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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。
6 Y* u6 a0 E2 c$ B* A, D7 B! nnetlogo自带的social science--traffic grid这一例子当中,
* h2 C! b5 c& L5 tglobals
7 R2 ^. e6 X0 |; I[
0 q2 w) ~9 W9 ~) E5 k  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ S1 }  }7 q) M5 i& q9 k  grid-y-inc               ;; the amount of patches in between two roads in the y direction- S( E: }: H, y7 W1 |
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
  h4 O- `# R6 i8 C' [! L                           ;; it is to accelerate or decelerate" H, h/ A  Q" K" I6 g$ x1 J
  phase                    ;; keeps track of the phase
! Y1 b$ P" H, N0 Y% W: H- ?1 `  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 s/ Q7 p# u3 n: Z8 D" p* S% F
  current-light            ;; the currently selected light0 _: p; z0 K* I3 q2 w6 k" z, M

3 p0 S. K( _( G  ;; patch agentsets
( o3 K% d7 C+ p1 r  intersections ;; agentset containing the patches that are intersections
% `* `8 n( ]; a  roads         ;; agentset containing the patches that are roads/ r) v. V1 [# V, g. Q5 D) ~1 k2 t4 G
]
7 F% m" I# y9 |; V7 |% @
+ H& J; U! i4 T! Uturtles-own
# H- a* ~. E0 \2 ?# l; _2 o[
1 w4 T+ b% L" i  v  speed     ;; the speed of the turtle+ x" N# x* L- g4 C9 `3 F+ O
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& e1 X1 O9 e6 `& o6 Q$ A& F  wait-time ;; the amount of time since the last time a turtle has moved
, f4 F7 g$ Q- ^% ]" ]]
; W4 y( O9 t  G
! Q  e; B$ L6 h8 e  m: v  n, k( Fpatches-own
8 ^7 U% l' ]( q2 u: e+ T% [3 _& V[
) o1 R7 m. v2 Q2 L; z' o  l  intersection?   ;; true if the patch is at the intersection of two roads  U8 `, R+ G/ s6 }) v7 [
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% [4 w0 l1 m) m                  ;; false for a non-intersection patches.  y/ \5 o' Y" c
  my-row          ;; the row of the intersection counting from the upper left corner of the5 h; _/ \. E( O% y( x5 s" e
                  ;; world.  -1 for non-intersection patches.
- O5 F3 L- u- @; S7 Z  my-column       ;; the column of the intersection counting from the upper left corner of the
  u. c5 P9 a) F. e- `' G/ X; S! ?3 n- ?                  ;; world.  -1 for non-intersection patches.
( J9 k6 t) B3 I' M  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 x5 C  g( i1 z6 V, m
  auto?           ;; whether or not this intersection will switch automatically.
+ e* v* {2 m* {7 f0 R7 m5 y$ @                  ;; false for non-intersection patches.
" J: t$ U9 h: c]0 ?  }) n2 H4 `& K) r: C9 I: D
( P; z& v5 z* ^
* t8 o4 j0 i7 |8 Q3 s
;;;;;;;;;;;;;;;;;;;;;;5 d6 y7 t9 R& ]" J
;; Setup Procedures ;;; e6 a- |' f7 x" p1 K8 k- h
;;;;;;;;;;;;;;;;;;;;;;4 o+ ~1 |4 O( H3 O; s- A

7 v4 W1 e/ v+ p8 {; h;; Initialize the display by giving the global and patch variables initial values.: q5 ?9 u% z  u* z
;; Create num-cars of turtles if there are enough road patches for one turtle to
; x4 ~% g  o7 d1 P$ G4 U;; be created per road patch. Set up the plots.5 N/ L% Q9 z6 y7 q& i
to setup
) v0 {( i' `9 q. o  ca& d0 I  M/ B" M6 U4 A
  setup-globals7 D# `% I* f% O, e* b# O
, F0 k6 B4 u; T
  ;; First we ask the patches to draw themselves and set up a few variables
/ T7 n; m5 a3 q% _8 F  setup-patches
# s4 t1 l0 [, C) u- H! z( ~. l  make-current one-of intersections
" Y1 {+ D* `4 p0 }5 c. W8 K6 Q  label-current
' ^: G& ]( a1 S# I0 N$ g
# v4 `/ \9 ~* ~2 I2 V3 U- M/ g  set-default-shape turtles "car"* _9 u6 J" X1 \# m9 z; X, m& M8 S
# b! o6 w: u/ G3 c' h
  if (num-cars > count roads)
3 l- F8 G* x2 c1 c  [! q/ D+ T4 P4 P, W
    user-message (word "There are too many cars for the amount of "
: G( `2 N% y9 W/ v) N                       "road.  Either increase the amount of roads "( N; U0 e3 ?/ O/ J1 ~
                       "by increasing the GRID-SIZE-X or ", N& |. y2 Y9 l8 k! @% h1 O( r
                       "GRID-SIZE-Y sliders, or decrease the "- t6 n3 L' b, p( P
                       "number of cars by lowering the NUMBER slider.\n"
; h! d% d) ~5 s1 G1 ?3 j- e                       "The setup has stopped.")  @* c8 {& G: r* w2 M9 H
    stop! b3 w! B! p* n0 B( {. n
  ]3 o4 d9 m- G8 T1 x% b7 U

7 _" Y% M8 o$ u/ T; I  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 q( M# Y1 l1 ]; W
  crt num-cars
( t( x% G8 o) J- H# H, p: W1 P$ v  [" `; ~6 z* l, e. ?
    setup-cars; D) a, I2 P" Z: f. `. j: q6 v
    set-car-color2 E0 |1 `0 \: ^6 R* c# G  E
    record-data
% e. l- ^4 ^1 f/ w1 r; x5 p  ]
) }  G+ T4 N! l% i, `  j6 P& c# y' z3 D" Y) I4 f3 I+ d0 F1 W, J1 Y
  ;; give the turtles an initial speed
0 N8 C. _8 S# Y" l: B3 j1 F  ask turtles [ set-car-speed ]- J2 h& P& j/ X7 y  ?
& K- A/ x; T' c* @* o, Q
  reset-ticks3 q+ i6 G( @6 q* n
end
4 V- ]7 C1 F$ t  i0 N$ n. h
& ~# O+ o) _$ U% q0 Z* u0 V% T# w;; Initialize the global variables to appropriate values3 V0 V5 Z! w8 U# j6 X
to setup-globals0 B" X$ f& t9 D6 C
  set current-light nobody ;; just for now, since there are no lights yet$ B) |0 M+ c1 t8 K2 L3 O
  set phase 0
8 Y( {: [2 z! ^# a8 `7 o+ o5 d  set num-cars-stopped 0
, f% H1 t7 z2 W: Y" x) P' E  set grid-x-inc world-width / grid-size-x% N4 ?" `+ L2 y  b1 B% }
  set grid-y-inc world-height / grid-size-y, R, q0 `9 B' ]- b; o

( N$ ~* t$ S, }0 U+ h  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 h3 e. I" k8 d2 _3 H9 ~3 ?  set acceleration 0.099# m$ R) R0 ^  X1 S7 `
end4 Q" `( ]% \0 U& O8 J

4 q8 v2 q6 A0 D( J;; Make the patches have appropriate colors, set up the roads and intersections agentsets," N: }3 \, I; I  x" i
;; and initialize the traffic lights to one setting! ?  Q$ P0 m9 G+ W/ @: m8 _
to setup-patches
; w! a- Q* l# A  ;; initialize the patch-owned variables and color the patches to a base-color' C9 Y% R2 ~, I$ u$ l5 g; C/ o, _
  ask patches
8 Y1 q) N  K7 I. T8 {$ f! n  [7 e! @; b2 V; E0 d1 m/ V# a
    set intersection? false) h, E8 L' m# x
    set auto? false
5 R# n) c6 l. F8 o. i& \    set green-light-up? true
  W) A& g9 f: D! \! S' Z    set my-row -1! \2 ~& ?# {+ l5 V* h' ^4 \: h% B
    set my-column -1
" ]7 ?$ W2 e- J! L/ ^* R4 k- P    set my-phase -19 R, t6 R; [2 w4 j# z( X! v
    set pcolor brown + 32 \: [# f/ R: m0 `1 I0 @
  ]
6 L# i1 b! k9 A4 {4 v% S0 O. X) d; B3 w
  ;; initialize the global variables that hold patch agentsets) W- I! a+ }5 ?5 T" j% m
  set roads patches with
" y% t$ k* C4 E, A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) X0 w, G5 h3 d+ D" k/ e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ f1 E3 N; j6 F! a/ O  set intersections roads with9 [. }+ Q+ f% _' x5 H8 u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" o, b. K. o9 T' o# q- s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ ]) h( e1 l9 m% P$ D7 h, i: Q7 e
+ B4 F" C8 @( P) r
  ask roads [ set pcolor white ]
7 ]) W& A' E) K( h5 b    setup-intersections
( M( E  [' Z  `, h: z5 Pend
1 H4 q; M& o: \9 Y/ g% q其中定义道路的句子,如下所示,是什么意思啊?% [. [$ Y  S+ U8 x2 D6 _: D
set roads patches with; |7 o( I* ]) R4 A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) t& `- e7 D9 \) N4 O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. B4 m) y7 [( x3 D
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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