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: 6292|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。
4 K- H, x  |) {7 t) P$ qnetlogo自带的social science--traffic grid这一例子当中,$ }& {! d4 n2 N# ]& a
globals
+ ]4 z% w: H+ _4 Y. W1 G. n[
8 {7 ?. m/ W3 E, i6 u, _3 g  grid-x-inc               ;; the amount of patches in between two roads in the x direction8 c6 V* \. Y8 ^0 c  G  T7 c0 b3 c9 q8 n
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
7 [: \  P8 J1 t8 t5 y+ X4 r  acceleration             ;; the constant that controls how much a car speeds up or slows down by if8 X3 z. _# f( A; z; E* T% U
                           ;; it is to accelerate or decelerate
$ K$ D" ?- u8 T6 E: l  phase                    ;; keeps track of the phase
2 X; f( d0 _: s" i8 u, z  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 H7 \9 O) ~* v! U: v: V
  current-light            ;; the currently selected light3 u: _. j% ]6 {! W5 K- e7 s2 C
& x! a, |5 l4 l  ^
  ;; patch agentsets
' C: J2 k: R9 v% _2 Z6 m  intersections ;; agentset containing the patches that are intersections0 Z7 C! @. Z% @& [6 u9 J/ Q
  roads         ;; agentset containing the patches that are roads
, |* ?4 f0 k' x2 S9 L% G; X; _: D]
8 V- ~, H8 E  U1 x0 O
5 ^* d( s+ f& I9 G5 Xturtles-own
7 E, t7 Y& ], A9 Z# B! r) M[
3 J. k% j( A+ @( X/ I  speed     ;; the speed of the turtle- o6 d% D2 u  h9 {. v
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
% M9 [/ A8 c4 Y  g; n  wait-time ;; the amount of time since the last time a turtle has moved7 Q& l: Q: Y' d6 J7 T% C
]
6 z3 M9 A5 N" V) J( R9 J
. S7 ^$ `; E( N* A+ b# q4 Apatches-own
. n/ p6 G' O3 l6 W- }: |[+ Z. u% x% _" W7 C0 k# A& ]
  intersection?   ;; true if the patch is at the intersection of two roads+ }- O" f3 l+ ?. q! \9 \
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 o6 n( p0 A9 }/ A' @                  ;; false for a non-intersection patches.4 x' _0 K4 l/ l7 O* f; `- W) p
  my-row          ;; the row of the intersection counting from the upper left corner of the& h3 C4 c0 K0 |
                  ;; world.  -1 for non-intersection patches.
! ^9 }& N0 V2 [5 L- o  my-column       ;; the column of the intersection counting from the upper left corner of the3 y/ ^5 k6 f! V9 C
                  ;; world.  -1 for non-intersection patches.1 |3 y& r5 g6 Q
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.) a- R8 r. h/ O" q7 H+ N( V
  auto?           ;; whether or not this intersection will switch automatically.
. V8 g9 k  Y9 J1 B                  ;; false for non-intersection patches.
4 C9 i- J- s& v8 c4 M+ |0 R]) z+ m8 C6 S( N) [4 `4 t
* ?7 f* w2 Q* \6 [
+ i0 E+ e. Z8 N8 a) i2 J3 U
;;;;;;;;;;;;;;;;;;;;;;
, M* ^1 m: m% B;; Setup Procedures ;;* {$ E: O! Z; c- u# X
;;;;;;;;;;;;;;;;;;;;;;1 U( S% _. `: y$ z( c& ]( H

5 U; i' V/ n( \, r$ k;; Initialize the display by giving the global and patch variables initial values.  W% b. Z% v. |3 `. H2 `5 r
;; Create num-cars of turtles if there are enough road patches for one turtle to9 D" z0 y. S5 v4 z
;; be created per road patch. Set up the plots.: Q. h4 d" h! A0 {
to setup
' N  [/ R1 G' B4 a+ J7 G' e9 m  ca2 p" Z. w" \) ?6 F  O
  setup-globals
0 {! M" y+ r: k8 p6 [
/ n9 a, s% K) D4 f0 y  ;; First we ask the patches to draw themselves and set up a few variables
* H0 z4 g$ m+ u8 K8 K  setup-patches& V- c2 ]8 j8 Q, j4 `) p8 T
  make-current one-of intersections- ~. ?4 D+ {+ Y! b/ x8 H
  label-current5 W5 Y9 t3 c& O

+ S8 X- G3 J# }/ U  set-default-shape turtles "car"  A( q- P1 F& D4 X. o! r

- F( A' G" G8 Y! M# [  if (num-cars > count roads)
" g2 e, d* I1 Q: Q* ^. {- Q. {  [+ N2 L  r, r2 `6 W' \6 ?2 l
    user-message (word "There are too many cars for the amount of "
7 D8 ~' q( R4 b; H                       "road.  Either increase the amount of roads "
9 n/ j# @& n( Z0 W: J' E                       "by increasing the GRID-SIZE-X or "- Z- Z  X* Y0 x3 b, Y  @
                       "GRID-SIZE-Y sliders, or decrease the "8 p% ~# c5 j3 f3 c
                       "number of cars by lowering the NUMBER slider.\n"; P3 p! g! w$ T% s0 C" I
                       "The setup has stopped.")
9 e0 [& A' T3 Z' T1 c5 {  W* Z    stop
0 \' c) B! a0 B  ]9 S' Z1 ?; P) A' q( R( c" G& w
, b! `0 E: }+ n8 ]4 U
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 A& V( O& x' t0 j9 A  crt num-cars5 c  ~( T9 |. q4 @, H& b; E
  [
; C1 l# ^1 K  _" ?    setup-cars7 e$ |; ]7 [  J. U
    set-car-color
& P5 G0 ]: w  F( w    record-data: p- y; i, B, C- n% X9 U
  ]
' r5 r% U/ p# O$ C
% q3 A- k- t. b$ Q1 i7 s6 o# f  ;; give the turtles an initial speed
' _4 u! z% i2 u1 i  ask turtles [ set-car-speed ]
1 z2 D. c0 h0 A  g; J" t% D; X7 d
3 P# y- ^5 `/ h. W! q  reset-ticks
' P- }4 I6 m# L( r2 }8 hend- K# W( f) C/ E0 d; w
5 L. k+ v. A! z+ ?7 i0 Z, {
;; Initialize the global variables to appropriate values
4 v! H( h- `8 d; ?+ qto setup-globals
8 q0 }* o. o+ [; g4 q& X  set current-light nobody ;; just for now, since there are no lights yet
0 s4 c; g9 P/ p  T& }/ m! M% p  set phase 0$ D, a: u6 ]7 @% X
  set num-cars-stopped 0
4 E( w5 c0 V0 C- H8 i0 Z: Z  set grid-x-inc world-width / grid-size-x
2 i) a! s4 u" X$ ?  set grid-y-inc world-height / grid-size-y4 k2 z" t. v, K0 H# y
/ }; D" L) l  w- _
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 z9 C( V2 W  ?" D" f  t- F  set acceleration 0.099
' Q" n. @- h# t6 B( v1 wend
1 ?& C- r7 C; K. e5 N/ L' [& s) d/ s' K# Z6 A: ^) T- Q* q3 W
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 h0 B% p1 {% c1 ^;; and initialize the traffic lights to one setting4 [1 O7 L8 u8 c
to setup-patches5 Y3 q1 t* h9 H9 @
  ;; initialize the patch-owned variables and color the patches to a base-color
; ~( A+ J  V3 ]$ i6 ~0 K  ask patches
( T! }& n) t8 v+ a0 K  [4 P. S) G# P  K. r6 D" S
    set intersection? false
' l( B7 ~" h% s8 m$ s! s    set auto? false; r- \; `+ X: M3 Z
    set green-light-up? true: {( |/ c3 x" T3 y3 C+ f
    set my-row -1
0 m' p7 W8 e! V6 V  q1 z    set my-column -1
- [9 M7 `) a4 n! ?- T% V0 Y    set my-phase -1' q4 W$ N5 @% t; u
    set pcolor brown + 3: I5 s  l% h- g* T5 |; m% a
  ]
* a; ]) F: K5 U
5 ]# U# t3 ]* F+ W' Q! c+ h1 a, W  ;; initialize the global variables that hold patch agentsets
; Q9 g2 T8 r0 [! Z$ `, k! [0 _  set roads patches with
0 y% j5 V) x8 u/ I8 c* p9 x5 g% V6 |    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' q  g" G5 O  D/ [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 m7 N- E$ ^; v4 t" i6 I  set intersections roads with
2 a5 Y! h, o3 G! x" k) P8 F2 g: a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! F  ~( t- w/ a7 K7 l, O6 v; U: o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ |+ z( K, n$ u6 G# r3 R* j* ~; f* j# F* A) A3 g
  ask roads [ set pcolor white ]- b: c/ @9 m" X! |
    setup-intersections- z2 F3 y9 l5 U, o
end7 M$ [7 q% C2 h5 w* k  i
其中定义道路的句子,如下所示,是什么意思啊?; w6 S3 X( y$ E6 M" {  [2 N6 }# F5 q
set roads patches with" d$ M4 R0 l7 j# m: h  c9 @. Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. t% O2 G8 N0 Z2 Q5 S5 ]9 b
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' b* k6 C' x% M
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, 2025-7-1 07:25 , Processed in 0.011767 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