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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。: ~, r  e. [" X1 Y) N
netlogo自带的social science--traffic grid这一例子当中,
7 g, B& s) W+ R9 wglobals: v6 Q/ D% q3 D; s
[
! @& `0 d" K$ A, [- V3 ^0 ^% ~) C4 ^  grid-x-inc               ;; the amount of patches in between two roads in the x direction! ?* C$ Z( I- P3 j  H
  grid-y-inc               ;; the amount of patches in between two roads in the y direction* }+ @3 ~# N% i* X  M3 d- m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% n. H- S( L* v' z) w/ P3 ]5 S; K) b                           ;; it is to accelerate or decelerate5 w/ i/ A1 V: |+ J4 z
  phase                    ;; keeps track of the phase' U7 ?- `4 X0 s9 O' ?2 y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
; C7 @# ]% ~! u" S, B6 w" d- d& M  current-light            ;; the currently selected light( L4 `' U7 Y8 [# [2 Q
+ L' Y/ o" ~5 x, m$ y  A# A3 d9 q
  ;; patch agentsets2 X: d9 J7 }: C! ^
  intersections ;; agentset containing the patches that are intersections
& L+ i2 D2 z8 Y# D5 x. ]2 A  roads         ;; agentset containing the patches that are roads
- W( k' Z5 l. ]% N) U& f]
/ Z$ H' R2 z7 z% L* [) ^
+ N8 g0 d) N3 Q3 n6 L5 O* mturtles-own$ o3 V' A# A+ L2 \; N( J  N
[3 ^( ]: q; E8 @) e; p8 V0 [7 N4 m
  speed     ;; the speed of the turtle
8 v) r  C) W" k  up-car?   ;; true if the turtle moves downwards and false if it moves to the right8 _5 B: X" }% ?0 M; w* ]5 e
  wait-time ;; the amount of time since the last time a turtle has moved+ K: q* I' T+ `1 c5 D: r
]/ l- w- h5 A% y3 J/ m+ O' f: V9 X
- z  l/ f. ?' W. B" n4 B
patches-own
$ }2 ^- y: |) f$ E[1 Q& Q- |& ?" V2 p1 Y* ]
  intersection?   ;; true if the patch is at the intersection of two roads
0 i. F) k2 ]; W& S  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
- l9 d3 O" U6 e+ _; F6 U                  ;; false for a non-intersection patches.5 {- E# @: n9 d: _; o) M
  my-row          ;; the row of the intersection counting from the upper left corner of the: k9 z' D6 M! [9 b
                  ;; world.  -1 for non-intersection patches.
2 {. J" y  \  E3 w- d5 o  my-column       ;; the column of the intersection counting from the upper left corner of the+ s8 p  p" ?% z/ g
                  ;; world.  -1 for non-intersection patches.! m5 g/ p( I( C" g3 x2 _+ S2 @! ~
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ y* E) r6 c7 n% O# B
  auto?           ;; whether or not this intersection will switch automatically.9 B) S& i3 C- ~  Z
                  ;; false for non-intersection patches.1 ^2 e0 s  g' t2 E# X
]
  V# d- k) e( g& D5 p; z$ o. s* f  F& z; @7 k8 K' T
6 ~, X$ B. V3 C- o& \& |" ~) h
;;;;;;;;;;;;;;;;;;;;;;; C" q4 u" G- e, r6 w) ?% A$ [
;; Setup Procedures ;;+ P9 {* d0 x- C8 {: V1 O7 U
;;;;;;;;;;;;;;;;;;;;;;4 W# U! s2 V8 }, R& Z1 O" e$ F7 _

' I3 ^1 m" |8 b3 [+ h. x8 {;; Initialize the display by giving the global and patch variables initial values.; }: \& `2 }, c
;; Create num-cars of turtles if there are enough road patches for one turtle to
% g# d# E! [. f0 h6 E/ N; T;; be created per road patch. Set up the plots.
$ r( h3 Y$ w. k5 Bto setup) j, H$ F6 O# n3 M/ ?
  ca
0 o1 h- v2 S. x  W, {6 W  setup-globals
8 @0 C- L# ~) G5 n9 c: {  m8 L5 A: O8 Y& x, G) b7 W
  ;; First we ask the patches to draw themselves and set up a few variables+ g1 l4 t0 [/ ?# H
  setup-patches& @6 q; h: x$ s$ T3 w7 {
  make-current one-of intersections$ P( e: x# K8 M/ o
  label-current
: y7 a; U8 [  b2 h% K3 D. z1 n$ C/ J0 u
  set-default-shape turtles "car"
1 k1 x: i, z  Y2 I5 X$ I1 |# b
# i. K3 E6 j2 A4 @; }  if (num-cars > count roads)4 S, x; _8 T- @$ K% X9 k' U5 _
  [; {" ^; q* x7 O% X
    user-message (word "There are too many cars for the amount of "2 S( u# }: J9 `3 s9 y  V
                       "road.  Either increase the amount of roads "- p" s% Z* V1 Y- k; P8 Z
                       "by increasing the GRID-SIZE-X or ") D. j$ ?8 F9 l5 @# O5 u
                       "GRID-SIZE-Y sliders, or decrease the "
0 P( W  c- g+ B1 |                       "number of cars by lowering the NUMBER slider.\n"
( D7 o7 s7 [) J, p% B0 [7 `                       "The setup has stopped.")
. s% [8 b- u1 S& C- b    stop
3 F6 v0 z# W! C. r. r+ `: q  ]9 K& u+ P- m1 _: c) U0 q/ t
  }1 I. x. }4 e0 {5 i8 }
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* h4 c- H3 t8 \, U. y& C( O3 v  crt num-cars9 X+ r# g/ w) K3 D( Y6 \: R
  [
0 S! v; e/ Q  @" B    setup-cars$ \0 T: s$ P5 y
    set-car-color$ u! v  A# x, ~2 d: U! |
    record-data
0 x/ G" W: |6 n  ]
6 @8 Z+ h4 E% o" R: T8 c/ N& @% f  G) s+ f4 m/ F6 ?- v6 ^
  ;; give the turtles an initial speed. h+ K' J! p( F
  ask turtles [ set-car-speed ]# ?# A! J1 I" B# r
4 n2 R. F( K# H0 q6 k, t
  reset-ticks- M. W2 [; Q3 ?- a
end
; U; B" X' V/ m! ^* Z9 n: l- m2 |: _  y
% ]# v4 y) [6 Y* P2 {;; Initialize the global variables to appropriate values
0 p+ @# Z' M3 {( Yto setup-globals  Q7 Y/ L) D9 p* Z5 b6 E# B
  set current-light nobody ;; just for now, since there are no lights yet
9 x  f) E( r, }- v  T! @; g  set phase 0. t5 Q$ L$ P7 _  M8 E+ w
  set num-cars-stopped 03 \& m, c' t: `7 o; |5 m5 s, n+ d; C
  set grid-x-inc world-width / grid-size-x) i+ O5 A/ E, r! k1 n7 @4 o+ p
  set grid-y-inc world-height / grid-size-y
2 W5 r( Y; I5 Z
: E8 }) s" r: U0 B8 b6 |9 |  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& D. d7 \; w# _  set acceleration 0.099
& x( l- O' y; N$ q* x' b6 ~end: O" k: E! ~; Q+ }9 b
# H0 Z# ^# Y0 j6 a2 X
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. [' G+ e1 B0 S  j
;; and initialize the traffic lights to one setting
/ v! I' `* T" ?to setup-patches* \* `8 P8 B2 v  }& ~# z% U
  ;; initialize the patch-owned variables and color the patches to a base-color
% i4 m$ x! R0 G0 {! Y  ask patches) h; h" R) c) T
  [
, j9 D# W0 }' S6 q: _    set intersection? false; y5 V- E2 v8 d, K
    set auto? false
1 w6 R: f4 N0 P9 P% o, G    set green-light-up? true
, @9 H; Z! o' h) |    set my-row -1
4 _0 H) N( W( U    set my-column -14 V7 I5 Q1 C: F! t. A2 l7 I( w
    set my-phase -1
" d0 E% [1 \9 @    set pcolor brown + 3
" @$ V! X: {! ?, K+ @. P+ a  ], h7 y2 f7 ~; {6 n+ M/ k4 L
  m, m1 {$ M4 J6 _! v
  ;; initialize the global variables that hold patch agentsets
, p( h& {, |( X8 s2 Q- {, J1 ]  set roads patches with6 _- W: Z: F$ e$ O$ W: R+ p& ]
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 O9 A2 [# Y" O. P" A! o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# ~. c0 N& ?7 F
  set intersections roads with
) d- ~2 R7 G9 z3 D  Z' K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! N3 ]4 I& z5 ?. Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 Y6 T' p3 Q# W( c/ V) H6 X% l; u# I7 \* O
  ask roads [ set pcolor white ]
: ]+ @9 O8 z# o& u7 b* ?- x3 o    setup-intersections. U& u+ X: m* K' P5 W) T2 E
end
+ O; _: C# p8 q其中定义道路的句子,如下所示,是什么意思啊?7 }; J) t; n. q/ L" Z' S
set roads patches with9 s) C0 |' x8 o& Y; f2 H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 n; a% G: v3 U* N: p) Q0 t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 f) |2 ^- M8 P, z; P+ J; z
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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