$ r0 ]( l5 g" V4 I  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. h0 S9 l: _* ~8 i- C7 i" S) |: U  wait-time ;; the amount of time since the last time a turtle has moved6 T/ J" F9 C8 [# \5 I2 a! h6 |8 y
]( s9 g9 I$ d! g" `1 b
; m) V7 R9 R* p3 b+ c) O+ A3 J
patches-own
4 I, S* @, x, U8 |' `9 P; K4 W[/ V+ C$ n7 K& a, a
  intersection?   ;; true if the patch is at the intersection of two roads
6 O( G: ?2 b& w! H) b! t. l3 w$ e3 Z  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  l6 e7 D' |% w! Q( B# f  ^: L                  ;; false for a non-intersection patches.
$ E% X5 C5 a( p4 B1 N# V3 r. }  my-row          ;; the row of the intersection counting from the upper left corner of the
( a( u* S* Q# `+ u" ~; I3 }                  ;; world.  -1 for non-intersection patches.
. u, }5 ^4 b$ D* Q  my-column       ;; the column of the intersection counting from the upper left corner of the( \& H. B% D4 v
                  ;; world.  -1 for non-intersection patches.
+ |8 }0 w7 F6 Y3 H) Q2 y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& W* c1 T5 y' V+ ~0 [5 `  auto?           ;; whether or not this intersection will switch automatically.1 B4 a- Q, J- Y1 z
                  ;; false for non-intersection patches.0 \& k+ I' ?% Q; @+ m& w( A* x; o
]' j8 }, _' V& a; ?$ x) e

4 F! B3 K% J/ t) b  ?3 w
: j/ {3 A; }3 P. v% e;;;;;;;;;;;;;;;;;;;;;;
: o: V% q! |! P4 @+ g' t* t;; Setup Procedures ;;
: f1 r/ G4 y4 d1 [4 s;;;;;;;;;;;;;;;;;;;;;;! u1 T7 N/ ^0 {1 l3 I+ g! _: J
& F, N1 D) {2 V% e$ f$ D
;; Initialize the display by giving the global and patch variables initial values.) c* a( A5 T: \$ A9 O- y5 A8 p5 Q# m% G
;; Create num-cars of turtles if there are enough road patches for one turtle to
: f$ [# c+ K2 k8 v;; be created per road patch. Set up the plots.3 `6 A8 N/ j, I& w
to setup$ P  a# Q+ M  k* S8 Y
  ca
+ g5 a" a% k  F8 U  setup-globals0 ?/ x) [- m: f" @) E& R

' |4 Q" H) `) T# Y) {  ;; First we ask the patches to draw themselves and set up a few variables4 {4 P& }9 [! N- l
  setup-patches5 E1 v# G0 ~* ?# }# U' [
  make-current one-of intersections  \4 {7 N5 x: L
  label-current2 C* m: o: K  W4 x& L

1 \' i$ F. o" k4 }' p8 A  set-default-shape turtles "car"
) s3 x1 p9 G3 g* R: }, U/ T3 ~  W6 w* b1 }5 B1 q- N- |! D
  if (num-cars > count roads)
  l! V  r* c* u- ?/ @: Z5 m  u  [4 l8 `. u2 d& q8 z2 v
    user-message (word "There are too many cars for the amount of "; _  U2 A% q' z6 D7 W1 h4 l
                       "road.  Either increase the amount of roads "- O2 r  @) Y4 S: A$ v" M! C  h3 ]
                       "by increasing the GRID-SIZE-X or "
; M) @9 R, E. X; h                       "GRID-SIZE-Y sliders, or decrease the ", E9 G3 z5 T9 x) t
                       "number of cars by lowering the NUMBER slider.\n"
4 Y3 E. N' _6 v, W& V                       "The setup has stopped.")
0 \4 g8 y% w( m1 R+ v    stop  G% q4 ]) c* H3 _% N2 R% Y9 W
  ]% J6 M2 _% U% p$ O1 P! K
1 {  e7 K$ y' ]" Y$ P
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  Y) j$ T) D/ x- E/ @4 c
  crt num-cars7 J3 Q' f, X4 Z3 Q) K
  [
& [+ B/ N$ B( n' S    setup-cars9 a+ F% C% m0 `6 e2 O7 ~! M( q
    set-car-color3 q! |6 j: K( q) N2 N
    record-data9 P' y6 f) g: s) {7 a
  ]
' `& I% K2 m1 C( ]9 x8 I# v3 b; }/ a6 x+ p# X; y4 d
  ;; give the turtles an initial speed
7 T/ \' ^- b6 |: L4 b" L  ask turtles [ set-car-speed ]
+ g1 y1 N& S& s0 K8 N: s6 f% K, o( d  r4 [
  reset-ticks) y7 ^" ~8 W$ l- F1 D) J
end( u9 p7 g, u, W# f- u. J' b
3 G/ r/ s# u0 ~; J
;; Initialize the global variables to appropriate values
# Y& ]9 O, v4 vto setup-globals
0 w7 b7 r$ Z  y! R  set current-light nobody ;; just for now, since there are no lights yet
" G! {0 h' j6 t! M$ |  set phase 0
  {  R& V& [3 F/ N+ i$ I  set num-cars-stopped 0
' S+ g) F$ x6 I- t7 m4 Z1 B! u  set grid-x-inc world-width / grid-size-x/ T1 W: Q. u- w9 x' b! J2 g8 h" y
  set grid-y-inc world-height / grid-size-y
/ F* N% ~& y6 D1 P0 V* e( {6 \
# g7 Z7 _  d/ y; X4 K2 H/ ?  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- p" F% L5 |$ n. V+ t# L8 I
  set acceleration 0.099
" }8 e. V) t* H; Fend/ C1 @+ Q7 Z" e
" w2 n1 v, I1 Y# s% w4 |4 _
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- U: {; V7 S% _* Q# o' i
;; and initialize the traffic lights to one setting
4 P/ m+ M# T' q# Cto setup-patches
8 Z9 x; v3 p5 T  ;; initialize the patch-owned variables and color the patches to a base-color! v; T) V8 Y$ a  Q& M2 j
  ask patches, a4 Z9 a8 ^' B+ u1 T  B& d
  [/ u+ G  D+ W0 h. J3 V& K5 F& M2 c
    set intersection? false  L& G8 d) m% e# d9 l# i
    set auto? false
9 r$ C1 Q# o% ~3 ]( e8 T, L    set green-light-up? true
" m2 V/ ?% E- @' `% H. Y& E    set my-row -1. E1 M6 y3 H3 ?; w7 T3 z
    set my-column -1! {: Q- w: K3 @+ o
    set my-phase -1
/ D! _6 t# q+ U/ C0 R    set pcolor brown + 3
# a/ e, R5 S9 ^# o- O: r  ]
7 ~! W8 @+ T  v$ B- |! i/ b/ D- b/ Y; U; f) W$ `9 ~
  ;; initialize the global variables that hold patch agentsets
# ~+ c* Q. \& L" R6 E: u& [# T  set roads patches with
8 h; [) w) p7 Q) }- l1 j/ t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. Y4 i0 u1 b9 \5 }+ k8 G- s3 V+ L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ r1 G4 J# M+ f* Z9 A  set intersections roads with
, V1 r1 f$ t4 T# f/ R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& \; L% I; f$ i+ U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. i# u4 J1 n4 B( q" t: j
( p4 y$ [2 n& j0 g. S  ask roads [ set pcolor white ]' a9 z: I  _7 a, ?7 i
    setup-intersections  k* _) X: [8 c3 N
end
( u+ e) ?, b4 K9 R1 r9 E1 _其中定义道路的句子,如下所示,是什么意思啊?
: R6 n! E' X8 E% |5 z" q  g set roads patches with: Z- y6 G9 a0 Y6 [4 |6 ~" _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 U: X  `8 }8 l& C/ K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: o# b7 H7 }0 C7 O# g; h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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