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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# H& W- l5 p  M4 r# gnetlogo自带的social science--traffic grid这一例子当中,
) J* t9 ]# z3 c, gglobals
8 }' c( X8 x6 U$ e[7 v/ q" e. X8 n( G; _5 S) K  t
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
: G) e) A% o1 Q5 ?" t6 _2 A  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! a1 Z" T5 B3 j7 Z; R5 u  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 ^0 e8 [  o7 _& M/ c( g6 C) Y" m* t
                           ;; it is to accelerate or decelerate9 ~2 K8 R6 w0 b
  phase                    ;; keeps track of the phase" d; u6 ~- _; Y9 }2 y2 @" z# s
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ j' T6 ]( k& {0 A0 _( c8 o
  current-light            ;; the currently selected light; i; l. q3 H6 c8 Z+ y  ]

" @7 B# U: E# l& o1 ]  ;; patch agentsets
) x- C; k( C/ ^  A  intersections ;; agentset containing the patches that are intersections! H  j2 p# H" f7 p: Y7 Q% r/ v2 `
  roads         ;; agentset containing the patches that are roads
1 X! y; e% c: }5 j! C]0 r+ S- p7 `$ Q( |/ L- K

+ P% w8 F, d9 zturtles-own" ~# j- V0 h0 X7 k2 S3 |3 P8 T% R+ R! h
[+ c6 j# O$ m) C6 j& {
  speed     ;; the speed of the turtle
" B3 ~6 ^: F# H- ]! b  up-car?   ;; true if the turtle moves downwards and false if it moves to the right& Y( n" P7 R3 `9 R1 M: k' D
  wait-time ;; the amount of time since the last time a turtle has moved4 d- z* m* X$ d- G2 ^- G
]1 K3 d. f3 w6 P, _) M

' X2 f/ H$ v  m) \7 spatches-own
1 s6 \0 [3 J( D[$ M+ y" p9 }  V# w
  intersection?   ;; true if the patch is at the intersection of two roads
. y. y3 ]* B1 y4 J. P  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' M5 q: @+ I8 B" ~' \
                  ;; false for a non-intersection patches.! W- j( Q1 _5 p- z: R
  my-row          ;; the row of the intersection counting from the upper left corner of the$ F; f* i1 K2 A# I
                  ;; world.  -1 for non-intersection patches.' H% E4 @3 h. U/ v" v
  my-column       ;; the column of the intersection counting from the upper left corner of the* W+ ~: X; ~1 M) `. Y: X% D0 S  t
                  ;; world.  -1 for non-intersection patches.1 t& ]; D/ y7 O
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.6 Q$ g; S7 t9 r. w
  auto?           ;; whether or not this intersection will switch automatically.4 k3 ~  u% I: I: M$ G7 C
                  ;; false for non-intersection patches.3 J$ ~& V% ^" _# A) H
]
( v% c7 x! |! J- ?1 H1 N9 x- [" L) z1 @0 n1 p! v

5 Z& v- `* {" k7 e, a;;;;;;;;;;;;;;;;;;;;;;8 A0 f: h% X+ j. `7 ?" i+ H
;; Setup Procedures ;;' R" p. J1 y5 Y
;;;;;;;;;;;;;;;;;;;;;;
4 \  \4 W6 k  `( u0 p* P% p  z: X, o  f3 G! t
;; Initialize the display by giving the global and patch variables initial values.
4 Q( x  ^/ V/ X;; Create num-cars of turtles if there are enough road patches for one turtle to- [) _6 y* \# O: ~( J
;; be created per road patch. Set up the plots.
- a* @. u: s' V0 h* Yto setup9 w; I9 u# S1 o$ h: L
  ca' }( N" e8 _- A* B3 c9 \
  setup-globals
, T) N0 j/ L! G( D
/ q/ k4 k8 }/ F, @  ;; First we ask the patches to draw themselves and set up a few variables
, S( {+ x. b; h/ K2 \( D  setup-patches
& J' }' M* i% N/ n9 s: Z+ N  make-current one-of intersections
& I  r8 V6 u4 K% f  label-current- ]! c' w1 J6 h5 ?
% b; O1 i# t1 f
  set-default-shape turtles "car"
! |: `) e& }! Y) t" N/ O2 n( l) {- Q
  if (num-cars > count roads)5 I8 @$ h$ k! B
  [
, R; Y$ d) }3 Y/ N2 b% T8 F    user-message (word "There are too many cars for the amount of "3 h/ I3 z0 d3 b6 ~" I7 M
                       "road.  Either increase the amount of roads "7 z  V4 t% i) J/ `; z/ ~
                       "by increasing the GRID-SIZE-X or "
+ D( Q* e( S# A3 w7 }& ]0 E+ C                       "GRID-SIZE-Y sliders, or decrease the "
- Y. ~3 D0 h% x5 f5 ~/ ~                       "number of cars by lowering the NUMBER slider.\n"
/ P9 L: r3 W, }5 o. o) I                       "The setup has stopped.")6 t/ u6 w% m/ j2 J' V. i5 d
    stop
; a+ B2 \( M  J, P' A& A6 D  ]) A2 Q/ Q6 C- @# G1 x
+ b- f; i! ~. @0 X
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 c6 r6 i% P6 R0 x- y  crt num-cars, k& M* \  }7 d
  [4 ]( L: [- }$ t
    setup-cars2 g4 b. c  U( j/ ]. m% d
    set-car-color! A& v9 X6 V( `1 b% T
    record-data
- T1 j9 t& K8 S! s% C% d- ?  ]  Y/ O. r) `/ B" r. N& H$ z8 \( @

" D/ {) A7 r9 M+ V  ;; give the turtles an initial speed5 t2 i5 q- P# b1 v: i5 x
  ask turtles [ set-car-speed ]
' O: R& a' V% K* J
% d: T4 @$ k$ A. O; s$ d+ h1 K  reset-ticks2 p9 }# Q! Y/ k2 Z  j
end/ {( v- W% \3 X
; N: \9 l4 I$ E9 S
;; Initialize the global variables to appropriate values) `  q4 J0 M7 p- v, s
to setup-globals) y- C- ^$ E. N8 E* E% Q6 C1 l8 w
  set current-light nobody ;; just for now, since there are no lights yet# p: T; W. r1 u/ ]
  set phase 0
; ^' [$ T* l4 y  H  set num-cars-stopped 0
" H  L3 L; f6 v. J# {6 h' E  set grid-x-inc world-width / grid-size-x4 y5 L, x7 A( P$ P. X5 t+ J2 m# f
  set grid-y-inc world-height / grid-size-y
  U& ^( x* i  N: ~, l6 e  D  f( U
' K* i* c2 a% e) a$ _( h# m  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 ^' c; V& F4 M
  set acceleration 0.099
6 P  z9 y4 s7 E1 C  Eend
! z) W( l2 R8 K8 K6 L( j7 K$ i6 ]. R/ J+ `3 E+ b
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; N8 `8 e. U3 _: q$ P8 Y3 C6 w
;; and initialize the traffic lights to one setting/ f% e: q, k; y; w8 a% N/ d1 f
to setup-patches+ B: h6 K5 I* W# {; l' O3 ]
  ;; initialize the patch-owned variables and color the patches to a base-color, z/ x9 U4 ]# K& Z( O
  ask patches
- }8 ?5 n  Q0 a( I! ]3 x3 f  [
3 c) ^$ x7 }8 \6 O. z4 Y" N9 p- {    set intersection? false7 M( c0 M: w6 O4 H
    set auto? false* f0 |  J- ?+ b2 N- k) F) s9 P2 }
    set green-light-up? true
2 B2 P3 V" r: g0 e8 ]) v/ {    set my-row -1
2 Q4 N7 ~) m3 c$ ]# ~    set my-column -1
; U- T3 ~1 `& I/ Y* e    set my-phase -10 ?2 E" C* [& F# }
    set pcolor brown + 3
. @1 m' K/ H1 Y* Y0 H/ p% Z7 V, g  ]
9 T  o; }0 z6 Q! `9 b4 W5 k9 C& x- ^8 m2 m
  ;; initialize the global variables that hold patch agentsets
0 ^3 a$ `8 u. \6 C" z* W4 Y; p  set roads patches with
& Z5 n' _. D" G4 V& x    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  }! _& U. ^4 G; p) v1 V( `    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; U! N& ^0 \* F1 C  set intersections roads with+ [3 S& A! Q2 Z" d" H- _& }
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
  y+ W$ J0 c5 ^6 x$ @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# b+ f+ T/ \# ?( Y# M
/ U' f" K& W% |( L
  ask roads [ set pcolor white ]5 }5 k+ K+ j8 b
    setup-intersections: }  }4 o# H' u3 g; E
end# |2 t2 O. e& a& ?7 `$ z4 x8 E/ Y$ a
其中定义道路的句子,如下所示,是什么意思啊?
4 [# G- l2 g0 u, U, M0 s+ A set roads patches with. u% q! o9 B% g: T. Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( m/ k+ Q3 y: k1 w2 `; ?' ~) V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; }) f/ [; V4 M) j6 o$ U3 h
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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