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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 A1 j5 i' I5 u; z" Enetlogo自带的social science--traffic grid这一例子当中,
2 Z5 G( y8 ?7 S, Z+ R% xglobals& w+ |" Z; d, X0 O5 u( V: z
[+ q' k  B2 J0 i# i' o& f: W7 l, G
  grid-x-inc               ;; the amount of patches in between two roads in the x direction) p$ [2 U( h  V" o! N
  grid-y-inc               ;; the amount of patches in between two roads in the y direction& q0 ]7 @0 T% c
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if0 [- e7 g8 _9 p# s% k
                           ;; it is to accelerate or decelerate% q5 Y, I0 q1 o* W" E
  phase                    ;; keeps track of the phase3 F7 \" x# V# k4 s; E4 T2 |
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
- b% o# ^; m7 H, c/ m  current-light            ;; the currently selected light
: o3 t6 j+ n! U* I6 q5 W0 f1 p
' r$ e. t6 \* |, O. ~, S  ;; patch agentsets
' d7 ?; }" d* \  l6 X. V8 R& U" X  intersections ;; agentset containing the patches that are intersections  K# U* B& v& d1 w8 p( l: k" D+ g
  roads         ;; agentset containing the patches that are roads( ]) Q8 C; K9 r, Z6 H, l+ S
]
7 B/ r0 O4 S, @8 w6 R" D" K" k4 C% u& }0 @5 p! _2 i' [( `
turtles-own
  k$ y' J  v/ n3 u! m$ _[- G% U0 M* X4 }, C
  speed     ;; the speed of the turtle4 X2 d0 ^8 M' ~
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
0 \" [1 `+ \1 B! z3 w  C5 K; v3 b  wait-time ;; the amount of time since the last time a turtle has moved$ Q, l5 x# t' f1 c
]9 G) M# w7 G8 `5 Z9 N+ X
- I! L* L, V2 B6 W1 ]
patches-own, R4 \( g# F7 x+ e
[
4 z+ c9 c& x/ ]. e' T  intersection?   ;; true if the patch is at the intersection of two roads* k; F7 `4 S" S  L2 F1 ]1 c
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; t- I# J# Y. k7 S/ q& r6 o3 n) r7 }8 @                  ;; false for a non-intersection patches.
  w, Z2 j+ ?- D& E7 y; B  my-row          ;; the row of the intersection counting from the upper left corner of the# S' v6 _6 E% K# r8 Y
                  ;; world.  -1 for non-intersection patches.
& n, p; u6 l* @$ A% L/ W9 W( r! M  my-column       ;; the column of the intersection counting from the upper left corner of the
4 B! w# w5 w9 A                  ;; world.  -1 for non-intersection patches.' h7 h0 t4 r3 p  t! q( P
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 c9 g0 }: w+ _$ K9 q  auto?           ;; whether or not this intersection will switch automatically.
1 v: J& B4 w( A! y: w, e                  ;; false for non-intersection patches.
# x- E9 b# ^% {. u1 `# R7 t5 t]
) [- b6 F! n$ A! Z, L! f& d
1 p6 \: ]# ]- U
3 K1 \1 A. X& h& D;;;;;;;;;;;;;;;;;;;;;;3 n9 H; S9 T& F
;; Setup Procedures ;;/ i- N) B/ S2 J% z+ ^& U
;;;;;;;;;;;;;;;;;;;;;;
5 D7 h( t# z' }7 P. [  X8 a* {3 X, Z2 K0 B+ W0 V7 I+ r
;; Initialize the display by giving the global and patch variables initial values.
) T6 Z- W- N3 _7 N6 p: W* g, h;; Create num-cars of turtles if there are enough road patches for one turtle to
) v0 a0 d0 Z2 y+ C! H;; be created per road patch. Set up the plots.
6 Z5 x+ h% Z, Uto setup
0 N' i5 J; V& u4 J  ca
' P. e! `7 B1 o! }! p2 }0 D  setup-globals  [; G2 S. w  T4 k( ~7 X( k+ g$ o6 a
( z" \- W& s/ k7 Y  C7 J
  ;; First we ask the patches to draw themselves and set up a few variables0 U$ K  M: t+ C- j
  setup-patches+ ]& I5 ^' y  e
  make-current one-of intersections- o8 Q) v# a$ b: }+ d) w* g0 _8 a
  label-current) U" e- l. c& q6 s; Q" p, M7 r

9 T* _4 Z! s0 R8 Q1 A4 a  set-default-shape turtles "car"
, y% P4 z6 U: H2 X5 n5 D; ?3 K8 l
: c. \2 O2 L. N0 J$ E( s/ i  if (num-cars > count roads)7 D: l! k% O1 g$ V* k
  [
9 M9 r! [4 E* `' R+ a! L4 i    user-message (word "There are too many cars for the amount of "  A! R% u8 @2 x' K* ?& J2 {$ c
                       "road.  Either increase the amount of roads "
4 c" M  g7 T/ f8 O- `                       "by increasing the GRID-SIZE-X or "/ F* O. w$ r& X( b, p9 ~/ ~' K
                       "GRID-SIZE-Y sliders, or decrease the "
% i7 O' L9 e8 t: h% s                       "number of cars by lowering the NUMBER slider.\n"
/ d5 o* M4 E5 B" ]                       "The setup has stopped.")9 ?  v  Z' o" T8 H: C+ x+ A4 }
    stop
. R: K1 i& L+ }! t* N" _2 y  ]
0 ?8 g; `+ S( T) M( C  C
7 y9 e( d; E- h) C$ B  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 B/ r4 f& c' [: C; h8 x  crt num-cars
0 K' y% m3 p5 r7 T5 e7 u6 l+ z0 t  [
+ G3 i+ n$ [3 O- }. e    setup-cars
8 {7 G- j$ m" e3 h    set-car-color
; y' w$ m, `: m! ^% `    record-data
! w1 p* O& p4 l4 z5 `  ]
- ~5 j9 ^* Q! A3 }
) ^8 I, V  G) B/ T& x3 ^6 v  ;; give the turtles an initial speed
% `9 L) B; p& ]) F  ask turtles [ set-car-speed ]- V: r* R$ n- f" n/ e/ O, V. q8 F

% P" L2 t9 O+ T  reset-ticks
9 k- Z7 S, |6 C8 ~" Vend6 t! N" o3 c# J, h$ {/ \
( D9 j+ w9 r5 R" R
;; Initialize the global variables to appropriate values, x* ]2 z% _3 j% W
to setup-globals& p* t$ Y$ L6 _, Y# g
  set current-light nobody ;; just for now, since there are no lights yet
1 N4 K/ G  f6 g; D( \  G  set phase 0
4 v5 J9 `: z  S) a8 p  set num-cars-stopped 0
+ P: I6 ^; K& c1 Y! w0 @/ R0 n# K  set grid-x-inc world-width / grid-size-x
9 \2 r0 }# a8 b& A2 u$ F  set grid-y-inc world-height / grid-size-y; h+ q! y3 p  D; K, \
1 z( a# M( A! }
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& ~0 X& I$ ~: |- X
  set acceleration 0.099
6 h' }7 H* I9 k* A& {- a! Vend
4 l! i  Z, x2 n6 |6 X( F. ?
- E) W1 |8 [# `0 |7 Z& O' [;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
4 H* s8 Q" _( W" f# {) ^;; and initialize the traffic lights to one setting5 C4 X0 {4 g  R) O' g
to setup-patches
# s& q1 S7 n4 Y! G$ e( J' A( r6 \  ;; initialize the patch-owned variables and color the patches to a base-color9 D* H, ?) h0 t* ?
  ask patches
3 B! z, x$ x& m( w( V  [; I( d' _1 m/ A3 I0 m
    set intersection? false; l; v* w' b8 y6 b/ M, }
    set auto? false
9 F: Q. X; o" s( B' |. U2 `    set green-light-up? true
" d5 ]2 M# T6 t' c: W* t    set my-row -1
$ o  e" D$ v8 E. a' d4 L1 B    set my-column -1
) ~. j2 e& c- H& d    set my-phase -1/ D, S% q  l$ u. J
    set pcolor brown + 3* ^. v. E9 s; J7 T! o
  ]
) g2 h- V/ W9 ?$ f8 q2 c6 `, s' D; q  `: C& s/ }+ ~# z$ ~5 M
  ;; initialize the global variables that hold patch agentsets
4 o+ x0 L+ c& N5 H9 A6 W  set roads patches with) w$ n1 Z: [! ~& D( w0 {8 U, H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# d+ y# W6 O0 x$ e0 D2 D7 B! }. f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, I5 _- [' h  Q! q1 Q6 E' w+ ^  set intersections roads with# [- J- E; X7 V4 x: [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. \' {& p8 k+ O4 I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. t- R0 X; a  O$ f

6 C; V) x  y3 z5 s4 U  ask roads [ set pcolor white ]
0 w: R4 }1 Y. \; D6 v4 [# O' x+ S    setup-intersections  P# {1 s/ y+ d2 O; {7 p
end
/ j2 l7 ~; c8 j! ?6 B其中定义道路的句子,如下所示,是什么意思啊?
$ P- B% q" S& u& Z4 L! c7 | set roads patches with
. E$ R8 m* V8 Q0 m( l0 n# O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. H9 [2 ], v# z6 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- G  u. }7 W1 }: d. {# _- b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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