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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。
% \" n# P4 v% n; v6 Onetlogo自带的social science--traffic grid这一例子当中,
8 j! ~, U( @: w0 q" r, Xglobals
, Y: \5 x' K# I6 y5 q[; Q; G) \1 M2 {0 m7 `- ^
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
& j! S* G1 H# ]' `1 a3 x' J  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ o1 |1 C# g" ^6 P
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ L4 T7 B3 S7 W
                           ;; it is to accelerate or decelerate- {. a# L0 i* o' B3 P( c
  phase                    ;; keeps track of the phase
! \; b& q' z# \8 A) H  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure, c. r* z4 F' V9 M- B9 b0 H+ j
  current-light            ;; the currently selected light: b1 B) W: O& Q2 `" U
8 j: d( s* _* c- g; V1 g
  ;; patch agentsets& B3 t" r& ]: R6 R. l5 ~1 ^
  intersections ;; agentset containing the patches that are intersections) C/ [6 z1 v9 y) V  [9 y: G% \  B. t
  roads         ;; agentset containing the patches that are roads% Q9 q; b8 `# ?4 c% ~/ w( c/ u
]  ^2 I4 I. n# C/ c+ C( V/ a! ]

8 G! {1 }# I2 j2 u* P9 }1 L- tturtles-own
0 y% d0 F9 k& D* u5 u+ |[" ^, d; h: v+ [& g- R
  speed     ;; the speed of the turtle
% `" V. X1 h# ?+ r6 ~/ L  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 V, }4 W9 h1 P3 P2 S8 f, W  wait-time ;; the amount of time since the last time a turtle has moved% h( g) \( c6 R# X' Q' g- G9 P$ L
]
& Z4 Q  n( O" H8 b& g
9 O+ M+ W6 H5 j: d, G9 tpatches-own
9 ?. N/ K2 [- A6 C[6 @2 `/ M) t# j9 r, W0 {, r
  intersection?   ;; true if the patch is at the intersection of two roads* O( M* L0 J' I6 I# D
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.) e% J4 ~6 b/ `- R; w: m/ A
                  ;; false for a non-intersection patches." ~) h; g( H3 B
  my-row          ;; the row of the intersection counting from the upper left corner of the
. `. M% `9 P% r9 I3 A1 E- s                  ;; world.  -1 for non-intersection patches.( a& \. a1 d* }& L5 n' ~; q/ ?
  my-column       ;; the column of the intersection counting from the upper left corner of the: ^( N) _5 L- ~* X3 q- c2 I
                  ;; world.  -1 for non-intersection patches.$ h7 I+ D/ u: N/ d7 g  z- @2 X
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.. B. }9 G& {9 |( Q  w
  auto?           ;; whether or not this intersection will switch automatically.& k/ r, T& [$ k" ~  a
                  ;; false for non-intersection patches.
1 D' J! n' A. ]]
+ g" X2 G# q9 ?; {! V3 s0 h, F
# Q% H: O. f+ e1 B/ K) `( W
% l3 c0 t. m$ z4 s4 n4 ]/ M;;;;;;;;;;;;;;;;;;;;;;# {( C' i  F+ C
;; Setup Procedures ;;3 \9 A, {- P5 d. x
;;;;;;;;;;;;;;;;;;;;;;2 e' M; T% N0 I8 {: m6 i" P5 m) X
8 g2 Y8 e  v  j, p1 G
;; Initialize the display by giving the global and patch variables initial values.
% w5 @9 ^1 b4 [- b; r;; Create num-cars of turtles if there are enough road patches for one turtle to  S! _3 q# w0 I. s1 E' l4 f' O
;; be created per road patch. Set up the plots.
. i$ U9 L8 h+ C  u( L& @to setup
- f6 J# F6 K- E+ q& J' q  ca  H: c" c& v0 K+ ]! A  l9 l9 I
  setup-globals
1 c% |" _3 O* h3 ?3 I6 H/ g" o3 ^1 s3 C
  ;; First we ask the patches to draw themselves and set up a few variables3 ^; v! A3 s7 }0 e5 }) f1 G
  setup-patches$ d. H5 q" }2 @6 |! b! R2 |+ L% G
  make-current one-of intersections  v: y2 X+ n0 A8 Z: \
  label-current
$ I2 t$ B" @  C; a7 ?! e! A
/ c0 _& g* h3 e1 o* j/ i7 q( A  set-default-shape turtles "car"
% `/ _) H, J2 i6 o
& Z+ H7 x6 C$ P; H8 ^- H  if (num-cars > count roads)4 D% m0 j- _" {8 M
  [' w9 Z- i& B0 Y7 E! J" f
    user-message (word "There are too many cars for the amount of "8 m4 }4 o8 Z% W: q1 ?& |
                       "road.  Either increase the amount of roads "
# ?9 s8 f& x* m5 z9 o% ]                       "by increasing the GRID-SIZE-X or "
& U5 [& u" t5 j$ p# T2 `3 x                       "GRID-SIZE-Y sliders, or decrease the "
- o* `# l# R+ \3 |. ]  l- w- i5 g                       "number of cars by lowering the NUMBER slider.\n"& k" m6 I4 i1 t/ e. z1 \/ r" v
                       "The setup has stopped.")1 \5 V- A8 U) T% H2 X: z3 M$ F5 H
    stop
, u' e5 U0 C7 N7 U9 `& z4 S  ]+ }& ], ^0 _# t: ~
8 N8 `3 e% K+ b( ?0 _: H; w8 P
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# x  m& |3 ]- U. k  crt num-cars7 t- z) H1 y0 p
  [. {' d& W+ ~9 g1 V2 ]8 [! Z5 O4 q
    setup-cars
& _/ u* M( q$ w9 v% t  R    set-car-color- U% o9 G0 X7 S# q, r
    record-data/ y/ L7 ?0 w1 Z9 f. s2 ^: ?
  ]$ i2 S. A1 K1 v8 n" h0 t! B  y
1 @% V. H# \- }
  ;; give the turtles an initial speed6 r4 s9 f! t5 r& u4 u( t
  ask turtles [ set-car-speed ], ?4 B1 h+ K2 T) o
. f; c; a% A' u4 o0 T- i( i, V
  reset-ticks
( o, N; N+ {7 A0 o- ~end
; y9 h- z! V+ ^3 w. W& X! w& f" S2 V, T4 n- Q$ _
;; Initialize the global variables to appropriate values/ B' N2 I5 \$ P
to setup-globals) K( [# G# h' ~
  set current-light nobody ;; just for now, since there are no lights yet
) M3 k% k# u; t& c& a: f  set phase 0+ F  U% _% t# w
  set num-cars-stopped 09 P3 B) Q9 r# ]2 }% F* H: Z/ n
  set grid-x-inc world-width / grid-size-x
. k4 {8 ?3 e" y* K4 J  set grid-y-inc world-height / grid-size-y
$ u: T( ]% ?9 H% B: @/ l, y2 a3 v
; D/ _" B2 b+ R* |& O+ Z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, H& L2 V( ^/ m( m" e
  set acceleration 0.0996 l2 E" ~) _5 t: x
end
# O' M6 a9 F; o; {
+ y! p' e. s4 c5 p, |0 i;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. z+ Y$ H2 t  @! P0 L; B( p
;; and initialize the traffic lights to one setting
5 O# t: ], M2 x* X0 bto setup-patches' \) I( Z1 H0 d! ?7 @9 O6 G5 N1 A9 x
  ;; initialize the patch-owned variables and color the patches to a base-color  j, ^8 k; h+ @3 z
  ask patches
! N8 d) j3 D8 Y& r* n  [
! n" m5 x6 T" ~' @& C    set intersection? false
1 `: ]$ _, }9 I    set auto? false
# K( `( s+ D1 v1 ]8 S/ M0 w' w    set green-light-up? true
. [/ [0 c3 T1 q! l) l1 K    set my-row -1
( [( Q  w; K- P- }  }, m    set my-column -15 C* D/ _4 L, G9 O& ?
    set my-phase -1
# ^! E) B% a) l4 u& a    set pcolor brown + 3) H5 k! r9 [+ I1 C- j
  ]
# I* l( X. [9 X! }
5 w- Z- f5 I# N  p  ;; initialize the global variables that hold patch agentsets
7 t# o5 j4 q! x: B1 x, s  set roads patches with
+ R7 Q1 b: i  E/ ]: Q% W    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" }" |0 j+ [9 ?3 R) P% G' [6 y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 R  q& f& s7 d  set intersections roads with, U/ X. ]) M) j7 d+ @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 H. _2 s: Y8 ?! F" o# }/ [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 i( r; v% `2 A' F7 M/ v
( V3 Y0 k( B: Z  ask roads [ set pcolor white ]8 {% }$ _; k1 q5 ^! j# s5 Q" G
    setup-intersections' v  R8 w& |& [; q! s7 m
end
6 i4 B  r# P4 ]0 z6 c: ?7 w其中定义道路的句子,如下所示,是什么意思啊?9 |; I5 ]  f# N2 U. h
set roads patches with& i; o! {5 n( Y; R& ?) o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 a- G0 X6 n: U
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: e6 ^$ x$ E; l# R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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