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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。
) V) {- @$ k9 e6 A/ \netlogo自带的social science--traffic grid这一例子当中,) W! H% O% t: j, n) K( o3 P8 k
globals
9 g* J& \' N. V& v[
) z7 b: u. z$ R7 F  grid-x-inc               ;; the amount of patches in between two roads in the x direction
: b% o! `3 a0 c# o: k  grid-y-inc               ;; the amount of patches in between two roads in the y direction
, J& r0 C; b0 ]3 @+ w1 P  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" V: o2 V/ V1 S- f% M5 k* u  K, ~) O                           ;; it is to accelerate or decelerate# V$ O+ R/ d! n2 {
  phase                    ;; keeps track of the phase
0 i- v" j$ y0 l' @- j  Z, O  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure0 [& m' u6 ~0 _; G( N
  current-light            ;; the currently selected light8 w2 {3 j9 o$ l4 C& V3 P" r
. z# J+ I% y9 y$ |0 a
  ;; patch agentsets
0 o1 S$ |( C9 \. O3 t& [1 h  intersections ;; agentset containing the patches that are intersections0 @& F+ Z1 q% T. t& M& D) k
  roads         ;; agentset containing the patches that are roads4 L5 b( ?0 N: R  H+ L7 N- }4 t% F
]( n- k+ O4 i* T& m; }

  p% t  r: p7 s( o2 V) _turtles-own8 r. S$ c5 F1 p% \
[; O" |9 i# B( i3 f7 s) o5 i
  speed     ;; the speed of the turtle/ Z/ Z2 i( Y7 `% x+ C9 k
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
+ Y" A# {6 I# x# b5 H  wait-time ;; the amount of time since the last time a turtle has moved0 A* s4 Y% @' ~
]
. Q3 l9 W% d; j  M; ^% l  [' T8 \) D1 y) a. }8 F/ M  N9 @
patches-own1 X- d- {+ p$ ~6 ?6 A5 Z  e
[6 V" R1 }% R) P# b
  intersection?   ;; true if the patch is at the intersection of two roads8 V- |& d" t; \; N8 s% [" X2 F
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
+ r$ Y. W% T# [/ y% o- I                  ;; false for a non-intersection patches.% C5 P. y/ Y' H, L3 Y0 x9 e
  my-row          ;; the row of the intersection counting from the upper left corner of the/ c% |. M/ X1 D7 s
                  ;; world.  -1 for non-intersection patches.
$ I0 y. z" z8 _. }  my-column       ;; the column of the intersection counting from the upper left corner of the3 u* L0 ?* r: j' u1 f$ d
                  ;; world.  -1 for non-intersection patches.
5 H) n/ ?# A" G1 c2 n  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# x/ I4 p7 P6 ~& k* H5 L  auto?           ;; whether or not this intersection will switch automatically.
" c2 Z& f% _* ]# t9 b- H" A& Q                  ;; false for non-intersection patches.
/ Y4 c) h2 a9 f1 s6 k]! w$ E# x' e- `6 E$ p* |$ K% R
& L/ Z' v5 z( p2 Y/ W2 o( N/ I

8 n  `/ ?: V+ ~1 l$ T, {;;;;;;;;;;;;;;;;;;;;;;
3 q5 i( n8 e" b, d  S' I( R9 ]. X7 k;; Setup Procedures ;;' X/ r( R! a. [) C3 {8 N; N/ e
;;;;;;;;;;;;;;;;;;;;;;
7 z* T' r% s( F% E1 j* ^" l8 _1 r; e* V- ?
;; Initialize the display by giving the global and patch variables initial values.
5 D; N$ U/ A% o. l9 M5 Z$ J/ w& U8 X4 k;; Create num-cars of turtles if there are enough road patches for one turtle to
) J3 V' v+ |8 x3 ~1 a;; be created per road patch. Set up the plots.& v- t" j( ?& e0 D) B  d9 f
to setup
. [5 d' D9 d1 s6 O% E  ca& T: J' H9 r$ _1 k8 ^& m3 N- W
  setup-globals
; p' \' m2 M  R4 s$ E$ R3 |0 W0 N
  ;; First we ask the patches to draw themselves and set up a few variables7 N7 }+ e# R  m7 H
  setup-patches3 S( g/ ]3 @6 y5 {+ X8 e
  make-current one-of intersections: {6 a7 n6 Z4 f% h) U6 }( A
  label-current
) L7 b% W1 V! H) x# x8 C: T
  p1 G2 P/ g4 i/ A6 {  set-default-shape turtles "car"
  q8 K  T8 [' X: g+ l7 `
" `/ ]  \: n2 @4 `' j  if (num-cars > count roads)
' d6 C3 N% `% F! I4 ~- p6 M4 p* d  [; e" d% w  w; f  x% E; x/ S+ D
    user-message (word "There are too many cars for the amount of "
  p. q- H. q! v2 w6 l2 d                       "road.  Either increase the amount of roads "
/ Z4 W- `* q) t4 b( T5 @0 r: i                       "by increasing the GRID-SIZE-X or "# U7 m8 o( d9 S
                       "GRID-SIZE-Y sliders, or decrease the "( p3 c* e) g8 b8 g1 g' y
                       "number of cars by lowering the NUMBER slider.\n"
  T; L- i* k8 m                       "The setup has stopped.")
% [+ m, L! K* _* r" U    stop. G9 z- u8 y) G. w; B
  ]! L9 T: i+ G: I# n1 |  {

/ g" A' E5 w" l  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( J( x; f3 O$ \- |! `" b. h- ]  crt num-cars
3 x+ H7 m0 f* |7 Z  [% l! h3 X, b" |
    setup-cars
- G" o$ M) a3 A# N6 O6 D  m    set-car-color( c: {. |, e" z
    record-data' d4 k1 w* u3 i: v$ f& I! a
  ]" t( s. r" X  W' I0 j, I: ~8 k
2 y7 w9 n  M' o! ~: Q
  ;; give the turtles an initial speed/ t7 H& @+ ]2 Z7 m. h4 U* J
  ask turtles [ set-car-speed ]
& e; x; E% s# z$ U4 ^9 _1 e- {5 j5 [
  reset-ticks( a, {. U7 L% P8 J7 l
end
$ `, C. D, v" o7 Z0 ^& t
5 v/ l' g0 W9 T" u1 s2 h/ }# _;; Initialize the global variables to appropriate values
. W+ h- R$ ~* L/ x! m2 nto setup-globals' x7 A8 ^% D* N1 ]
  set current-light nobody ;; just for now, since there are no lights yet
5 [$ _# R/ @7 x" G( A( R4 n  set phase 0
4 X# q% P; I$ C2 u* f  set num-cars-stopped 0
9 O: I0 U4 w; l  set grid-x-inc world-width / grid-size-x
" @$ B' B- R& G  u6 ~9 ]8 R  set grid-y-inc world-height / grid-size-y0 i* O$ U3 v# M) V: [
4 o/ l7 w' W# K
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( a- _2 e. w+ I/ K4 r  set acceleration 0.0999 y" H! @' |) Q# J# {$ Y8 \4 c
end
, ?1 Z2 |$ q: j" C; y: `
' r: S7 Y  {& R;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; B1 ?9 K: s6 n( O4 H;; and initialize the traffic lights to one setting
* j4 v2 a  X8 s' g; Nto setup-patches
/ b+ F$ _7 g9 ?" ~  ;; initialize the patch-owned variables and color the patches to a base-color
6 J- \! O6 }. q) J: M. o  ask patches; P2 H% o8 M2 N7 w
  [
* V+ ~- e3 I7 H. S6 R0 ?% X' |    set intersection? false3 m2 N% u7 f8 {4 }
    set auto? false
8 ?, E0 X% ~9 p, }/ q9 j. c    set green-light-up? true2 ~& u: C" [1 [. i2 x5 n0 `+ q2 A
    set my-row -1
/ L( V$ R) Z2 o; T! t    set my-column -1
1 Y5 h$ q3 V% P5 B. i* Q  [    set my-phase -1
3 z2 J& Z7 V; C4 }% R% }5 ~0 E    set pcolor brown + 3, B- S- t4 D, }
  ]/ O" A4 T$ H+ N1 [0 A3 L$ V0 s

8 F  F7 x$ q% D; h- }2 J3 Z  ;; initialize the global variables that hold patch agentsets
. u- X% M! E" ~- d3 o5 e4 Z  set roads patches with3 Q* F& i; s( H4 ?6 K/ G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 y3 Y! \' C, }) M7 B! y2 K5 w+ b6 f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 a! e9 a, p  t9 i% C" K  set intersections roads with! g" z1 \. d5 H) i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 r+ g$ ~9 e/ R( _0 E7 ]+ C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. N# g4 H9 f3 n3 \. ~" @
0 F9 v6 Z; |1 D
  ask roads [ set pcolor white ]
0 [. |. ]+ ~/ N4 H3 E    setup-intersections
. \5 j3 Z- M" ^3 hend
% R( \' W' \9 h" H2 z: s% [/ X其中定义道路的句子,如下所示,是什么意思啊?
4 s8 j. a3 z- ^" ]1 W; S9 d set roads patches with  _; N( d( _( n* j5 X: ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. {5 J' A3 q. b: ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& }6 {9 O& ~  \7 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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