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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。5 W- J+ Z. {& _" Z% J9 A, a$ @, E0 Z
netlogo自带的social science--traffic grid这一例子当中,& ?( ?! n# J" P
globals1 j. z# p* F/ V
[
7 E. C! d* q3 X% z' x6 S. H( z! y  grid-x-inc               ;; the amount of patches in between two roads in the x direction2 G9 p/ t0 P& Q; k: z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# f% X% ?, a6 y- z  acceleration             ;; the constant that controls how much a car speeds up or slows down by if& i+ b& i7 B5 {5 J+ F5 N* m& @
                           ;; it is to accelerate or decelerate
4 u0 i3 [  @# W1 s0 u: X  phase                    ;; keeps track of the phase
" Q" n9 I- j/ O& H+ n  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ g$ p) I( B. V: Y3 M
  current-light            ;; the currently selected light
$ T4 |) N/ ]: l2 d
7 E5 o; }& `, @  ;; patch agentsets
/ w4 r) p' [( `2 N5 f( o, J5 d  intersections ;; agentset containing the patches that are intersections
: S3 N% o' h' z. q% b; A) \  roads         ;; agentset containing the patches that are roads
; J& N. x: y% F8 S- Q+ B" i]
) k% n  G; E) i! t$ A1 {! a6 a" s3 C& n+ l! M4 j/ H
turtles-own  c9 B1 S3 x0 n# y: r
[. h( R% o$ l, i  f1 @
  speed     ;; the speed of the turtle
2 P% C# l. \# n: @9 n! D" N- i7 C  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
4 F- i1 g# g$ V" Q  wait-time ;; the amount of time since the last time a turtle has moved
. U7 Z  z  X3 q' @# T; z]
8 `0 L8 T7 C4 }* L5 {+ Y3 O1 d2 }# m# t
patches-own
; k0 f* p/ X7 z" j0 {[7 P( N% g2 O. z$ E3 m
  intersection?   ;; true if the patch is at the intersection of two roads
1 B+ [& h; e/ A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
8 v1 l' m9 V0 P                  ;; false for a non-intersection patches.1 R* G2 z1 T( w5 B
  my-row          ;; the row of the intersection counting from the upper left corner of the2 S& q. Y+ W. `. n7 f
                  ;; world.  -1 for non-intersection patches.
' E& \' e. l+ Z* X2 h, ?* g( H  my-column       ;; the column of the intersection counting from the upper left corner of the. j0 M2 r7 y* m0 f% w
                  ;; world.  -1 for non-intersection patches./ F+ m( T* n+ ~
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% M% ~5 z* K) h6 U% V6 B" B& n/ |  auto?           ;; whether or not this intersection will switch automatically.! d, j8 Z6 o2 O; Z( R
                  ;; false for non-intersection patches.
7 \! I) \( R8 g% `8 k1 {4 @]3 S$ R' }9 x: P9 E: m1 }7 x
# w. O% Q$ s4 q+ q% _. v- \  K

( M3 y+ C9 @4 y9 n! q; L( C;;;;;;;;;;;;;;;;;;;;;;
/ V* u5 ^/ _. U;; Setup Procedures ;;. i& g' ]- y. i8 z& W$ ?. k3 z
;;;;;;;;;;;;;;;;;;;;;;
& x! E- e8 H; E0 \
9 R' J2 u4 R/ s;; Initialize the display by giving the global and patch variables initial values.; N5 V8 }, Z, C' X* j) i! q
;; Create num-cars of turtles if there are enough road patches for one turtle to& G5 j& O2 }  D* ~* s% Y3 f" C
;; be created per road patch. Set up the plots.
2 Y+ F, q: u. }# l3 K$ H$ E2 [0 C: \to setup0 J2 C1 Q5 ^, D. M% n5 m- v" ^
  ca
: M, @$ Q; ?6 U- N  setup-globals# ]9 m- h" Q! V+ e: a) ]

! @2 i2 G: M0 D# A0 Q6 y$ F* P) Q) t  ;; First we ask the patches to draw themselves and set up a few variables
, ]; H- }% w  {, ^2 w  setup-patches$ E! Q: V) _- D- @$ G4 n# l( N
  make-current one-of intersections) }7 G: c5 v, O
  label-current: o& \+ C; w/ W) t& O1 e/ e, W- u

  P8 P/ ]2 h# ?$ r, c  set-default-shape turtles "car"
+ i$ b  [& a+ Z+ O) Z9 n% I
0 v% B% }7 V) w  if (num-cars > count roads)2 h! Z; \( I. b4 K) R
  [7 @1 T" O# a1 l( h
    user-message (word "There are too many cars for the amount of "2 D/ A) T8 A$ M4 A  p: Z  j
                       "road.  Either increase the amount of roads "3 x  h) [7 q8 z# k2 ?' H0 t* p
                       "by increasing the GRID-SIZE-X or ") g( E* m, q/ h/ ?1 `& \
                       "GRID-SIZE-Y sliders, or decrease the "
6 ^/ D! a+ N8 k. y3 f% s, Q                       "number of cars by lowering the NUMBER slider.\n"& y' E8 o* G; H$ G" t' a' N
                       "The setup has stopped.")) K' y8 T/ e4 ~& W, o5 @7 d+ g) [
    stop
8 M' E7 l4 z' |3 D5 T  ]. N5 Y+ C9 |5 U3 K! c" E
4 W9 [3 k* [. ?# P7 z7 a
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# h7 t9 U1 n, H( x: l/ n
  crt num-cars( R8 z  f% ~1 L
  [
7 [) i" s0 G) J' C; z% a( G" G    setup-cars
4 K9 W( e/ i" ^5 ]    set-car-color# Q& |& E8 B: B
    record-data
+ O8 V" Q& V5 d8 v7 l8 L) S  ]& D% N" M5 ?; j, L, Q9 r
$ i5 h4 k& v+ i6 R/ J% l; G
  ;; give the turtles an initial speed7 h8 J( n2 I0 \! y9 j
  ask turtles [ set-car-speed ]
" V2 p( Y/ O) ]. W; e2 T* n' j$ V5 z. M
6 U; b3 L9 c: o  reset-ticks: k8 ~. h' Q; [. i, r, u' L; E
end0 }3 y' B/ Y% z5 Z4 _2 _8 J/ j. L

+ f5 a  {+ ~" O& ^" r;; Initialize the global variables to appropriate values
- G( X! t  Z  S( c  R& N0 a3 kto setup-globals
. i. Q, P; T2 P5 t' m: U+ x& }  set current-light nobody ;; just for now, since there are no lights yet$ [+ i5 ]  `0 z4 V* `
  set phase 0
& t0 B& U- c; o8 {$ [# X) y  set num-cars-stopped 0
5 }4 x* d+ }9 Y3 n% g  set grid-x-inc world-width / grid-size-x" n' d# c1 b1 ?% J' H( f
  set grid-y-inc world-height / grid-size-y
# B2 v) ?+ N; Y4 H5 f* C  g
! U& t1 E* _5 P. g$ M) o  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) c) H7 z1 Z" G# P: b% Z  set acceleration 0.099
( e/ f  j  [7 l$ a. B+ uend, ?: V) Z7 n1 A6 Z+ a
! u* P! q$ t; g8 N
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% S  y7 A# |& Q  F;; and initialize the traffic lights to one setting6 C. G0 Z; X* f. G
to setup-patches3 s( {2 e9 e) c' v1 E  S
  ;; initialize the patch-owned variables and color the patches to a base-color* a2 k' f8 k  _
  ask patches% d/ B# e6 r1 W; v3 W1 Y& R% R# `! P
  [" d/ U1 T8 U5 r
    set intersection? false' d/ n4 i0 Y. x  [9 Y2 g: m' v
    set auto? false* s6 m: x( Q8 R5 b0 Y& T
    set green-light-up? true/ F" E8 i$ L! ~% x" H, c: u
    set my-row -1/ i/ [3 E7 z- j
    set my-column -1
! \; o' n1 A  T2 x4 `) w8 r# A' R    set my-phase -12 V% a/ B4 Y& f: l& w. H, R8 l( X
    set pcolor brown + 3
% Q$ s# `) J$ [2 h  ]
' u1 Q& L! O7 f7 m
' l& G' t9 B- k5 i  ;; initialize the global variables that hold patch agentsets: ~2 J( _  _. w' ?" b
  set roads patches with7 P- ~! ^( |, l# `8 @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 O* T0 m% C# \- y1 p) F
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! e1 L0 W  F$ i. ~
  set intersections roads with( J: f! S1 [+ d4 m/ N; n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 z+ Y+ l- m9 u* n+ r# k5 Z) |0 k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ s' ?. ~! Q7 `! O9 ~
/ n- |/ U- p& F- i5 N  ask roads [ set pcolor white ]
6 [: Y' y4 w7 T7 m' g- l    setup-intersections
9 D6 O) P" t$ ^7 W+ F' _) @& \) Zend
  T5 C' P" `# M  Z* y+ @& G* v  ]8 ^其中定义道路的句子,如下所示,是什么意思啊?) W$ q2 Z# N) c2 p
set roads patches with) y3 X: G* r, ]; Q) D$ }: \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! b) K9 n4 ]. \) Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) S2 @, F' T, w
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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