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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。
4 u; O7 {3 ^* U7 |: T" O9 w9 gnetlogo自带的social science--traffic grid这一例子当中,
! N# m$ a% i6 K& b8 l, ~9 Nglobals) T, `. ~0 R& y5 s( m) G
[
) I$ t# ?3 U* K. P6 r  grid-x-inc               ;; the amount of patches in between two roads in the x direction' u& O* C$ {; K- ]/ P% |
  grid-y-inc               ;; the amount of patches in between two roads in the y direction5 `2 L$ q3 k2 O& u" c
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, P5 s; y; `% m
                           ;; it is to accelerate or decelerate
' k& b$ m" K/ q' x# H- o3 k" q  phase                    ;; keeps track of the phase% h* T6 f; v- l4 b/ U# Y' @8 V9 a
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
( n3 u/ J, F6 H! U: q/ {( P7 X  current-light            ;; the currently selected light
6 _* x& w# Z0 x& F% K) }; J3 q2 v. J
  ;; patch agentsets
6 A7 y, o+ P3 S% @1 O" f5 H; R  intersections ;; agentset containing the patches that are intersections9 G" f! O/ Q& M2 f
  roads         ;; agentset containing the patches that are roads* u% [1 r8 R8 D1 C
]  }% a* O5 c4 v. V
2 w! k, C1 J6 F, \; O# `
turtles-own
1 z: w0 I& \+ l/ S[3 x' c7 |+ R5 O  f( C
  speed     ;; the speed of the turtle
, y) @  ^+ u* v. I  up-car?   ;; true if the turtle moves downwards and false if it moves to the right) a9 n- h9 p% U) t8 j2 o6 g. `
  wait-time ;; the amount of time since the last time a turtle has moved& N# r0 n& R# x6 J7 o
]% h- R# C% u; d( e( N9 H
8 Q' C6 H1 j5 |' ]
patches-own0 u3 u" z$ y7 {( k
[
/ v: F. a9 K- V; D  intersection?   ;; true if the patch is at the intersection of two roads
1 A2 ^! J5 D7 d+ O7 {9 k  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# a; A0 J+ f  a) k- \4 W
                  ;; false for a non-intersection patches.) o+ z2 h# R+ w+ ?0 K
  my-row          ;; the row of the intersection counting from the upper left corner of the# W& X6 P; N9 y
                  ;; world.  -1 for non-intersection patches.
5 y9 M; [% T+ k3 h, e+ b  my-column       ;; the column of the intersection counting from the upper left corner of the4 D: U# z2 P+ w- Z3 e
                  ;; world.  -1 for non-intersection patches.
) |% ^% o# r: p5 r! E  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' p: h! k+ O; {# B0 @! X
  auto?           ;; whether or not this intersection will switch automatically.
' [& N5 ~% y$ l- V                  ;; false for non-intersection patches.9 {) T$ G. j2 l4 G& T! h
]
7 y, F# j' }% a! N6 d8 T$ H; r! W: R) d

/ l1 e3 Y) g2 B  M4 r: D: C;;;;;;;;;;;;;;;;;;;;;;4 Z7 R5 D: v+ A3 \
;; Setup Procedures ;;  \& W4 n  K# `3 M
;;;;;;;;;;;;;;;;;;;;;;
  T# f) d# U3 p9 o, b
6 q' k5 P! E; o4 G7 Q;; Initialize the display by giving the global and patch variables initial values." v5 J4 j/ w: a# b2 e9 }3 V
;; Create num-cars of turtles if there are enough road patches for one turtle to7 T/ \; ^" t, a8 w* y0 t
;; be created per road patch. Set up the plots.
! B  D1 L6 U8 X6 B& nto setup# d4 [* t% [5 ]5 z: }9 I
  ca
) b. B! @6 I+ [& P; h  setup-globals
+ |1 X( X/ p: D8 \& y! x$ ~$ |/ y( Y9 x7 j  P/ {
  ;; First we ask the patches to draw themselves and set up a few variables
* Q& I" X4 q- i# Q) f& @; v/ {) k  setup-patches
# M: [* F- V9 L* B7 P  make-current one-of intersections) t) c7 S1 ?! B* c
  label-current4 V5 w; M0 _. k. A( z
  g6 V' R, \1 [: \
  set-default-shape turtles "car"
7 ?, R8 ?  Z5 D( ^5 \6 x6 ^& ~$ b$ l1 `
  if (num-cars > count roads)3 T- N6 `4 v7 s4 A" F' i+ u
  [! C* \  e5 m4 k$ E
    user-message (word "There are too many cars for the amount of "
! s' _, k4 A6 F. E                       "road.  Either increase the amount of roads "
! g0 I5 p8 ^" q- W& ~: d8 P* ~                       "by increasing the GRID-SIZE-X or "/ k6 M+ Z$ ~9 c2 f0 e; k
                       "GRID-SIZE-Y sliders, or decrease the "; X- W2 ~% A" ?& q% V3 h
                       "number of cars by lowering the NUMBER slider.\n". K) \) I  y. l$ P* l
                       "The setup has stopped.")* t) u2 J  w: i& F+ C
    stop1 k: Z6 ?5 ^' O: `, q0 f1 N/ x% l
  ]
% e. j7 {( q' t7 `  e; y! V4 n# f# _9 k; _8 Q
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( o) ?. ?# A. M5 P, F: a  crt num-cars
- ?* D- ?$ n8 W. h% `, ]# `. U  [: M+ \* j- ]. D1 S
    setup-cars  s4 d1 P6 V( M# U
    set-car-color
6 B, d& m. b, Z' n    record-data0 |" a2 i9 [( o7 l# z
  ]
  t* |1 H0 D4 C8 t$ J) u" J1 J' [  N
  ;; give the turtles an initial speed
: e4 M! Z8 n8 t  ask turtles [ set-car-speed ]2 J& V* _. O; @' O
# A' S6 C" }# L$ T" j
  reset-ticks! {" L' w) e- O5 I9 I* T
end7 s- [# t9 c: I# n# ?. n# H9 J

  [/ f4 a$ U+ d, ^0 V& J1 Y1 x;; Initialize the global variables to appropriate values
7 k2 d. u3 \4 L2 tto setup-globals; H- c# `. N$ R% r+ N( W) r
  set current-light nobody ;; just for now, since there are no lights yet0 b; D, C, f7 w8 A7 E2 I& `
  set phase 0- \" {' ^9 u, b
  set num-cars-stopped 0
" z1 ^+ h  j/ I( D4 ^  set grid-x-inc world-width / grid-size-x
+ n# ~/ Z1 n8 g" Z: E7 w/ X# H' j  set grid-y-inc world-height / grid-size-y
. ~; i: k  E7 y$ p7 a) D$ v: \% D0 [4 G: i
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 {5 q6 x; d7 }  set acceleration 0.099
+ v5 I1 ~7 k) Z6 V% E' k' E' vend
( v) P; |# d: s6 }& P2 s7 q; @: Z7 u3 q2 @4 S$ _- g8 T
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 t2 L" Y: V. f: q8 }- R% m
;; and initialize the traffic lights to one setting
2 `7 j) G- h# B: K& {to setup-patches
4 m: O3 G( J' `: ^; d8 N0 `  ;; initialize the patch-owned variables and color the patches to a base-color' S) o. B# f: y3 A$ O" H
  ask patches& a* X: a' S$ q! k& c/ h, V$ C; `
  [' L- K  g1 }, r# R3 K
    set intersection? false+ X/ y1 P" j9 d5 m0 i: D9 I% B
    set auto? false
& w; Q. m; Z4 R" g8 l( ]. J+ y( F    set green-light-up? true
- H5 b; R2 y- V' U( c# U9 c    set my-row -1
- l& Y& Y- z. j2 a    set my-column -1" h9 M( |  \2 Y- ]* B* h
    set my-phase -1
  E0 o6 n! Q, r) a    set pcolor brown + 3" j# X9 o) \' W6 D1 x
  ]
# M5 r* y* g5 j9 W7 C
3 \. t& v: {0 l# O  ;; initialize the global variables that hold patch agentsets) ~8 O" B! d$ @2 ]: E
  set roads patches with) {6 |# d+ [( q( e& X4 T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! e8 b6 L) E) t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. O% q1 R4 x$ \  B( T$ S
  set intersections roads with' R$ {/ K  Y. m3 E) D( h4 ~0 w$ A* l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' A, q( y% U) [    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* E* K; d( `* t1 N
! f. g& F  e* h1 q: W  ask roads [ set pcolor white ]& W9 X. B: f. _2 S$ L; y
    setup-intersections4 B. y5 W2 P* }% q
end
, {6 r# m% k' U' A/ ~其中定义道路的句子,如下所示,是什么意思啊?
5 I* {# h$ h& b set roads patches with
1 \" {/ Y' l" r. t! a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ G9 C4 r9 A& {8 r$ b; ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ x4 k) j' f. v) A& L7 {. n8 h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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