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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" W, K+ O5 Y3 V  anetlogo自带的social science--traffic grid这一例子当中,
7 {2 b4 s+ w& X/ }$ _+ a* }/ |globals* X' X. p" N, D& T' n1 i
[
  }% {6 D& i) o6 P8 h9 e) p  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 X0 _  O" C3 |/ ~; A9 U# R7 M2 }7 Q  grid-y-inc               ;; the amount of patches in between two roads in the y direction
  F' h1 F* G, E0 ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if5 W& o5 Y. u9 N8 d
                           ;; it is to accelerate or decelerate: N& N2 Q" X, b) u1 u
  phase                    ;; keeps track of the phase, X) J0 u" h9 |1 w
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 Z( v1 W7 |. S' a9 T  current-light            ;; the currently selected light
. m; `  \% Q9 r6 n( W( {2 R, Y% I' v; u% S$ Z, A
  ;; patch agentsets/ {" S) E& U9 q  T. K# f  }
  intersections ;; agentset containing the patches that are intersections" ?6 R6 m* t. `$ D1 P. m  ~: M/ V
  roads         ;; agentset containing the patches that are roads; G9 I0 w1 w8 N, r
]
- Z, t! z2 z  Z; {6 _9 w
/ B, P' _/ e  a# i9 b6 Q4 nturtles-own+ g+ g  F" t( Z/ d8 }
[2 o; L+ _6 B7 `$ Z; p3 I
  speed     ;; the speed of the turtle
; }$ i8 u( ]1 q. h) a4 y8 X  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' L; Q6 u6 Y9 b3 w9 Q# A
  wait-time ;; the amount of time since the last time a turtle has moved$ h$ k: p. v7 n2 U
]
$ Q7 O$ ^! P( h& f1 ]  L, D# {/ u2 Q6 ^+ T' c4 v
patches-own6 W# t. H9 Q8 v/ X& E5 [  a& T- I& C- i
[
1 K3 a4 ?6 q+ ]3 b; ~  intersection?   ;; true if the patch is at the intersection of two roads
& [. s+ i( z" z3 E1 |  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.% @: w+ r1 w! m6 p1 L1 L
                  ;; false for a non-intersection patches.
) T4 R5 g' n( V  my-row          ;; the row of the intersection counting from the upper left corner of the
+ [3 C) z% o% _2 y- V+ l                  ;; world.  -1 for non-intersection patches.
6 r2 c# N: x! g$ _  my-column       ;; the column of the intersection counting from the upper left corner of the/ ~: L# `. Q6 R' z
                  ;; world.  -1 for non-intersection patches.
' N( ~# F! G0 m  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; W% w, k5 m. ~2 [
  auto?           ;; whether or not this intersection will switch automatically." v% ^- O( x2 Z8 W) ~6 _, L* r" C
                  ;; false for non-intersection patches., ^4 y! k! E8 g; D+ Q
]
2 o8 m, f4 P& g0 P* q- M& `$ E/ E% i3 m

( U5 \; b, t! z% n/ ^& A;;;;;;;;;;;;;;;;;;;;;;0 y3 n7 r1 w- E3 h; C; G* b$ q) L
;; Setup Procedures ;;. C$ L* _& Y0 ^0 r5 Q0 Z
;;;;;;;;;;;;;;;;;;;;;;
. s) }' g* j$ e; f4 r& B6 G7 s4 A$ O: r; `
;; Initialize the display by giving the global and patch variables initial values.
0 B' l% A- I2 Z1 ?2 ]" U;; Create num-cars of turtles if there are enough road patches for one turtle to
% ~8 X) X; M9 Z7 t! \  G0 Z6 X6 T;; be created per road patch. Set up the plots.  F  a$ j' I4 h: u
to setup# Y  |( ?. w) C! S5 F
  ca
* J" Y8 D: q6 f+ \0 D4 l% s3 c; Y  setup-globals
, c: x* y& b3 ]# b: P& Z* \
/ m9 V# V# Z0 S; |  ;; First we ask the patches to draw themselves and set up a few variables, q- Z) {+ X  _, G/ v
  setup-patches
: t# f/ [$ A; f' v- A( A  make-current one-of intersections+ J; S; e0 T  p3 Y# @, U
  label-current
6 J' b6 C" e2 m  t  Y
5 c* I5 o! ?! C; ?: Q+ P% {& r% g  set-default-shape turtles "car"0 K' y5 a# H! ~

6 r, T* P  Z+ e, m/ }, F  if (num-cars > count roads)  E8 p" n7 w0 W& b! x  Q3 }+ \7 u4 r
  [
7 g! |3 m. B, H$ F5 ]/ T5 r6 \  j    user-message (word "There are too many cars for the amount of "
- t& c4 U& _4 _                       "road.  Either increase the amount of roads "
* M5 o  M* J/ d) G! e                       "by increasing the GRID-SIZE-X or "" C* H4 x: l) d, n9 z2 i% ~7 [) Y2 R" u
                       "GRID-SIZE-Y sliders, or decrease the "  C9 ~' d+ j7 l* k! X; F
                       "number of cars by lowering the NUMBER slider.\n"; E" g$ t* K$ o
                       "The setup has stopped.")7 K* B- S  z3 K  d. k" Y* b: w
    stop; U- ?6 n4 V* F. @
  ]
9 H  z  E# q7 b1 R7 c* b; Y
  t1 i0 z# k& b3 A  ]9 G" S  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 ~) u' V& @5 ^5 V+ j
  crt num-cars; D* a2 R0 V2 h) Q8 i
  [
& d" }( V; M  G2 g    setup-cars1 q( t: Y3 |& V4 x6 w5 Z# ^
    set-car-color- J+ `7 C1 @+ W' t0 `
    record-data# o1 S" z  b7 p0 }: J6 m
  ]
8 E0 G+ O, E; x6 ~* n6 ~! r& B! z' v' N, b$ _
  ;; give the turtles an initial speed# y% z0 f5 }0 ^6 m. W+ T
  ask turtles [ set-car-speed ]# i! _! l- F' Q! W
) Q( ^8 F& a3 R5 F7 Q9 z
  reset-ticks
+ s3 B; m, j& |1 yend. G" C$ k% S; u0 d* b# C$ k

' r0 _1 v& [5 A+ {( u;; Initialize the global variables to appropriate values
# N: A. Q* y9 l  y- sto setup-globals
9 f! T. h- ^3 I0 k4 b! o# y, c  set current-light nobody ;; just for now, since there are no lights yet  v& o( l! _7 T' p. Q3 H
  set phase 0
! T2 U* Y5 ?3 j5 L8 d) }5 c8 a6 b0 h  set num-cars-stopped 0
9 c9 K; G4 n: \$ e$ n( s  set grid-x-inc world-width / grid-size-x% Q- Q, i" U. H4 S6 b9 Y9 k. I
  set grid-y-inc world-height / grid-size-y
9 ~& i  _, q( U% h' z7 v5 A( C% w! H4 e6 j
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: e) K" A$ g) R+ c" P
  set acceleration 0.099
, ~4 j. `  `" r1 s: uend' f. j# Z' T, [# c8 N

  C6 T" Z7 Y; l3 @;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# L3 Q* z0 D' K- w5 a0 z7 J;; and initialize the traffic lights to one setting( p8 d3 b$ L, ?: f% p% \
to setup-patches6 ?' H2 @$ N  n' h% u5 X, N
  ;; initialize the patch-owned variables and color the patches to a base-color0 y# F0 L& V$ g& r* E3 ]3 g9 [
  ask patches
$ Y& g) `/ a. S0 ^! e; L) h  [  c* k  I0 {7 d$ {& t: V
    set intersection? false* Y1 l1 ^/ B* D; F6 _7 {+ J$ T
    set auto? false
& B  U7 G8 D  D: Q4 v    set green-light-up? true8 }7 |- \2 h0 F5 r+ |7 i
    set my-row -1* x7 W* |8 K7 t' I8 W/ V6 Y+ y/ k$ ?
    set my-column -14 H+ X% e- P( A
    set my-phase -1. j3 d7 \/ p8 D/ M% q- Y# h) [
    set pcolor brown + 3( I+ ?9 w1 S$ l6 }4 S6 ^
  ]1 u6 R' [& a/ |- O' [/ S! T
6 G  P* l4 U; P$ i1 g
  ;; initialize the global variables that hold patch agentsets, n* ?% q/ f, O4 P5 j
  set roads patches with
# c4 v1 e8 V: i1 i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ F, g: D# r! e8 \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 ?  c8 K& ?# G) h  set intersections roads with
1 i$ p9 E, K9 r1 s) C6 A, D  t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& ?9 T2 }: w4 q; ?9 T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ M+ L: A0 P7 B/ g; q1 J8 n
$ g# @% }; C% ]" W5 U
  ask roads [ set pcolor white ], H0 _! b* G) {7 z. v
    setup-intersections
& q9 z& u: i, o6 M( C: \8 Y( C/ Rend
2 l# g5 o# T0 M$ K+ \, ]# w其中定义道路的句子,如下所示,是什么意思啊?5 a  i5 ~3 \& f0 g' P% O& Y
set roads patches with+ r6 u; C/ R+ v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 x# Q+ ]; m: N5 x( J2 P# [- u
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' y( {5 `3 Q! I9 D: ^# U- s1 g
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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