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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。
( W, I3 J0 d& D9 S. T- Anetlogo自带的social science--traffic grid这一例子当中,9 H- P2 X6 f# N% N; K2 L
globals; L: P" [, u. Y& N% T: C0 M
[
* F  I$ H0 |/ h, @2 \  grid-x-inc               ;; the amount of patches in between two roads in the x direction
  }1 `* O; t6 S. V/ E  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 L. F) \/ e* B. N  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) C9 l+ _0 y. Z7 m
                           ;; it is to accelerate or decelerate0 `# G: T- _4 S2 v+ ?- P) |* d
  phase                    ;; keeps track of the phase2 u- Z' r( e# t6 W- X9 P
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; \3 }! i. [( o* l5 c. g
  current-light            ;; the currently selected light9 D  ?- s" Q, ?$ D

/ l% a9 q8 |9 U  ;; patch agentsets$ \# R8 C0 q. G  F$ S8 r; V
  intersections ;; agentset containing the patches that are intersections; |" q! v9 |  Y; R
  roads         ;; agentset containing the patches that are roads% t+ O( U, N# i' D0 T; [5 j8 |6 h
]
( H! B+ s: [* \: x2 m6 Y6 E7 Z6 W& y+ @- x& _; i) r$ S+ v
turtles-own
$ e; H8 w) p) p- q/ [. E[7 Z  x3 [* t* B/ i0 F  ?
  speed     ;; the speed of the turtle) d7 `" |" X* c. r3 @( L
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
: R1 f: k  M/ p" |2 O7 C* g' P  wait-time ;; the amount of time since the last time a turtle has moved
) \8 o# P+ r  {5 g]
# i' @/ o& z" ~' u' a
: r4 u' [+ K3 u, cpatches-own
  P, K- O  V; E( x  N. r( [[1 `' P7 a: A% G9 I& q% J
  intersection?   ;; true if the patch is at the intersection of two roads8 E( }& W0 G: F2 U, x
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.5 o* Q8 O* w1 I, k
                  ;; false for a non-intersection patches.
' L8 [1 s+ z3 d8 u: ^  my-row          ;; the row of the intersection counting from the upper left corner of the
7 J1 p- C  S# o. }* ~5 ?5 l7 U/ N                  ;; world.  -1 for non-intersection patches.) }7 `& Q4 T" e  @  `
  my-column       ;; the column of the intersection counting from the upper left corner of the
$ q+ d; Q) _1 f5 C: v1 a. L$ S; g                  ;; world.  -1 for non-intersection patches.  J  F3 Z9 s! S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 r  s0 I: |8 |% \' M  auto?           ;; whether or not this intersection will switch automatically.
+ P* C- f& O  E, g                  ;; false for non-intersection patches.2 A. W- l4 I2 s: M# b
]  w' S- _; U, W7 J/ F

6 j- [5 S& C5 Q  i
* g& K% t! E' }' l/ o$ A8 R- }1 @;;;;;;;;;;;;;;;;;;;;;;
4 Z# R/ C3 ]0 Z1 O8 U0 e5 F;; Setup Procedures ;;3 ^- m+ l0 Y; m  `+ C
;;;;;;;;;;;;;;;;;;;;;;& v2 D) l; s4 y! Q9 |7 \

. }. A/ h$ h: c1 m4 r;; Initialize the display by giving the global and patch variables initial values.2 D) p/ ^" N. r' O/ O6 ~0 {! [9 [7 N
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 e8 T" ]/ f: R- w+ \;; be created per road patch. Set up the plots.0 j1 u! @* \5 Y/ r# e
to setup: u9 s' w& X9 f( W3 X+ o
  ca% m, ]4 \) L9 q! A, f- f
  setup-globals" }. c. g) v. P, x! T( r! k# [9 \
7 d5 @4 P7 \5 p- ?6 k" @6 B
  ;; First we ask the patches to draw themselves and set up a few variables
; \% ?- h7 X7 _: Y  setup-patches. f6 \7 s0 ^4 X5 M& U& s! [3 c
  make-current one-of intersections) [; }2 K4 a7 g8 V, m! c; a
  label-current0 F  {. K2 a: z
$ l7 L; K! \5 Q6 `- `- w
  set-default-shape turtles "car"
7 m8 B3 _6 R' v6 z5 v) g! S5 m) F' m( J' q; O7 D  L6 C
  if (num-cars > count roads)1 j/ U2 V6 l1 _+ `6 p
  [
& z* |+ d3 p5 L/ t. q& c" h* V! h    user-message (word "There are too many cars for the amount of "
8 T) T2 |, j' I, U                       "road.  Either increase the amount of roads "+ a. k" Z+ [9 J* a/ c6 k
                       "by increasing the GRID-SIZE-X or "
" o1 o1 p: }3 m& A  W1 J                       "GRID-SIZE-Y sliders, or decrease the "/ u6 }! x7 ^  Z* C7 f
                       "number of cars by lowering the NUMBER slider.\n"( G: R4 h% B* k2 f
                       "The setup has stopped.")& `/ U$ Q" Z- t4 ^
    stop( I3 Q6 F2 Y- f6 E
  ]% K2 H+ g) D" w: y( J
! p3 Q- K6 s- C& b
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# X7 F8 h" {. B3 C' A& a1 s; |3 x  crt num-cars
7 t$ t4 W% Z& Q9 {9 s( d  [
; |1 Y$ W' B+ u: [) ]3 B9 W1 q0 [    setup-cars
7 k) G' d$ ~( i3 G9 U    set-car-color
" A. N& [- U2 ]$ A. E  O    record-data
. e8 T, a( }9 M' q/ m& Z  ]
. L- A2 J0 q' o4 z: U
; h; g# }. w0 E" ^8 `- Q  E  ;; give the turtles an initial speed
* s0 v3 o- c7 q% ^9 V  ask turtles [ set-car-speed ]7 k; _! S. F' G, P  G
! }" v. o) M4 [
  reset-ticks
; d4 ^* G7 E( q; f) r6 Mend
4 ^8 r/ ^  x- Y* d: c' c4 s. z" s6 M: d- I. L2 @
;; Initialize the global variables to appropriate values
4 J8 ?* t6 ?/ ]" yto setup-globals* M2 z% C4 E1 ]6 U
  set current-light nobody ;; just for now, since there are no lights yet" g5 f, s" _" g0 @0 u
  set phase 0! J; y! a( N* ^  E2 I  d
  set num-cars-stopped 0
: ~2 M1 a/ f& }% z  set grid-x-inc world-width / grid-size-x
, `" _3 I* S& S% J  set grid-y-inc world-height / grid-size-y$ r$ {, F2 `9 [5 R- r0 L, X

& B* m9 Q# u5 I8 {2 a- x  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 |/ l7 V  x7 L$ ?* S
  set acceleration 0.099
- h: Q2 C8 J- C) ^) Yend' h0 v1 f# u4 l2 x. E  I6 V

8 V0 y9 l5 n2 C5 Y! U6 x8 _0 u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; G2 b' e7 g. }. o7 J3 U* W* Q$ \;; and initialize the traffic lights to one setting
3 B) n& _' k* q& Q. |! mto setup-patches6 ^+ [& g! B& P/ M4 V9 E1 q# c
  ;; initialize the patch-owned variables and color the patches to a base-color  u& V- m9 G% {& [5 @" k1 \& I& u! t
  ask patches
+ d+ f; [2 p$ q  [) Q7 y2 @9 [4 v
    set intersection? false
# ~4 m* _' V0 n7 m8 }    set auto? false
# v4 [2 j  H$ Y$ S; R8 [9 C+ y    set green-light-up? true
3 g9 @9 C$ }1 z4 p' A- X    set my-row -1
2 |! Q2 x1 l( K5 m0 S; Z8 \    set my-column -1
$ ^) w- K7 u( N, J% V# c; Q    set my-phase -12 G1 u3 R: _5 h- D/ K
    set pcolor brown + 32 @" r, Y# P8 H  F9 K
  ]* H$ ^% R* t& q4 s8 F1 P

( Q4 I: f- U$ a/ j$ E! W: t  ;; initialize the global variables that hold patch agentsets/ P0 e, w- l+ [  |- ~, X4 K" l8 ~
  set roads patches with5 W8 N5 M( ^% h8 H8 M8 w/ q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  w# p7 B# c- L; O. s* T5 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  L+ ]9 O: v1 e- `: c( B
  set intersections roads with  _! ~3 x# ~' c7 |- o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. F( P( X' a( b6 Q1 s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# a( K, v: Q3 \# H4 O9 A4 y" E
  ask roads [ set pcolor white ]
' @% l- Z7 W- I7 s# x+ W    setup-intersections
3 ~# L# ?. C' ]% t' I1 q; Zend
8 \! F3 N- H4 J/ z( _3 E$ i* q其中定义道路的句子,如下所示,是什么意思啊?
1 o0 h% s" n1 ~5 u) z2 d, V set roads patches with3 h$ K1 k, @1 m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& x7 L5 ]5 h; B8 h% P8 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 n8 |) ~/ m/ @$ @+ x# 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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