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: 9721|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。
8 [+ P) n2 M  V  R. M3 r& Q  [netlogo自带的social science--traffic grid这一例子当中,
. Q  Y/ h+ H; B3 R& ]4 \; n2 C( }8 Q& cglobals' F7 e$ N" V+ w
[+ u- k: P2 N, X2 R+ |2 s1 T
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
6 k' D! L, n; V  M5 v  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 y. |+ c3 ^, o% x" y; B7 p
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
6 ^* P% L: I. E9 ^! E" _+ _                           ;; it is to accelerate or decelerate8 c" Q" E' y, T5 P: x/ f
  phase                    ;; keeps track of the phase
8 V. {9 I9 X$ n1 M! \1 _  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
* J! i) _; V$ q2 ]1 T  current-light            ;; the currently selected light
" J2 R2 b$ J3 W1 ~' y8 @
' n9 k" T7 l( O* F# d  ;; patch agentsets1 \# C5 S) I) g" y9 C9 q
  intersections ;; agentset containing the patches that are intersections
( O5 M, D! s) H& W" e  roads         ;; agentset containing the patches that are roads
) i7 J2 m3 w$ O$ G/ [: N" a; ^]
  Q1 c' q$ w( y% _$ [% v! P
* ~3 j: |1 H6 {9 j' tturtles-own4 I' Y  E0 x# ?1 S
[
  w5 w6 Y& @- I1 s) K4 z5 [& s  speed     ;; the speed of the turtle# P2 ]) q2 G/ s; i% d
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right! s9 j4 P8 ]. \; i6 k6 D
  wait-time ;; the amount of time since the last time a turtle has moved
3 z) [" [1 O' z) b+ w]
1 N: K; e% ]4 n/ W, P  y$ L: o3 E  {8 @
patches-own
, B4 ^7 Q' d5 d( A[
' [& @% h2 T  H/ X; S" V1 _  intersection?   ;; true if the patch is at the intersection of two roads
/ n; G% ^) A4 z+ Z2 N  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ j1 H" ]4 x9 o: D! }, O
                  ;; false for a non-intersection patches.
+ J$ ~3 g0 R) q0 t0 d  my-row          ;; the row of the intersection counting from the upper left corner of the
5 P; z0 I% k8 s6 L2 w1 W7 S                  ;; world.  -1 for non-intersection patches.
9 z+ d9 `9 |$ t( b% A  O4 K  my-column       ;; the column of the intersection counting from the upper left corner of the
% W$ k+ v- x) r5 [0 E                  ;; world.  -1 for non-intersection patches." G# t! X; a: A: ?# ?3 \
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.- v, b  l' {4 c. Z- M( y* b
  auto?           ;; whether or not this intersection will switch automatically.
. K- M! n6 L: j2 }6 m                  ;; false for non-intersection patches.
( d! N5 y3 I8 q( H* R. k- _]) s8 }9 ?) T% ?( ~. r4 N

9 m: H3 E1 V, o4 C
8 Z4 B0 x+ Y2 T;;;;;;;;;;;;;;;;;;;;;;  M8 N, ?, q' }& V; N! D
;; Setup Procedures ;;
7 G8 C( c0 j: U;;;;;;;;;;;;;;;;;;;;;;
6 U8 Q' f. A5 G6 d7 o% Y* Y, {/ c6 ]5 B* B1 g+ K* e
;; Initialize the display by giving the global and patch variables initial values.
4 A3 E3 L2 Q/ J# z3 a, S9 E;; Create num-cars of turtles if there are enough road patches for one turtle to
4 ?* P4 m; ?* F$ I! n; Z;; be created per road patch. Set up the plots.
; @0 Y9 U& Q; @7 Z! H1 Vto setup. }- ]* g( T7 z, T. A8 S( N
  ca2 u. M: D7 q* ~( ~1 C, ]
  setup-globals, z9 e5 F8 [! |: S

- F. S4 e' a) E; G* R) U  ;; First we ask the patches to draw themselves and set up a few variables, U" z* m. S* w' M
  setup-patches  G; K, _4 p. z) L& j
  make-current one-of intersections0 \* R( ^7 D7 o) @8 L' E. @+ J
  label-current/ l! v* _9 C5 r+ D1 I
+ m" L$ R2 _7 I- M& R9 [. g
  set-default-shape turtles "car"
9 c" V/ p0 P7 u* K2 P* W' `" j! R! `7 [; C6 L; t) o. g
  if (num-cars > count roads)
. l, c' H3 y0 }. u6 E/ B( h  [) P' d8 ^' c' `5 m" J
    user-message (word "There are too many cars for the amount of "
7 c  D+ r7 N. Q8 `; {9 d1 B                       "road.  Either increase the amount of roads "7 q7 y" r: Z( r
                       "by increasing the GRID-SIZE-X or "
. p% p, N/ R& X6 U7 u6 [                       "GRID-SIZE-Y sliders, or decrease the "
# W; U( A! B" `( @; j2 Z                       "number of cars by lowering the NUMBER slider.\n". [4 N' S# x: ^
                       "The setup has stopped.")
' `) s/ |  Q8 o4 H# C1 k# A    stop0 Y( ^0 Q/ G; c: p, u8 E0 i1 \
  ]0 N$ ?4 d& L  j9 a7 i( S
4 v' p, J5 |+ w9 S7 w- d2 B0 ~
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ }7 O0 L9 v4 t/ u  crt num-cars
( l( w% E: ~" S8 @! ?$ p5 ]- ~  [
' _$ J7 @# y% h7 @% \4 M, x; U    setup-cars
5 D6 l+ t' B' r    set-car-color4 J5 h* m: [- H# c8 Y1 u
    record-data
/ b1 R7 j3 F/ u/ _3 u3 S  ]- X4 D9 B8 Q% _$ F" m, x
: |2 h1 q" g1 I& d5 Y* k2 p3 X( ]7 E
  ;; give the turtles an initial speed
2 Y$ S* q& Q4 Y( I6 r  ask turtles [ set-car-speed ]  v+ `+ V  H9 F7 C8 e6 \4 }

& w! P8 K& n7 E# ?  reset-ticks
* e4 C! \) v7 nend$ d& q" `3 k' g
( `3 g9 s6 @1 F  S+ ?
;; Initialize the global variables to appropriate values
* Y4 G  x, S% `' b5 F* \# Kto setup-globals( A# |8 m7 e) o) e  j- ~  O7 \+ F
  set current-light nobody ;; just for now, since there are no lights yet4 T( r0 T2 g& q9 ]
  set phase 0
. P; ~+ ~1 c' b6 h/ C& C  set num-cars-stopped 0$ F6 O+ R6 v! R0 d
  set grid-x-inc world-width / grid-size-x
6 N& S2 I% k5 |2 M  set grid-y-inc world-height / grid-size-y' D& C) N8 y4 _2 h% ~! k
  N: E& `; a1 I1 z
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 i/ |7 Y: ~! Q1 I: }6 V
  set acceleration 0.099% u& ^% k* T2 w7 }# l$ R
end: U0 ]2 X" h# _
, {2 h* G! u3 O% X" [0 {* A4 x
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- ^/ G; Q9 i  A3 z0 a0 U' k" ~
;; and initialize the traffic lights to one setting0 X1 n& v% @; u
to setup-patches
( d3 M- o8 d! F$ ^# V" M/ C  e  ;; initialize the patch-owned variables and color the patches to a base-color
1 Z) W: B, d# `5 e7 x& k  ask patches( D3 k+ l0 A" V# m: g1 }  D8 P2 L
  [
, B4 g  g6 ~' B2 _1 D2 v    set intersection? false
( c# f( Y6 n& Y; Z    set auto? false& x" n2 t8 c+ ?/ U
    set green-light-up? true
- s5 F' g7 h1 }. m+ z8 K    set my-row -1
. y6 E# u6 |: L* V    set my-column -1; S4 b+ I% D' |" J  I* F
    set my-phase -18 Q" V9 V8 M6 y! @7 j6 u3 R. N
    set pcolor brown + 3
  L8 ^. n8 y0 h7 D" g$ N/ r- I  ]
4 l: c0 G6 W) }; X8 G% n; j+ I- |) q2 h- `: H2 u+ F
  ;; initialize the global variables that hold patch agentsets, ~$ d2 m  S) J
  set roads patches with
8 g& c7 s6 X) Y! F' N- X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 b7 s( X1 s: W- c) z5 R  Z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# S1 m3 d  e2 \9 c$ h3 f
  set intersections roads with" Y$ P$ ]  R& t- F4 u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# }; E- L2 H' d0 l. S" o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% Q4 o9 a; _+ r+ A
$ J# {9 D6 Q0 g' v# d4 M: d8 j2 j  ask roads [ set pcolor white ]
  F1 a$ I+ e( u* ?$ B  D    setup-intersections
4 ?1 Q0 _# {( U; @end
) M+ D" H# X3 v8 Y! i3 _其中定义道路的句子,如下所示,是什么意思啊?8 e( ?, ^% G  v
set roads patches with3 t% U2 ~6 O0 ~. f9 ]
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 d' `# k0 i' L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 `7 e* U! R3 i  a
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, 2026-4-28 04:35 , Processed in 0.017276 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