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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。
' P% y/ S! k9 s5 M5 Xnetlogo自带的social science--traffic grid这一例子当中,: @/ \# L/ T. `6 u
globals4 G1 T6 W! K& z; `; |' z
[
, }. q( g2 \" p' a6 q( j  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 J( x' H- O- z( Z% w  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& b) S7 L' K. y. q* t. U7 M: {  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
' _! ?- m* E* [* z. d                           ;; it is to accelerate or decelerate
: q0 S: T' }- b/ v* }7 i  phase                    ;; keeps track of the phase
( U. Q9 N1 ^# l/ c- A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" D1 Q2 M8 |. d/ Y9 i5 g, H) x4 L  current-light            ;; the currently selected light
" _: @$ K+ L4 G" E
4 g4 v+ u; A0 U. a$ t2 _  ;; patch agentsets% D5 M( }1 ?6 p5 V% f
  intersections ;; agentset containing the patches that are intersections
" K% v+ ^% m: U  roads         ;; agentset containing the patches that are roads8 ]! E5 j5 D, p" _/ {: r; v
]5 ]6 j! W! r/ P

- Y% v5 v. z2 T: m8 s  K! Sturtles-own9 r" C: P+ L( T  j
[& v. l( e( J! `4 k; ]* N9 H$ z1 N  e
  speed     ;; the speed of the turtle3 w' s- _) B' l1 J
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
$ r& f6 A: N' I$ h7 g: [  wait-time ;; the amount of time since the last time a turtle has moved9 X- e! g6 K1 a7 H* H3 G6 g  n9 {
]7 D; [2 ^+ \6 ~/ y. ]1 h4 h

9 H& E  ]2 V5 Y; H% Tpatches-own
5 J# C" b# g* f# a& C' d[
! d" S' f# ?! [+ v  intersection?   ;; true if the patch is at the intersection of two roads" p( n& I* k8 {  @# v
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- @# l' C. ^( d) i) x4 B: N; O
                  ;; false for a non-intersection patches.
4 ?7 w9 P5 q9 h  my-row          ;; the row of the intersection counting from the upper left corner of the
; S2 b+ n3 X) a% W3 K                  ;; world.  -1 for non-intersection patches.. ?2 N$ N  h' W
  my-column       ;; the column of the intersection counting from the upper left corner of the
$ V% V; ?/ l/ Y                  ;; world.  -1 for non-intersection patches.. M8 [% J- O* s0 U0 V) v6 U5 ?
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ @0 V1 u. c+ r" h7 A* _  auto?           ;; whether or not this intersection will switch automatically.
$ g" B' q% x! r7 ~                  ;; false for non-intersection patches.* W1 G, a& |( d) Z
]. t. D, N2 u. F5 ~' ^) [6 U0 V1 ]

6 j: L3 Y" D# A; D3 e$ X$ E( K. n6 B; ~* g. q2 a6 x3 [) P  i
;;;;;;;;;;;;;;;;;;;;;;2 y" ?8 T# Y9 g& L
;; Setup Procedures ;;
1 q1 j: ?; e+ n8 n( w) f3 ], x;;;;;;;;;;;;;;;;;;;;;;
" ^8 @* ]3 z7 H4 \9 p5 i( J" z
6 Y! u0 |, V# u* L& y; P;; Initialize the display by giving the global and patch variables initial values.% y9 m$ c! X# T- ?( y/ B2 g
;; Create num-cars of turtles if there are enough road patches for one turtle to
& P7 h; W3 Q( U! i; e0 |7 A;; be created per road patch. Set up the plots.
+ C- F  b& E- j5 dto setup
/ T" H7 Q* e: X1 P; j  ca
% V# A" M1 ?( ]6 \4 \3 ~  setup-globals
: p+ \8 G  j0 K3 _9 q( b; h5 Y$ b! X! w0 N! j) U/ J8 _
  ;; First we ask the patches to draw themselves and set up a few variables
5 C( Y% I+ E  X# O% e: a8 {  setup-patches
( V0 B; E3 @& t  make-current one-of intersections8 x0 y/ S* x: @+ [
  label-current
4 T6 l7 W+ I' b( \& ~1 g  _9 b& X8 |  S3 W! I. w) P
  set-default-shape turtles "car") A. i* Z$ [7 v, y
/ Z9 e0 g2 M/ W4 C( W& ?  d" R+ [
  if (num-cars > count roads)
( U  Q/ t2 ]- ~, w9 Y$ j  [! \( c& q) s1 {' _% v5 t- ^
    user-message (word "There are too many cars for the amount of "* o4 k& q% \% r: M5 A% }3 Q
                       "road.  Either increase the amount of roads "
4 G" V" a5 V9 i6 `6 u  V, G                       "by increasing the GRID-SIZE-X or "9 Y8 n1 ?4 c" Q, I3 i9 q
                       "GRID-SIZE-Y sliders, or decrease the "
7 |. _( O; c: n  V                       "number of cars by lowering the NUMBER slider.\n"9 t! B/ {$ ^# G8 C- ^1 O( M
                       "The setup has stopped.")0 X2 ^& h4 y& Y/ k8 ]( U
    stop
& R5 j+ M3 h! `  x. {$ G  ]
# t% p: [1 e" v9 D7 Z
+ L9 _+ t8 M4 t  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 F2 s9 A: K) w3 \% u
  crt num-cars; @; ^9 Y2 w& g4 C; r
  [+ O% R% R- ?! T/ [' E, }' a
    setup-cars
# v6 C- J& L# G1 L% f8 M5 w    set-car-color. }; v. x  W1 t# i
    record-data0 z( c4 h1 Z# @6 W. U5 f
  ]
* ~4 a3 R+ Z, d) P% h) B- V
0 H$ @3 S9 y, W' m/ V& i  ;; give the turtles an initial speed1 j: }( I2 m3 w  B$ h8 q
  ask turtles [ set-car-speed ]
7 y; M) j- n- L& `/ ]
) h8 F+ x* d% a  reset-ticks. c" J5 o0 f! L1 S* V1 V
end/ T4 R0 z' h( l; _# M1 F

& ]3 D% q3 R* |' h0 z4 D# E: @;; Initialize the global variables to appropriate values& W) T. o5 K& G( Q; O, o2 q; B5 j
to setup-globals
! q% v  k6 |& Y7 ]  set current-light nobody ;; just for now, since there are no lights yet5 E, w2 d: x% ]0 j1 a( [5 n+ o! I% p
  set phase 0
! D) F. L2 J) S3 G* `" L1 X; J6 o  set num-cars-stopped 0
/ z6 Z) u# K9 m$ ~  set grid-x-inc world-width / grid-size-x
7 A# D2 s& F: K* m3 x6 O, \  set grid-y-inc world-height / grid-size-y
1 ]1 c; V+ ~7 p1 i4 ]- Q! o3 E: g% f# ?7 a! c0 b! W6 v
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ `. u! d# f0 ~8 [; x7 b- ?" z  set acceleration 0.099
7 M" r* z) y; z7 R! y5 nend
  l; v! C- \6 C+ G4 l
8 }$ u0 y; y1 L( Q  `, m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* z- c$ z- u+ a5 H" z3 k
;; and initialize the traffic lights to one setting
3 A2 Q4 D. V3 n4 dto setup-patches( \& v9 K% f  i$ ~! N* X
  ;; initialize the patch-owned variables and color the patches to a base-color
  J' f" G4 b8 t) _: r! i7 J  ask patches
" {7 P% L6 H& X+ w! j' p, }  [( p! A, g+ D0 _' M& h9 P9 d
    set intersection? false' p# C' X( l+ U
    set auto? false1 q' O: b( }- U* N5 Q2 w% k
    set green-light-up? true
3 m! b& T* R* H, H* V7 I4 L8 z: W    set my-row -1
+ a0 j, c* c% o: c% @2 ]+ m1 [    set my-column -1
( ^7 [: D( Z  ]- c    set my-phase -16 \! T1 h# ~8 F8 X/ r2 b
    set pcolor brown + 3
# k" p1 @$ J& Z: Z0 Q: \  ]
) o9 ~6 |$ @. c# R
0 q$ g( n9 x* b* \6 ?. T- T( S" L  ;; initialize the global variables that hold patch agentsets
" h1 S2 L) @# N  set roads patches with6 D  ]) z8 O5 v8 D7 N. B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; F: p1 w" p+ Y8 s  N  b: _
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& B' ?& P3 F+ \  set intersections roads with
; I. S7 r- o; ]5 f, |$ k    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' s- }3 q, L6 g5 W    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) j  o' P( h, q0 |$ P" o; V% F' }  A+ o9 D, M
  ask roads [ set pcolor white ]
# B' h$ a- T  b    setup-intersections
% c5 X9 E. O5 J8 t3 X  d4 lend
1 ^2 V. |! C6 d6 \4 U8 V其中定义道路的句子,如下所示,是什么意思啊?) M; `; ^% O; h- _
set roads patches with9 I2 R0 P* i, b3 J3 \6 _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" z4 t! `$ B' @3 z) J$ d8 X' e; Y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) _5 |8 m- C- l4 m% N$ O& V& r
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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