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: 11093|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。, |# q9 H3 |" R% b4 N7 f
netlogo自带的social science--traffic grid这一例子当中," g. h: k: p& T$ s0 p6 |! n
globals& j; R! M; L; v+ q1 F4 `
[
8 O+ P. ~0 N- F, u: M  C  grid-x-inc               ;; the amount of patches in between two roads in the x direction
: k5 G8 i9 P' n% l  |  grid-y-inc               ;; the amount of patches in between two roads in the y direction
5 ~" C% @* L+ B4 d  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' }- T6 I: _$ q" U
                           ;; it is to accelerate or decelerate+ b6 C4 h, _% B: G3 t
  phase                    ;; keeps track of the phase) R; s# A* Q+ U" O
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ L. G% G4 d' J/ z% @! m  current-light            ;; the currently selected light/ n" H: a. |9 ]5 |

7 b. c  y: I3 z5 n4 t  ;; patch agentsets
% @& N1 O' m5 H7 l6 s3 C  Q2 |  intersections ;; agentset containing the patches that are intersections; a( `$ g# _3 R# b
  roads         ;; agentset containing the patches that are roads1 `+ ?, g5 b; ]2 s
]  f" N& [% N5 ]% p" B
% n5 n) p' V$ v; q: Y( p
turtles-own
7 v( F# J& `/ d& n( _* a# J[; K: @1 w& b; U0 q' l
  speed     ;; the speed of the turtle# s  Z7 S4 }8 L" T! {0 ^
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: l# [; b; s6 r) F: e
  wait-time ;; the amount of time since the last time a turtle has moved
7 F( S3 Q+ ?( q9 j$ F# c# m]+ Z( h! M, C5 U- ]  z! H1 s

& t+ t/ E4 ^  f: Y$ j& w( }patches-own6 x* O) L/ O2 I3 Q( O, D; k4 r
[
) A  _( d# N* a4 V$ |5 ?6 m  intersection?   ;; true if the patch is at the intersection of two roads
" _- N* H6 p7 D* m# g7 |& J; J  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
3 F% v9 l) {% o                  ;; false for a non-intersection patches.& x1 E2 i) ]8 R# e
  my-row          ;; the row of the intersection counting from the upper left corner of the) m) X0 [5 r% ^5 T7 D, U- H
                  ;; world.  -1 for non-intersection patches.& V% _# S, ]. j; Z
  my-column       ;; the column of the intersection counting from the upper left corner of the& C3 Y2 }1 b+ v) f8 t3 z
                  ;; world.  -1 for non-intersection patches.; C( h9 e' l5 d) Q2 J: Q
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.) F2 {4 L7 J% k$ O- T$ Q9 v/ U3 E
  auto?           ;; whether or not this intersection will switch automatically.6 x$ S# @1 [* k# y9 z/ L
                  ;; false for non-intersection patches.
3 M% D7 k7 C9 h  z8 }# r  n]
" E0 |( [3 `# p8 l; w  L! N, B+ V; V1 o) @

- T$ ?; p% a" \;;;;;;;;;;;;;;;;;;;;;;1 b5 J3 ^7 g/ E$ L  a0 e
;; Setup Procedures ;;( c  ^/ m! v' N9 Z
;;;;;;;;;;;;;;;;;;;;;;
2 V! \( R0 \9 C7 d$ M# ?3 F% q7 i& e0 }& L: E
;; Initialize the display by giving the global and patch variables initial values., J2 D+ I0 Q6 I' \8 `! `3 i
;; Create num-cars of turtles if there are enough road patches for one turtle to
! n' j; {% V4 B;; be created per road patch. Set up the plots.
( c3 x6 t' L/ G/ ^to setup
- \. k% N- t+ P+ U/ N8 H, ^  ca
( {& E% F) B' T4 I& e* D7 l+ I( y  setup-globals8 n4 s7 ?6 ?; v6 Q. T
& d6 R9 F& N8 e* i) b
  ;; First we ask the patches to draw themselves and set up a few variables9 ]  w# b$ t/ R. m' P9 ]& E
  setup-patches: b, H9 f' P' D# ^/ d: B: p
  make-current one-of intersections$ L' [8 @. ^3 Y5 I9 I
  label-current
# i; E0 M" H1 N% o" C% f" E" n0 s
  set-default-shape turtles "car"
0 s! M3 u. @* X& m( q" `5 i, P( f- R  `. C9 i$ m
  if (num-cars > count roads)7 N( b6 g$ w) r7 r
  [
$ e8 @3 i( n! f2 r    user-message (word "There are too many cars for the amount of "
, \$ B( o8 f) I9 b# v$ ]                       "road.  Either increase the amount of roads "
& e8 J* X4 Z3 v) s/ d* ~                       "by increasing the GRID-SIZE-X or ", N# s9 g9 W& b
                       "GRID-SIZE-Y sliders, or decrease the ". o) x( e0 Z& r: m
                       "number of cars by lowering the NUMBER slider.\n"
9 S7 ]7 F3 U3 q9 ?- D8 W. j                       "The setup has stopped.")
! y$ w; a: f1 J4 i" B    stop
: h& n3 W/ a2 B4 n5 o+ D. K  ]8 _6 V1 i* }7 M, x. T5 Y) D2 i2 [
) g% H7 C* M# Q
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* F1 D: w. k* E" F  }& R' s
  crt num-cars. O3 A1 L& _. ?5 A  r
  [
! O$ F, F- @/ L$ L# x    setup-cars; e, ?5 }8 D+ e$ z: ?$ ~
    set-car-color
& s8 L. m$ w+ b3 s+ r    record-data
! k" Q: g# e1 Z  c6 B  ], L0 G0 s  a+ i+ r! R. v

- x% c9 Y7 Q$ B  ;; give the turtles an initial speed
8 R0 [' |/ A% A) U# O9 N  N! H' j  ask turtles [ set-car-speed ]/ R3 G; O" V6 f6 E4 l- C' Q
1 D$ Y& m. k+ @+ x$ |- P5 c
  reset-ticks$ L9 |! n. m' P/ Z5 v+ ?7 |6 l
end
- f+ D/ I" h$ V- }6 z4 i$ O  }2 ]8 J$ D% M- C' ^8 N8 x3 t6 I
;; Initialize the global variables to appropriate values; G2 y/ ^6 P7 r2 T( X! W* A
to setup-globals
( D4 }. ^9 \6 i2 Z. t  set current-light nobody ;; just for now, since there are no lights yet
& v% p# n3 y( i  set phase 0
3 Z% O4 e$ h  M& W9 d' d/ {* u3 o3 [8 E  set num-cars-stopped 0
% \" v5 v! C: V3 M8 R% x: N  set grid-x-inc world-width / grid-size-x
' N/ W" U& S0 c; L% y* f& ?  set grid-y-inc world-height / grid-size-y
) n8 M8 V0 E) D  k" M
6 p8 h, g' u2 x. ?  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* u8 e7 Z# z8 @  set acceleration 0.099
! n1 C" Z7 k% `+ e2 G6 Oend
7 O, M) q+ A7 m$ f' W! V0 n+ Z
# j3 I4 k; t& v$ O- `- ]/ U( S;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& Q! s/ g) q+ e  {& D8 ~; G
;; and initialize the traffic lights to one setting1 m% [( a+ s# }9 S9 {& F
to setup-patches
6 n- p1 }4 j9 G2 j# r" n" y5 T8 W  ;; initialize the patch-owned variables and color the patches to a base-color
# N" v! A! o) I3 v6 A, M9 h. \. S  ask patches
- U, `& y! M& c' O7 m( D. Z/ W" D  [
: U, Y9 K7 b# g3 `    set intersection? false& {) A3 |1 f" O1 X# ?- p: ?* |
    set auto? false; p% E* {7 G! N7 h! C& Q& u3 L
    set green-light-up? true0 S' t3 p( Q2 {5 ^& D
    set my-row -1
5 f8 d6 `2 W$ c  b; |/ |" `    set my-column -1
" D( c! A$ c/ G% M: F1 E, A    set my-phase -1
/ m$ w% u" Z6 R& l; N2 R    set pcolor brown + 3
8 F* |0 K7 R- x: X( h7 u  ]
, `/ U; m/ h# s- Y" O! N' n+ p1 P. P% [
  ;; initialize the global variables that hold patch agentsets5 W- S' J& L9 T4 Y! G; j6 m
  set roads patches with
1 }# r% |) k/ k0 q& g6 ~* |  n5 G, e$ W    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ j* ^8 D( m; Y( Y) {" Q& y) v
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 S" h4 Q' L5 F, N+ B4 p" H' g
  set intersections roads with
: [2 {* I' Q! _6 J$ B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; Z7 B( W9 U+ m# K, Q: r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. L2 A3 G# q& r' x  {3 j
5 w- t7 L: E8 T6 V/ u
  ask roads [ set pcolor white ]( a  J2 K! P7 i* C" j% }
    setup-intersections+ |* r( H# N" m5 ]5 `1 {% _' ?0 q
end
* ]2 Y/ o- ^9 {$ W8 J; h其中定义道路的句子,如下所示,是什么意思啊?
; J/ H$ u/ \; \! g3 N/ `7 K set roads patches with
5 p/ W$ {; O3 `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- S, v- o  V! ~7 V! l7 ?" X6 a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; c& T3 d1 U+ h: O  \
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, 2026-7-14 11:43 , Processed in 0.015510 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