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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。
9 o* }; y5 ~* m; n$ V5 c& Gnetlogo自带的social science--traffic grid这一例子当中,' h3 E, }7 _4 S' O# R
globals0 g8 d& [* \( X9 ]
[% c- X: \3 S  q9 q9 c9 r# ]
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
  k8 |3 g  [9 K7 V: D2 n( g( ?  grid-y-inc               ;; the amount of patches in between two roads in the y direction* G# s2 }% b4 A
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if/ W# b9 U* h: j+ O5 T6 M& t# c6 q
                           ;; it is to accelerate or decelerate% J: J# a9 A! B; G* @
  phase                    ;; keeps track of the phase. X$ E- \3 L7 W
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
3 Y$ e+ T6 a: w- Z( ?) g  current-light            ;; the currently selected light& `# m! F8 v- |) ?5 X  m0 D
% g  s8 [# X: Y  T' s
  ;; patch agentsets6 a# K! z$ |* |+ ?3 v( n2 `
  intersections ;; agentset containing the patches that are intersections  I1 j: E8 O- R  N4 B7 O: o. y
  roads         ;; agentset containing the patches that are roads6 ~" N" A; J* q
]
  D& A; e( _7 v3 ^" d+ d/ i" T) X+ d8 W% O- v
turtles-own
0 k5 T  A2 g( j6 s) s# _[* H0 a  _: t0 x3 i! L
  speed     ;; the speed of the turtle
8 ?  D4 g5 |2 t: t( G  up-car?   ;; true if the turtle moves downwards and false if it moves to the right" }, J$ m0 v: X9 w
  wait-time ;; the amount of time since the last time a turtle has moved& p% L( X( Y) u3 O
]
" z9 ~' r- p! a, @! Z7 n& G4 c. {
patches-own
: Q: \) I5 c) T8 s  q, V[( o7 k' s0 k; F' g& ^' W
  intersection?   ;; true if the patch is at the intersection of two roads
3 @* b6 z  D1 B: c5 S" ?  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.8 O2 X1 q% [% g$ w- z
                  ;; false for a non-intersection patches.* ]2 E8 y  b( ]
  my-row          ;; the row of the intersection counting from the upper left corner of the
( \2 T* c) ]+ T" Y  l                  ;; world.  -1 for non-intersection patches.7 \/ Q" S- X: [& W9 J, c
  my-column       ;; the column of the intersection counting from the upper left corner of the
, T2 f+ |9 z) g  m2 m1 w1 k( H                  ;; world.  -1 for non-intersection patches.
' X) M- F; b. R. `  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.9 N% x, L# @& T# V) K
  auto?           ;; whether or not this intersection will switch automatically.
% J8 q- O( e8 M5 F+ X                  ;; false for non-intersection patches.. v4 ]/ v; \" o% f+ T4 \
]: C% v" m5 g5 L. Z$ ~6 M
- B! b! n9 E6 x

1 \$ v& g4 x+ [" [6 L;;;;;;;;;;;;;;;;;;;;;;
* f) U5 q0 ~6 H/ c; x8 };; Setup Procedures ;;$ C9 J- _5 |& i4 d* T% h, w# x
;;;;;;;;;;;;;;;;;;;;;;/ [' Y) ^: {, x) [

8 ^2 B# u8 P3 H% ];; Initialize the display by giving the global and patch variables initial values.
; w  {$ K5 u/ o$ U6 J;; Create num-cars of turtles if there are enough road patches for one turtle to" u5 X8 X8 P. J; P; Q
;; be created per road patch. Set up the plots.
! s/ h. N* Z' a1 @0 J" dto setup* n1 I- H7 }: R& s4 l
  ca6 V7 \' t! V) O2 L3 m7 W' {
  setup-globals
) i6 w1 e# e4 {6 s4 ?! z0 j
( Q. b" s( C  {1 j1 O& o9 C  ;; First we ask the patches to draw themselves and set up a few variables' f3 {; ]% f$ U& B9 I$ O
  setup-patches3 L  U" Q' F9 L
  make-current one-of intersections
$ c( b; j2 I5 ^/ \2 f  z  label-current
8 Q4 D+ v2 M5 K- K
- g! ?/ t; l$ U# v9 w" z( u/ S  set-default-shape turtles "car"+ D: k2 L& a; R$ Q( S3 Z" k

, f; s  `% y7 t. M9 K' Z  if (num-cars > count roads)
/ i5 Y; k! ]2 ?1 w3 h4 F  v  [0 `$ }0 W' B3 G1 ]$ f
    user-message (word "There are too many cars for the amount of "  y; ]& ?' w8 p. A8 |
                       "road.  Either increase the amount of roads "
: b: _, w  o6 k. W7 _                       "by increasing the GRID-SIZE-X or "
2 t. A' d- t7 s& F' N                       "GRID-SIZE-Y sliders, or decrease the "* T, F$ w/ w4 S% N# ~4 q
                       "number of cars by lowering the NUMBER slider.\n", \, M$ q9 g5 y, J8 O
                       "The setup has stopped.")
7 W, {# `, H$ S0 S; l    stop
, S4 \; d- N) J% N/ S/ I1 ?& _  ]: c" E, n1 O6 P) N% r6 U

6 w  q) P( ?9 A# N9 ?  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 @$ E6 B/ e* B" ]; W
  crt num-cars' P; u6 T- X" ?9 f0 q  i
  [& P3 Y6 |0 c* n
    setup-cars0 q& u! J; Q. o: }% L  g
    set-car-color5 {) E- b  e. q! _" e
    record-data
) ?9 f4 t$ j+ q  L+ o1 c! K  ]
/ e# ^5 W3 D, V# r) [1 K5 S/ B% p  a; H8 ~
  ;; give the turtles an initial speed8 L& B+ x- q6 V1 M: F( ~  y7 |
  ask turtles [ set-car-speed ]
6 ]8 X5 Q" b6 ~6 m$ T3 w' L% ^3 D6 j* S) `  @1 H! I
  reset-ticks
" v$ a/ V% X0 @end
7 d) \% e' \& ~- e" C" A" i
* R+ \) m( e* v0 U4 d6 X;; Initialize the global variables to appropriate values
4 B/ \3 j% `" Pto setup-globals
; w, `; c$ m& c8 U- l: A  set current-light nobody ;; just for now, since there are no lights yet
( l7 p6 n- ~; T, c( s  c  set phase 0
- z/ i  c1 }. S/ F  set num-cars-stopped 03 x. y% B: R  j4 w2 Z
  set grid-x-inc world-width / grid-size-x* Z6 r/ y& B4 R: Y3 T
  set grid-y-inc world-height / grid-size-y
7 u3 b6 x% \3 Z& W( }' W
% q/ e1 ^- S; T$ c& w1 A: g  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 x+ }8 o  ~* d" ~& y; F% w' h  set acceleration 0.0990 T8 R) @, N* o
end
+ S- k" H+ f8 I# G8 V) I8 P, H  d# Y5 p, C3 \# n
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 V1 k% E, I0 a8 z;; and initialize the traffic lights to one setting
9 c* x% I8 t4 D; \to setup-patches# l" x6 R- }3 ?
  ;; initialize the patch-owned variables and color the patches to a base-color
5 V7 l) P5 @9 U6 u  ask patches1 Y" @) x5 j, e
  [& S9 Y7 v2 g9 e
    set intersection? false
2 h) [8 k4 B' T& h    set auto? false
  `9 \' k# q' S; {    set green-light-up? true
% v# V. [0 S9 v    set my-row -1
& N; h4 p- k: x2 R8 D" G    set my-column -1
+ M' {2 o  x+ b: I6 M    set my-phase -1% E$ G& C) S: R
    set pcolor brown + 3
: V& n. T5 a$ h, F  ]
9 Q; }( A& ?3 [5 {3 ?. |
$ @; u: X, w" z" B+ g  ;; initialize the global variables that hold patch agentsets  V  [& Q) H2 v3 x1 w) d
  set roads patches with" Z) r5 X( ?4 F/ j& |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ c2 H# e1 C$ r. S% U
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- Z; Q: w* K9 q7 H( e+ ]
  set intersections roads with+ x4 y% @: Z! P$ Z+ C5 T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- d1 C& H' ]0 ~+ f% w$ d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. t6 E+ b) y* |/ |5 \" a+ e/ {( X; H# Y; ?6 _
  ask roads [ set pcolor white ]( t& `  h' F4 W, g) f4 |6 W
    setup-intersections
3 `: e" @: N; N+ L% Gend
' Y6 v' j5 z' k* H; n其中定义道路的句子,如下所示,是什么意思啊?3 t* X) x; e* ]% n+ J' D
set roads patches with
0 b  `, T9 b- K; B( D+ I4 O! f$ {! W    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- j! G5 O/ q: R3 ]" |0 q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" ~; K8 F; [; k* D( \
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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