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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 i. {$ n% R1 U( o# Anetlogo自带的social science--traffic grid这一例子当中," V- D6 ~. P/ u0 K1 a6 i# R7 R
globals
! u' Q; p  e: n- b8 O" e) O4 w[
- i& ~6 `) _( }  O  grid-x-inc               ;; the amount of patches in between two roads in the x direction
2 H9 R' c! B8 @1 @; W$ O& H+ q+ s  grid-y-inc               ;; the amount of patches in between two roads in the y direction
% K, g1 W6 A, c  k  acceleration             ;; the constant that controls how much a car speeds up or slows down by if5 w  t0 Y! H# i; l3 E
                           ;; it is to accelerate or decelerate$ k3 w9 s( h" d- F& @4 V) r
  phase                    ;; keeps track of the phase3 R! y& G& [( a' J) w
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 _; A) [+ h8 ~- G, P9 H  current-light            ;; the currently selected light
8 K9 J0 I3 J# A0 R; b: {
  L& z6 i0 ^3 c1 a& j: p: f9 L  ;; patch agentsets2 ~, R7 C0 U0 O. g6 n' ]3 i
  intersections ;; agentset containing the patches that are intersections
, N9 G5 b# A: ?# c  roads         ;; agentset containing the patches that are roads; s' T: `3 `5 d+ G5 A% F
]9 ?5 Z1 {. B* {" ~

+ g' F+ ~1 e; ]turtles-own$ T, ]; S: n# q+ b
[' }3 j$ D# C: l! j( d  B+ M, X
  speed     ;; the speed of the turtle3 F& \7 ^4 ?% i* D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right2 j* q* A# m, S3 {3 U5 I- S
  wait-time ;; the amount of time since the last time a turtle has moved
2 A% p& a1 F. k. m6 z0 Q5 h2 Y7 []
7 N7 A3 z4 G& M; {" a/ M
/ A: E- y$ a0 X7 o, |patches-own( C4 E+ V, g( W: u( k8 e# T& P
[
5 v+ S+ e1 y* ~6 @8 n  U  intersection?   ;; true if the patch is at the intersection of two roads
! s# t. ?% U' Y  A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.2 z: v) C0 F- }* Y* S
                  ;; false for a non-intersection patches.6 r7 |; F1 }& F: w+ h  v
  my-row          ;; the row of the intersection counting from the upper left corner of the
& l3 ^  }$ d8 S7 B  n( d+ L5 x* c                  ;; world.  -1 for non-intersection patches.
% T4 w" j6 Y$ j  my-column       ;; the column of the intersection counting from the upper left corner of the; ]0 P/ J( |. E$ V
                  ;; world.  -1 for non-intersection patches.
, t1 t, ?/ U; \" h8 t8 N( E  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.4 z2 b8 C/ o6 f$ U
  auto?           ;; whether or not this intersection will switch automatically.2 B  ]% M# d; m! {
                  ;; false for non-intersection patches.
! H# X! T7 M  z9 A) F, A]
7 c& I" L3 q, r! A; Z  R
! Q/ f5 K  y9 e2 K' W3 G8 I5 _( r  k# P6 @' u$ ^% O) W
;;;;;;;;;;;;;;;;;;;;;;; e0 E& d) Y* i- h
;; Setup Procedures ;;( p$ _# o5 x# a$ T9 w+ E0 s8 n5 {0 N
;;;;;;;;;;;;;;;;;;;;;;- a4 n, G5 d/ E: T! p( e6 ]
+ m0 Y3 n9 e- h! d1 u3 T) m7 {1 Z
;; Initialize the display by giving the global and patch variables initial values.% |% q4 d1 O$ _1 U" J8 j9 h
;; Create num-cars of turtles if there are enough road patches for one turtle to6 p. A% b  _' v" K! Z5 G
;; be created per road patch. Set up the plots.# N5 ~! w% n8 Y2 Y
to setup$ J, S; x6 R2 X/ U: e9 r
  ca
- m: e* B  t. Q( w7 e8 m) k  setup-globals
: n& h5 Z9 {) v- }8 |, L$ U+ y& _8 O0 b0 t) R/ b
  ;; First we ask the patches to draw themselves and set up a few variables5 O! ~5 @# V1 z' \  M
  setup-patches
3 T# J+ b1 q* A- t$ j9 T/ ^  make-current one-of intersections8 l: x$ c5 K- c9 X7 K
  label-current$ _7 V- |) H* y5 Q) r& f

/ v  ]1 y! L0 O" l0 Z* n) H: E  set-default-shape turtles "car"
9 h) V8 ~& z+ M$ T- _" G. z) r# |6 T; i) ~) l: z
  if (num-cars > count roads)! E* S" l0 C% o/ d3 c+ b& x; c
  [9 }$ C/ h: z5 E
    user-message (word "There are too many cars for the amount of "' s- @5 z: k6 i, ^1 W9 m0 T! W
                       "road.  Either increase the amount of roads "
  _1 k! y4 H* |/ r$ t# m' }                       "by increasing the GRID-SIZE-X or "
0 h6 g- O/ r, f                       "GRID-SIZE-Y sliders, or decrease the ": ]% z( C" Q$ d, b4 Q8 r
                       "number of cars by lowering the NUMBER slider.\n"
0 ]' e3 D: e6 \$ O6 L                       "The setup has stopped.")
, W" {  s# L$ u( }( k1 y& b    stop3 a' [. z5 e+ K9 {4 ^
  ]
& n, E% I7 d: h3 O+ ~  ^( M' f2 H3 [( T  e) g1 u. a
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 {8 M4 _2 I; m# Q) b2 h  crt num-cars
& O: b0 Q) W2 Y  [
/ u4 q' ~7 C) Z# B( B    setup-cars6 k0 p+ t1 j1 S/ g  X4 I
    set-car-color
6 c& w$ K7 X! r) R6 g/ I    record-data) x0 o% B8 \! y' O6 a7 J7 s( I) g6 e
  ]
! i4 S3 }) U& @. D8 B
& D2 b. \4 w) T  A  y  ;; give the turtles an initial speed7 u. [# I. y' b
  ask turtles [ set-car-speed ]
2 u+ j/ E! V) {& A+ V3 y% V# |2 B( p1 p
  reset-ticks1 o8 z# O0 X4 r! T7 P. _
end) P+ a  o& S- t" V% ?, w" d4 C
3 H# P1 j% g7 _) E
;; Initialize the global variables to appropriate values
1 z7 {& ~5 S: qto setup-globals; [9 c- s5 P" V
  set current-light nobody ;; just for now, since there are no lights yet
1 B* \5 z8 ]' s2 v- \7 L2 y  set phase 0
4 V( q5 Z! o( _* h) c/ f  set num-cars-stopped 00 U" U8 O$ a* x8 |+ @
  set grid-x-inc world-width / grid-size-x$ S) F  i* X1 `; G8 L
  set grid-y-inc world-height / grid-size-y
: l8 B: A" y" J; p' Z. B1 t1 J  E6 L
4 S; W/ f' {! z# z7 g- w* B  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! n! c9 [2 y" v9 ~, Y  set acceleration 0.099$ K/ [' s  L4 G: G8 y
end
/ p/ ~" J4 z2 Z, p" U$ U
- Y' ^. ?1 ^# R6 s- i% I8 z- g9 y. n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 q6 r+ e- l6 t% @& `4 @+ C  k;; and initialize the traffic lights to one setting' b& T. |* l! C. _! s6 q7 W
to setup-patches
; J$ }% q0 Y. P' D* \  ;; initialize the patch-owned variables and color the patches to a base-color' {: r4 r! [) [' D) |" v; p
  ask patches
& w) V: c  d( |7 I. [# D: C7 T# k  [
+ X" K2 Z+ o8 Z$ l1 ^    set intersection? false; `. b- _! _  }1 M/ Z; [9 P
    set auto? false
: H$ W, y) O5 J: P4 u% w$ d    set green-light-up? true
; A6 W  W) W5 D1 }6 A# q3 P4 H    set my-row -1# _, P+ n+ _# X7 \/ r9 X% s/ h- ^
    set my-column -1
! ~3 P' [0 K7 g+ ~9 p6 W' Z    set my-phase -13 z9 i% f1 h1 p# A
    set pcolor brown + 3
& V4 q0 }6 ]' G8 [  ]
/ Y. ~" D, f  Q2 t( u- x7 c+ F. b7 f# W- q8 X
  ;; initialize the global variables that hold patch agentsets
# l2 i9 x: M& Q# o  set roads patches with  z4 F! p7 n3 i7 d7 s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 d& D6 z/ t4 A6 l$ ^* u3 a. O% [) w& o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* l0 Q6 a0 E5 q2 b) O  set intersections roads with2 Z( s8 f) a' {1 m: R. _+ o  d& F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* \2 E' E1 j& V; X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 D- L3 V5 R3 R& M9 D
0 v* l8 n1 f( v1 u6 I
  ask roads [ set pcolor white ]
+ n! R# r+ W) ^2 V( E+ Q4 q    setup-intersections7 R3 Z& d$ W: `2 K/ ~# X
end
2 r* x; W/ k3 X1 X其中定义道路的句子,如下所示,是什么意思啊?. _! O, d2 `' B& f
set roads patches with- M& {- u5 f! M/ ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* p/ G% W  r! N6 {. a6 R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ Q- C# z4 m4 E9 S1 Y5 k0 O, x
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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