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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。9 D/ `: L, \. l: g
netlogo自带的social science--traffic grid这一例子当中,5 v: b  X% C% S3 Q
globals- D6 r1 G: n0 Z* b1 W/ C2 @9 m
[, \$ O" Q7 J, w/ x- [- w% y
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
' B: Y5 ^$ F7 t+ e0 z4 H: D  grid-y-inc               ;; the amount of patches in between two roads in the y direction
* _8 e$ Y0 \2 p' w. H  X  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
- u1 r. I0 @! o0 d$ e1 H9 M; l0 ]                           ;; it is to accelerate or decelerate
" j9 Z( L+ _$ C0 K3 t8 k  phase                    ;; keeps track of the phase1 E. q+ ~) O$ q0 v4 Y: c
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure3 N& b8 I. H- \0 J' @
  current-light            ;; the currently selected light# C+ c% \4 i/ z" J$ \0 G! j
1 `/ q: t3 d3 `/ M5 X6 n
  ;; patch agentsets
/ E$ r# h; ?8 t& `1 }9 o# B  intersections ;; agentset containing the patches that are intersections0 R+ ]5 m1 _* ?: ^
  roads         ;; agentset containing the patches that are roads
: @+ `0 F7 A/ @: c$ [5 q]% a& b# E* P- ^. b+ `

1 X! t* j1 n4 E/ ~& Qturtles-own
, O' z6 R- Q$ z3 V[5 }' u" L6 s$ @
  speed     ;; the speed of the turtle1 a  c  P; W# h' T' a. I
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
5 r$ `, Q6 D' n3 v% t+ m  wait-time ;; the amount of time since the last time a turtle has moved" {) a2 v6 O4 P- o2 l
]
9 j' J) [- X8 _: \2 W0 ?2 H. X+ o7 A. z
patches-own, i9 {& M4 j' _: @# z( ^
[9 f3 g- Q; F. W6 W2 `# T/ S0 F2 w
  intersection?   ;; true if the patch is at the intersection of two roads1 M, i+ Q& X! c& W7 g: V( B) D
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 l$ @' e+ H. D4 [) N2 `                  ;; false for a non-intersection patches.  A, A2 y$ n% [7 ]8 y
  my-row          ;; the row of the intersection counting from the upper left corner of the* h) D' a* F# e4 s1 |& f
                  ;; world.  -1 for non-intersection patches.
; I- ]2 t+ D, R+ M  my-column       ;; the column of the intersection counting from the upper left corner of the/ k. c! x5 e. q3 @" M# B! @- H
                  ;; world.  -1 for non-intersection patches.
+ z) E) c3 |5 K, T; q& V  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
* l- v/ m# c% k$ \$ M  auto?           ;; whether or not this intersection will switch automatically.
" Q5 C: x) R( @* ?                  ;; false for non-intersection patches.
8 |6 \0 z* I9 n/ ]0 x# |]
: ]4 @9 l, P$ P" \; M2 Q# e
* ]5 b6 ~6 `: a: @7 ?5 @" l& Z$ i
2 R  J% x2 m/ T* b$ T;;;;;;;;;;;;;;;;;;;;;;" `' |0 |! T. Z0 R# }: A
;; Setup Procedures ;;: G2 _  ^8 O. G& Q0 |# [
;;;;;;;;;;;;;;;;;;;;;;! M( q& v' M2 E, E, U1 E

. @4 h, ]3 n0 j* X% `& e8 e7 r;; Initialize the display by giving the global and patch variables initial values.' V, A) l8 J$ Y! p3 s) c
;; Create num-cars of turtles if there are enough road patches for one turtle to2 k/ V$ U/ R6 h' B+ B! Q4 n, @$ l, ^" E5 Z
;; be created per road patch. Set up the plots.- L6 R# a- p1 U5 H
to setup
, S) N* P8 \8 [* B! p, A  ca7 r9 L) [9 G: }/ }+ s" P7 P7 A7 P
  setup-globals
) O; Y4 \! c* ~% M# @9 c7 S" h/ x6 T! U' {
  ;; First we ask the patches to draw themselves and set up a few variables, c3 B% }7 J9 d. p; e
  setup-patches! A- {  W( `8 ?! n8 Y* s. C. w/ p
  make-current one-of intersections  k7 A1 R. ?3 H1 b) D
  label-current7 d7 x. \% D% z. \" e9 Q! s- p6 _
; {3 X' ]0 B9 S+ U
  set-default-shape turtles "car"
1 u4 l) a* L+ A' C8 g8 ]% T" h7 i+ s: S  w
  if (num-cars > count roads)
& o4 W0 G* ?$ [6 n& Z  [
0 h: P* u4 m! }* d    user-message (word "There are too many cars for the amount of "$ O6 R1 @" V) w. V  i
                       "road.  Either increase the amount of roads "" ?3 D& I/ G. H* O* e( W, v
                       "by increasing the GRID-SIZE-X or "- e& j2 ~9 h& u: N
                       "GRID-SIZE-Y sliders, or decrease the "
* N' f; r! n1 t; h5 \                       "number of cars by lowering the NUMBER slider.\n"
  _# \' U9 b+ Q; g) q) t3 ~: v4 _                       "The setup has stopped.")
/ `' t/ ?- G0 z$ o& B    stop+ Z2 i. g( a' k+ U% C3 ]
  ]7 S8 P0 J4 W, y/ t; K8 ~0 J
0 a" Q  m+ [* ~* a$ L& x* l& B
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ w) w$ S, P7 w+ z9 n  crt num-cars! l9 f; v, Q, }* q9 W# ?, F7 E6 |
  [' n) P4 ^: z4 Y5 g
    setup-cars. i4 X( \3 i" J
    set-car-color3 X6 @) [6 ?+ O" q
    record-data
! F9 _! @: C# P7 E5 @  ]' N: E8 _5 b+ _
6 O7 w+ x$ [; {
  ;; give the turtles an initial speed# Y1 V! i3 s% U$ z
  ask turtles [ set-car-speed ]: v3 x* e: o% i4 u' a, }  e
/ x2 F/ n/ }8 J0 B+ @2 ^; r
  reset-ticks
. y( T9 I" ~4 Wend4 m5 S; E7 ~" h# Z" [' i
; l/ ?  s, q3 [' c: y  [
;; Initialize the global variables to appropriate values4 p3 c* G  d9 H1 [$ g
to setup-globals
$ F* x2 [# t/ ?4 n3 ~! G  set current-light nobody ;; just for now, since there are no lights yet6 R1 p/ m9 T! H" g* K+ v5 M* c" T) P" {
  set phase 0: Z% j. R( i1 {2 h! T- S1 o* D
  set num-cars-stopped 0
/ h, M, K8 \9 C. I  set grid-x-inc world-width / grid-size-x! h' X2 ~$ ]7 j6 r4 s2 I- x
  set grid-y-inc world-height / grid-size-y
% K5 H% l6 z6 K- ?! h: Z- j$ _
) o% i6 s- r3 D- g0 ~( S  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& f( _6 z& k( c; M
  set acceleration 0.099
" r! f0 D: e5 @) B1 Pend
- F5 l7 c2 _1 D/ t6 g0 e( T: A# P( C" J" E$ S
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- |7 V3 a+ _1 F$ f/ U;; and initialize the traffic lights to one setting! W) p8 E/ D3 Q' M1 c' {7 k
to setup-patches0 r6 q0 q: j% L$ v5 Q
  ;; initialize the patch-owned variables and color the patches to a base-color! @# g+ c4 ]/ |$ w
  ask patches0 _/ ]: I. m: ~/ n- A& a, u/ G
  [: N; e- H& O+ L4 @
    set intersection? false
3 P8 o: ^+ T, c    set auto? false
' x5 B% R* M5 h) Q( [: X. }    set green-light-up? true6 i( D# _, }7 c' ^2 ?
    set my-row -1
5 @! W2 n& c5 S    set my-column -1
6 ]; @1 D* L  ?    set my-phase -1
8 p5 }% Z1 ]" x: J! `8 o    set pcolor brown + 3+ P, X; y! S% @8 B: I$ w* v2 v
  ]
6 D: h) z+ U' l
8 o( Q1 Y3 ?* e- n; \) n/ U  ;; initialize the global variables that hold patch agentsets- I$ Q$ I; X! |
  set roads patches with
+ y3 s; Q7 ]2 c/ S0 m4 f5 h# k    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 x! a# W2 e( c# O    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% w' N" \+ P( W0 @; Z
  set intersections roads with$ ~/ m3 m% |% y( P( i2 j) Y! R! X% v. i0 B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! l' K3 i2 L3 @, e( @+ O# n" D7 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 }2 k, A3 V# ^4 ^
2 O1 c  J0 q" y0 C: \3 E7 `  ask roads [ set pcolor white ]$ P2 w1 m/ i9 n& {: {
    setup-intersections) N. M' H* f  _
end  N% Y& |" R" g# X9 ?( \3 L% v4 E
其中定义道路的句子,如下所示,是什么意思啊?) X( Y5 P. L  |1 U' [5 X( b
set roads patches with6 L0 {: g8 `4 j4 z- G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' \/ x! h1 L+ c& c( e" U! F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( B0 ?4 ^0 I6 f
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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