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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。
- C3 Z. }" m0 o6 C" rnetlogo自带的social science--traffic grid这一例子当中,
6 O+ Q: W/ h" J- U+ ?/ Z- M) [- H3 |% ~globals
' e" Z3 h3 E6 Z4 ~[4 \# N6 D& }  H- d% y& \% w/ Z7 }
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
1 Z$ m. v$ x7 g1 N" h' v  grid-y-inc               ;; the amount of patches in between two roads in the y direction
$ U# H" k& J$ }7 w4 i8 M" i  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
1 L- s1 s0 R$ w                           ;; it is to accelerate or decelerate- N% x" e" f0 A3 q5 f
  phase                    ;; keeps track of the phase! `* H0 [9 H. B4 B1 J2 z* p0 @
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 o' W( Y5 Q% g7 D
  current-light            ;; the currently selected light4 O2 h$ S$ A) S1 X/ k5 D

# c3 B& V; V$ y  p5 t+ x  ;; patch agentsets
# g) f4 [& m, C, Y- X6 m  intersections ;; agentset containing the patches that are intersections% H$ F1 g. L" }/ n
  roads         ;; agentset containing the patches that are roads/ T7 }* f1 F+ I+ R  G# h
]
. b/ o) ^, G; j4 W" x4 S+ ^/ c+ t) t6 d
turtles-own- f! y/ Y! A9 u( I9 q: Q. Z
[
1 @+ J# A( N* t+ X$ m+ H0 h  speed     ;; the speed of the turtle# J. K6 E( a' L, v
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right. K- O/ V3 x' ]
  wait-time ;; the amount of time since the last time a turtle has moved  \: O0 D) y8 @" f# w% j& P9 D: [- g* ~
]' p' S1 e6 r$ o6 Y" l  o

$ Y+ f2 T) D" w- ^" V; x! [/ |% ^patches-own0 i! ~7 j7 |- u; {) v+ b& V2 G) a
[6 }, u# g% c8 T7 o( c
  intersection?   ;; true if the patch is at the intersection of two roads8 f) u2 u' h5 h7 l0 M% r
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.3 H& ~) c2 i0 Z4 b: b- ~
                  ;; false for a non-intersection patches.
- u5 n9 O# O3 f' Q7 k  my-row          ;; the row of the intersection counting from the upper left corner of the
" v- N$ g$ I6 U: w6 [& H/ e                  ;; world.  -1 for non-intersection patches.- N2 g9 u7 V! p: w5 o
  my-column       ;; the column of the intersection counting from the upper left corner of the6 v& ~( O% e* Y7 w9 s/ A( N
                  ;; world.  -1 for non-intersection patches.1 X3 _: I9 H2 e& E
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
  |2 A. S: t) Y8 `- L* d  auto?           ;; whether or not this intersection will switch automatically.
8 x* t2 L$ `5 U9 O0 b; r( b                  ;; false for non-intersection patches.
' h6 i. Z7 Q. V0 u7 E- u" C! r* m. I]
, X8 \. ~9 x) H1 _, j6 q8 p2 C9 d: T6 I' x

- x8 x3 T' h' {7 ^' ~8 r! E4 x' K& R;;;;;;;;;;;;;;;;;;;;;;* J/ J- `! a0 I% e* P8 o
;; Setup Procedures ;;
: _2 G) S4 p9 \0 M$ D* y. v2 i& Q;;;;;;;;;;;;;;;;;;;;;;
3 P; V) o3 w2 ?' K2 c5 M$ B" Y$ j; [! q% ~* u, G3 Q3 R
;; Initialize the display by giving the global and patch variables initial values.
/ b/ x- u$ `# L9 v7 r7 ]( A;; Create num-cars of turtles if there are enough road patches for one turtle to  h8 j$ e6 y. v  w) e
;; be created per road patch. Set up the plots.8 p5 r6 _* ^; F: U  k
to setup% z) S$ n. Q" D7 M9 d6 w9 u
  ca3 t3 [& h, l% f& e3 w
  setup-globals
/ u1 g8 P% u" X% Y+ N& `5 Z8 L" {0 t+ u/ A
  ;; First we ask the patches to draw themselves and set up a few variables
- q" Z' i% P- I; Z  setup-patches+ u  D3 u/ Z6 G1 I, r
  make-current one-of intersections
6 o5 ^9 _: V2 d* p: g8 _. ^8 ~  label-current8 O9 u) C& J+ w) S  K- d

7 U. E9 s2 H/ W1 N  set-default-shape turtles "car"- }: t: c3 }" a3 {( X% A7 \6 t
4 x8 `& `1 {  u2 t2 [; h0 E
  if (num-cars > count roads)
% b3 a- \  ]+ \  [- b* S2 J) T, I$ k7 w
    user-message (word "There are too many cars for the amount of "
# y5 s. W/ E8 H2 q7 }! e                       "road.  Either increase the amount of roads "
$ v3 u; l! j/ t/ V4 H" n" k! l                       "by increasing the GRID-SIZE-X or "
" q5 O% t4 p* {                       "GRID-SIZE-Y sliders, or decrease the "' K2 q( U; s1 W
                       "number of cars by lowering the NUMBER slider.\n"; o- d' F' ^$ N" d3 I* d$ }
                       "The setup has stopped.")
$ O$ s: E2 g- u$ j% R: s5 a/ U& t    stop
' ]7 t* L+ i1 w: m- v) a  ]+ |8 g4 S7 x% j( [7 K
9 u$ W( }, d1 Y* r- j
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 ?, _$ D9 N6 }8 B  crt num-cars
, s, g& u0 j  b4 q4 h+ i  [4 q3 C# E& p' |
    setup-cars% R4 B+ H8 m' d: L  P4 @0 u
    set-car-color: L2 }1 {  j6 ~7 f- O
    record-data4 b2 Y; s+ R  o8 w
  ]
4 m1 U1 i3 o0 N, d
' ]- C, w5 m0 @* X7 c4 B  ;; give the turtles an initial speed! [  N$ T; W2 i* B. _9 i/ m8 \! y( v
  ask turtles [ set-car-speed ], g; v5 M/ Q/ q/ D$ R5 Y

& l9 @0 ^* X  |  q  reset-ticks! J$ I9 J1 `- {2 L+ F5 k% }
end
7 Y; G; N# T0 Y- c1 l! W) \0 J* H7 m6 b- a5 @4 a1 q0 D
;; Initialize the global variables to appropriate values7 I* w5 R, i% r# Y
to setup-globals7 b7 w; ~* e! g% y0 v" b
  set current-light nobody ;; just for now, since there are no lights yet
3 F; f9 s2 z5 h0 l6 @0 F% K% n  set phase 0
% ^+ x+ y7 Z5 J  set num-cars-stopped 0
3 Q: |+ l7 f' w, Z% @. B: L* g  set grid-x-inc world-width / grid-size-x6 w! Q) z! @- j& @, L; Q! ?
  set grid-y-inc world-height / grid-size-y- l9 d( @; k9 r4 j

1 @3 k, {4 D% |6 F! Z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" g1 I% u' y: l5 R7 g# \: n
  set acceleration 0.099
! d$ ]  ]3 N% n: Bend
# b/ v! W! b( A  r% k' t. t4 o, {1 {5 R6 J
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% Y$ R+ T! S+ ]0 B! C" c;; and initialize the traffic lights to one setting+ \8 g9 \: |5 Z9 ]$ h, l- P
to setup-patches3 h1 I" j, V- d' c$ r8 k
  ;; initialize the patch-owned variables and color the patches to a base-color
4 |6 ?+ {5 R7 C: i( b6 ?  ask patches- Q7 D( ]" l5 {) _& T
  [
8 X" j+ n% g7 P3 V6 S1 q    set intersection? false
( W! z. e1 }1 D; ~- g6 E    set auto? false
0 }/ U- R: U" ?$ d' f6 B& w    set green-light-up? true
' N2 L6 m8 g! C    set my-row -1( q) d) J. D: W- \
    set my-column -1
( Q4 Z+ v6 L7 @6 Y; k' P1 p    set my-phase -1* ~# W5 L+ j8 z# D! l
    set pcolor brown + 32 \/ z! B+ X4 ?3 q% }3 D
  ]8 l  z  p# B. ?4 R4 E

# L  J2 T0 x0 F& s  ;; initialize the global variables that hold patch agentsets( x3 c! C) L# H% X
  set roads patches with# B+ m/ z9 i6 }. |2 _& t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) s% I* C$ g" U/ c1 ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  `, N3 n  g6 R  _# ]9 n  }
  set intersections roads with
8 d3 q5 f6 o% c( K7 R( {: E6 L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" y2 L/ ~8 w# }: T, N* E6 |' Z( x2 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ ^0 t) H5 a8 w
, l, F. U3 ~$ K( d6 v) l2 m' r/ O  ask roads [ set pcolor white ]! g, v4 }5 V9 t7 A
    setup-intersections
. r, w0 \2 u1 T! bend
: B0 _! V- C1 P其中定义道路的句子,如下所示,是什么意思啊?2 l# }% C* ]0 h1 {
set roads patches with
  j* Z$ X4 I, _& ?- s9 y* i; G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 [: Y* ~* g4 b7 @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- W/ R" y7 J6 [  F9 J  U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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