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: 10881|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 L, e" J+ |& f
netlogo自带的social science--traffic grid这一例子当中,7 k  K" M8 Q/ l- E3 P! B& d
globals
: s+ _, o6 L$ N2 z[
3 ~0 ]6 g% N+ d5 e, {  _  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 E# `4 i2 |7 @$ f  E* A  u9 R  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( [9 ~: W5 c$ |# f$ _' l  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
5 f6 u: l$ j0 h                           ;; it is to accelerate or decelerate
# ^6 g0 N! |( ?  phase                    ;; keeps track of the phase
  Z9 O4 L# K3 R- [) B. F/ B& |& ~  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure# l2 l9 b2 D/ r8 A% c) A
  current-light            ;; the currently selected light6 I# _$ Q& ?/ X- j  D! L* z  m) }3 u! X

1 R2 c9 w5 g$ _% p  ;; patch agentsets
9 d4 H3 X2 {6 R) C: v  intersections ;; agentset containing the patches that are intersections& z3 @7 ~3 B( y" J# M) Z: E
  roads         ;; agentset containing the patches that are roads' w- L: W* e) f  d7 _5 U) e& S
]
; S4 z7 i5 c  X) L4 J; W) o1 {* w2 o3 f8 N; |
turtles-own
; R6 g* N* o3 c8 F  G[, X! G( o8 |6 d1 k  M  y1 z
  speed     ;; the speed of the turtle- u+ v+ x# k# t% `& Y( h0 S
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. Y" q; b& T/ X# e! u  wait-time ;; the amount of time since the last time a turtle has moved  H7 V; k( `3 u. s: O  `
]
5 M$ e* ?8 X: G, F. O* N3 j5 R  t% r5 j! Y# w. m
patches-own
) {/ `7 r, O4 J+ K8 k% B5 I6 c/ p3 ?[
  R) N* @! J, L5 N" o& r  intersection?   ;; true if the patch is at the intersection of two roads
* U0 A! u8 w6 v" ]2 V# i5 h! D0 d# |  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
( ^7 d5 k, `& d- O' u: s* b* ?                  ;; false for a non-intersection patches.8 o2 Q, J+ Y  a3 q, B* K
  my-row          ;; the row of the intersection counting from the upper left corner of the
, x) h2 F7 g  a2 Z. H7 x% N5 K                  ;; world.  -1 for non-intersection patches.; I# I2 t6 X$ W5 V/ o
  my-column       ;; the column of the intersection counting from the upper left corner of the' h, S0 h' w, Q8 z
                  ;; world.  -1 for non-intersection patches., Q2 O5 Q0 Z/ e+ E9 i
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
8 v! |: V9 `& ?6 O" e; A" R  auto?           ;; whether or not this intersection will switch automatically.! ~7 B& q: O7 g7 k* R* \
                  ;; false for non-intersection patches.4 c0 Z7 a. X2 h8 Q. V6 I( B
]6 b. T) ^( W1 A5 ^) r

, @0 q5 I  e6 v8 c. z) \$ f7 ~$ J* A4 @8 m9 a% d1 N; v5 l5 S2 ?
;;;;;;;;;;;;;;;;;;;;;;5 _# B: m1 e: u# I4 e
;; Setup Procedures ;;7 {2 d1 _$ w- J, n0 }- S
;;;;;;;;;;;;;;;;;;;;;;
5 b! R: @7 v: ]: t! p- J6 y4 y! C' i; _
;; Initialize the display by giving the global and patch variables initial values.
0 I' E+ K( `, y. C- R5 };; Create num-cars of turtles if there are enough road patches for one turtle to7 O' _* j" v* ], M# ~
;; be created per road patch. Set up the plots.
: u4 h  }' L4 {* X" l1 C  S9 Dto setup& H( F4 X* \! X6 \7 u) e/ r
  ca
& _# a( ~7 e3 C9 t! y) R- y  setup-globals
$ F( }( q* Q' g. A/ l. y
) ^/ A8 [7 i% F6 E  ;; First we ask the patches to draw themselves and set up a few variables
4 Z: j  A+ F! H5 b9 I7 q- \! P; w  setup-patches) G: D2 @. E) }9 Q& ], H9 E
  make-current one-of intersections* Q+ ~% u* _3 Y
  label-current
' v4 B8 [8 N# }* s* L0 L" e# C
5 y; d- n" {7 m2 X4 Y- w  set-default-shape turtles "car"! V; }- o- d8 C0 x

& R+ L4 m/ [7 `; k* R- K  if (num-cars > count roads)! p( ^7 ]3 C2 Z+ J  t2 t/ r( D
  [, u% h* q& ?6 {+ a# D) f
    user-message (word "There are too many cars for the amount of ": [2 l* z. p9 B9 X' t! R: C
                       "road.  Either increase the amount of roads "8 H  J* O8 D# g1 Q; b0 c
                       "by increasing the GRID-SIZE-X or "
" q8 U  Z  J2 L5 `* m( A& h& c                       "GRID-SIZE-Y sliders, or decrease the "
, Q+ m6 W  s& f8 N$ C                       "number of cars by lowering the NUMBER slider.\n"
* e4 |1 t; X" i) Z. x  o/ @1 O* J                       "The setup has stopped.")
4 _0 W1 T$ n. }8 w" Q    stop
3 j3 X: v. A  s. u2 N$ \9 v  ]
- I6 Y! q: S" [# m: _% {& _$ C& Y: y' X7 b" _1 R3 o
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 D+ }7 ]+ z- D$ \9 t  crt num-cars
+ J/ F! k! q$ a1 d  [! M: \- m1 W3 N1 D: V. D
    setup-cars
, Y8 _) ~. `9 t  U& Q' ?    set-car-color
" @. s% K7 ^5 y3 w    record-data
1 [0 F; y& U2 @" S4 H/ n& R  ]
/ c5 L- b/ O. r8 H( v) E6 Y! M+ I5 g" K. ]
  ;; give the turtles an initial speed* Y& \: B: C; z5 P: {
  ask turtles [ set-car-speed ]; _) v, k+ N  t5 ?  @2 P8 n
% _/ ^1 Z0 |' c9 s1 E& ]
  reset-ticks
' T) B/ ?4 i  e) Yend
5 F7 o# J* T. b/ J' y& ~9 C
+ @7 P) A( @0 g; g2 F, d;; Initialize the global variables to appropriate values. q& F1 Z8 S  h- ^
to setup-globals
& c- O! k/ @) B  set current-light nobody ;; just for now, since there are no lights yet0 C5 d: f3 ?. [6 e5 Z+ x1 S5 F% v
  set phase 0$ H+ v; C$ w- F! o: O5 V
  set num-cars-stopped 0' K/ O9 H# y  V7 d7 |* t' O
  set grid-x-inc world-width / grid-size-x0 ~7 [1 ~9 r$ u# |  g
  set grid-y-inc world-height / grid-size-y
8 _9 o: K1 ^4 Q- a0 F- v
3 l$ m' F/ B$ E* P5 \. S  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 c. Q/ Q+ Y* G+ G: K
  set acceleration 0.0991 h4 l. x+ ]" o( Z9 \/ A0 t
end3 ^. _- Y$ m) ^2 r/ H0 B

3 C# f  {1 O+ m' e) N7 a;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 E6 j  u" T! \7 E( a
;; and initialize the traffic lights to one setting, y9 X8 Q0 m# \6 c' Y2 \
to setup-patches- r& y* N+ W6 x% c9 q/ ?
  ;; initialize the patch-owned variables and color the patches to a base-color$ b" @* v  d% a; G8 {% D7 N
  ask patches$ x6 L' J' k& m* p, {8 s
  [
8 o( d: s* ^  g1 Y$ D    set intersection? false7 d2 k7 W! L6 f) d" Q$ j% P
    set auto? false
5 f: f% c4 _. h. r2 \3 X6 G    set green-light-up? true
7 }. u2 ]* o- r/ b5 ]* O    set my-row -10 ~# I0 [$ U/ Y+ A( x5 {
    set my-column -1
; I$ Z" k7 S9 k( o7 }, S$ `    set my-phase -12 u1 _. `/ a% e4 l( u4 L3 v
    set pcolor brown + 3
0 Q5 F! ]+ f. `: X, w  ]
7 D6 D% f" d9 y' _/ v2 Q* B! C8 m0 q! b3 R, \
  ;; initialize the global variables that hold patch agentsets( K' b5 m/ w# \( @! Y* P" s0 ~. w
  set roads patches with
* V+ T3 j$ X: t0 N% u% {6 }* t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# U( ?9 N# o$ j, \# q/ D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* _% `3 ~# @$ ~: Q9 `$ l6 ^. f
  set intersections roads with
9 i; C/ Z8 P/ o  m) {    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ v  f! W/ s, i' s6 o- k
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 I' `' E& L  @4 l$ j% H: ]* q3 O
7 ?* q- Y) p% A: @  ask roads [ set pcolor white ]
4 H0 H) v* Y9 u! x& H    setup-intersections
" e* ]; X: }4 ~/ ]" pend
% k9 B4 ~+ C1 H$ f( N- ?其中定义道路的句子,如下所示,是什么意思啊?
7 j/ v- w2 V' X set roads patches with" N- g8 y; F4 o4 v: i; |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* e& M, C9 U; i# t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ |0 P7 ?: E3 ]$ 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, 2026-7-2 10:51 , Processed in 0.011919 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