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: 7032|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。
, Y8 S# y! \' t, r5 t! [2 I& N& wnetlogo自带的social science--traffic grid这一例子当中,1 j1 o0 l. s0 l7 ~+ X
globals
( p4 P0 _* m$ a* O5 J5 }. @4 m+ s[0 t& ?" W$ l# r- ]+ C2 B6 |# L* P/ `* g
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ v+ i3 m9 X, i, p2 o) C' A  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 g- Y  b& O4 X2 s# R  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
, {  v8 H' r. b' O# `( o- ^. o  j                           ;; it is to accelerate or decelerate, x! E' W8 x: j
  phase                    ;; keeps track of the phase
( m6 h8 P! o0 W+ z# q. E- m4 ]7 Y  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- S: [: |% n; ?# U
  current-light            ;; the currently selected light
" G. x3 e  f. k1 h1 j8 R! T1 n* h$ e6 s
  ;; patch agentsets
9 {2 H+ M5 Y) M% N5 ^! n4 Z  intersections ;; agentset containing the patches that are intersections0 s# Z- J7 u4 {/ i3 @$ c$ G; e
  roads         ;; agentset containing the patches that are roads
" S! Z- X+ p6 _) D' n% _]
( j1 r  i$ a: a0 `( r
  Y8 i' P5 U! h# H! \; A( ^turtles-own
/ V# n, h' y) a- e$ R. v' r# U[
  b% f  a" z, T( B  speed     ;; the speed of the turtle
" I0 E5 B% q% ~; `4 T( J4 r  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
* l: [! ?4 l; Q7 F( q! o+ P  wait-time ;; the amount of time since the last time a turtle has moved5 i( ]- m" l7 ?! l5 j
]
! S4 Y  Z9 p( n8 e
. W1 C, j3 s& O" i" b( l, Upatches-own- M+ E( P# F2 |# M1 C" V7 K0 l3 J. i
[
4 J: C1 ~7 V9 n6 u; I0 x  intersection?   ;; true if the patch is at the intersection of two roads/ {! L  G( u+ X# @0 W! M3 I
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! h* k' e1 P) N: @% P5 J1 j                  ;; false for a non-intersection patches.
6 v' O, s# h( V  my-row          ;; the row of the intersection counting from the upper left corner of the& R( W) t5 M4 _7 [6 E
                  ;; world.  -1 for non-intersection patches.
3 @. B, o( E* u1 Y9 u2 ]: C  my-column       ;; the column of the intersection counting from the upper left corner of the
+ n; v& r  H. Z                  ;; world.  -1 for non-intersection patches.
5 u: Q! T1 Y( }/ ]+ [9 f  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.) ?- h  d7 E5 q( Y! z. j* V& K6 S* e8 L
  auto?           ;; whether or not this intersection will switch automatically.
$ C- v, S) W" B" ]5 U$ ^$ Z/ m                  ;; false for non-intersection patches.  d% g9 y& ?3 t- @- V
]
# @6 o# u' i  I' t$ Q: j: }, O
/ b+ L; L- ]! f
  b! B2 ]% N0 `, A;;;;;;;;;;;;;;;;;;;;;;
5 k' i) ~# a* z) F;; Setup Procedures ;;- n- Z) W' u" I4 T0 Z/ f. g
;;;;;;;;;;;;;;;;;;;;;;
. @' v6 C# j. L0 P, @4 J4 a6 K, u
: R1 Z# g: `, m" o* u" ~$ M;; Initialize the display by giving the global and patch variables initial values.
: j0 i# W2 v. J" g;; Create num-cars of turtles if there are enough road patches for one turtle to+ G! h: D/ g: C1 l0 S4 T
;; be created per road patch. Set up the plots.
, _9 s" m7 V% D' A9 y) v1 n- L# {! \8 Lto setup
; A7 P: u) f, R. i& E  ca2 x  n! [8 D& n. v7 @" Y& x  g
  setup-globals
3 @8 E3 t7 n5 A4 z) E6 m9 U, J3 a( J
  ;; First we ask the patches to draw themselves and set up a few variables: Q$ k6 Q8 p7 l, u! e+ R; S
  setup-patches& E6 v# I/ C. V8 k3 |7 m
  make-current one-of intersections4 ~) V: r! k7 J; ?9 w1 A- V! ?+ l
  label-current7 r# ?! \( ~2 g1 X

, L/ @% C/ r) V9 K1 K) n  f  set-default-shape turtles "car"7 M& f3 U4 m0 F& g

- B/ L' v7 i2 m* B6 |) W. Z) I  if (num-cars > count roads)2 l3 h7 y! _: U$ A( J7 [4 z
  [
* P( H: X5 s3 o7 J* `* b    user-message (word "There are too many cars for the amount of ": ?+ H: o  q7 U/ U% P
                       "road.  Either increase the amount of roads "
) h% }& b& a; \                       "by increasing the GRID-SIZE-X or "! a& H9 l# R! y# Q, C7 l6 h
                       "GRID-SIZE-Y sliders, or decrease the "4 f4 A& Y5 K# _7 Z1 i' \
                       "number of cars by lowering the NUMBER slider.\n"
& k1 N5 E  w( U7 b/ A                       "The setup has stopped.")
& a! ^+ Q" s+ M, |! s7 f    stop8 W% E. Q( H0 P/ d
  ]
: [+ V1 u3 p: A
8 o0 w. H+ h1 y  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; ]7 J) o0 ^/ b3 b
  crt num-cars3 g3 F+ d, r/ l% B
  [
& D) T) O% P1 N/ H1 b6 T: J    setup-cars
, ?/ S  r& Q0 g' \    set-car-color. K% R" J2 w0 f* D
    record-data% Q; c: }' i- _0 ~3 W: d) f1 {1 B1 E
  ]2 e3 P' q$ R0 A& I4 `; O

, ?/ d" X5 c7 `" Q9 G+ ?! R$ }  ;; give the turtles an initial speed7 C8 x5 r- z2 x4 V6 {, M
  ask turtles [ set-car-speed ]
; ~& R9 p9 O! k$ q  [( T; u3 X. }3 t# w% Q: G" }
  reset-ticks
/ O4 e1 |! w) y: zend. x3 t$ p" L; x) C" Y& C
4 h: `" v: r, t/ U1 U. [
;; Initialize the global variables to appropriate values) b5 V$ D8 ?  x$ F/ ]. G$ V4 d8 r  g
to setup-globals
+ G4 _2 U1 [6 E  set current-light nobody ;; just for now, since there are no lights yet
; D+ r) t. M/ R: \3 ~: y  set phase 0
* }3 h( W$ ^& o  set num-cars-stopped 0
& R1 Q2 o5 f) ~" b  set grid-x-inc world-width / grid-size-x% `2 |( W- ]$ b4 l& t" k
  set grid-y-inc world-height / grid-size-y8 O  F2 w# P& x, l: N; x0 Q  [# J

% X! e* ~7 z. V  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 b9 @& q: O" I- p# U' r
  set acceleration 0.099
: d0 \1 s/ t* _4 |2 yend/ p* a" O! E1 J. _
2 ?4 \8 [2 g* D' }, d' b$ _
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 g$ [' w# m3 S1 W5 M;; and initialize the traffic lights to one setting
1 @) w& g6 L, e$ S' F5 w9 Ato setup-patches6 n# A) x% N# B4 u
  ;; initialize the patch-owned variables and color the patches to a base-color4 t( ^& ^8 P( R4 g; d
  ask patches
0 ?& E' I, ^! b$ F8 Q9 f2 r  [% m  y* b/ a# D/ n* U/ J7 m. |
    set intersection? false0 q( e- h6 p5 a9 W% ?
    set auto? false
) ~! N0 [: A, D- f" u/ \# m    set green-light-up? true0 B3 {. N& b6 f9 U1 O: U/ q
    set my-row -1
1 `; @5 w8 H0 B( ~* ]! d    set my-column -1& t9 T" M- r, t8 e" O3 j
    set my-phase -15 U+ f7 I$ c9 L: H+ U2 }7 n3 n4 m3 B
    set pcolor brown + 3% J" {# z* \4 i5 G6 l
  ]5 w' d% B# U- g! r. F" J

0 ]1 Q  g% u+ P  ;; initialize the global variables that hold patch agentsets9 k$ ~+ H, K0 D1 F5 `5 T
  set roads patches with; }+ H) o1 L  l" A2 p
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 ?9 Z& _) c6 G, I: \$ D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( y# y" M- }% e: H- x" A3 _# g  set intersections roads with
- r% ?# M. ?$ H2 _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' ^" p" j0 j) ~  J2 G+ W2 V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* m/ f$ \1 H1 m* y$ n

  A$ f$ N1 `5 c/ E$ o; u  ask roads [ set pcolor white ]
: x3 Y# u  ^- U, U5 z( r6 E    setup-intersections
, R( y$ \3 b- H" jend
8 p, E& h1 B* l( i" r$ S0 g其中定义道路的句子,如下所示,是什么意思啊?! J. i$ {% l4 K/ }
set roads patches with
4 i2 t6 E8 b. B. Z- K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ h: |/ g6 h/ L$ E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], R# T8 V0 N1 o- h' \3 V" C+ h
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, 2025-11-14 16:00 , Processed in 0.015506 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