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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。
$ D7 \; S* d7 x% Enetlogo自带的social science--traffic grid这一例子当中,$ J, a# Z( b; C0 ~5 l% O
globals$ w% Y" W! m0 u: U& ^. @
[
' Y; O# N$ i  _" ~* U  grid-x-inc               ;; the amount of patches in between two roads in the x direction
% e, `6 G5 e: C$ X& \  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ c* Q1 T1 X- g
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ {; A  ^! G) \                           ;; it is to accelerate or decelerate
0 G) c7 m) ^1 j/ ?& ~" @  phase                    ;; keeps track of the phase. v  i# B1 b/ F! D$ x1 \0 Z5 D
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ O7 F% h0 [$ o6 o, f/ z7 {
  current-light            ;; the currently selected light
5 p# Z* p$ _# t- K+ u
( _" G+ t& g" D0 l- C0 X  ;; patch agentsets
& K$ h! _8 c8 u% O% J  intersections ;; agentset containing the patches that are intersections: A/ k4 K+ b' z- K2 D) t
  roads         ;; agentset containing the patches that are roads
1 f/ Y6 N" ^/ Q' r% O]6 b1 m+ K7 {, k5 Q& x& N) s
3 Z/ F' x0 d: m* C% `
turtles-own# n# t  A) p9 k2 j
[
+ D3 o) W" m! g; s! E/ d& Y/ f, |  speed     ;; the speed of the turtle) i7 r8 d6 Y/ m% N9 f$ |
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 Z+ e7 e, y6 V# e/ t4 E
  wait-time ;; the amount of time since the last time a turtle has moved# t7 W3 g/ W/ K, d
]$ Q: l$ d3 o) t  m4 x& ~
# h9 Q4 z. d0 Z
patches-own
$ `2 w7 o! E3 ~% A3 j[
  W: i0 k# }1 d( g1 V" J5 Z  intersection?   ;; true if the patch is at the intersection of two roads4 ^7 I* s$ ]* m, g4 Z& \6 G
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 u- h, T+ P# ^4 g                  ;; false for a non-intersection patches." Q: D! f' U& Q+ [
  my-row          ;; the row of the intersection counting from the upper left corner of the) K: ?8 |0 j9 W
                  ;; world.  -1 for non-intersection patches.
+ L9 P2 W/ U2 ^$ v& M  my-column       ;; the column of the intersection counting from the upper left corner of the
$ o( q6 K0 h2 `7 H; k                  ;; world.  -1 for non-intersection patches.# O3 t& Y: z4 Z( v: H( n& J
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.+ g0 |9 L5 {9 d; e
  auto?           ;; whether or not this intersection will switch automatically.
% {1 _9 G, `; E6 B                  ;; false for non-intersection patches.
$ B0 o+ K) w5 V+ @1 r]# |* a$ P7 k5 J/ p) ?% v
( _# `" T+ X1 j$ V6 t
$ R+ Z6 G' t% u6 V0 F* R  g) B
;;;;;;;;;;;;;;;;;;;;;;
1 H5 b% M8 u" ~% `- x7 [2 Y/ {% S;; Setup Procedures ;;
& A; n* x& R2 E7 z;;;;;;;;;;;;;;;;;;;;;;, ?4 a" v) {, m' ^8 m) d+ i" B# e' [
: |8 z! L3 v  P) B" Y
;; Initialize the display by giving the global and patch variables initial values.
  F( R2 W% M6 a. V/ j" d: g  u;; Create num-cars of turtles if there are enough road patches for one turtle to
6 D8 \: T+ s: x. p# z4 g;; be created per road patch. Set up the plots.
% {2 @( B, Z6 V# x. n2 F- Tto setup
4 `  b! Z9 r% @. Q9 }" P  ca
1 U* N; f$ V! F$ }: O/ f8 n2 `9 D  setup-globals3 U* F6 `5 @# `

; d# e1 m* r5 m1 {. Z+ s( y* k  ;; First we ask the patches to draw themselves and set up a few variables
6 A+ k& p+ q; C  setup-patches$ q# e2 }$ Y6 W- D$ P
  make-current one-of intersections
, Q+ Z) p- `! S1 v+ f/ X  label-current' ~. z8 Z' t4 e% t

8 k9 B" E6 V- B" V9 U0 Z8 j  set-default-shape turtles "car": }: s$ ]0 F9 b; _$ A

- J! b, b4 z! c  if (num-cars > count roads)+ Z1 \9 D/ X5 g3 [5 \9 g9 H( E% i
  [
, c& [) T0 k# A) r    user-message (word "There are too many cars for the amount of "
) n* b. a) e5 o7 @2 @; T                       "road.  Either increase the amount of roads "
! j( w. F9 `* B& b2 d5 \6 t                       "by increasing the GRID-SIZE-X or "! D( d! x/ p4 T8 I* _
                       "GRID-SIZE-Y sliders, or decrease the ". q/ X2 j: c  s) e$ u2 C
                       "number of cars by lowering the NUMBER slider.\n"
3 X6 a: u) t' A& I+ {, p" Q8 S                       "The setup has stopped.")
8 ~9 R- o1 q* Y9 t6 h2 F" f    stop( v: F/ |) u& w+ ^
  ]
& F* R% G& b, b5 P7 s6 z: O
, v& L5 I0 i0 l  q- o0 e, H2 ?9 i  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ |: r- a( v- e6 f- G" B  crt num-cars( d4 r2 Q7 m; M, f
  [! E" W) ~- t& O8 c1 f) q
    setup-cars% \+ G$ g: H5 ]* k7 n
    set-car-color) ?6 _. A" m# X: `7 J/ ]: v7 ?; o# t& y
    record-data$ }5 z/ Q# S7 y1 ^' x
  ]# s3 n+ S# p5 q
' V& f$ U! ]# ^* Q& G; k
  ;; give the turtles an initial speed
- A' E; @8 T6 f1 d! ^. G  ask turtles [ set-car-speed ]
. I; {" o; v4 Y- j! d3 K/ [1 Y: w9 i& _. p: u$ q: c7 Q5 ~# ?
  reset-ticks6 o& y! m- P! ~! b
end7 t# N+ E& q$ w1 a4 _( G

9 I6 ]! t- I& c$ t: _;; Initialize the global variables to appropriate values
8 v3 c! x1 _  P2 Bto setup-globals1 r. L/ Y5 Z0 L& e# T( M& r' J
  set current-light nobody ;; just for now, since there are no lights yet
# N* @+ h/ K2 `4 y+ t5 k9 R' z  set phase 03 y$ B$ `7 {9 ^% {( O5 w
  set num-cars-stopped 0
9 f& W$ C' M' e) b  set grid-x-inc world-width / grid-size-x
' p3 N* v8 J: R, @# S  set grid-y-inc world-height / grid-size-y
2 x1 S5 b4 ~& b, c5 B" i, p- k
7 h6 Q1 |# j! G( V3 u: _- g  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; i" g; {7 R  z1 R& U6 K  M  J6 Q: y6 P  set acceleration 0.099
) d0 t- Q( {0 d" C$ f# Q5 e: send
7 T/ |; f( \  Z/ Y0 X7 `+ |$ G& |% n' z. ?& X- I
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ c: w0 a- m4 `
;; and initialize the traffic lights to one setting
" j7 ]* Q" h' e& J; |( Oto setup-patches
3 N4 k* h+ Y; d0 w  ;; initialize the patch-owned variables and color the patches to a base-color
) E8 i5 M4 H; E# C  ask patches5 [3 Q& N5 N" b+ ]0 G
  [7 ]: q* k) e2 p. T0 R% A* G. k: ?
    set intersection? false
3 {& z8 e$ u* A: h* W    set auto? false
' D' Q$ m% h4 D* _    set green-light-up? true
2 s  f7 H2 I! d" O3 R9 `3 ~+ }4 ]0 a' A    set my-row -1
9 V- \8 w5 C$ ~  y0 _7 L    set my-column -16 o# }% ~* ^' f  b2 O
    set my-phase -18 I) z! I5 H+ o8 o/ S* y5 j5 L
    set pcolor brown + 3
+ Z. M. r2 t# T' p2 b7 Z1 [& i" @  ]
4 A# a  r, T" d" P- f, u" c8 ]% e- f% ]4 U- h9 e! }
  ;; initialize the global variables that hold patch agentsets
" {5 M) D. S5 ?, L" m  set roads patches with
' T! T0 {) r1 `0 \    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 J- {& T  n* ~! q5 C0 F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 l, i, |0 u. H$ l  \8 d  set intersections roads with0 q+ t8 @# y6 g! v) u0 T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! u+ ?1 {. r0 ?: }* r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# n! D5 i; ~' T$ @2 R' v6 @! F
) b) Y4 ]" ]. k6 b/ A
  ask roads [ set pcolor white ]
" e& q: u# d2 l/ |' D* e    setup-intersections
& l* i: q2 U3 M( U5 J- Nend
, F3 ?' |1 U( a/ m6 j% t7 `& u0 {; Y其中定义道路的句子,如下所示,是什么意思啊?1 L" c( J# Q7 Y' l" j, o
set roads patches with. X2 R) }; w& z1 t& _# _. o. V8 {7 s) ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( M/ l. g! V- M- D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# _7 n. \6 R  o2 q6 }* v2 ?* J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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