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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。
5 ?9 P2 ~0 e4 w$ [! `, |, Vnetlogo自带的social science--traffic grid这一例子当中,
/ o2 Z' b1 P4 F+ J7 Y- L- }globals
9 b, J0 d0 ?3 v0 i" f  A. s0 ?2 @[. k: P5 |  \% m% n
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ R; S4 j+ p) G( @" C& `  grid-y-inc               ;; the amount of patches in between two roads in the y direction* Y" J) f, u7 w5 u. `; f, k
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: V& Z7 f  `" X( _3 Y) p" g
                           ;; it is to accelerate or decelerate
# S' j) ~% v! f, v  m  phase                    ;; keeps track of the phase/ m8 t6 m* B' m  W* {. k# V2 ^1 p% R
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- \' j4 _: ~/ a9 d3 F1 [
  current-light            ;; the currently selected light
. C1 E. J. ]4 v0 X4 S* v  X  n5 l% r2 d- m9 x5 o
  ;; patch agentsets
, f5 r' f9 ^8 |8 e6 |" L* c  intersections ;; agentset containing the patches that are intersections" s4 F* o( N- F2 H
  roads         ;; agentset containing the patches that are roads' ^2 Q* C8 I4 q  M7 s" O# T
]
# n3 R4 e0 Z2 B9 U0 R7 A  w
$ N6 C; u" |3 B" s: A% Dturtles-own4 Z, f& c9 r4 y+ ~
[+ a, n. X5 u' ]2 c) U
  speed     ;; the speed of the turtle
$ a- n' n9 H, _& _) w  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- p  ]" n" e; s5 I% a3 C0 r; [  wait-time ;; the amount of time since the last time a turtle has moved% p4 U/ h3 J+ m& y% L) D
]
9 o( u' h  b( g, _
% j! f8 J5 ?6 G- Opatches-own
' ]: L6 t$ N# r* O6 O6 f[
* V  L+ _7 s: S, _& E. z  intersection?   ;; true if the patch is at the intersection of two roads5 }( A; |, v. @" M& }* ]6 ~, J
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ \- g+ u( `* u2 ^. ^) P: R0 \
                  ;; false for a non-intersection patches." c( S6 K' A9 u- S% Q
  my-row          ;; the row of the intersection counting from the upper left corner of the
$ Z) N4 H& {/ Y3 U3 M, V* I                  ;; world.  -1 for non-intersection patches.  I. ]( J7 ~: F9 i$ G  J: }
  my-column       ;; the column of the intersection counting from the upper left corner of the( c" F. J& h2 T
                  ;; world.  -1 for non-intersection patches.; U4 A* I  \2 t# F3 n
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.: c  f* n( M5 c1 G4 B& k7 V+ u8 U
  auto?           ;; whether or not this intersection will switch automatically., Y3 Q, ?- _3 }
                  ;; false for non-intersection patches.; q7 A- v5 l# L& d
]+ O( X; t: A3 d5 Z! k: `
: Z$ i# ]2 D. g; @" A( g
3 O% {3 o, X# J8 X  v# g# [
;;;;;;;;;;;;;;;;;;;;;;
; n3 j/ R3 z, a' S' Q( r; R; [;; Setup Procedures ;;3 r0 M; f  D7 q1 q+ g& J
;;;;;;;;;;;;;;;;;;;;;;  k7 k2 E; F9 N5 v; U0 }- Y

1 u/ ~2 }7 `' v& L" s( h* A;; Initialize the display by giving the global and patch variables initial values.4 D& w* k' t( U+ V* G9 O0 q7 H
;; Create num-cars of turtles if there are enough road patches for one turtle to
* p: t' n- s4 {6 A; e. X7 E5 y;; be created per road patch. Set up the plots.
: @% f1 B0 r) j) K+ I2 r$ Eto setup
9 f  ~: O# i) f7 v+ \  n  ca) q$ e7 p. G1 [3 m* _1 q9 ^/ m
  setup-globals4 _; Z2 y, [! p8 |0 g8 j- Q( [4 k

0 g+ u2 H* k" e+ m; r$ K6 ~* B' e  ;; First we ask the patches to draw themselves and set up a few variables4 l/ S% X$ i( o; z3 E
  setup-patches
2 ~$ _. ?, S1 O7 c9 Q  make-current one-of intersections; A! Y) Q4 X8 J; S) o2 e2 y
  label-current
+ v  n  Z( u8 V* x' x1 {1 O- n0 |8 B8 H
  set-default-shape turtles "car"
, \& n- n$ ~2 v4 u
! G2 G" V6 d4 Q# V  if (num-cars > count roads)! G) m9 L% K6 R& r) o  T2 o. j5 l
  [  Q2 O% b7 z+ u; z
    user-message (word "There are too many cars for the amount of "6 P( i6 j' m) o9 A1 \  P, }$ Y, k
                       "road.  Either increase the amount of roads "
/ p4 ?% H- ]  T4 `% m8 Z                       "by increasing the GRID-SIZE-X or "
# S3 i$ ?' e1 n! y: c8 r) P' U                       "GRID-SIZE-Y sliders, or decrease the "
" X. @: f$ l7 [; p5 S+ T) x7 Y                       "number of cars by lowering the NUMBER slider.\n"
% _! U1 w9 O- ]/ h& m4 R& O                       "The setup has stopped."). k9 D/ v* j7 Q) |
    stop' Q# Q+ J  W0 |0 ~& j
  ]. x' J4 f# J/ c  b2 j! P  g

* m4 D' E& S9 o2 V. ]; [3 k* D- a3 ]  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 t2 J2 J$ H" ?  q1 N5 I5 D
  crt num-cars; K3 r6 [6 o! i. j6 Y) A9 \
  [5 O& f* K/ m' C3 E
    setup-cars2 e9 a' I# f) V. Z" V* c# B# s% s
    set-car-color
8 B: c7 w: B( X* z$ K    record-data( B$ z6 K2 u- q" i" z5 s  A( `
  ]
2 p* R, {8 S4 k; @0 u5 S4 j6 w. \9 v) G; ^
  ;; give the turtles an initial speed( ~- I  T; z0 I" g# j  q; b9 {
  ask turtles [ set-car-speed ]$ D' c9 Z/ }& `( N8 z

' Q# c# L( _7 Q  reset-ticks
" p3 }6 Q5 _+ j! Z5 Fend9 b+ w" C+ x3 L* R7 A. Y  s3 }: B* V

  _1 c8 ?. T7 ?3 n: l;; Initialize the global variables to appropriate values) e  x% g' A, J+ q' A
to setup-globals( e; r7 t# R( k) P: D
  set current-light nobody ;; just for now, since there are no lights yet- B$ M9 d( C* [  e8 k: s; M
  set phase 0; M2 c3 K0 n; o6 F7 P  d
  set num-cars-stopped 0+ R- x/ j. g, k6 a- c% _* U$ v- r2 r
  set grid-x-inc world-width / grid-size-x
( x0 G7 b3 l# m5 f( W0 B" Y  set grid-y-inc world-height / grid-size-y- p8 M8 W  U# Y' H

6 Q  Q- m8 d1 x4 u9 k& x- Q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! b; B, w( R4 ~! P, D3 W: G% J  set acceleration 0.099+ N4 Q# K. D0 E3 e- f. p. s7 |
end
( z/ v0 l9 i0 L! ]8 P& A1 [* o7 i  K# ~, O# a7 F' |; i( b
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 |; l+ i& r2 N0 \6 \0 l4 ?* q
;; and initialize the traffic lights to one setting
. u2 L' G7 W& u/ u% {- e; R* qto setup-patches
# O1 W: Y* G2 i" H  ;; initialize the patch-owned variables and color the patches to a base-color
( h9 P: M5 M9 N! |, A  ask patches. |6 B0 P3 V4 R0 W7 P0 v
  [
& z" @7 ~5 `! M1 z9 M: ~" T% Q; G; H    set intersection? false
5 f' c7 R4 ]5 H) O7 n% r) g    set auto? false- u9 \+ _+ F4 J9 ~
    set green-light-up? true" {/ o9 x2 m3 Z  L
    set my-row -1# O7 {/ @6 |  {" a  [
    set my-column -1/ y; u- l7 c" z0 F* \5 O# }+ B: A
    set my-phase -1; x+ m; D: V/ [4 o
    set pcolor brown + 33 E; P8 A+ g" C9 d
  ]
5 f* x+ D4 l- {2 }% {$ y* @0 g) l1 B1 A  T; L) k, O
  ;; initialize the global variables that hold patch agentsets: g% s. G* {$ n0 v, u% Z9 N3 o2 s
  set roads patches with4 r8 q6 U; x* O; O1 F: a" }% F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" L6 V( C) M7 V3 V! |1 K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" f6 N9 E: A1 ~: r7 V  set intersections roads with8 q! C9 j, j5 g( F! I/ r) ?! m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. I1 R( S9 F- \- p$ F
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: j2 z5 p: y! z/ [0 W, L5 J/ ~# c4 s

% V0 b2 {0 t- O8 n  ask roads [ set pcolor white ]
+ `% c8 ^0 k+ o# m; a    setup-intersections# i* N; Z8 S' o: Q& k! p5 U
end' K8 L, J0 X* ?7 ~- ^! J/ k
其中定义道路的句子,如下所示,是什么意思啊?6 f) ~4 N8 n( N0 `3 b3 c
set roads patches with+ k$ S/ W7 {7 \+ E0 c. e. A, i8 f* Y. G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) w! a8 W/ F& J) J# y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 X6 l4 K1 ?) K7 ~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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