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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。
: [& [3 r5 S. y7 r8 v1 enetlogo自带的social science--traffic grid这一例子当中,
0 ^" h0 M6 P- a- ]3 O3 aglobals" [" f; ]  N" X" }: r
[
( y8 u" i1 ~5 t" R/ ]  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# O# w, n0 R; {; ^  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 b, Q; |0 r' O, `% }  acceleration             ;; the constant that controls how much a car speeds up or slows down by if/ }1 V" e4 ~2 k1 G
                           ;; it is to accelerate or decelerate
# T4 T3 M$ v' V- ]9 K  phase                    ;; keeps track of the phase8 ]) p+ z4 o3 k! h! }7 a4 f
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure6 ?; s" {7 a/ x% M: P
  current-light            ;; the currently selected light
; e% t$ o; Z- {+ ~$ q
) Z6 A+ O, o+ L* K( V9 A. e  ;; patch agentsets+ q- U& I. N( b. ]2 U* c. d/ [; W
  intersections ;; agentset containing the patches that are intersections
) C  [# l. D" h/ f! n  roads         ;; agentset containing the patches that are roads
9 `0 s% b2 ~' `4 c2 t- W]
* R" S& O7 |: s) ?3 G9 V
4 F. r) ~4 G: @& N/ _  Zturtles-own3 l. S4 g$ ^* \6 }
[# E) H; u6 h- F" z1 v
  speed     ;; the speed of the turtle
9 Y- P) a2 {* d9 f- V  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ u# T3 ?. e1 Q1 l7 P; J1 n* Z
  wait-time ;; the amount of time since the last time a turtle has moved% @! A" N2 {+ q  z% z/ p, Q
]" Q% c4 }( A2 ]9 x- r

: h0 o6 J7 z! t# ~+ Kpatches-own  Y% }$ R, z4 m3 Z4 D% I
[
& O8 O+ @# k& g2 k# e  intersection?   ;; true if the patch is at the intersection of two roads0 q$ E9 t$ C5 V! H. x  E6 \: b
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 N- p! q/ S1 {                  ;; false for a non-intersection patches.( k2 s' V1 W: ?1 _3 y  {& q
  my-row          ;; the row of the intersection counting from the upper left corner of the- f0 @* B+ r+ s
                  ;; world.  -1 for non-intersection patches.4 u  h, h; n1 t+ ^- A$ T9 b/ q
  my-column       ;; the column of the intersection counting from the upper left corner of the
; ]& o5 m# f& B; O, a8 _                  ;; world.  -1 for non-intersection patches.
0 p& U5 n7 q" `% q8 I& I) x  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( }/ z0 b" v# X2 P% k# s
  auto?           ;; whether or not this intersection will switch automatically.4 V" `- D" Q+ z6 E" f5 x% Z' |
                  ;; false for non-intersection patches." h: z( W. Z# \' @- o9 c7 ?
]4 ^3 d4 r% T3 v8 @4 ]4 K! {
: U# K/ E' b" w! x1 a* Q
3 G0 k2 C1 \( ^3 F  v& H
;;;;;;;;;;;;;;;;;;;;;;% C( ?! t; F9 G% ?1 X; ^. M3 m
;; Setup Procedures ;;+ P! l4 ]" n" A
;;;;;;;;;;;;;;;;;;;;;;
+ Y; f! y  k2 N) r: D
( I: [; Z4 i! U2 m1 g1 X5 Y;; Initialize the display by giving the global and patch variables initial values.
2 d0 @& L% j# V/ Z" L+ e;; Create num-cars of turtles if there are enough road patches for one turtle to
1 U! ]* @0 N# }5 Q3 @1 ?5 z) ?# T;; be created per road patch. Set up the plots.
0 c" C' y1 J* b0 t% rto setup
+ H0 ]8 D2 x; M4 d  i( u  ca
+ B8 V1 D- o1 B, F' d3 a, @5 q( r8 s  setup-globals
: s1 g1 X% n# e* E$ J
# _  x! O$ i6 R1 ^0 i  ;; First we ask the patches to draw themselves and set up a few variables
) a9 S) M  |& E5 I' Q4 v$ k  setup-patches
+ W, Q- t! L1 Y6 U) e  make-current one-of intersections: X  f* O6 M; p5 M6 i  `4 ]" b$ U1 b
  label-current
. }. G. G5 I, U/ ^' c  ~  o5 u; v6 A$ H+ |. y' l5 Z3 Q! I0 s
  set-default-shape turtles "car"9 r' k! U0 {+ u& g! ~1 M, `

( w& g3 C" K4 J( x$ b1 [0 Q1 f  if (num-cars > count roads)+ C' D" o9 V! V6 Y6 e, E( ?5 ~
  [) h1 z  A3 q' d+ M
    user-message (word "There are too many cars for the amount of "
3 C5 n; E3 _) U                       "road.  Either increase the amount of roads "
% C! F' \( w8 E9 j* G                       "by increasing the GRID-SIZE-X or "0 s+ ~/ I4 ?( Z+ X' h2 b3 u+ N' r
                       "GRID-SIZE-Y sliders, or decrease the "
4 k0 ^# K" c# ^: p/ H                       "number of cars by lowering the NUMBER slider.\n"
: F) L- |- |+ t; L4 e; k                       "The setup has stopped.")
" k5 k4 O0 N" G5 D9 h' b    stop) q: F/ @6 p% e/ O  c: l
  ]1 D/ J) y7 S! Q' K' i

/ _7 ?$ k& J! n" c, b* F" w/ J  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% L- I9 C0 x9 g& B* |+ e/ o  crt num-cars; K) Z$ A- e  n( u
  [
; U6 n4 E) g4 l( f, C) D. n8 E; j    setup-cars
5 E0 ^" Q; W& x$ [8 @% T6 [3 h    set-car-color% Z, C/ w: r( B% _' e$ ]* A" y
    record-data; ]& w3 B/ J+ }4 L- P/ u. y
  ]
, g0 o6 H8 s9 N- r) R1 C$ l' z% t3 `. E/ s
  ;; give the turtles an initial speed
0 l7 h, |: |1 Y5 G- m  ask turtles [ set-car-speed ]
9 `5 V3 Y5 ?$ ^+ h$ @) p2 G5 @0 g0 [, j: H- d( w
  reset-ticks
; e4 y- ?5 ?3 W% hend
( z* s) {; ^! E& o. b/ ~* a+ O% o1 W
. e3 q2 N) Y8 h) j8 m" E  d. ^;; Initialize the global variables to appropriate values4 ]9 {) }3 _  Z# `3 w4 S
to setup-globals
) s/ S- E6 u9 W8 E: ~! D' p% F  set current-light nobody ;; just for now, since there are no lights yet
" r% |* x/ u% f7 C  set phase 0% c* Y7 ~! D0 a0 {' R6 X
  set num-cars-stopped 02 q0 L5 f6 Y/ v! u/ s8 Z% h& i& h
  set grid-x-inc world-width / grid-size-x$ v* o7 d* ?! Q, b; y! ]" N3 b9 H, D
  set grid-y-inc world-height / grid-size-y" p- y# H/ I! |* i  @

- M8 o1 {1 N3 k& y9 _7 Y  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' u7 ~! r3 a: h3 e; I1 r8 I0 D
  set acceleration 0.099
6 X- t' j; o; o: j/ v8 r6 s& l5 Mend
5 P& h: e; ~7 T2 {0 P* b& ]( o' l1 U4 b/ Q+ C
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 a7 o) F5 L6 n# [' H;; and initialize the traffic lights to one setting# I0 m+ }- U* Q8 T
to setup-patches, ^9 U) c5 l. Q* o' ~' D
  ;; initialize the patch-owned variables and color the patches to a base-color, h9 a8 ]- n. e: n
  ask patches
8 [! n8 N3 E/ o) V5 R2 ~$ a  [! Y4 N$ U! m+ T6 i- G
    set intersection? false, A" T% l* G3 y9 x+ b- l
    set auto? false
$ g# i3 P  y  m+ x    set green-light-up? true( R# s5 k- F$ b* v
    set my-row -1
5 s- K' S1 u) r4 d    set my-column -14 d# u( j7 O8 V2 z' ]# M
    set my-phase -1
/ t9 z' t: @. s. G, Y$ E( `# d    set pcolor brown + 3$ @- P' A6 c- b# V
  ]
/ x1 G7 g) m6 R5 C* q
( {8 [/ h/ O2 z; G4 @  ;; initialize the global variables that hold patch agentsets# B0 }$ O' j3 |3 ~; i, j  S' ^
  set roads patches with
  u8 a% x+ s- L  v: q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% H1 Q% s3 Q' U9 o# D& B2 O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ y5 Z( J5 m9 \' B7 u  f  set intersections roads with
  w) }, O$ \2 B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# f: `4 S- L+ y% y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ B9 n6 p; D: H
. {! e* p& T  j# x0 Q, }/ s  ask roads [ set pcolor white ]3 o# @: u7 j8 S6 G2 R
    setup-intersections, j9 K0 z5 W+ Y+ _* |9 k
end
! x' z  i0 f; ~+ l, r; Q( u! U2 C其中定义道路的句子,如下所示,是什么意思啊?
; V$ i; m' A6 u3 X: i# e) M set roads patches with( H  H; z- U3 o# K+ w* x: t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 Q6 K# A  ?8 c3 ~) j$ u* h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. m4 s$ e# X8 E( Y9 g  L
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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