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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。
; L  l, u9 z8 w4 Lnetlogo自带的social science--traffic grid这一例子当中,  E% R& |& D6 Z5 u* {
globals
+ E+ r- c1 I0 _; [0 Z6 J[. I6 P/ k5 h# }6 S
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
( Z( R( V5 k  Z. _' l3 w9 b  grid-y-inc               ;; the amount of patches in between two roads in the y direction
3 k% n) q' Z7 @( z2 n& R5 W; C  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' }. [" @- }; l3 A( O' r; w2 c
                           ;; it is to accelerate or decelerate
. b1 P7 h& S. H4 |& Y  phase                    ;; keeps track of the phase
1 q: S% E' w0 U+ }  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
' z- ~% j$ l' H; n% J  current-light            ;; the currently selected light
. f8 j8 q( Q9 W' H: N% p* M/ p6 V* ^( {; p' u; E
  ;; patch agentsets9 W7 j5 ]6 j- i8 x0 _
  intersections ;; agentset containing the patches that are intersections
$ j2 a- ?1 Q2 D: w" k8 w7 D  roads         ;; agentset containing the patches that are roads
- V5 b5 V- r0 U# Q* r]
' i2 b' T. ~" s5 M3 r4 q) i' B! l! C# N# A0 e7 [& y4 J
turtles-own$ n4 C2 Q1 L& c, s, n
[- b7 @- v' w% n: W, u& A, m
  speed     ;; the speed of the turtle3 H8 E& g+ C* s8 s
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right  P0 l+ P4 O9 O1 E$ n2 V
  wait-time ;; the amount of time since the last time a turtle has moved
( a0 p1 T. D% W2 c9 I]" O1 a) L8 B3 M
7 b5 V6 g9 z& n5 [" O
patches-own! R- A1 L" @8 m; e: z
[
2 u0 ^' ]2 |1 _3 V: w8 ~  intersection?   ;; true if the patch is at the intersection of two roads; P. ]5 W3 _2 X# T, R, M( F
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 P. Y$ S9 |/ x' P9 k                  ;; false for a non-intersection patches.
; q6 `% D/ Y4 k6 Q* \8 R  my-row          ;; the row of the intersection counting from the upper left corner of the. }% h$ w! e$ y1 b2 e
                  ;; world.  -1 for non-intersection patches./ J4 _4 ^4 \) X- ~4 R
  my-column       ;; the column of the intersection counting from the upper left corner of the
5 a$ f" B+ v6 `6 \  [( c: q                  ;; world.  -1 for non-intersection patches.9 g6 ~3 v$ `& d2 u0 x
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
3 M0 }% w( _1 v0 r- o) g/ D  auto?           ;; whether or not this intersection will switch automatically.
- }1 X+ t! L/ g$ L7 c0 G5 R$ v) ]6 u                  ;; false for non-intersection patches.2 s' P+ D$ M1 w' W* U! Y& E+ S' q
]0 K6 e. s, E  x- Q) q+ P

8 ~+ G6 z! \: x9 P$ g
1 f. y5 R  ~& N;;;;;;;;;;;;;;;;;;;;;;
; m% J1 t( J* D+ {4 s;; Setup Procedures ;;# B9 M0 Y) j" V$ t$ Z+ x# h
;;;;;;;;;;;;;;;;;;;;;;
8 Z  f, [  {, d& [0 Z
6 [0 a  s9 Z$ Y: V! n6 X+ E. };; Initialize the display by giving the global and patch variables initial values.- ?& X; V/ A/ e- k& S4 D* p6 g
;; Create num-cars of turtles if there are enough road patches for one turtle to
( H& z+ z0 E" @) i* k) h;; be created per road patch. Set up the plots.' M3 z* n  G( a
to setup( e: l# f, C# k2 m, [( q4 j: f
  ca
9 S5 S! Z- ]# F. |8 C( ]  z4 I  setup-globals6 Z% j+ \- Z# t8 m# j
. m0 E/ Y% A2 y
  ;; First we ask the patches to draw themselves and set up a few variables
1 F! J! M; m& J9 q3 x* O4 j! B# n" w  setup-patches
. L" \+ E4 n% V5 \, Q  make-current one-of intersections  L' h1 k5 [" N% l# s  T
  label-current% ^; u5 N) i2 ?. J2 ^% U
8 ^# R, g5 g0 {% p) F% \7 w, b
  set-default-shape turtles "car"* f2 g9 D' z8 w+ u: z

7 a  L! `' y& z, ^! n* ~  if (num-cars > count roads)( P1 i1 X3 f7 y; F, Q2 M+ G
  [
' W( \4 G! t! x) ?/ Y# b    user-message (word "There are too many cars for the amount of "
3 Y3 V' W) X; N0 `. U                       "road.  Either increase the amount of roads "
/ M3 r$ M% @! l, p3 ~                       "by increasing the GRID-SIZE-X or "
4 Y" @5 W, j& x* J7 Q+ N                       "GRID-SIZE-Y sliders, or decrease the "
. c2 t+ S2 F  m5 J8 ]                       "number of cars by lowering the NUMBER slider.\n": B) I; m6 L  j2 F8 S' G
                       "The setup has stopped.")# U! i) d7 Z# w1 j# Z9 Q, N
    stop! M3 a: c/ Y, v5 \7 F4 K0 O. u
  ]
% s2 c; f1 `/ Y* M4 C& S* |9 v
& A8 T' u2 e; m3 K1 |  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 Q. O' ^% y8 A0 U
  crt num-cars9 l; W2 N, z( n' ?
  [
  \* w, Y$ O5 d. r    setup-cars
$ P7 m- I8 _4 E! w; w' y0 h7 _$ W    set-car-color( {2 w" u0 f! Z  G4 O
    record-data7 u# O+ m9 p2 H4 a, V5 T
  ]
; c+ d5 _( G" Z' I8 ?1 j/ \% X: {8 Q9 S, n. p: T3 L/ S
  ;; give the turtles an initial speed
9 u8 G$ W2 i% _. Z  ask turtles [ set-car-speed ]
" v1 `7 c0 V8 S" A+ r8 R# g
+ L) ]' l' r5 I* o+ q$ j( z5 ?0 k  reset-ticks
# c: i' z' i; [6 n  oend
# j$ ?  ?. O, \* ]
/ r1 Q8 B/ S: H( n& A;; Initialize the global variables to appropriate values
* y& }4 m# f- B: M9 Vto setup-globals
+ a, d3 n1 k& p. \  set current-light nobody ;; just for now, since there are no lights yet
" h: F( H. x# `! n2 L* K  set phase 0
& ?; O9 Z# g6 ]& B! S- X) n* x  set num-cars-stopped 0
5 Q8 S( E  i; \' X& [  set grid-x-inc world-width / grid-size-x
  r/ p/ E0 q; |  set grid-y-inc world-height / grid-size-y
2 r$ r! z2 y, r& D2 ^. M
4 p% {( v3 o' n! I+ k  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" k# q7 I  ~- U7 _! ^6 V8 ~* ?
  set acceleration 0.0994 T0 i9 W4 Z" \7 V/ U" ~$ R
end
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( `1 [) g2 K2 _; I: k$ A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& [# ]# F$ C4 m+ s' C;; and initialize the traffic lights to one setting/ T8 e) |! f( M
to setup-patches
) G  E; B( O9 ~' X1 @  ;; initialize the patch-owned variables and color the patches to a base-color' u6 V& E- b) Y  ^# y
  ask patches
+ y7 j7 \+ Z9 C3 ]5 h) z6 O' R  [
4 G$ Q: z$ v, [; y; D  b) f    set intersection? false
; t4 R1 |% d. A& l  ?    set auto? false& k, F0 ]! h" @; d" H- [, a6 {* e
    set green-light-up? true. n/ i  v% i4 n" {4 n
    set my-row -1( o5 S+ v( p' ]' T+ u+ e, w
    set my-column -1+ ]" m  w: p. d: x
    set my-phase -1& L. g- p: y& U0 c# U# c6 M0 R
    set pcolor brown + 36 w3 ]/ M8 z0 h: f
  ]
# t; U/ M. Z$ w3 F# Y1 _1 K* F3 E, k+ y' {6 M8 }1 D+ l6 @: w$ Y
  ;; initialize the global variables that hold patch agentsets8 }. o/ e, J1 }
  set roads patches with
' D" f: w% v* \' s: j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# R/ e! o3 _. v9 a3 Z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( J! {7 k) z5 ]5 f3 Q5 }; ]+ @  set intersections roads with: g! H% P  J. d6 [  R7 o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 e* g' z9 r% }8 t% h9 F1 B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ V/ R; t! x( l6 M- s
8 v4 g: u- q" ^1 w7 G  ask roads [ set pcolor white ]* O/ g* Y' T: `6 N
    setup-intersections
# o) i  p1 t. m+ i  h7 G$ Oend# z% K% I& G) B9 E
其中定义道路的句子,如下所示,是什么意思啊?
: s' R( O  K7 k% i+ I$ B/ P set roads patches with
- |0 S% \) h6 K. r3 N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) f6 F3 E7 z2 r0 k
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' q; y  d' r+ |# [/ l' X7 R4 Y
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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