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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。
0 f" h' B% t, l/ S0 Lnetlogo自带的social science--traffic grid这一例子当中,
6 S5 K3 ^, Q/ u. X( v) n" d5 {globals+ M8 o) G/ i; @# j! ]$ M, n
[
6 [% {4 r% d' g  grid-x-inc               ;; the amount of patches in between two roads in the x direction
' S- n  [' R* f: B, Z5 N9 V2 Q  grid-y-inc               ;; the amount of patches in between two roads in the y direction* A7 f7 ^; R3 a7 N: R; _, p
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if1 P& Q- b3 C4 d* _
                           ;; it is to accelerate or decelerate+ h! g0 k6 ~( k$ z- E# n4 N
  phase                    ;; keeps track of the phase
# S' B, l3 T) q$ Z* \5 Y8 G  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ H6 A5 V7 B( w5 l  current-light            ;; the currently selected light
- U+ T+ ^! w1 Y' `
4 h' j9 p' K5 i+ Q+ D  ;; patch agentsets& ~9 z1 z% j6 a  _2 A
  intersections ;; agentset containing the patches that are intersections  x$ J3 ]* H$ _! Y' p
  roads         ;; agentset containing the patches that are roads- }% C9 y( |0 ?: w* S
]% O7 W2 U8 H2 `/ ?7 B1 P' F/ c

+ U/ p# B- n. Z! ?. }turtles-own9 U+ Q) x0 N# O' y% z9 p
[* e3 L" s" h8 d0 }
  speed     ;; the speed of the turtle: k; Y- t9 A3 P
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 m4 E- e4 B1 t& I4 s  r  wait-time ;; the amount of time since the last time a turtle has moved
, B- m/ X- G, Z" c' r$ G9 N]
! z, A( g  {: H9 q6 W
) H0 o: Q; ?( h4 Z) Zpatches-own9 z# n) a; G- H& ?- Y" M$ c4 G
[
& C$ q( W& r, A# @. @  intersection?   ;; true if the patch is at the intersection of two roads
& j- z+ Y8 U9 l+ K  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.8 O" |; E9 }1 ]) A6 O, {: a
                  ;; false for a non-intersection patches.( X* ]+ J6 Z& q/ O$ d
  my-row          ;; the row of the intersection counting from the upper left corner of the
) d4 K! a" _& x8 [4 \( S                  ;; world.  -1 for non-intersection patches.
7 X& R) }7 F) P$ J+ T  x/ \  my-column       ;; the column of the intersection counting from the upper left corner of the$ H9 N+ t  ~4 E8 F
                  ;; world.  -1 for non-intersection patches.
5 `8 g; q) L1 C6 u  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 H+ C+ B0 V% M" ], D  auto?           ;; whether or not this intersection will switch automatically.7 o# B/ W, M+ ^0 n" G2 {
                  ;; false for non-intersection patches.7 t5 `" R6 ]2 y* r. `4 E3 w! Y7 C
]0 t8 m1 c' }3 y* K# d1 x% g& x
4 N" o' M1 [$ P4 c

9 ^* m8 b2 k! S& q6 {8 X/ T7 p;;;;;;;;;;;;;;;;;;;;;;
2 _" V1 w' F( m;; Setup Procedures ;;4 |: Z2 L" U8 W- e+ F# L
;;;;;;;;;;;;;;;;;;;;;;2 Y* d6 z) Z/ t2 N; |! j% h  B

2 I+ i- d5 g" s6 `5 G;; Initialize the display by giving the global and patch variables initial values.2 T+ U$ v, Q$ M" X$ u
;; Create num-cars of turtles if there are enough road patches for one turtle to! ]; a  P; H1 s" j0 a
;; be created per road patch. Set up the plots.
% f+ D# U; @' a* g% rto setup
: |9 C/ j# W; Q) C  ca
" H% D6 L' T& F6 c7 [6 B  setup-globals
) _! K. T3 S; z0 G# Z+ B' P7 U, @0 f4 l7 {0 q  x
  ;; First we ask the patches to draw themselves and set up a few variables
! [5 e" d8 v' s$ D7 T0 Z9 r  setup-patches
3 Z) U/ w& T4 y  k! |  I8 v: c* N  make-current one-of intersections
8 g# `% S, f( u1 z, ^9 a. r  label-current
7 W9 p  P/ J* d1 v. L
2 x2 w3 {" d: r, W' x& H' u  set-default-shape turtles "car"
6 Y& J+ w1 K$ g: A% W7 Z' i
* Q3 F' L1 `1 B$ v  if (num-cars > count roads)3 x3 m1 z& B; v( k
  [' M0 p! u, V- J8 W; }! t
    user-message (word "There are too many cars for the amount of "
7 m% M. F% Q% a: z                       "road.  Either increase the amount of roads "
/ J% E8 T2 T' \/ l- w! Z                       "by increasing the GRID-SIZE-X or "9 x$ q& u4 \; ?
                       "GRID-SIZE-Y sliders, or decrease the "
' K2 R7 s' d: a( N1 [" g                       "number of cars by lowering the NUMBER slider.\n". Z8 ~  ^6 I/ Q( G4 p+ ?
                       "The setup has stopped.")
3 D* I  B0 e1 O4 ~8 ?( y    stop0 E! [/ A1 M% N, ]( k* B! _
  ]
- q6 W/ J8 Q  B7 i7 v
: g" D( u. C6 ?2 H, ^  T! ^  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 r$ u9 v7 {) o5 R5 J$ B4 P9 H
  crt num-cars6 x( `% h5 [# J- b
  [, t5 d- V% t5 a$ w9 s1 v
    setup-cars3 _. A) N" ~; G, U2 u' s7 F
    set-car-color7 t+ W6 H3 S/ `# r) y6 o8 D+ J
    record-data
5 g; ^  x2 \  v' W% T3 g3 s8 I( a1 d  ]+ L; G8 }7 {6 n. V

- e8 S& ?" e* ^  ;; give the turtles an initial speed4 W7 S1 p8 F; G; ~; K
  ask turtles [ set-car-speed ]3 N7 z: u8 E! ^# J- B
& D+ q: A, k: h- f# s) @
  reset-ticks( M4 o6 @" G7 x0 i) x6 k7 U
end, t0 s) \5 l" E
5 O" R& |+ G. J
;; Initialize the global variables to appropriate values: c2 [6 e$ j' t$ W5 `; Z; Q
to setup-globals
$ F6 _8 \; v% a* B; U1 M9 H  set current-light nobody ;; just for now, since there are no lights yet( M# Z. F1 v( i; W$ O
  set phase 0' l4 c0 ]- h  y1 y: j
  set num-cars-stopped 0, z* t- m. N" q) }8 M( T
  set grid-x-inc world-width / grid-size-x8 C! c4 ~5 W/ p7 n
  set grid-y-inc world-height / grid-size-y. i/ W) Z2 P3 a9 T

2 c( F$ S0 D2 F- h6 N6 L* X0 j  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 Y$ j5 G( v# y( W* W, M  W3 x
  set acceleration 0.099
0 W# r2 l  P# y6 I3 S& Y6 {end
/ W" X# z+ v1 m  j6 m0 \" P  i+ R5 @0 m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 ~8 H3 i) g3 k0 ^; |7 p2 _
;; and initialize the traffic lights to one setting
$ ?  r3 U  m& J) B# Fto setup-patches
( B  ^, A7 q; Z2 E" f& T  ;; initialize the patch-owned variables and color the patches to a base-color. b* Z; ~7 d  O* H1 J
  ask patches4 S. X) \7 n. {! z! a
  [7 Y( }% O; f9 m% b
    set intersection? false- h: v1 k" A1 R! O: ]1 Q" E
    set auto? false9 s# W0 N$ [1 {* @% x! G
    set green-light-up? true
5 i$ c- |+ i/ F, t  L' R3 A$ v    set my-row -15 [# N  h" e! }! ^9 `) F, X( T
    set my-column -1( a& e. g: A! o* y* x7 m
    set my-phase -13 L' b- Y% }+ h: N. r, ~2 m$ U
    set pcolor brown + 36 B, h# T/ d' h9 t/ J# p. x
  ]% |: Y2 I- F3 ~# v* }# C) `6 R

% Z0 d4 e1 Z  m3 h  ;; initialize the global variables that hold patch agentsets2 a7 }; n7 y) r# k
  set roads patches with& l0 i  c4 z- o/ I( F" M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 \7 @5 T1 n# t* A. b/ ^0 q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, \* t( a  \' e' I, P, L  set intersections roads with2 \4 G1 f$ v( x) w( C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* m1 S1 ]2 o" P1 h! m5 g7 W3 s    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 m( `# j: z6 b

( C' z- c7 k7 a7 T  ask roads [ set pcolor white ]
' A1 a; e7 T3 Y0 `( S    setup-intersections
# S( L: P5 _" q! lend
& Q( B3 r4 s( b  V其中定义道路的句子,如下所示,是什么意思啊?
# h( Y; _) n4 A7 }6 ? set roads patches with
. |; b  q2 {0 G4 _& H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" \* G! |6 u9 ?* L  C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 ~- O+ s% ~. |1 j2 J2 W) `7 T, Q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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