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: 10609|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。$ R: {$ d+ f4 h5 w
netlogo自带的social science--traffic grid这一例子当中,, y) t9 W' E7 C! p8 ^& C2 t
globals
# R0 S& t  M/ q, m# j; a[
8 U, z" O2 e. p  U1 Q! h9 x  grid-x-inc               ;; the amount of patches in between two roads in the x direction
& X- D! O' C9 y, d  grid-y-inc               ;; the amount of patches in between two roads in the y direction( q4 Z% Y) v- m) v: Z0 m* I% r
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 F: I+ x; K; W: X
                           ;; it is to accelerate or decelerate- O% [* d* s  m. ]
  phase                    ;; keeps track of the phase
9 p* g+ R) I. U5 p/ o& a+ V  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 r. k: m$ r& n5 t
  current-light            ;; the currently selected light1 C* |2 K! b4 `$ T8 l0 d: b( h3 j
$ j- C0 y* `" h' o$ e
  ;; patch agentsets
( C; p% L4 t1 |% c# ?  intersections ;; agentset containing the patches that are intersections
8 d+ Q+ t' G% v4 a* I# Y7 W% c  roads         ;; agentset containing the patches that are roads
7 T: r- Q+ n  O' k# R5 ~' e1 }]( V# q/ e  u9 c) w/ L* E' V

% [! x$ [% p7 {$ k& `turtles-own) \, @  C& v7 O/ F9 z2 e; k
[/ E, Y) `+ p- m; F2 j
  speed     ;; the speed of the turtle9 _. s& Y8 s2 G7 V. y& O7 a
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
7 b4 h) w0 L0 _# l1 ?  wait-time ;; the amount of time since the last time a turtle has moved+ |/ W) p, v& g& ]4 m% f3 j9 }
]* }- K9 I7 M3 s( Y3 [4 z5 |
$ H; v* N  c* j6 w/ Q# b, ]+ Y
patches-own
# l1 G* z4 Y. z1 U9 P" `! U$ `[
3 s$ F. o3 v5 N  intersection?   ;; true if the patch is at the intersection of two roads
1 U9 C) u$ @  n1 j  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
0 j1 U- |0 W% N. f' N$ D+ t                  ;; false for a non-intersection patches.7 i4 p% c0 E2 U7 o# M7 z6 c
  my-row          ;; the row of the intersection counting from the upper left corner of the) E% q, F/ K: n; P+ [
                  ;; world.  -1 for non-intersection patches.
- \' h- S( J1 p2 T/ f' R' H  my-column       ;; the column of the intersection counting from the upper left corner of the
0 [1 S! J# E  f* ]: X                  ;; world.  -1 for non-intersection patches.
3 A* @2 w; C" Y$ ?. u  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.% J: ^) J8 ^* A
  auto?           ;; whether or not this intersection will switch automatically.
) L( V) ?4 M/ ~- f$ O4 ~) J$ K6 y                  ;; false for non-intersection patches.
/ ^" }7 i- Z$ ]" b3 w: e; }9 K]* L# a% M! f& w
( j8 h* ?8 W. U% l8 i+ {

3 [6 B2 U- N- E' R; ]: d;;;;;;;;;;;;;;;;;;;;;;' I# E+ E  P$ Q/ q2 _
;; Setup Procedures ;;
, `/ B2 J* E, F;;;;;;;;;;;;;;;;;;;;;;/ p7 ~# }6 E9 C; r# L  E1 I

' @* K8 k8 ~  a5 G& O;; Initialize the display by giving the global and patch variables initial values.. E! v, c* _: P& C8 O5 I3 T# _4 o
;; Create num-cars of turtles if there are enough road patches for one turtle to% Z) T, ]1 `- \4 m& w" h
;; be created per road patch. Set up the plots.5 ?+ ]. r- A* m4 ~0 n
to setup
# Y) T" d& x- V  ca
& z5 d' X5 z1 i! h2 a# k$ n  setup-globals6 {: c* f5 V/ R1 k1 W# a
: z( m2 p. v  O4 d& }
  ;; First we ask the patches to draw themselves and set up a few variables5 ~( M+ r2 h. Y# V3 G8 d0 S9 A; v9 ~5 `
  setup-patches+ n8 p5 F: R: E2 K6 Y
  make-current one-of intersections
3 a" z! R6 A1 {- ^  label-current/ E+ [5 I  i3 f) w* b

7 }$ c- V* m$ [- ]) X  set-default-shape turtles "car"( ~6 R& H" X5 s+ ]8 T
' G8 }5 ?6 L' l( A9 U
  if (num-cars > count roads)
. g& _+ [/ C% _! L7 {) _- b  [
& ]2 e; _3 ]3 p3 \& G) x: S    user-message (word "There are too many cars for the amount of "7 Q$ O- z. W; `
                       "road.  Either increase the amount of roads "2 o' i$ p9 t9 ~) \
                       "by increasing the GRID-SIZE-X or "
- B7 P3 J1 v/ J                       "GRID-SIZE-Y sliders, or decrease the "
" d4 N: S% s- i                       "number of cars by lowering the NUMBER slider.\n"
* l8 E$ t- Z0 w  o5 c2 Y                       "The setup has stopped.")5 a, T( z) d5 \( I% _% B
    stop
* p4 @3 W5 s; h  ]  ]% Q# u' ~4 J5 ^3 P* E8 m

+ K8 u5 L, ]2 h, m3 O  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: h+ W' `0 L$ L. p( S. J9 m  crt num-cars9 g% ]2 |9 P7 H& r/ x+ B! S; l' A
  [
" w. J0 C8 Y! T! v' l    setup-cars* F' _1 y0 z' h' ~5 h
    set-car-color
( d- R6 j* a( j/ H( D( I    record-data
8 e8 f6 Z6 g/ x2 Q# i3 ?2 V  ]
  E5 ?: p# G6 ]* |3 r
2 n) E/ ~" J, b  ;; give the turtles an initial speed& L2 R: S! m' w; D4 y
  ask turtles [ set-car-speed ]
0 e/ `7 y: s- j3 `. q5 T
- \$ {+ k. K1 c, @  reset-ticks7 y+ x* K3 P/ H; l7 E$ D5 L
end1 p* N$ z# Z; Z: \/ H0 u! \  R

3 k) _: @" L! ]( i1 h! S: |: {;; Initialize the global variables to appropriate values$ ~. x$ S# E# ?( X5 M( w4 p' V
to setup-globals
$ V! P% P, {( Y  set current-light nobody ;; just for now, since there are no lights yet0 m  }% T  Z/ M/ M+ G
  set phase 0
) y1 ~2 ?) T% [& n/ {3 M8 m7 N4 W( S  set num-cars-stopped 0
! b" J4 {! Q5 {- ^0 O% W: Q5 v  set grid-x-inc world-width / grid-size-x
* @* \5 Q5 q4 |6 O3 c+ M7 x% F4 H  set grid-y-inc world-height / grid-size-y7 M1 ^5 ]+ P1 k* Y, M# M3 G

# n3 F1 `6 i0 D' d& K# ^  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( D; v4 w% ~$ |0 M  set acceleration 0.0997 n6 k; ?/ ]- D/ r+ f
end7 P( q6 [# _9 g( o+ P3 }9 i8 |
" t! `/ l# L) B. ]; R8 Q& y; W  u
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: l) u9 o& u9 Y
;; and initialize the traffic lights to one setting
2 \% J! {0 A$ O4 k  P% Z8 h7 G$ Cto setup-patches% K# Q, L  ], A
  ;; initialize the patch-owned variables and color the patches to a base-color
" r6 l8 m/ u# \5 B5 c* X  K  p  ask patches( K. ]; N) E; k% o/ y
  [4 ]( ^$ B; ~' b2 _7 K/ p
    set intersection? false6 c0 t0 N5 Q; p0 x  \" e2 F
    set auto? false
; M+ F1 P$ j7 h    set green-light-up? true0 i6 e9 ~( k: e0 g  _
    set my-row -1" r- f( w5 m$ l! ?
    set my-column -1
. U2 F' w0 g( a4 F5 s) }9 {    set my-phase -1
3 _/ R, @$ n5 N: S. j0 X  L    set pcolor brown + 3; ^" F3 n( e* x  H
  ]& |1 h8 R4 T" R% v) Z/ I+ z+ v

: m* b# Q. e, ~: A# ?  ;; initialize the global variables that hold patch agentsets
/ [( ^% R: e# J  set roads patches with  K9 I6 S4 H) t& P4 L' [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 b" [% U! Y( l+ w$ U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], k8 j, f9 w. O$ N; o
  set intersections roads with
  O1 P( A& T, t5 R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 M+ h: Q8 b8 U3 P+ u, M) C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, }% i  _; M# m) n5 c; J% Q# V( Q* X3 y, w# J
  ask roads [ set pcolor white ]8 q0 N) y% Z3 a, ^! s# \5 t
    setup-intersections
5 p% z6 J8 o% W& qend8 G' w- U& }0 D) F9 W' t/ g5 P
其中定义道路的句子,如下所示,是什么意思啊?
/ D8 O! \: k5 j4 e6 R0 c set roads patches with. M6 B2 \5 S2 h$ E' I0 ]" g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. w" u  q- W" I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 ]# c# {. ~3 F# |* D  V
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, 2026-6-16 10:23 , Processed in 0.016438 second(s), 14 queries .

Powered by Discuz! X3.4 Licensed

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表