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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。
" ~- E7 _& @6 [! m5 F" O+ nnetlogo自带的social science--traffic grid这一例子当中,
$ I2 P/ g7 O+ N4 O0 T# [% X4 oglobals
  k' ^2 S6 ^( I& O0 K8 R[
& ~1 P) B8 @# `" g! @9 t+ M6 ], k  grid-x-inc               ;; the amount of patches in between two roads in the x direction
, V5 ^7 E% q9 ?3 M% z. ~  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 o( Z+ T2 H) K4 b/ l  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
1 q  D6 f8 v, p& d( f# W, t                           ;; it is to accelerate or decelerate8 f- l* s9 v5 @1 g
  phase                    ;; keeps track of the phase9 W- b/ Q1 M5 C% l2 e
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
3 T* {1 @; P2 t! v$ w  current-light            ;; the currently selected light
3 ?$ |, b6 _& T; j0 {+ Z1 ^7 M
, O- ~, |3 h$ P! u9 t: b; n0 J+ u  ;; patch agentsets5 u# V$ A7 ^+ x; @( T  a1 `3 ]5 ~; p& T
  intersections ;; agentset containing the patches that are intersections
# d/ m5 A7 m0 F0 B- h8 d  roads         ;; agentset containing the patches that are roads; G1 S% F0 v5 V+ y
]
) }% k& R6 J) o
2 o# S" `% }6 B4 u, d" Zturtles-own
6 `# _6 [8 C: A! g( g7 @3 o[
5 ]  E4 v0 J3 Q, v# Z; l  speed     ;; the speed of the turtle
1 W% _1 Z$ d- p1 U% W4 v  up-car?   ;; true if the turtle moves downwards and false if it moves to the right* r! m6 @  C" n, X
  wait-time ;; the amount of time since the last time a turtle has moved
% u$ {+ m2 {) S! y]1 i2 c; v9 e# _8 E! T2 I

6 R) N; Z. Z' O. V$ {, @8 h6 v: Jpatches-own
% @3 L! y+ N1 ^% f  _! j  b[5 p' y7 u7 |+ J1 v, S# A1 v
  intersection?   ;; true if the patch is at the intersection of two roads
+ {* F1 }" X  n, M  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.6 h/ T/ L. {' H; e4 A+ f% Y9 k
                  ;; false for a non-intersection patches.( |- P: K8 x, U2 ?6 V
  my-row          ;; the row of the intersection counting from the upper left corner of the
- v  C/ L. b4 L- c                  ;; world.  -1 for non-intersection patches.  B* Z6 W, [( k* |+ T& l# _3 r
  my-column       ;; the column of the intersection counting from the upper left corner of the
" P* T4 W" F# ^                  ;; world.  -1 for non-intersection patches.
- h/ T0 G- Z" _  N9 f& W1 {2 S) s  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: E7 ^& L0 [4 ~1 R$ r; I/ b  auto?           ;; whether or not this intersection will switch automatically./ M" F3 ]8 d' M* Z  m
                  ;; false for non-intersection patches.- w  {  w/ M/ n/ ]. Z3 b
]* n5 e* I8 Z4 C- ~# c

& r% e5 N, a/ e* [+ o
6 `0 p# P2 M9 A; y;;;;;;;;;;;;;;;;;;;;;;
* O0 E  C1 ]4 M;; Setup Procedures ;;) W+ d" `' {: A
;;;;;;;;;;;;;;;;;;;;;;) K  E0 T( n! p. D9 K
8 N& E9 I& J+ [6 {
;; Initialize the display by giving the global and patch variables initial values.$ U. |/ ]8 z: G8 f! o2 q% U* k
;; Create num-cars of turtles if there are enough road patches for one turtle to' x2 ~! b* N$ D
;; be created per road patch. Set up the plots.
* \0 c+ I& `' W# g6 V1 H% l8 {% ^to setup
4 U# W: {/ M$ r3 m4 x# A  ca
' I. B, b6 k- V$ J  setup-globals
, E  A3 h0 D9 c4 L1 G; h1 ?8 C7 i2 f5 g4 R  `8 s, f! C$ |
  ;; First we ask the patches to draw themselves and set up a few variables9 U  n+ M4 b( e' u8 c+ H
  setup-patches
- r3 P; ~4 G- L/ Y- x3 o" h  make-current one-of intersections% ?: c7 `1 \) m; Z  I5 E
  label-current
7 ]$ N( I. n$ e, \6 d3 b
3 C/ W1 i7 ?3 |3 c, J0 _  set-default-shape turtles "car"4 `" \5 u8 }! t
+ Z! [- O# p9 q1 v* e
  if (num-cars > count roads)
$ t+ F' T, m2 [  [$ K% g5 J& y' c* g, N; m
    user-message (word "There are too many cars for the amount of "
/ B8 a6 y3 B" T; q$ U2 q                       "road.  Either increase the amount of roads "
. E4 a7 _, \5 {7 W0 N9 U1 a                       "by increasing the GRID-SIZE-X or "
0 A# M: ]5 G( j: S, g                       "GRID-SIZE-Y sliders, or decrease the "
8 w+ Y* V" p0 H9 Q( Y; |                       "number of cars by lowering the NUMBER slider.\n"
* ~, {' {- |, b/ e                       "The setup has stopped.")
5 p$ k' g# C# o, W+ L& U    stop
. L5 L8 `( d! V$ Y9 u2 d  ]
8 Q1 U- J( e9 |# K, b+ `: j* U
8 I( p2 G; P% \& k0 |! d0 B' N  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- e" V# E+ z7 i; r$ Y( I+ X2 t7 @  crt num-cars
5 E+ F8 e5 [- n7 a6 S* g% j  [
/ Q1 K# j  G- N8 ~; O/ J7 n    setup-cars
6 ^" {* E6 r/ P1 ]6 ~    set-car-color) Y) H: J& G, A( ^3 h  [" l
    record-data; E# |6 q6 Q* I) ~1 n
  ]& D' b- W4 \" H
, a5 V/ ?0 V3 e4 c
  ;; give the turtles an initial speed# Y& L: P4 P5 p4 Q+ y  R
  ask turtles [ set-car-speed ]
0 Y; Q' B7 V* q8 q) {  E3 W; N: c+ _( @
  reset-ticks
8 r' \" U5 w+ Q) u  u; b2 [end2 U" @) m( h$ V  |# \
: t' |$ [- _0 [& R
;; Initialize the global variables to appropriate values
8 S3 V8 O$ z' H2 M0 ]0 C- C, H1 eto setup-globals
1 D" [0 d! ^- t# A+ Q8 F7 V  set current-light nobody ;; just for now, since there are no lights yet
* a. t5 R' Q& J% |2 o0 G9 k  set phase 05 M$ S# V' B/ ?6 M; H
  set num-cars-stopped 0
6 ^$ A& ]3 f) L' i7 f  set grid-x-inc world-width / grid-size-x2 S( H) R$ ^3 `  ]; L
  set grid-y-inc world-height / grid-size-y: E+ ~% Z# s& J: S( [; F
# v8 ?$ |8 W  l5 y2 u
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. Q1 s% B& G% s; i) }! s7 T6 g6 u
  set acceleration 0.099% W0 M" t' q% [. M# b" X8 j
end( ^2 z1 E5 i2 k9 H& _8 T& e

. O- y. w" l6 N* v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% f) z5 I- J( `  d
;; and initialize the traffic lights to one setting
: i& m  E1 f7 }' _4 q+ d- xto setup-patches
. {' T$ L0 L  X# l% s  ;; initialize the patch-owned variables and color the patches to a base-color3 L: D: s8 j5 t" E  {! U3 A; Y
  ask patches2 d! j- s: L( k
  [/ a' X- O* V# p# U5 A4 T
    set intersection? false- @) ]  V, z' A8 G4 \
    set auto? false" F$ _- \6 x# h* ^
    set green-light-up? true
# ^1 ^& r0 v, W1 U0 d; |    set my-row -1, v3 Q- V$ y4 u2 `0 f+ D
    set my-column -1
$ N2 U8 x9 i# V1 g% j    set my-phase -1% o# N1 p" O+ j
    set pcolor brown + 3
% g' n" I$ o# n+ }9 \: T; K1 A2 B* t  ]% o1 ?  [8 ?. E4 S( ^
2 u4 T9 P1 Y, ~3 o9 g+ u
  ;; initialize the global variables that hold patch agentsets
  u" U  |# L; j  set roads patches with6 A% M* H4 a: u6 v/ D7 }( w, U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. {: W+ m1 C, ]6 I4 a! D% x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 Y& T  u  E; @; B2 t& _  set intersections roads with1 t) v( w7 r$ F2 N4 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ b: O; G7 y2 ~+ O* O& O  @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 u$ B1 |- S! }9 w' g
* M* v% F" X+ G; [0 m! {  ask roads [ set pcolor white ]  M8 o% ^" w6 ?" q& J; A. Y" i
    setup-intersections
) s/ ?: K$ W$ D4 P7 ~8 O0 v: xend
  M# {& d5 s5 E7 U6 F* r4 q) G其中定义道路的句子,如下所示,是什么意思啊?  @9 F9 {1 ^8 u
set roads patches with
2 p' w5 a9 Q6 n3 k, @8 U; f3 h; D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 W7 J$ J4 r7 R' {+ X4 d* q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ R8 L* a6 v+ o2 B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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