设为首页收藏本站

最大的系统仿真与系统优化公益交流社区

 找回密码
 注册

QQ登录

只需一步,快速开始

查看: 10173|回复: 0

[求助] 在看例子时有几个问题看不懂

[复制链接]
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。
9 O( H2 V; |$ H2 u1 K* xnetlogo自带的social science--traffic grid这一例子当中,
  P; M& j$ t* B  iglobals! |  v9 K- U- ?; u/ U4 h
[
/ V1 u1 G6 _9 H% l, g2 ]  grid-x-inc               ;; the amount of patches in between two roads in the x direction
, n4 H* f4 E! \# ~/ O: `+ C  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- Z* |; B5 Y/ x0 S  l2 C  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
, j" g- x6 r7 e; t/ s                           ;; it is to accelerate or decelerate. [5 c7 a1 u( s7 T- m6 j
  phase                    ;; keeps track of the phase% K- J  w& ^- m# `2 r
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure# f: u8 ]3 T9 g
  current-light            ;; the currently selected light
- r  ]+ t( a! E" d% |" v
* g3 _, ]3 H+ ~  ;; patch agentsets
- \6 ?. I/ Y. b" o3 A' H  intersections ;; agentset containing the patches that are intersections
2 [$ k& q0 L' u, F, m' F  roads         ;; agentset containing the patches that are roads
% P' e0 D% [* r( L' D" v( x4 O]( s4 N' M4 V1 [$ j& m* A

$ P; B0 {* Y, Q! l6 fturtles-own% e$ p) r4 g) Y9 s7 a/ T
[% V5 D& E& M8 s3 B9 \4 I5 R
  speed     ;; the speed of the turtle& Y( {) B4 ]$ }- l- f
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right" f3 U% d! k- z. U* A( x
  wait-time ;; the amount of time since the last time a turtle has moved" ?. U* ]* ]* z3 f) T  m
]
) N5 R. H: u; y! A, l) v
$ Y3 Q  _& |( Y  t- C$ ~/ Fpatches-own
5 _- p% W+ w, P+ _. X( C[
( q1 q7 S. ?0 V  intersection?   ;; true if the patch is at the intersection of two roads
; f1 ^! l$ E9 G0 Q, w  j/ `  @  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
8 `1 N, _& I; |$ a1 U. E( O( |* Z                  ;; false for a non-intersection patches.
: b3 U3 Z- S" j4 Z  my-row          ;; the row of the intersection counting from the upper left corner of the
' X+ m# c- Q7 U3 M) t# I8 H; ~                  ;; world.  -1 for non-intersection patches.7 H9 V2 p* V; I
  my-column       ;; the column of the intersection counting from the upper left corner of the
- X, x# H" J& x0 F3 b$ u/ j* h- U# _                  ;; world.  -1 for non-intersection patches.
+ K* Q; s% l0 ~! W, f  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 X2 _. S0 I9 i$ R$ u( f7 R0 o
  auto?           ;; whether or not this intersection will switch automatically.# O  |0 a  l" X2 U3 _! ?
                  ;; false for non-intersection patches.
! o& q2 w4 l- u9 o7 f]' a$ x4 H! a0 h2 H
7 ^& d3 s, D" C( I  L
" d7 T$ b; c( ]9 y: p: r
;;;;;;;;;;;;;;;;;;;;;;
2 o) W" l) L" s- C$ @' w;; Setup Procedures ;;
' G7 ^5 ]$ A, j4 ~6 o) R;;;;;;;;;;;;;;;;;;;;;;
# k+ S. I; [+ d# c/ Q+ ^6 g/ k
/ n% S, G4 n/ ?% k1 i;; Initialize the display by giving the global and patch variables initial values.1 H! ^$ C) ]4 F- p3 D" K  d  ?
;; Create num-cars of turtles if there are enough road patches for one turtle to8 r2 O/ m8 B+ e0 b6 I
;; be created per road patch. Set up the plots.
$ a- V+ ~- g9 ~1 vto setup
$ v2 e1 M' C$ `; n( C  ca8 F3 V# g" N+ }; D( H# B
  setup-globals4 C7 m& o. c  s& O0 l
8 t- ^: B  p: y7 I. M
  ;; First we ask the patches to draw themselves and set up a few variables2 K4 c/ c$ a( {8 N# Z% Z
  setup-patches1 v9 G& H  G- r! i8 ^
  make-current one-of intersections
* X/ I: c: i9 O* V$ G9 O' ]  label-current4 j* [  q5 k9 n
3 z. Y, u, v" B) f
  set-default-shape turtles "car"2 M! M4 i2 j: j- ~1 ^" v

1 k2 L' ~& _$ ]; ?1 |# y  if (num-cars > count roads)
( w- s! v" {0 e  [
  B$ v# o- L: v) c+ b) g: D7 p    user-message (word "There are too many cars for the amount of ", w8 H8 t; V' ?) N9 Y4 b) ~
                       "road.  Either increase the amount of roads "
& a2 P3 T0 N/ @. y/ w+ o0 E* B                       "by increasing the GRID-SIZE-X or "* a9 ^2 E5 @) H" r7 x! R
                       "GRID-SIZE-Y sliders, or decrease the "
8 x0 h5 `( Y1 C, N: R                       "number of cars by lowering the NUMBER slider.\n"
9 Y6 f4 M& N6 Y. Z                       "The setup has stopped.")
2 `5 S' f8 S% Z2 p    stop: S4 P7 K; e4 n2 k, k( i! c& D( |
  ]
2 f  _7 V, N: Q3 Z& D2 D# R7 @- ^
6 ^( `' H( J) `7 }( i4 P  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 g0 U/ @) S) U2 K( j  crt num-cars
5 F) I: M! t* T; j  [
* I6 B, E7 p7 g  Z' U    setup-cars1 {' b# q: c3 p7 Z( n
    set-car-color& `, j0 P. T( T$ e
    record-data
3 p+ v. V/ f7 X8 m7 n7 U; p5 F# ^+ [3 N  ]
5 u$ ^: ^8 w0 ~, x5 `4 I2 g) e
$ C& w: X7 l3 r+ E. n  ;; give the turtles an initial speed% @1 X, q) ?+ _% M/ o4 F% F: p9 k. g
  ask turtles [ set-car-speed ]9 q, n: B* E& V; g, ]6 M1 c  l
5 L: `, D2 q) a8 o" f  Q
  reset-ticks5 V2 b0 N% K- Z0 [' G
end8 w2 Z! n& P+ E: S

3 S  M! n- f) \; f;; Initialize the global variables to appropriate values2 t! B! C0 o& o3 Z
to setup-globals
  o( \. U+ I$ S1 |5 C  set current-light nobody ;; just for now, since there are no lights yet
, [, ^& C8 T3 v3 \9 n" f  set phase 0
- e, c+ q  @! \0 K  set num-cars-stopped 0% ]) M' x/ ~1 e- D! ^
  set grid-x-inc world-width / grid-size-x6 @. h. J4 ^& k- p% q
  set grid-y-inc world-height / grid-size-y
% j. z/ `3 c* [; S; I$ r' c- ]9 o# d% d4 {3 X
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 j- Y  g8 A, e0 v! w! G  set acceleration 0.099
$ ~5 A- h& i1 z" v5 @( mend" f4 [0 E2 I! K8 L7 J- q5 t

. l' N, y2 q7 ^# M;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ t1 `* ^" a3 R& D0 \2 C;; and initialize the traffic lights to one setting
6 W8 V5 {9 Q4 jto setup-patches" R* v: }. G1 _1 X8 ^3 w$ U9 @
  ;; initialize the patch-owned variables and color the patches to a base-color5 k& U2 ]/ E4 C3 ~
  ask patches
- o6 R/ H6 c* J5 O9 P% \  [: b7 d' h6 s, T, s
    set intersection? false
% {3 C7 a3 M& |- U; m    set auto? false- f; R: e# v* p7 w
    set green-light-up? true+ q  i" r4 w' p) b7 Z$ W: K4 L
    set my-row -1
. a: f3 a& X7 i: l* c    set my-column -1, ^. Z: U( R0 ~$ j6 P5 F
    set my-phase -1' j# K! T$ V  f
    set pcolor brown + 3$ ~& e- d0 R% e  T
  ]9 ]0 v4 y5 i+ R
$ D2 z9 ?; E, @) Q& C0 x
  ;; initialize the global variables that hold patch agentsets
; i1 g0 \1 v; j( l) O! ?' \7 \/ u  set roads patches with
, m: P, u- o# j, i4 P6 t- ~) w3 N3 R# q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 X0 }1 b9 N# w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" S) J* o, R. h* A& G* \6 \) l
  set intersections roads with9 |2 [9 t; Z$ T( t8 f+ x
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 r2 J( z9 `0 p" f2 Z7 z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& q" |: D7 ]9 C: @* W: @/ P# @0 X5 h: ^" ^1 a3 T, t& ^
  ask roads [ set pcolor white ]
  j6 h& f- f8 p% k0 ~    setup-intersections
9 H$ l) F7 Q: Cend
* J3 b! X0 |7 G; V% K! G其中定义道路的句子,如下所示,是什么意思啊?
' U) _6 K& s" H3 E% m0 ] set roads patches with. P! Z+ V; x# u; C  \2 P. c( X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 E0 V, n( _) ~; f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ G- M3 Y) h% y: E% W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?
您需要登录后才可以回帖 登录 | 注册

本版积分规则

QQ|Archiver|手机版|SimulWay 道于仿真   

GMT+8, 2026-5-21 13:28 , Processed in 0.016025 second(s), 15 queries .

Powered by Discuz! X3.4 Licensed

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表