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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  k# z  L/ L- X7 |) S- F0 o& x) I, wnetlogo自带的social science--traffic grid这一例子当中,1 O2 l* k+ a5 ^2 Y, S
globals
/ f- u6 N* x( q% i: i# {+ e4 \" W[
6 r& g2 z, k% l" N  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# U* P" D( l1 ]  grid-y-inc               ;; the amount of patches in between two roads in the y direction( H2 m6 Z1 S6 W6 u7 G
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ F! E" ^6 Q% z! G  D% |: u/ U# |                           ;; it is to accelerate or decelerate6 U6 b4 `6 z$ Q7 D6 u' X0 Y' X8 ?
  phase                    ;; keeps track of the phase2 h1 C6 R  H/ M
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! o+ N1 U$ R7 Q( g- I
  current-light            ;; the currently selected light* P8 `8 \+ O- g5 `' Y4 m

9 n1 T  _8 u0 j$ _: Z4 J  ;; patch agentsets2 K1 G4 ?* G, @1 z2 X+ ?% \* p
  intersections ;; agentset containing the patches that are intersections
! W2 s& n/ n. Z6 [; S+ N3 R  roads         ;; agentset containing the patches that are roads
3 R$ z) f: O* ^* }]8 U8 e4 y: }+ M: n
' H- h" O8 P; f2 a2 t5 S; _
turtles-own, j7 b5 M9 X; ~/ x9 U2 }
[
! ?6 _9 T# {, X  speed     ;; the speed of the turtle
+ T9 G* V3 b# ]  up-car?   ;; true if the turtle moves downwards and false if it moves to the right2 c/ m' R  i- q4 d' a" n& c
  wait-time ;; the amount of time since the last time a turtle has moved7 t+ B7 L, o8 F  v
]. ?* D8 n; s* l" N6 l
+ x- S9 G8 B/ ^
patches-own
4 }8 S/ p! \: p4 X/ D* }$ T+ n[' @/ u+ V3 X6 D- t
  intersection?   ;; true if the patch is at the intersection of two roads
, s. n. G; b$ s, {$ V& d5 A6 y  J  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; T1 I4 G  m# D9 }% T( s, @3 R
                  ;; false for a non-intersection patches.$ C, c3 {. t5 ~7 B' h9 K' W
  my-row          ;; the row of the intersection counting from the upper left corner of the
! H1 C; l4 ~& e! |                  ;; world.  -1 for non-intersection patches.) b/ f6 z/ z' z$ }+ o; y
  my-column       ;; the column of the intersection counting from the upper left corner of the; u3 I& \8 |$ |. l" v3 y1 w
                  ;; world.  -1 for non-intersection patches.
# y9 f/ i$ b+ L) e, t0 R  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; _6 n+ X' }9 ~* q4 ~  auto?           ;; whether or not this intersection will switch automatically.6 i( a& H6 e& N% ^
                  ;; false for non-intersection patches.  p7 Z% \& y3 t: j  X
]
7 f7 D2 T1 G# K( w$ Z4 S" s! _$ e3 }
% b: m. k  k2 p4 I
;;;;;;;;;;;;;;;;;;;;;;3 o' t! S) R( a- a8 E
;; Setup Procedures ;;
* v6 b) c  [) b: [;;;;;;;;;;;;;;;;;;;;;;
* {4 G) Q9 b* t0 k9 |  I, q; t7 @5 O% B; a$ }5 T. g5 D
;; Initialize the display by giving the global and patch variables initial values.
# n. k) o$ p5 X4 _0 D) I;; Create num-cars of turtles if there are enough road patches for one turtle to# |9 G! W' U' u' i& V
;; be created per road patch. Set up the plots.$ k& i7 B; D0 s
to setup
7 u0 J) \" F7 h# S; c$ E  ca
% N) A" I7 b/ ?8 `5 N% @* f  setup-globals
- E2 ^! v. `3 }& f* r- }# D5 S3 O. ~0 O
  ;; First we ask the patches to draw themselves and set up a few variables6 N6 s* I8 ^+ x% L; ]2 d* |! \7 N
  setup-patches1 P: e& ?) x$ g5 c$ U, U
  make-current one-of intersections# h5 g$ K+ G: I6 G0 c# D, w/ @( N
  label-current+ s4 `' P* B/ ?, i( P  s
2 W7 ~( y* [# k. Y2 C1 B1 r
  set-default-shape turtles "car"4 ^" n' m* @- G! ^2 U/ @% q
4 B( ]7 p* y6 t
  if (num-cars > count roads)
& m* `4 r0 ~) V# X  [
# \( w. ]5 i' G    user-message (word "There are too many cars for the amount of "* z- i! M' E$ L# B2 N9 o" C+ F% d6 X5 E
                       "road.  Either increase the amount of roads "
7 n' a8 a" }  @- z; X; W                       "by increasing the GRID-SIZE-X or "
# m  |+ m. c- i( p: w( F                       "GRID-SIZE-Y sliders, or decrease the ": D( c: [" S, B
                       "number of cars by lowering the NUMBER slider.\n"4 Y% f4 g2 J. |/ ]" \% M' y& s
                       "The setup has stopped."), Z" X0 p% k  f% M$ B
    stop+ B9 C7 w5 m* G- G6 R  a% U# s  i
  ]1 s' G& H9 U, V$ i: E0 G

/ {* H8 U0 y6 @  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& o- ~+ X( l( u. @0 Q$ t
  crt num-cars: `8 f3 h/ K7 ]3 |# ^
  [
7 A8 g" m3 E% h) V, Z    setup-cars+ n9 L/ D. W- ?( R$ |) }) i
    set-car-color! b8 M5 J* d" H4 Q' U& M
    record-data$ Z; F. N: [5 s+ p+ n  y( T
  ]6 S# l+ ?/ _2 R  N: f

% K3 H$ z4 s" S$ p  q0 t, Z  ;; give the turtles an initial speed& S; f* ?: T2 f$ {: n6 s" _
  ask turtles [ set-car-speed ], `9 O0 x. M) V) w( \! Q5 @
: H: n& y, t% o1 c/ z# v
  reset-ticks
' \6 |% m$ g" [  B1 j4 W/ eend
5 l2 o) M2 s% i% c
# o% W$ s$ {; c- i;; Initialize the global variables to appropriate values( A, d0 h9 G* @) C. s$ }
to setup-globals
/ i" W% T6 p6 O+ c) u  set current-light nobody ;; just for now, since there are no lights yet' I$ s/ _6 d1 I7 e9 s
  set phase 06 {' M5 |& c# p3 F
  set num-cars-stopped 0
0 i4 q1 E; n5 Y+ Y! {$ @& L  set grid-x-inc world-width / grid-size-x
, e+ F& v1 l6 a0 b- ^; c" A  set grid-y-inc world-height / grid-size-y7 ^& R2 y1 o8 w7 N& p. @

8 P) Q4 l5 Q( Y6 G$ U  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 N' s, m( c* q( P( u4 }" R7 x8 n  set acceleration 0.099
2 G3 P- A, E, _5 u6 O; pend9 [0 c- Q; ~) a: ]7 v

+ I5 P+ z4 C5 }. W;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' x- ]# x( ]( ?9 W" v1 k
;; and initialize the traffic lights to one setting
! K: ]1 q' d5 kto setup-patches
1 _9 r" N4 `" c  ;; initialize the patch-owned variables and color the patches to a base-color) I! c- n  ]9 F/ }
  ask patches
: t( l/ h- o  |1 v# f" C  [
2 C! E- O2 K5 N6 `- z    set intersection? false
" ^8 K$ _- b) u. k: O    set auto? false5 `3 p+ G7 Z- Q! }: M
    set green-light-up? true0 r- k4 T% W; h9 k0 e5 k8 R6 d
    set my-row -1
; s/ A' v; V7 }& _. p5 w    set my-column -1
# ]/ l% B* G6 R/ P4 r# S! e6 o    set my-phase -1
6 F) X& p' ?# K! a, K! a# R8 w5 C    set pcolor brown + 3
, H( Y- s0 s3 F( M# F  ]5 g8 X# p/ t* G1 P: f/ T# v" c- \

9 ?( k6 p: g5 W  ;; initialize the global variables that hold patch agentsets$ {. o7 e) Y. c8 H* e0 y+ u
  set roads patches with+ I8 [, w- \' f+ h
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& r/ b8 s# W2 M9 y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% j& q  n# q3 t: R2 P; U2 ]3 F
  set intersections roads with8 P& u8 q3 r  a7 j* ^7 g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* B# `- U$ K9 d8 ~2 _, r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 E% ]; X4 m( y6 K+ J: k1 H/ D7 L; k6 A9 E( u; P+ J
  ask roads [ set pcolor white ]/ F9 m) b& M  {! o9 g4 Y, {
    setup-intersections
# q" E7 ]& D! g3 aend
0 K- k9 N1 g- s6 k其中定义道路的句子,如下所示,是什么意思啊?
0 p/ g; M6 G% P9 V% K( L9 g8 y set roads patches with
! T' v. _: d3 g7 J* `  S  O: D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; Q* D9 c8 G5 z. i+ V2 A9 z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ |0 |1 t, y$ r" F4 `: R3 z& b9 e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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