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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。
2 N) X9 v; N) a6 C" dnetlogo自带的social science--traffic grid这一例子当中,, r- o& i  a% C, W2 z# b
globals5 D4 {9 e  a* h4 R( f5 q
[
% C+ t) g& j& [: @3 I  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 i4 X9 Q- e  P3 N0 B; e2 d7 ]& e  grid-y-inc               ;; the amount of patches in between two roads in the y direction" P6 W$ D0 W1 B" ~! p, R( t
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if3 O4 X; i) E/ x. e( S$ J9 E* q
                           ;; it is to accelerate or decelerate
9 ?0 G. @; A7 T# Y: ~6 W. S8 T  phase                    ;; keeps track of the phase/ l$ Y0 m, d6 f3 }0 N1 _
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure, e4 k) T& A2 @% i" M% i+ O- q* u. L
  current-light            ;; the currently selected light) ~7 O- [: x3 d9 E" w
" h# |) C. N+ o( |$ M2 P6 ?
  ;; patch agentsets0 n& _* i5 A% L2 V2 m/ f
  intersections ;; agentset containing the patches that are intersections/ b4 p* q7 o1 E, W0 B% j
  roads         ;; agentset containing the patches that are roads6 @1 O+ K1 ~: ~" G1 n* @7 M: f
]
0 z( ?) b8 f& f
: A' E' g; ?3 g. ^* \turtles-own
4 ~* B: v; l+ P3 r* O" a" @[8 S$ n+ a8 |, H- @0 ?. l
  speed     ;; the speed of the turtle
! ?9 S/ B% A$ w0 j- ~3 c  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
, z( E0 m% l! }% X5 j1 ~) w: M7 @; t  wait-time ;; the amount of time since the last time a turtle has moved: o1 g8 G' h1 h$ l( D% r4 V) ?6 ?
]7 j# u6 l; V0 q* `
+ \$ {9 K1 R( y; s  K. v
patches-own* S$ u, ?" s3 H6 v% `, n! a
[
* E# N2 [9 A. r6 S; e5 ]6 Q! b  intersection?   ;; true if the patch is at the intersection of two roads* C: @. ?- k3 H4 W# S
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.9 `5 t& B1 n7 T5 H" y. B: d
                  ;; false for a non-intersection patches.
9 `- @5 o4 Z; d. u, o  my-row          ;; the row of the intersection counting from the upper left corner of the. g; u9 ?7 ]' P
                  ;; world.  -1 for non-intersection patches.
$ l) E3 X( n; q$ }) \  my-column       ;; the column of the intersection counting from the upper left corner of the$ p+ G# G' Q3 B7 \& Q
                  ;; world.  -1 for non-intersection patches.6 y  \. Y4 V. L/ S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
6 }0 o6 Q9 d( E  auto?           ;; whether or not this intersection will switch automatically.
9 _  i" l5 E$ S5 j% H! R; U                  ;; false for non-intersection patches.
( P+ P: D7 ]  j6 y3 b5 C]! q! R, ]4 ^7 U  D" @7 a
9 o; i' x  f- V' p/ v, G5 h
4 j( \5 D* J+ D  v2 B
;;;;;;;;;;;;;;;;;;;;;;) t. H* w& c+ k# F/ C1 r
;; Setup Procedures ;;$ W! M* R2 l0 O  p1 U- L& k
;;;;;;;;;;;;;;;;;;;;;;, v) i- @4 O# Y1 y: ^2 X0 Q

  u" ~* O: e) [;; Initialize the display by giving the global and patch variables initial values.' ?, e! v# J0 L% Q6 I% j4 l
;; Create num-cars of turtles if there are enough road patches for one turtle to2 B5 i" k- [3 v( z( g% j
;; be created per road patch. Set up the plots.( q, K2 U' Z, N0 u% }  ]
to setup
4 {; x2 N: c- L. }' j; ~  ca/ [4 x( U3 b! Y$ @1 |2 n4 r% i, H
  setup-globals
% a$ C8 I0 F2 _; d- j) P, k
! I- d. F( `5 A& {$ o  ;; First we ask the patches to draw themselves and set up a few variables0 t( K6 h7 j" r7 L* y& w/ T
  setup-patches
  ]5 p( L& e7 }& R+ i) H" z% X8 E  make-current one-of intersections
) N3 e" \% v* J+ C5 Z6 k& P' Q  w  label-current
9 F2 Q& o: o+ f/ G/ ~' g5 @: Q  W8 _
  set-default-shape turtles "car"; W+ m* g; }& V

3 s  H* M: G% D1 k* d0 G! |  if (num-cars > count roads)4 L" N, u3 ]# C1 _, M
  [
- D  F+ ~( S8 `. {; w" @. \' j    user-message (word "There are too many cars for the amount of "; Z" m, X9 ~8 E
                       "road.  Either increase the amount of roads "# [* ?+ f0 B1 E
                       "by increasing the GRID-SIZE-X or "
6 ?' l9 T1 {; }: N) {& Y                       "GRID-SIZE-Y sliders, or decrease the "( }7 X7 }3 Y! W0 {) j
                       "number of cars by lowering the NUMBER slider.\n"* ~  N2 ~+ |; H  j& C
                       "The setup has stopped.")' P2 U! m# a  {: h: g+ Z
    stop: D( e' n% R8 _2 A0 q& z  O& n; a1 b
  ]
8 @- n: T+ [) R* F6 Q/ j: B/ ]  X' T* F" E# ?) k' W& h
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 R/ x/ Z+ O8 ~7 o, T  crt num-cars
1 Z! T* O2 d) \* x. w/ E  [. P6 V. S/ ]3 }. q  a& h" h
    setup-cars" G7 _, @' b# F# q, d5 O2 Z/ s  l
    set-car-color
. f- }4 J8 o- y: p# D& E$ Q5 j    record-data
- v! j- g/ a0 O, W; T: U- P( r  ]$ K- c6 I$ V4 T: H6 d7 J3 M

4 J' X' x8 h. d8 f7 Z9 p  ;; give the turtles an initial speed
& H* F8 z" s) S" W  ask turtles [ set-car-speed ]
" B6 n/ @# x' H6 |" n/ Y9 j6 ^* r4 l, g4 x
  reset-ticks% v7 T* N5 ~# N$ ~3 R: H
end' f& r: l: v2 u. V8 n7 z$ N. J
' R2 V, y! Z4 r
;; Initialize the global variables to appropriate values7 H' J+ w# I* Z( `7 h
to setup-globals
, P& U$ r% z' I/ k  W9 H9 l  set current-light nobody ;; just for now, since there are no lights yet/ G, `& ^6 c1 H* A" g* }5 ]1 c
  set phase 0& c, F3 S$ Y/ t
  set num-cars-stopped 0
8 \7 T6 o0 P% `9 c8 @# c4 j0 b" u  set grid-x-inc world-width / grid-size-x/ o& \  k% S* b
  set grid-y-inc world-height / grid-size-y
* c" Y7 k4 d# O. M5 r; Z- H4 z6 |) [- {% `' g0 k
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: v8 j1 \" Y' I0 L$ k
  set acceleration 0.099
* c% W7 O* G0 b( i/ G) send& O# D8 K  |- M2 ~! l  k8 `1 Q. l

- ~' m9 w( V2 l1 U) I. k+ X+ v2 G;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: D+ S. A  u  E5 R( R9 O5 ?' B
;; and initialize the traffic lights to one setting+ n/ U8 y6 @. e! j3 D4 l( G6 h" g3 A
to setup-patches. c; c, R; c; F6 @9 ^7 p- w1 {2 r
  ;; initialize the patch-owned variables and color the patches to a base-color
' E" W( @8 r4 }* Z/ j3 _" o( e5 k  ask patches5 h9 Z' P7 @- Q
  [" ?7 v2 C0 k. X3 V% i  Q
    set intersection? false, J  d$ L8 y+ M  ]7 }; T
    set auto? false
9 \3 w! i( l4 |8 ~4 F; k( p. \    set green-light-up? true7 Y) f9 m; ~- g' i7 w% |
    set my-row -1: z, d: l! D% t% R* ]1 S' [/ N2 P9 ]
    set my-column -1
; x8 K7 c0 J$ _; x5 p% V% u$ l    set my-phase -1
; Y0 Y; |4 h* h7 c! x    set pcolor brown + 3: c: y% T3 A+ `) `8 }, F. r3 O
  ]8 \, V: r1 ]3 A

) L$ `2 l) R1 t7 B7 {/ ^" c6 m  ;; initialize the global variables that hold patch agentsets0 U' J" E! [, N6 L$ @
  set roads patches with
% c# {) M1 N9 G2 s/ J" n: t& ?/ s    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# Q& q9 N. t% ~+ \7 Z& U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 N* B  z, g2 \. _  J  set intersections roads with# F8 P  a8 o) p$ m* V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* W2 |/ F/ v4 j0 Q5 @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 }* C# N- c1 r! `; |: q$ W  S% Z; \( B
1 n* a# Z8 U# M5 t5 u: {8 u
  ask roads [ set pcolor white ]
2 i; O3 C0 A- B6 N' U' i    setup-intersections& H" ?; T7 L5 g) w
end
$ Y, `! `2 m& G其中定义道路的句子,如下所示,是什么意思啊?0 ^+ H+ G4 Y( J7 J1 z' A2 s/ |- s4 @
set roads patches with/ w6 n( s+ @( R6 d, Z) t5 B; `
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  E9 y# G% `7 n0 n+ i' n. q; O* H5 Y4 W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 A+ e1 n+ y4 a9 B" v6 I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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