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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。
" J# \/ F( y' u' V  ?4 Q) l5 bnetlogo自带的social science--traffic grid这一例子当中,
# h& ^! i$ u3 v- y* X  A/ |! Zglobals
' `' m% ]' b2 I& x2 J  F[. ?. q* E/ d$ s5 _8 @6 ?8 |% N* B
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
. M& h* y+ t, o$ D  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ b+ O3 ?8 J) m" M0 [5 F2 ~* S
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if7 X6 @7 j# W; z  r! s( m2 n/ [' {
                           ;; it is to accelerate or decelerate& R  j6 p9 @4 a* o/ c
  phase                    ;; keeps track of the phase& U- G; l- J% m
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 u4 o+ Z7 e4 l( o. i: y
  current-light            ;; the currently selected light
1 z& D; l% I" B$ I  j: H% z
' i1 {' G* g9 m/ Q  ;; patch agentsets
8 Q  x( x% I% f2 ]3 Z1 H  intersections ;; agentset containing the patches that are intersections  i* j) W- {  g+ z* E9 S/ m
  roads         ;; agentset containing the patches that are roads9 |% x) N7 i5 p4 ]% T* R7 X; Q
]
; ?+ J0 B& r& V- M$ g; d+ Q
, [( @: @% A* ^+ ~8 q' @turtles-own
" S4 h- _0 h$ e[
# @, A& E) L, E0 j- p  speed     ;; the speed of the turtle
! [# q$ Z& a& W7 J5 t  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
: q* `  P" A: F  z% Z  wait-time ;; the amount of time since the last time a turtle has moved% H" W. ~" `8 F/ J2 e* _+ S
]
% M( B; p9 }+ @+ c3 v- f, W2 N7 E; {% J* w- A, l
patches-own' `4 G% z: u! @" C
[9 o7 t3 L5 F) K) t; B8 `/ W
  intersection?   ;; true if the patch is at the intersection of two roads5 \( F) N: B) K8 o
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* N. G2 U4 G% L' d
                  ;; false for a non-intersection patches.
! W' Q% u) X3 J# ]  my-row          ;; the row of the intersection counting from the upper left corner of the
3 ^* s% F% u6 Y2 S8 H# q1 n                  ;; world.  -1 for non-intersection patches." p# x0 F* O0 i3 o
  my-column       ;; the column of the intersection counting from the upper left corner of the
' c5 a- i# R  K* A% X6 z                  ;; world.  -1 for non-intersection patches.; j( v$ t6 ?) {+ g& s. w' T" S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.4 C, T% q. o- G9 g$ d: C# \
  auto?           ;; whether or not this intersection will switch automatically.
1 v5 L3 g& X- e4 Z) A! f                  ;; false for non-intersection patches.3 b1 _1 S! D8 p: W1 ^0 ?
]% {. t' A  ~9 q* s; e

5 g1 n& g7 v" @- y8 z& ?& s
( K$ S: d! r* Q/ H2 j$ Y& E. ^;;;;;;;;;;;;;;;;;;;;;;. X+ @) u5 a7 |8 ~  a6 e" y2 J
;; Setup Procedures ;;
; H: [! x3 m2 [4 |4 O$ Q, h% }( ^* j;;;;;;;;;;;;;;;;;;;;;;! q2 R! w0 l8 M# Q

2 p0 t2 l" ?, M;; Initialize the display by giving the global and patch variables initial values.- Z/ U/ \) ?4 \/ l3 {: F
;; Create num-cars of turtles if there are enough road patches for one turtle to
& Z* w, ^5 S" D4 ~- `;; be created per road patch. Set up the plots.
4 S/ N7 w. V5 b% |( z& ], z/ ato setup! e# ]9 ~" y" \" \( D/ _/ f" X
  ca
: r! m" U/ y7 @  setup-globals) X" V; ^% @+ t( A% i# H  z

# Q6 ?6 F+ S" t1 E  ]7 F# D  ;; First we ask the patches to draw themselves and set up a few variables
' R$ j- q+ t1 |3 I7 X7 n4 y: g" o  setup-patches
+ E; Z2 R  O0 y- I- ^  make-current one-of intersections, _) }) F8 W) G; w1 s) Y8 j+ O
  label-current
+ D4 m. }& x7 X8 k% E% j! w2 }. [% J$ q& o1 q7 Z
  set-default-shape turtles "car"
! }* Y1 @9 ~, B- A& y! s) d8 y- i! t1 u8 d* x: H4 S& K
  if (num-cars > count roads)4 T" Y* w4 I% J( Z
  [; A) s$ e3 b  D3 b0 F6 B9 c4 H0 M* o
    user-message (word "There are too many cars for the amount of "
3 J  H& r& i' e3 s3 a                       "road.  Either increase the amount of roads "
' k* k  A$ G- U3 n" A                       "by increasing the GRID-SIZE-X or "+ J0 }7 L# ?+ t0 E
                       "GRID-SIZE-Y sliders, or decrease the "
6 b8 L9 G; ?) f% {- t                       "number of cars by lowering the NUMBER slider.\n"
' ^/ D$ w. r: j& g) h4 _9 U                       "The setup has stopped.")- g$ C: w* A: h7 W6 E
    stop
# f! W( H# w  e. T& _  ]' p4 |( z0 J5 _9 m

1 \$ ]5 W: W, l  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" K3 d5 n* Q$ D' H3 j
  crt num-cars5 ^, F0 N' x6 c% @4 U
  [% O* J# {4 v2 K% B' ~+ B
    setup-cars
1 W; R1 P; @$ W( e6 y: J1 h    set-car-color1 [0 O8 {1 c$ j! w* |7 n3 d( I: i
    record-data4 c; }5 E* n; N4 z1 T6 A' l
  ]% R( J0 Y6 E, B' _/ ?5 s/ \

- E2 x5 e. W# F5 b. g6 J  u2 r9 H  ;; give the turtles an initial speed* Q  A2 s8 O; x- ?; a- o
  ask turtles [ set-car-speed ]
& `0 H  I3 w8 P* x9 [, }  O3 l6 o! }
  reset-ticks
# d/ M2 o) R5 ]) d, G2 {7 S' x5 k% Eend
' e* U2 C# b+ f- T+ v
* d$ v- L5 J& w;; Initialize the global variables to appropriate values; E+ B' ^1 D5 ]- E( B6 S8 X" Q- c6 y
to setup-globals9 f; f7 `% g" Y1 V
  set current-light nobody ;; just for now, since there are no lights yet
+ I3 x5 r& ]: h* Y' g3 m- S7 `  set phase 04 d3 i9 ]+ x9 Q( H$ x
  set num-cars-stopped 0
# |- u3 h; J; \- k6 \  set grid-x-inc world-width / grid-size-x1 v' N! h; S' `% O. Q* @$ [' u  i
  set grid-y-inc world-height / grid-size-y( O; D( d/ }) T
/ d+ c/ C9 u6 c0 @
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* O: D2 H, [% g9 \
  set acceleration 0.0992 u4 i6 r* Z% O/ z& d6 {& }
end% n, A. r  Y. t. D; \$ n

8 n7 N- Y; {5 J, y# b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 p# L+ a4 E( C' y
;; and initialize the traffic lights to one setting/ W2 b, ^3 A) V, [9 t) l
to setup-patches4 a; G$ E# i" m% E# l
  ;; initialize the patch-owned variables and color the patches to a base-color
# u; y& b  o' k4 ^5 z3 }  ask patches
( D4 v) s# n$ x5 E  [
. N3 j6 V% m/ Y. t    set intersection? false* j: j" V6 I" t# H  C. {. c' R+ L
    set auto? false' t! ?  X/ h: d. o, h
    set green-light-up? true
+ j) [1 z) {2 ?8 g0 c; u    set my-row -1" |; }  `4 Q2 G7 O# M; D
    set my-column -14 P; Y0 w! \% o# S8 p
    set my-phase -1
6 ?% a( _9 z) x4 @( W8 X6 l- @, x, C    set pcolor brown + 3
% _# G$ d. E$ E7 D0 M7 g2 s3 v2 Z, X  ]
  w- i% W8 R8 _9 X7 L
; s; I  i3 J6 o7 ~$ q/ G  ;; initialize the global variables that hold patch agentsets5 i) R# U$ G1 _
  set roads patches with# O' Q: H6 ^- q! F$ n! E$ X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 Z1 Q, q- X  n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" R, ?, \7 e' @) E  m1 ?
  set intersections roads with! `9 v, M7 i  R, b# F& @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: V; B$ q+ X: W0 n1 q$ ?) y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- Z7 ]4 Y* E+ @3 O6 d, S. y+ K9 T) A7 O) E3 ?- k
  ask roads [ set pcolor white ]
' r" \) V6 M2 u" P/ n  A2 O* b) w    setup-intersections
9 Z3 f# A: `6 ~9 ^1 oend
) v! W1 O2 M- ?4 r# i+ x其中定义道路的句子,如下所示,是什么意思啊?
+ s; X0 x" X$ A  W3 G set roads patches with. K- X8 c5 P5 P/ ^5 B. d1 \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) v( [0 E5 v, b2 {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 K" h8 f, L  i) z. K
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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