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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: N% n7 z, {1 N
netlogo自带的social science--traffic grid这一例子当中,* D# X# P# O; n+ [' S. i  h  G! r9 S
globals' K9 E; z# B: W
[
+ k; w% G& {2 e" ?1 M" u- T4 u  grid-x-inc               ;; the amount of patches in between two roads in the x direction
' j4 p, P; J" M, x$ a2 z  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ e4 o( U( ~  q1 o6 V& ^6 ]- E
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 [1 s1 O; Y8 I4 l* H0 T( u                           ;; it is to accelerate or decelerate
; D' e# p9 H2 O9 o  phase                    ;; keeps track of the phase. Q2 Z3 u7 U+ e. ~+ P
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
  @' G0 x. Z$ o  current-light            ;; the currently selected light. a2 E0 ~' {$ r: T6 k: t. V# |1 l
9 l# |1 g5 n1 J8 o' Y
  ;; patch agentsets
+ a1 j3 f/ g3 o/ k* P  M  }1 g; w  intersections ;; agentset containing the patches that are intersections
; f* f2 o' r0 Z  roads         ;; agentset containing the patches that are roads
/ O4 O3 e* ^; X1 V3 _. F" f]8 Q8 _1 |: b3 \- g" j

; ^8 i3 p: u( P% V9 gturtles-own
+ D, B- f1 @  S6 g! E7 f! @[
* [9 {; V9 G- b: T3 s' i+ f  speed     ;; the speed of the turtle
& B" _5 ?: a& x  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
) E3 I6 Q$ U4 X0 ^# @1 V3 I  wait-time ;; the amount of time since the last time a turtle has moved  i* \# d* a2 J& k
]
, n  j# h: W# e, ?* O. B0 }' U' Y; c# d0 l
patches-own( U- x$ z& C( B/ R
[# |7 A* r3 m8 D/ Y8 A
  intersection?   ;; true if the patch is at the intersection of two roads
3 W2 @0 q! s& ]) @+ D  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. `' \( c  ]+ u  P7 m# _                  ;; false for a non-intersection patches.& w* e' r/ J0 f% ?$ `* i
  my-row          ;; the row of the intersection counting from the upper left corner of the& N0 h' G3 ]' w) Q+ m. H3 _7 A
                  ;; world.  -1 for non-intersection patches.
/ A5 l+ l; c$ c/ t+ w6 \  my-column       ;; the column of the intersection counting from the upper left corner of the
+ i* q. k+ v& f7 I& u                  ;; world.  -1 for non-intersection patches.
# b! j% N& o2 r  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
  G+ z( Q: L% k& n3 N8 L  auto?           ;; whether or not this intersection will switch automatically.
! b$ C, I4 e# K+ W                  ;; false for non-intersection patches.( K( m* @& L$ W8 c6 A1 ]; R& R
]! o: g( f' n5 h" I4 w9 ]/ e

2 |' D; v; Y  k" q! m1 A# a- p( s8 Q) `5 m  n# s9 G
;;;;;;;;;;;;;;;;;;;;;;
( O# L3 `4 ^7 N3 @7 T  q4 ^, `! c;; Setup Procedures ;;
$ i9 s! N+ R5 }" `9 J' j1 q;;;;;;;;;;;;;;;;;;;;;;5 R( S% H/ v" e6 r5 m

0 U4 {2 }2 A- ]( V;; Initialize the display by giving the global and patch variables initial values.2 g3 g. B( U! Q* h! _0 M
;; Create num-cars of turtles if there are enough road patches for one turtle to
8 d7 m$ @# H+ z' G, z- ?. B# K;; be created per road patch. Set up the plots.2 }& R2 q1 J. I
to setup
; R% O- [' C: t# H* d9 \  ca
  l; \$ R- T5 v9 R9 f- ^  setup-globals
1 f; Z3 v1 |: g% R  i. [% e: f% I" v: F
  ;; First we ask the patches to draw themselves and set up a few variables# O, `& H" z2 X" Z
  setup-patches+ U$ w' W$ Z5 ]( Y4 ~0 H! E- B
  make-current one-of intersections
; ?6 _6 L7 ]) |" B* L7 ?8 B  label-current" {# O" X" W+ o! p0 q7 F

  Y: n" W. N- u7 Z# b' B- I  set-default-shape turtles "car"
/ t  D0 J+ V9 v2 M) J. W; c& Z7 ?1 e+ X& p) @4 [
  if (num-cars > count roads)6 [1 T- O6 M8 U# ~9 N( ]5 u- ~
  [
0 a/ C7 M4 ]# s7 p    user-message (word "There are too many cars for the amount of "
9 `1 E# _+ Y7 U                       "road.  Either increase the amount of roads "
4 j8 B, i6 l0 Y+ v                       "by increasing the GRID-SIZE-X or "
9 q" v  s& e2 N1 c3 R0 S3 {                       "GRID-SIZE-Y sliders, or decrease the ". Q2 ~1 T8 S+ s
                       "number of cars by lowering the NUMBER slider.\n"; ^$ p/ U; h6 S) b! D$ A
                       "The setup has stopped.")
5 ]7 q% N0 t: p6 N    stop8 S4 F2 {! K9 s1 ?
  ]9 U& M8 A$ s; i  t, u: W
0 a% S  W3 }: c1 a& B
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ W' A2 X; v: q; v  O1 L  crt num-cars
; q5 `/ Y+ O" b% D+ K# z  [/ a# w( c/ ~2 I$ |; t
    setup-cars
' D. y. C* g. T" z1 i. B& J    set-car-color4 j% D4 N7 H; {( k/ T% M0 u
    record-data  U( t; J# v  q  T
  ]) A1 ~. ~3 O% ]! `8 G% c
) y2 V7 `1 v( T( |. }! J+ B
  ;; give the turtles an initial speed8 h: q% X' I2 ~
  ask turtles [ set-car-speed ]
6 A: i" x" y! U, _3 `  N7 L, T' `9 n4 \$ i& J6 u) r3 s
  reset-ticks
; v. @3 j. C, q" C" F4 x% v/ [5 ]end+ i( ~/ f  `  O9 n' O
. R7 c& l! c- N9 u* u
;; Initialize the global variables to appropriate values9 L& a" S* E8 u+ U- P
to setup-globals
6 k, @- Z& M( S9 ]: b  set current-light nobody ;; just for now, since there are no lights yet
. y$ ?5 K$ S  K, U  set phase 0
5 H$ }2 u, z0 [# J: L0 H  set num-cars-stopped 0
! [; D! ~5 i' [  set grid-x-inc world-width / grid-size-x! U: U/ }* ~( J! {( v
  set grid-y-inc world-height / grid-size-y0 _5 l( {/ E! U* e% Q. g
; f2 \) X9 |2 r' Y  i" Q, `% F
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ A7 y7 o) E& C( K  set acceleration 0.099" b$ u5 V5 A+ E
end
5 K0 i5 t! C% |( r' X
# R  A( F7 k) B: G$ A* l* Q# O8 v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' [/ _6 Z3 s7 A;; and initialize the traffic lights to one setting
% L. W8 S) L& C8 a$ C& _, @; Wto setup-patches+ @1 O- w3 Z; @7 M" T; A
  ;; initialize the patch-owned variables and color the patches to a base-color
; R- W( G( U+ ^% L' Z  ask patches
2 A( i! M8 s! y. y3 p  [0 J: }( g* V% C# I' k! }6 r6 i
    set intersection? false
! V4 A, B: g" u6 N/ Q" Y% K5 t7 X/ d    set auto? false& H6 P/ {: {  ?+ U4 M2 D  M: B6 C
    set green-light-up? true
- G6 Y6 K& T8 p; e- ]    set my-row -1( }, q' E6 X: j0 z
    set my-column -1# W& R  S+ [8 E+ g
    set my-phase -1
1 B! I, f/ L: N- U: @    set pcolor brown + 3
% p: r" ?5 @+ f' f# s& k  ]
* i3 d& W$ q" H& w" ?; h  l; M7 U" G! d
  ;; initialize the global variables that hold patch agentsets
& [3 s1 f( x$ O- `: [  set roads patches with$ @8 w# n+ y; K+ b1 M% k
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; z2 W4 g4 K5 R& a: |; E2 ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" g$ M  l) a7 t" O+ T6 z  set intersections roads with
. r9 t+ c+ z- j, }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- A' R1 y/ e( O1 s: r- x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 }. x" u7 ^/ a7 v9 R: e2 C1 v& G4 q- N9 l9 k& W; v+ D' O9 _' m
  ask roads [ set pcolor white ]
2 K1 U; U; u# P* p2 F2 n    setup-intersections
: [( @1 }& \( ^$ L1 P1 wend
! ], B* ~, v5 ~# q2 M其中定义道路的句子,如下所示,是什么意思啊?
7 a* Q" P: Q" l! }1 c3 P set roads patches with
7 ~0 Z8 A$ ~* k8 Q' W8 R7 F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- v1 c: g+ ^& y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 R: z8 R8 s7 _7 ]6 A
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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