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: 7105|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。$ {. B, \/ S# `$ }, V
netlogo自带的social science--traffic grid这一例子当中,
2 i" n+ Y# j  x6 w+ Y: Eglobals
8 D8 H. ]; }7 J) i[9 }+ v% T" `( X7 o* f  `
  grid-x-inc               ;; the amount of patches in between two roads in the x direction* V7 y7 ?4 J( O* i
  grid-y-inc               ;; the amount of patches in between two roads in the y direction; F7 l, N. C, K9 f/ \: t. X
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if( Q1 x% W, E6 S
                           ;; it is to accelerate or decelerate# V/ Y  f4 ]& i  P8 i: g) t
  phase                    ;; keeps track of the phase
6 G3 |4 u, I$ J# p: B4 x  f5 Z  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ b. D6 z$ g* `2 y# g  current-light            ;; the currently selected light2 _1 l; W. Y4 @! q5 A7 u
" J9 ]$ \& y: J% d0 o
  ;; patch agentsets
! \* |, t5 b/ A6 Z  intersections ;; agentset containing the patches that are intersections
. H) |( ^& a3 ]$ ?  roads         ;; agentset containing the patches that are roads$ h+ ^) ?/ Y$ H3 C( L% q/ v+ ^
]$ o5 j! Z, _0 }( x2 T6 U2 B

$ }8 ~' G* [3 R& }5 \turtles-own: J2 r; R, ]( G. b1 t$ m. g# g
[: ~$ C  ~7 W! z2 r! e1 c
  speed     ;; the speed of the turtle* ?8 \2 `4 U5 D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
$ l) o1 p& Q: m" ~* g  wait-time ;; the amount of time since the last time a turtle has moved2 |8 b  w0 r/ X
]: o3 @8 H$ I: I* `4 K, }& o* w9 w

# ?; d# l* q7 g3 R  v9 Tpatches-own
! K2 ?% k3 z3 a" h7 J0 e7 U2 r[
7 l& U# R- Y& p! j0 n  intersection?   ;; true if the patch is at the intersection of two roads- r# z& l  v( E# U9 }
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.+ D3 C; F! |0 x. r
                  ;; false for a non-intersection patches.( G, c/ u6 \, h
  my-row          ;; the row of the intersection counting from the upper left corner of the+ b) M/ b0 q+ S! [" r7 w
                  ;; world.  -1 for non-intersection patches.0 I/ }/ p* |" O& G$ h
  my-column       ;; the column of the intersection counting from the upper left corner of the4 x, j% J8 N. K; @! ?/ o0 `) G; M
                  ;; world.  -1 for non-intersection patches.+ F  i6 E+ i$ ?8 K
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* a9 |7 n  B& F# z$ n% O
  auto?           ;; whether or not this intersection will switch automatically.
5 P4 K& c) a; ]. [4 C                  ;; false for non-intersection patches.) A7 v4 V3 k/ @1 D! Z
]7 P7 g- U# A8 L1 f& Q

3 P* ?/ M3 I4 V' }3 f6 v4 F) G6 G" s7 s4 o! ~
;;;;;;;;;;;;;;;;;;;;;;
: e' s% `# z4 H4 N9 o; p  C3 O! O) e;; Setup Procedures ;;
0 q( X8 ]/ I: k% |/ e5 i* ]1 _;;;;;;;;;;;;;;;;;;;;;;
) L; s8 X' ?; M, a) ?4 g
) f! i" v7 n2 q$ V! ?2 @9 F( T;; Initialize the display by giving the global and patch variables initial values.4 y/ e8 _- L1 l" W; W( ]
;; Create num-cars of turtles if there are enough road patches for one turtle to. Q2 q  G/ U: N2 s/ ^0 P% ~/ h
;; be created per road patch. Set up the plots./ l* u: D. I! r! ~
to setup, c7 }9 ^$ g+ @7 l) _
  ca
8 x; J5 F5 {. S: g4 p# e; k+ O6 {  setup-globals& {# {* H0 C8 v- v  y. ]
6 n" E" @3 ?0 ~3 ^. v
  ;; First we ask the patches to draw themselves and set up a few variables
" t9 s% ^; M4 _5 ^. j1 F  setup-patches- O# z3 [5 s  ?' b
  make-current one-of intersections- I9 h# g; D7 G1 e0 f+ t
  label-current
" G1 L7 \" g1 t, q. a
+ N& N% C" G+ o- K+ @8 \: U7 \9 T  set-default-shape turtles "car"
. D9 v/ i. F0 u* L: K* c1 F: f9 |% b  }, o7 G9 V8 F
  if (num-cars > count roads)
1 b4 t" `6 j- f9 p" N  [# r0 u7 i' \# t! r  b' o
    user-message (word "There are too many cars for the amount of "  u# ~3 ~6 E2 f/ p) p0 ~! V5 `0 `* q
                       "road.  Either increase the amount of roads "
8 z5 F, o, K! @6 @/ c. H+ K3 l                       "by increasing the GRID-SIZE-X or "3 r8 ?- U* _+ z# G: q3 Q% N+ K7 G
                       "GRID-SIZE-Y sliders, or decrease the "
/ O2 c9 j+ v! l+ V/ {2 o( q0 b                       "number of cars by lowering the NUMBER slider.\n"  Y" i; e) {' C5 }
                       "The setup has stopped.")
4 u" Q# C( a. a/ Z    stop
; D1 t: ^& C' h3 U  ]* {4 V% u3 g2 G7 {2 A

9 a3 R2 @! H4 Z, j- T9 U  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& R, e! x2 b, Z9 T
  crt num-cars: i4 w4 T) Q' C: U- _' |6 y
  [
, `0 I" d0 F/ K$ e    setup-cars
9 P" I1 ]- ~/ r8 T- m2 ^    set-car-color
. Z1 `' t% K  o3 m* t    record-data
- Z% ]" Q8 ~. t1 ^9 d) B  s  ]  c* n2 v% Y0 m, h$ A# q, u9 @

/ s# |, o8 z# e  ;; give the turtles an initial speed
0 b3 C; G" }) F) ]: S0 |  ask turtles [ set-car-speed ]$ q1 p! M8 }2 I

/ v5 G# j4 P: P  p  [- W  reset-ticks
& H" x  l9 {$ f) f  B4 _end4 S7 F7 o9 q: e) [

, r' q; r" r) d9 r) H+ A+ _;; Initialize the global variables to appropriate values
0 g; T) R$ |1 u+ g, E) pto setup-globals
% T' g7 ?' `( R* y! F1 N* x. F  @  set current-light nobody ;; just for now, since there are no lights yet# L8 Q# w  J  y7 T
  set phase 0
+ T5 u% g# g" f2 Z7 y/ t6 b  set num-cars-stopped 0% ^; n* N$ G7 P$ ^% w  ~5 l) e  W1 S* x
  set grid-x-inc world-width / grid-size-x$ f! h1 r0 W% S. [0 [, [
  set grid-y-inc world-height / grid-size-y
6 v& W/ e& K( d0 \- ]  O' L8 i% ~$ l
/ P2 t# r3 e0 n. b  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" b! \+ E3 ]5 V5 Y# I& g/ b
  set acceleration 0.099
6 n: R3 r  f: z7 f* Y4 W7 ]end4 i: W1 p; l% i, L1 |

& P9 D9 f6 O' ~% ~! Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
  z; a/ U; C- t! F# t;; and initialize the traffic lights to one setting
8 x9 D7 n% v& m- [to setup-patches
5 e1 v1 C! N" `. i" l* [. |  ;; initialize the patch-owned variables and color the patches to a base-color
: u& o$ h( X7 W0 p# M  ask patches
+ [1 t0 D& b6 `1 V$ J  [1 j* g( \1 Z# o! v4 p
    set intersection? false  r5 w1 r: K" ~9 e3 ]- {
    set auto? false
% i7 K9 w  q3 [, k4 ?5 n    set green-light-up? true
* b  s5 p6 k, b: K+ f    set my-row -1# C" g: [( G+ x) \) L
    set my-column -16 Y3 k; a$ f. T4 \0 k/ V, c- Q3 `" @
    set my-phase -1
4 Z$ ~* ]( L9 t2 e' ?" o    set pcolor brown + 3
# Z2 \+ Q+ S& D5 `1 W, k6 L% J  ]
( ^, ^# |$ D1 y/ N+ T* k2 W; c
( i3 ~; r* l1 T/ s  ;; initialize the global variables that hold patch agentsets) |, \5 c1 C" B( Z0 N; T2 t
  set roads patches with3 i8 c* |+ p8 u! \2 K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: l) n2 n8 m6 a( |: d4 ?+ b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: y+ B2 H( Z; a" F2 C7 i9 ~4 R  set intersections roads with1 [6 U( j: q3 }4 i5 f/ p4 {
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ w" a  v" w9 @9 H$ d- o/ h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 U; l! k! }( j; T" l3 @9 m' X
/ x8 b$ f( R, P! A# u5 O& k
  ask roads [ set pcolor white ]
8 n8 u$ V1 t  t2 a1 K5 Z    setup-intersections
+ H" _7 s' I" G  w5 A6 tend$ G  N& g9 J- y4 Y/ c' j! v9 v
其中定义道路的句子,如下所示,是什么意思啊?* G5 F, p3 n+ l- S! v. D/ o
set roads patches with  E! }4 f5 I( e! v$ n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 V, T6 Z* W/ u3 e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* d% B& ?* r) `
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, 2025-11-20 15:45 , Processed in 0.017636 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