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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。
/ G3 \, [: D- H- N" A6 unetlogo自带的social science--traffic grid这一例子当中,
# W( m" S6 w3 O1 }globals3 T2 `& J- P1 l
[  I0 C3 w- R' O" H# A. [* s% ]
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ r# J8 t7 X% U; o, b: v( Q. W! s  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 f" S, n9 [7 H! Y8 A4 b
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
& O# j1 G1 I* g+ ]6 ?5 e                           ;; it is to accelerate or decelerate
# I' O3 V: [' A" D* t5 w  phase                    ;; keeps track of the phase8 ]8 X$ n7 U5 b% A3 T
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
; y# m" B* F! \  current-light            ;; the currently selected light% C7 b! ?2 T0 S+ l; ]1 a
8 N7 s0 P9 |; }2 c5 i% l
  ;; patch agentsets
: W: _# s( x7 N2 s+ K- x. s6 b  intersections ;; agentset containing the patches that are intersections
$ X# t, |( g1 B1 V  roads         ;; agentset containing the patches that are roads4 B" t5 X1 H( m0 g, m4 L0 D
]. N5 H6 A, q6 X; b$ O; i! v
2 w+ i* o! z6 y5 T
turtles-own- {  a: j* p$ h- f2 ]8 i1 j
[
3 j! x7 [5 W" m: {" t  speed     ;; the speed of the turtle4 j! _9 a! ~7 }0 s4 s4 @- l
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right. M" X2 _/ g% G4 ^4 W/ C3 e; [
  wait-time ;; the amount of time since the last time a turtle has moved0 _  d7 p" Y+ ^1 A- l& r2 O
]
3 v% x+ E* |, D6 Q8 _$ m" r& T6 ^7 {; Z# A8 A: `1 h. B
patches-own: I5 O2 @& t$ C& ^
[; h9 \+ B2 U( E. t
  intersection?   ;; true if the patch is at the intersection of two roads
# Z+ Q2 X' y7 U2 T3 Z1 a$ Y8 O0 n1 g  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.( ]/ l' o/ _( s8 K
                  ;; false for a non-intersection patches.
1 A3 h6 E! Y- G. g6 o6 ^7 f+ }/ g* P; O  my-row          ;; the row of the intersection counting from the upper left corner of the
+ a9 j( u$ \2 N+ L8 z0 k                  ;; world.  -1 for non-intersection patches.
7 k, ]& m! Q2 A; n& x/ {# N. H  my-column       ;; the column of the intersection counting from the upper left corner of the* r0 A* m0 A3 L* d* Z, \0 K
                  ;; world.  -1 for non-intersection patches.
0 Q) N+ e/ r  n& Q+ s6 a  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
) _- A" ^* \, D3 _  auto?           ;; whether or not this intersection will switch automatically.
: c3 s* O( r- |7 t                  ;; false for non-intersection patches.
7 h$ Y1 Z( X; A, ~$ y6 i]
  X8 d2 c( \! T+ i, v& I% ~: n2 B9 o+ p1 U1 r' O0 f

1 o  |3 b" r* F& G8 @6 g;;;;;;;;;;;;;;;;;;;;;;
4 ?0 }+ e* k+ K0 ]0 v; i8 H) w2 e;; Setup Procedures ;;
& h2 F" K) Z* S# p* c0 T: H& ]! X;;;;;;;;;;;;;;;;;;;;;;2 S" _$ e3 y: ^" ~) C2 e
& }; I( w/ v  S" y4 _7 |
;; Initialize the display by giving the global and patch variables initial values.
1 ~0 t  ?, j/ F;; Create num-cars of turtles if there are enough road patches for one turtle to2 J" n3 ^4 c0 y  x2 ?
;; be created per road patch. Set up the plots.
2 X3 |$ L7 H* ?' X( ~  jto setup
3 G8 E- f- Q& u/ u0 g" g- ]( S7 s  ca
% O$ N  I% B" d3 [8 h5 Z! I  setup-globals* S; k7 U8 x9 [* Z& t

1 a* [! l3 N8 s4 O. ^6 J. y  ;; First we ask the patches to draw themselves and set up a few variables: _7 T# `. U4 W7 ]
  setup-patches
) U$ h6 E5 |) O* j. z  make-current one-of intersections
: B' c# U" ?1 v8 t  label-current
( {" V. \6 X! v* m- y4 X
. J1 }9 B3 _0 ^/ E5 x' K  set-default-shape turtles "car"
3 n) W  y/ F, U( l$ R6 z
) J& p1 u" q) ]  if (num-cars > count roads)$ p* P; T8 [2 g. ?
  [% I1 X0 V/ v' C4 N# Y( v0 j
    user-message (word "There are too many cars for the amount of "
& _. a7 n& p% w5 l  x# j                       "road.  Either increase the amount of roads "
2 L" k/ I% P. u( C2 J                       "by increasing the GRID-SIZE-X or ". Y) }) X, I, [. ^7 @
                       "GRID-SIZE-Y sliders, or decrease the "
: Q6 L* \$ A' u- G2 f                       "number of cars by lowering the NUMBER slider.\n"
; V- @+ F8 c1 U2 J. x* P                       "The setup has stopped.")4 j7 o" Q2 T. T) l
    stop
% j, i. E& C& h' k  ]: u7 H# p) l' f7 ]# M5 M% P

. Z! f) t8 T- a5 o  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' C! w, q% C' r  q7 T  crt num-cars
" @$ p0 e: g4 r! F8 A" a5 ?6 R+ _6 U  [) A0 ]  w+ e, \1 _5 x
    setup-cars7 L/ ^1 `# D0 |$ o
    set-car-color# L) P- N5 k3 }; T7 H
    record-data
2 C" T) L& _) V* \  ]
7 `1 n$ |. w! W1 M& @( D( M$ `8 ~+ M8 F$ y4 K( T; n' O- v  }
  ;; give the turtles an initial speed5 i8 f% H2 M+ K& X- e3 @
  ask turtles [ set-car-speed ]0 ]- i4 u/ Y: u! u! D" I
8 e+ S) G  V/ w) w1 d: C
  reset-ticks. u3 x6 R+ k, T* o3 S. s7 r
end$ ~- o4 H& v9 G! n% r) b: ?

3 X3 D" w/ n/ U2 _7 f& ]4 j& i;; Initialize the global variables to appropriate values
6 R9 F5 M& ?3 H/ zto setup-globals& k9 p* h3 z/ I6 h: e9 ^& V
  set current-light nobody ;; just for now, since there are no lights yet- Q3 q2 Q4 a- m8 _: C$ |
  set phase 0
' ~* }, R) C$ g6 f  T3 s0 J. ^& q% S  set num-cars-stopped 0
& R/ w! \% {) l! z7 c$ c* e' S  set grid-x-inc world-width / grid-size-x6 Q/ ]) t" U# O2 N5 S- A
  set grid-y-inc world-height / grid-size-y
: ^  G0 `( m! y2 E0 W4 z" i) P' @; S+ u4 j2 U4 D; ~7 e  C! Q6 ^
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  Q2 ], s. c0 @0 p  s  set acceleration 0.0999 O) {2 _+ m8 W* j- q" w' n: k
end
+ t4 B9 n% @8 ~8 k- r8 w# w
3 q9 Q" U2 s. H: B' t;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ V9 }; a0 ~; b. h5 Q;; and initialize the traffic lights to one setting
* O  m% [+ s& xto setup-patches) `3 F, ]3 n  S" v2 t
  ;; initialize the patch-owned variables and color the patches to a base-color
* I7 z$ X+ g5 n  ask patches
2 C$ ?1 z4 h) x  [5 O* h' G& B1 A+ B2 R1 c/ d
    set intersection? false) c2 D! q6 r/ p* W9 K6 C- T
    set auto? false4 w* r% M5 D) L" m9 u: C- f
    set green-light-up? true/ I; `! \. {2 S& p3 Y' A4 R& R, G
    set my-row -17 v2 q% L8 s" p! Q  C1 k
    set my-column -1- i% v+ ?! i9 ^8 W; M
    set my-phase -1
- r0 b4 B, I; H) N$ q8 f    set pcolor brown + 3
7 B- M5 x7 v7 G/ U* Y( u  ]
. f! l6 S  n- Q) y0 O0 i6 l
( b' E0 J- f: `' o0 n  ;; initialize the global variables that hold patch agentsets6 ~8 g! [' g' K$ O. E
  set roads patches with, m* ^! y+ h0 s$ l! P
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ s6 V% s+ E+ V; D2 V4 ^) N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  P/ M- i( I8 G
  set intersections roads with% c/ l8 w6 j; C7 K; R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: M) q: D: Q0 ]( K. V4 I3 \( S$ L    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- `+ K+ I1 m0 Q
* k0 c. j1 D( M2 g/ R/ \
  ask roads [ set pcolor white ]; e$ E2 n" T  \! X+ [$ d' C5 m: A: i
    setup-intersections
, D" [" i8 f% F  ~& k% [9 Yend
' O: \, h' ]! N2 b1 @0 `其中定义道路的句子,如下所示,是什么意思啊?, U% \- \/ L' l- Y: j3 q& W* Y
set roads patches with
4 U  s. f. k  ~: s3 N1 C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" I5 u  e/ g1 ~4 l
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ d& ]& v- O) x# ^5 M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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