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: 10578|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。
3 v! A' D0 J* V# a' l) z5 Dnetlogo自带的social science--traffic grid这一例子当中,1 k% P' j2 u2 @1 `$ q) M
globals3 v3 U4 g1 h+ B. M+ C. A% }" F6 l
[8 K1 `6 j. P8 b+ R8 b, }% `; C- m
  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 v4 C0 \4 J" L) n, k
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
3 z  {' j6 `' E  acceleration             ;; the constant that controls how much a car speeds up or slows down by if; B0 `/ h1 X: H; `
                           ;; it is to accelerate or decelerate1 M  }0 s6 r- w; p
  phase                    ;; keeps track of the phase
+ Y/ f+ L$ T) p6 d  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- H% u+ P1 T# b& ?# A! @! A
  current-light            ;; the currently selected light0 \7 w, t9 H2 P
. }% }; G, D: w7 G$ r) h) A
  ;; patch agentsets+ R$ H- q8 H0 S
  intersections ;; agentset containing the patches that are intersections
# J; d1 i# L# @8 q0 k7 ?  roads         ;; agentset containing the patches that are roads' V: S) }3 l& g7 U& V' m
]% ^% {! K- ?# p) R4 k; _7 }
) e' a( L7 |3 ~% @# Q
turtles-own( x" T. H2 q, A( _% J
[
, p, `: r$ _2 i3 P0 z* U  speed     ;; the speed of the turtle
3 p; W% Q" E# I. E8 r" r0 D  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
1 S9 Y5 m6 ^- Z; `  wait-time ;; the amount of time since the last time a turtle has moved2 k, C; R, U  x, X
]% q" n  D: u1 h& c% H

- {9 G+ H, Z8 Ypatches-own$ ]% K8 E; Q& X3 X7 f
[
' s, T; a% d" p) O& T% m  intersection?   ;; true if the patch is at the intersection of two roads% C, S8 n8 ^( X+ p6 k
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.7 B- o8 u( U1 ]- _4 Y
                  ;; false for a non-intersection patches.; u) c$ V8 x) m; N4 y+ h
  my-row          ;; the row of the intersection counting from the upper left corner of the
8 L+ `( W3 c6 j. @- h                  ;; world.  -1 for non-intersection patches.
/ R0 o3 l+ n: {# C% ~, l4 s  my-column       ;; the column of the intersection counting from the upper left corner of the
# Q: s% G7 f. J* D3 m, @/ L/ `                  ;; world.  -1 for non-intersection patches.0 O7 _' P3 m$ p& L, c2 O
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.% P( Q1 I# j9 y7 f7 @# c' O7 T
  auto?           ;; whether or not this intersection will switch automatically.1 V* i+ Z) }% X/ l
                  ;; false for non-intersection patches." b1 n- m0 n9 B5 A6 s' i+ P
]4 S7 u2 d' c( h, v( _7 ]9 C
- \9 l' [- _% n/ E

& ^/ T3 D2 f' N! V;;;;;;;;;;;;;;;;;;;;;;+ h8 [5 [) \4 u
;; Setup Procedures ;;
: G  M) C7 ?* q6 z8 b;;;;;;;;;;;;;;;;;;;;;;
0 Q: `% u; d* M' s! H8 Y2 ?8 Y6 ?4 A" b: K
;; Initialize the display by giving the global and patch variables initial values.) v% y6 c- Q/ f% i8 j: W
;; Create num-cars of turtles if there are enough road patches for one turtle to0 T3 O  F  c6 V
;; be created per road patch. Set up the plots.  `6 U5 ]2 ~* F$ _% Z3 }- j0 g6 j
to setup( A5 {: [) Q1 \5 h9 M! b
  ca
+ h. k- a! ]9 v5 c/ H' p) d  setup-globals
: D+ C0 o3 i- D" P& n4 J0 E9 ^! O+ m. |" M) N2 r2 f+ g
  ;; First we ask the patches to draw themselves and set up a few variables
0 e) S3 v. Y2 W  I" G* {  setup-patches
) f7 v% w$ r* l5 a0 o. H. A  make-current one-of intersections8 ~% A. K7 }9 [7 M
  label-current
5 p) e6 v: H# W
3 o( n0 _1 J5 L/ G* ^  set-default-shape turtles "car"! M/ n7 K& H% A) {7 L
3 L' G/ Q5 Z. j- |6 |
  if (num-cars > count roads)
4 v. ^" H) [4 l8 t$ ^, ?: x  [' Z. T2 J, m% a" M  }
    user-message (word "There are too many cars for the amount of "( w/ }1 R# O7 t& A/ ?% ?
                       "road.  Either increase the amount of roads "
0 C8 D, P7 @& a  q/ L6 k6 S                       "by increasing the GRID-SIZE-X or "
3 _2 Z! i5 x. C" R' L% z- j                       "GRID-SIZE-Y sliders, or decrease the "
: j* O7 [, v9 p) p" u$ A0 t                       "number of cars by lowering the NUMBER slider.\n"
0 O9 a. D4 }; R3 X, Q& t' `2 `                       "The setup has stopped.")
, Q+ `3 B: b( a& k    stop
- h: X) Q+ S9 j! m) G( D" q  ], m# ^: [9 V6 p! L: m  x1 p
* K) b. q4 Y6 X" M
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% b4 ]4 N) z% x. B+ `
  crt num-cars
5 t8 Z' U5 I: V7 a) B  [- [: U, H7 E/ P" V: t" B/ T* g& }: n
    setup-cars; L+ u' H2 J; X) z9 j* p
    set-car-color
- R& Z  ?' @! `& j* ]    record-data9 b2 x% g) k  K" c2 q- R
  ]
% z  k; _; q9 I' w! Y1 Y$ ?
3 |: y% B9 r7 ?/ R  ;; give the turtles an initial speed+ Y4 f  d" r  t0 }% k$ q6 v
  ask turtles [ set-car-speed ]' ^4 [( E2 X6 c/ V, {) V( k
- b" M( R7 }, {: k( I6 A
  reset-ticks
1 Q, n3 l! w2 o2 o# {end, R& o- R) S; i6 R  U  n

0 h5 k/ b* b9 w& i: w9 e/ P. j# W;; Initialize the global variables to appropriate values/ G! ]4 @  v( Q2 k
to setup-globals
) ^- V9 S5 W; K( R% [  set current-light nobody ;; just for now, since there are no lights yet
" c6 G! b. G9 [/ m& N& ~  set phase 02 w) d% ?/ s6 l, c
  set num-cars-stopped 00 i" W  M' E5 O; a" T3 V! @
  set grid-x-inc world-width / grid-size-x
- S, D- z; i) l  set grid-y-inc world-height / grid-size-y! M# O  r( b" r* t+ a" @" M' h  c
. r9 I  P0 b7 V# s
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( X$ ^! S/ \7 ^+ i; L
  set acceleration 0.099& Q" V* j; o3 ~" u
end
5 @' I: I, Z# p4 K' r6 \* d9 A, p- O5 Q: c) X
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, b# o3 [9 W5 z1 }5 w( A
;; and initialize the traffic lights to one setting
+ g5 u6 c3 R2 }7 f- p+ i1 B- U  R! [to setup-patches
9 c4 R" t# t6 A: m! l# R/ w  ;; initialize the patch-owned variables and color the patches to a base-color/ n4 ?. F  r1 G. F2 }
  ask patches1 L& M) S( ?; |3 {5 D
  [
- D* d8 n& W/ F: v# A( Z: P' o    set intersection? false/ |5 J% V1 M9 g7 |8 H
    set auto? false
* M- y9 _9 t6 W! d+ E8 o% K    set green-light-up? true: a, d; H9 ^: i& g
    set my-row -18 B" R. x; R8 p& Q9 p
    set my-column -1% o# H6 ^9 v* I: D5 d) z
    set my-phase -1
: U# _1 l, M5 j$ k5 M  b    set pcolor brown + 3
* }7 i: y  d: R  V4 h0 C  L  ]% `( w6 @, _- C1 W# ^: F

$ k$ l1 T& v  }4 ]  ;; initialize the global variables that hold patch agentsets
4 b7 Y" J' Q. {1 k- [2 Q7 Z  set roads patches with
2 v* B1 }7 M0 s3 y+ c$ M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) [7 {9 b, M* b( m- X. v& s% X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 r. G1 C: [  y" V# _  set intersections roads with$ @+ ]' C# v/ n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 r- v5 V0 r( ]+ U1 y) l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. Y+ j3 x8 h) |# ^4 z- q
: i: |, l& n  v2 x  ask roads [ set pcolor white ]1 k/ Z+ z" m3 D. f3 L5 R, }
    setup-intersections( x5 B5 U/ K% x  l& |2 \
end
! d4 D) @' U$ M# N4 G5 Z其中定义道路的句子,如下所示,是什么意思啊?
& Q% E  e2 G* r; k/ M& c  j! M set roads patches with
. |' q# u7 w# S  f5 _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' |& h6 P* d3 w& U3 q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: \1 q6 |9 W0 J( G; y- T% P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, 2026-6-14 19:04 , Processed in 0.014954 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