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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。
* J; O8 b5 n- S- c( Cnetlogo自带的social science--traffic grid这一例子当中,
2 I% Z# y7 u9 i% c6 F6 K/ iglobals
3 b7 C6 a, p. ?  y& }. {( X  `8 W[
# x# G( E$ ~8 J  s  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 J! }( x  ?$ C8 S  grid-y-inc               ;; the amount of patches in between two roads in the y direction, G9 X3 P# {- @
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 a6 \6 B: w6 L- T
                           ;; it is to accelerate or decelerate; z: C" f7 R* a' ?6 i: l
  phase                    ;; keeps track of the phase% c* Q6 g7 |1 v3 Z+ W. d$ F
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure/ T: O7 C. M9 i3 B
  current-light            ;; the currently selected light
) f+ M9 |4 `- Q  _) K' W# a
2 j0 k, B" z+ L  D  ;; patch agentsets! `1 y1 @" K2 b$ T
  intersections ;; agentset containing the patches that are intersections- ?7 G  G; r/ U8 y% n
  roads         ;; agentset containing the patches that are roads
$ \* B7 P; E+ c4 U! i: P]
8 c1 F' G) d: C" W  J. {8 ]
1 C' {0 g, d- \+ _; r8 dturtles-own
0 U4 c6 _; e9 O; K9 O8 I/ o$ a[) `2 Q$ t; N! B8 e
  speed     ;; the speed of the turtle
1 u4 `6 ^# w2 h; ]8 g9 d  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: \' A: g0 T) A7 U: i
  wait-time ;; the amount of time since the last time a turtle has moved+ R/ D1 F5 C4 o- G3 t4 S: U
]9 K% Q# W# a0 `* M

; b1 {$ @3 @) J6 |- Wpatches-own- V, O6 Z4 M. u" ^
[
8 @6 m8 i: [9 I# X  l6 ~  p  intersection?   ;; true if the patch is at the intersection of two roads
& K. f  Y0 m; }1 H  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ L* y  s/ b8 |8 @9 @
                  ;; false for a non-intersection patches.
" c+ a* r6 q( E6 T- `  L1 O$ n. B  my-row          ;; the row of the intersection counting from the upper left corner of the
% L/ `/ E" S) R+ p4 X) S                  ;; world.  -1 for non-intersection patches.
1 ^& W  [7 x8 y4 f  my-column       ;; the column of the intersection counting from the upper left corner of the
2 B7 g4 S/ m, ^) o) r                  ;; world.  -1 for non-intersection patches.
; `9 T2 k1 q; t! j( k" I7 J- }  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; h) N+ O3 Y' O, w
  auto?           ;; whether or not this intersection will switch automatically.5 J# z6 [# t9 B$ r  Y) m0 R
                  ;; false for non-intersection patches." v# A0 @4 u. U. D, Q( U
]3 o: ^: {# [; T; Z

" [; v$ S# }, n8 G. i
- v0 f- t) |# }; D;;;;;;;;;;;;;;;;;;;;;;
8 P8 G* A' |5 Y# E;; Setup Procedures ;;
: U: l  b% ?1 M;;;;;;;;;;;;;;;;;;;;;;
  p- z6 m/ c! i2 }6 T) v  h3 X5 v( z+ m: [' y$ R, [7 E% G
;; Initialize the display by giving the global and patch variables initial values.
7 H# t" M0 {  [5 s2 V! I' [;; Create num-cars of turtles if there are enough road patches for one turtle to# ~) f- W4 x! @/ C8 ~  E/ l; k
;; be created per road patch. Set up the plots.  |/ O' W+ I: E) [. s
to setup  a5 ^1 O+ @3 w# X
  ca
- `  a4 G% R& t+ n7 R# L  setup-globals# o6 C$ }- i' j" l- f

/ v) W7 Y* L! s5 z" g  ;; First we ask the patches to draw themselves and set up a few variables
) O  }) Z3 H& g+ k# Q  setup-patches8 Y3 T7 c! D# [4 x1 {+ l! c
  make-current one-of intersections! \" @1 @8 ~) E% G( l% u3 s; [
  label-current
* p) x+ }, |8 P  h$ e9 C4 ~# Z3 |) G. m9 E1 J
  set-default-shape turtles "car"
, |5 r3 n8 x$ t  z; K7 Y& @; Q! \) B1 b
  if (num-cars > count roads)
- H$ n* s, X% v8 h/ w( k  [
$ X' {# B0 o1 [8 q# n5 L    user-message (word "There are too many cars for the amount of "
: g2 q; t% I5 b+ u                       "road.  Either increase the amount of roads ", t9 N  c. T2 [, s+ g6 |* K, u4 r
                       "by increasing the GRID-SIZE-X or "3 k( R4 m7 D$ D( g3 j; V
                       "GRID-SIZE-Y sliders, or decrease the "
5 r, l0 Q. [  |+ K& s4 I                       "number of cars by lowering the NUMBER slider.\n"
0 X" D" h8 N1 A7 U                       "The setup has stopped.")
3 |: \" s5 `5 L9 \    stop
& l9 t7 H6 N  @! ~! k  ]
# n: g8 f+ o/ q) i: `$ O, l, \
. D/ M0 P6 C- w! O/ A, a  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; G0 U$ i& g1 F& H+ \' `
  crt num-cars1 R3 }( E1 f9 C/ x( v7 C
  [
- i& U2 B$ V$ r6 a$ J6 j' O! J( y    setup-cars
$ W( n6 g0 v0 q5 ?2 G- b    set-car-color. w! d, n2 Q; r1 D+ W
    record-data
' L4 W' U$ p3 B, m! ^  g$ y  ]
) @, w$ v5 X9 |7 }
4 `' u: K+ r. \% q6 A7 R4 k3 v& w9 ^1 j  ;; give the turtles an initial speed
" k, B2 r  w) |. Y  ask turtles [ set-car-speed ]. ?. }$ F: F2 ~8 Q

5 [" O. e; c6 ^7 c* m) c  reset-ticks% f+ Y' J( H' m& t) X& f. s
end
1 N7 H* F9 ]1 w* d4 J4 M# @
& \4 ~8 P/ I4 g3 T3 ^- }+ N- N;; Initialize the global variables to appropriate values: m  p& y7 u  A: K
to setup-globals
, c  i- s7 y/ c/ p/ K6 N  K  K  set current-light nobody ;; just for now, since there are no lights yet6 m" t/ x; `) L4 z. C
  set phase 0& H; }' F5 H! c
  set num-cars-stopped 01 p9 Q) S; r6 V1 H
  set grid-x-inc world-width / grid-size-x0 c; P: L0 Q% j2 E# \9 l
  set grid-y-inc world-height / grid-size-y
% _3 L# E6 B" _& I
! ?  K. i/ x+ w6 }  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; r7 R. P/ O2 T. r  set acceleration 0.099
( J$ h+ O& ?  D2 |5 ]6 }end
: L0 G* y) f/ x# A- ^5 f& N/ Q, f4 _, B
- [. z  r6 q2 q0 F% ?! w9 X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
3 T: l2 v2 a/ e6 l;; and initialize the traffic lights to one setting' O: N; `* g! s# F9 A
to setup-patches: i9 y) t8 g$ t- q0 B7 m, _* k# p. ~* C5 ~
  ;; initialize the patch-owned variables and color the patches to a base-color9 K. C+ a( l/ Y6 M% S
  ask patches( G9 \; n% T& ?: V! l- ?
  [& N5 ~0 D& w& A9 x( l  F2 A( L+ Y
    set intersection? false
3 _% p$ v/ M$ L    set auto? false4 S  K, v! [- H8 }) [$ y
    set green-light-up? true
3 g1 g- d+ y3 {* o: [- u$ K) V    set my-row -1
( _' A" g. S+ ]% m2 Y    set my-column -1  z( {% s4 W- X1 C
    set my-phase -1
  V* m- n6 P/ T' Z& j& J    set pcolor brown + 30 }0 O8 E* o! I
  ]
( ^8 Q" F, a# a, ]# h" r# F9 z! |' U- x% O2 q" i( z
  ;; initialize the global variables that hold patch agentsets1 Q7 v1 r8 w6 [3 J
  set roads patches with
8 _3 U" l. z9 _# c$ [. S# l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 v# j4 d/ M( `0 P( I1 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  F9 O) g8 l- r: y0 F  set intersections roads with6 N( ]* p% w' ]6 g# I2 G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ q5 _3 {; q2 b* c! t+ F% P! a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; u5 z( H9 @  i! @! {/ S
# G) Z1 J! _5 ?* C, s
  ask roads [ set pcolor white ]( b. f8 @7 |, O4 B
    setup-intersections0 S# U* r. T2 d) [6 {7 x; X
end
0 ]7 j% m! ]3 G+ P' k4 e* A4 x其中定义道路的句子,如下所示,是什么意思啊?; }1 i* D. v9 G9 f
set roads patches with$ D& }; l& d# q0 T, }" u9 s2 H0 d" S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 m! Q+ f# w2 c( j3 U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- N, c$ u' G+ g/ G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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