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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。
: e8 K8 g2 [, F; g1 d2 ~netlogo自带的social science--traffic grid这一例子当中,
) N0 T1 |' D% hglobals
' }6 C- \# N: _% Q/ Z# a# N; L[/ c& [0 h9 {% A; Y. g- z
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
6 d+ s+ j0 Q* v5 Q7 b  grid-y-inc               ;; the amount of patches in between two roads in the y direction7 s) {% W' u* ^" Y# F
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
4 U+ y& \" L/ h  n2 o+ E4 [                           ;; it is to accelerate or decelerate. R& Z/ q8 l7 D5 i
  phase                    ;; keeps track of the phase
6 g$ E: `9 d% V/ v, \  J$ T+ Y  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  B) C  S- g- z- P' V
  current-light            ;; the currently selected light; g" n0 l) t3 B: v4 ^( P% q0 e
: O7 p7 k6 s: M
  ;; patch agentsets
: z# m  y1 b) P' b# S  intersections ;; agentset containing the patches that are intersections
' Y7 p5 ~' W4 o1 r2 D  roads         ;; agentset containing the patches that are roads6 s! J" u7 d: [( `3 f% I
]
* v0 Z( \. T3 y1 G" _
! [" m0 T8 T5 N4 H$ g" E: j$ ~turtles-own
8 k3 U: ?3 U& i" }[6 H% K" m) f( r: e* E
  speed     ;; the speed of the turtle! s6 w* d! X1 _; G
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
# Q! Q; s0 v  }! V7 P( u4 q; u  wait-time ;; the amount of time since the last time a turtle has moved8 f2 H" @; g* ?, D6 G; M" r$ o) g! M" E
]
" S( Q& h) K& `+ j( p3 \
3 O9 @; c$ a" r! epatches-own
) i9 g: B; G8 i) [) Y+ m[4 {, m  ]+ G$ x/ b5 ?7 u
  intersection?   ;; true if the patch is at the intersection of two roads6 Z# \, i2 v" P
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.( ?% w8 u" B2 u( l2 x$ P
                  ;; false for a non-intersection patches.6 C! _9 g, \# d6 r/ f4 D
  my-row          ;; the row of the intersection counting from the upper left corner of the
$ _  p4 H3 w4 \8 R1 Z                  ;; world.  -1 for non-intersection patches.: s" L' t5 I. t7 E1 `$ {
  my-column       ;; the column of the intersection counting from the upper left corner of the
6 T8 u# [3 I* d6 W7 n. E5 o5 E. R% Z                  ;; world.  -1 for non-intersection patches.
+ g6 L3 w% d" M0 @7 C  _' ~6 O  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
- W; b9 G2 t* a5 v$ I1 h3 ?  auto?           ;; whether or not this intersection will switch automatically.( H& A7 A' n7 p7 i" L" `5 b" e3 R5 w
                  ;; false for non-intersection patches.5 W* R0 c( m( t
]
% I$ o+ F1 S) ~3 ]5 z; K2 C( J  O
, ]3 h' O1 w7 `( i, g- @  k3 ~$ X% I- P- l! x
;;;;;;;;;;;;;;;;;;;;;;# m3 s7 m' @4 L' L: j
;; Setup Procedures ;;8 q/ V. t. n! ?1 e& z' K6 r1 N
;;;;;;;;;;;;;;;;;;;;;;
7 B- {+ |5 Z+ M, b' g, j0 g. J- T: ~* _# I+ p8 Q8 g
;; Initialize the display by giving the global and patch variables initial values.
. U4 a6 q3 y9 |, Q+ u;; Create num-cars of turtles if there are enough road patches for one turtle to
+ [5 c* `+ ^1 |! H$ {) ]- X;; be created per road patch. Set up the plots.
  _, H9 x2 b! ~' jto setup
+ c; n6 l% O1 ~8 Y- p! c" [3 f  ca
/ F8 C1 \6 I( d0 s3 e) \. w) e8 `  setup-globals0 N1 C0 `0 f: t5 Z$ r. J, T

" b. c& F+ K6 o( b5 g) {; M  ;; First we ask the patches to draw themselves and set up a few variables
0 L7 s& V8 Y- \$ z; z" d& y2 q: g  setup-patches
/ Y$ I$ M% F1 j3 j  make-current one-of intersections7 }: X2 o7 U& E: m
  label-current6 u8 Z! C* M3 Z' c! ~/ @3 d- F

0 S* F' S# e$ K3 Z, _) j  set-default-shape turtles "car"+ w0 f9 Z* R# t; b% y
6 e. ^  p" X% B$ H! N) Y! T3 p
  if (num-cars > count roads). V4 A4 R' A) H+ [7 J
  [  ?! _0 B) o: m0 l4 O6 k
    user-message (word "There are too many cars for the amount of "! l" H) k3 a: n8 s, ^
                       "road.  Either increase the amount of roads "
- E& l% Q  Y4 s( U; F                       "by increasing the GRID-SIZE-X or "
% @0 G6 a) l3 C  F                       "GRID-SIZE-Y sliders, or decrease the "$ U( d$ \/ j$ O
                       "number of cars by lowering the NUMBER slider.\n"+ a/ a/ x3 C2 O* l& Y( Y% U$ ]
                       "The setup has stopped.")' o, X+ ^( ^/ V$ b. o
    stop
; z: |# C+ @5 C4 D6 ]9 a2 a  ]$ V* `+ v. J: v& Y+ T& O# \
1 M. w' O! A! T. N
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 j  N, P) Y8 v$ U& O/ I; s* b
  crt num-cars
9 I( M! H, J) z0 ~. l2 [) w+ S  [
! k  q5 X6 \  ~- p, y& b! R    setup-cars+ }" ~8 a: g7 F( s
    set-car-color' {' t# h) ]* u3 T
    record-data
( ~& z' ]1 i) C, }- X# \: o  T! A  ]
- R7 A, ^$ q! P0 ?) I; Q! K' J  p, N( E* q% x) ~5 F/ |
  ;; give the turtles an initial speed1 c5 ]$ S& `% y1 f( I3 Y
  ask turtles [ set-car-speed ]
/ t3 u* f# n5 j/ @1 ^$ _3 ^% k0 l8 x6 f
  reset-ticks0 J; {& [. O: b; n' ]9 K; a$ M4 W
end
% w$ u3 I. ?# r- ~; w$ D
' d* E, e9 m' f8 ~3 U;; Initialize the global variables to appropriate values
" m8 g8 o$ C2 a& Q8 X: oto setup-globals
& h% E0 v: V! Z9 p  set current-light nobody ;; just for now, since there are no lights yet
: q& @7 q  S; a- Z' z! P( }  set phase 0
* E% A9 e* |0 Z, r  set num-cars-stopped 06 ?5 p) Z; x+ d% G. k: H
  set grid-x-inc world-width / grid-size-x
# h) v# A, a5 L4 C5 m0 I  set grid-y-inc world-height / grid-size-y
0 Y) D' u" X& r" _* d" p' A- W4 V; n  t& @: E
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ K9 v# Y+ r4 I; d
  set acceleration 0.0997 F6 {, s. a0 y9 L: a' r! Z
end/ V- p& S' G+ D& \" P; C$ Z
% |8 q3 B0 j0 }7 ]: B# @
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 W# C  R/ d  x$ |;; and initialize the traffic lights to one setting
3 i9 f) r% V; z8 u7 V: z' hto setup-patches
  v+ x$ ~6 H. k4 d  ;; initialize the patch-owned variables and color the patches to a base-color
5 k. n1 S' N8 b" s  ask patches
% M) d% r* i$ u/ J  [
" F: B1 i6 h3 F+ u+ g: w! A    set intersection? false, |! l& ]  ~7 k9 n, d( V
    set auto? false% X* L+ k! d$ D, D
    set green-light-up? true* q5 v9 I( m% ?
    set my-row -1
" h; f% u7 g" R4 G4 y9 ?8 }    set my-column -1
& W) z5 T+ A6 t" e, w    set my-phase -1
$ i# f5 G6 k' L3 L5 N& [    set pcolor brown + 3
+ P, l& n! U/ I$ m# O, x! W( H8 O  ]! \7 A( F/ y) [* c/ Y3 h# e  W7 M
. `2 b* j* Z; w2 r+ g% M
  ;; initialize the global variables that hold patch agentsets
) z$ s+ x0 ^; |4 _& k  set roads patches with
6 V. Z& M0 @6 a$ D2 U. U' B4 [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 M. G4 U& H1 L2 w$ ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 f( m" y/ X& V! C; m4 P  set intersections roads with
/ g# w2 v( q) K1 y1 \1 S* ^) u7 }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# \( R- I: R' c5 B+ I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% }1 S/ a$ ]; O( z* m
/ v4 `3 J0 |1 v6 H
  ask roads [ set pcolor white ]
6 P6 ^% @' x7 ~. K$ j# k    setup-intersections- i" }3 S# d$ l9 y: ]0 j
end
: F# B9 G5 i* V! U# Y- n其中定义道路的句子,如下所示,是什么意思啊?
. R( B3 O; q/ d$ k( T7 o; z set roads patches with5 t% F+ ^1 l- M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! \9 B. M! }+ n! C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* W6 p. j% d; h1 u  }3 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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