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: 10253|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。
( r: a3 W$ B$ X2 U5 u6 M' s& rnetlogo自带的social science--traffic grid这一例子当中,  V8 n# I- a# o
globals
- J0 h5 w7 N2 A% |" z. I, {[9 U! m/ U; |4 r2 g  _# O
  grid-x-inc               ;; the amount of patches in between two roads in the x direction4 s& x" g9 f' `7 d* z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction. r8 W3 ?, r, K' y( i0 a& Q
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  d0 x2 r! \/ @$ k$ F" P
                           ;; it is to accelerate or decelerate/ b* @" Y9 [* q8 U2 `" |  T
  phase                    ;; keeps track of the phase2 H1 H$ O; E% g0 Z! b
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- @& W- G7 @8 y- y( ^
  current-light            ;; the currently selected light5 T# x( M" V1 s3 [

3 N  P/ D. x. z7 L1 U, c4 _+ T- I  ;; patch agentsets# O: j- \" t6 Z% U9 U. _
  intersections ;; agentset containing the patches that are intersections' L) M0 r; W3 f* B2 n7 D/ Y
  roads         ;; agentset containing the patches that are roads
/ s, |* v) y8 }9 @2 s]
& {& i" p+ N& O  A$ B" {0 h- D7 M1 q
2 T: R) O5 y' K9 nturtles-own
! H4 b- J! K1 m[/ m0 o4 T) D; N
  speed     ;; the speed of the turtle
3 C$ V8 Y9 r) l  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  D$ X3 y/ X; O; U: n( x* X  wait-time ;; the amount of time since the last time a turtle has moved
1 S6 o& A/ X; p9 Q0 K5 e' J]
/ l( _3 Y9 E" {
. b5 h# J4 J7 ]# ~6 I9 b- x/ Zpatches-own) q. z9 Q1 q  X6 b
[& w- t  t. T- ]& h( x
  intersection?   ;; true if the patch is at the intersection of two roads
2 c6 v) z& f2 |  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 x; Y8 \' ?5 L7 ~+ b% X                  ;; false for a non-intersection patches.6 Y* x" s! d, h
  my-row          ;; the row of the intersection counting from the upper left corner of the
  D, \& H+ ?6 z0 M/ g                  ;; world.  -1 for non-intersection patches.
3 M' V9 @8 o! I. W- s& x! O1 e) o2 ?  my-column       ;; the column of the intersection counting from the upper left corner of the
# M9 N; w" X% h$ b                  ;; world.  -1 for non-intersection patches.: k0 g$ U% s9 Y: G1 A
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
- k5 v/ A! h. U  auto?           ;; whether or not this intersection will switch automatically.
+ C4 O: I; x4 o# o. G1 K+ K' L2 U                  ;; false for non-intersection patches.- n8 b3 b6 ^. |9 Z0 ?, B+ d
]' i: |# C* d  \/ G& T" m

" Q4 }$ s. }6 G+ Q& G8 L& L% Y4 D; {' I, y/ Y  T9 }
;;;;;;;;;;;;;;;;;;;;;;  u0 V8 w" f+ O& p: ~" |9 b6 @& n
;; Setup Procedures ;;
" ]9 ?* J5 b  L& f;;;;;;;;;;;;;;;;;;;;;;- ^- f$ ~& X8 ^! [$ T/ ?

6 b- f! a, S% g! \;; Initialize the display by giving the global and patch variables initial values.4 k* r. K4 }* d3 T
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ j* M5 x8 X" p" U/ B3 \% c;; be created per road patch. Set up the plots.
" _! \1 Z7 o2 v6 g5 S0 kto setup
" Z+ C- H: `2 {5 u; ^' y6 ~' f  ca  T& D" {5 G+ e) S0 N2 E; c
  setup-globals0 k! }( _3 S% H  u9 U7 E
. |/ Q$ w2 j0 K, j- z) K1 E/ @( H
  ;; First we ask the patches to draw themselves and set up a few variables
6 T7 f& S5 n1 U! m# v8 `  setup-patches7 S' p, z4 M6 t( I$ x8 V+ D( w" S9 K
  make-current one-of intersections
3 T* r( e' s. A& b6 J! M, l0 C  label-current
$ E2 q4 l3 i2 a1 o
0 c& ^- O" y% d% A, T  set-default-shape turtles "car"" b' H' R9 Z. b9 t5 Z: E+ f
' y, O/ U) s# q; S
  if (num-cars > count roads)
1 w8 H, @3 N8 ]% [9 w0 j: c  [
/ M7 t5 ]% l6 t$ b/ B    user-message (word "There are too many cars for the amount of "8 t, b4 u# ~# |" e$ D
                       "road.  Either increase the amount of roads "% v9 i+ W# d' g
                       "by increasing the GRID-SIZE-X or ". z6 M/ Z! u& v
                       "GRID-SIZE-Y sliders, or decrease the "7 Q- i3 g; y4 \* }
                       "number of cars by lowering the NUMBER slider.\n"" p# X4 ?, l0 g0 l5 H
                       "The setup has stopped."); R' J2 x6 z9 J& o5 Y/ S' ]
    stop! |3 _$ ?6 q9 d5 F3 ~5 m
  ]
$ J3 I6 x* t4 ~4 u! s; }
5 v/ n: X/ ?+ ^& ~" X6 |% b  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( T" f4 u* v) ?) A
  crt num-cars( }5 u  h5 |( D, p) {" s  u
  [. z" o# ?/ x( G! T3 s4 k% z/ o
    setup-cars
' E+ d: B9 g- z7 i) K+ j    set-car-color, y* B7 T$ E2 n3 A
    record-data
- l: t( B' y! u" o7 ?' I2 y4 F  ]
# z7 y- J7 O% z! {" g- a) K% c( {+ m( g# Z: G' L' G
  ;; give the turtles an initial speed
- [2 U# X+ z" S  ask turtles [ set-car-speed ]# r. D+ i. y. i8 H
2 S* N% e9 Y+ u4 V) ?* j7 q6 s; A
  reset-ticks. B& s) X5 J4 }- |, _7 T' H
end4 Y$ }0 k. d9 W* C. D* ]0 J+ T2 C. m
$ ?0 F$ B, y$ e+ [" V% h& ~1 o0 Y' Z
;; Initialize the global variables to appropriate values
& b( Z. \6 U6 W. M4 Fto setup-globals
# t+ e" S3 U& ^) M; p- z( W# |% c  set current-light nobody ;; just for now, since there are no lights yet! ^) _5 _! _# N, W
  set phase 0
, W; `. A1 Y- ^  set num-cars-stopped 07 t$ H! G1 C  R( j) R
  set grid-x-inc world-width / grid-size-x' G  Y$ J' ^4 T6 o7 t) W
  set grid-y-inc world-height / grid-size-y& C( o6 D9 |8 _+ S  ^
& h/ }- Q) E2 F2 \
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 b! j, \, I- _9 \, W1 h" I, T
  set acceleration 0.099
! d7 [; N" T$ B: X2 E9 v* cend" G* V4 w9 c9 o
% N: l% n2 O+ ?. k$ F6 m+ g
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( y1 H; h, M0 \2 f- ?+ S4 o2 M9 y3 w! S
;; and initialize the traffic lights to one setting+ D( O! _" ^; C. L' B
to setup-patches5 [' U+ m" _7 A' l& b. P7 X
  ;; initialize the patch-owned variables and color the patches to a base-color
0 y  p6 g/ ~* n6 g  ask patches, n) o) c" G1 A2 U+ J% Z; [
  [5 u" Q2 s7 L+ h, y6 q
    set intersection? false+ `0 r: |" S" ^4 b+ x" g3 V( P
    set auto? false
" p+ U- ^# K* [; T; y4 W# V    set green-light-up? true8 r7 v% ~9 Z$ R
    set my-row -1
" E1 O/ h8 {3 I) c9 j    set my-column -1
: B/ p+ L' y6 S$ K- C. f' D  {    set my-phase -1
: d4 y" z- E* t# \9 E    set pcolor brown + 3# ]6 n# |! ]! r* _4 Z, ?
  ]
4 `5 o# Y! m4 w* N$ x( `+ W  U' F. i
  ;; initialize the global variables that hold patch agentsets8 B7 W7 S5 _# S9 T
  set roads patches with
1 w. d& X/ d; N( c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" ?5 I3 e" V6 u! L* k* K# |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, Y8 b/ O% }! V# \  set intersections roads with
1 `# Y( r* ?- c8 @' u) ^/ r" i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& ^/ S3 V4 h; ?2 R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 W$ R5 \: J4 q
# }' ]8 Q/ e, I7 q
  ask roads [ set pcolor white ]  s8 [: [" H. p6 W* }( d
    setup-intersections6 W  B) Q" v2 F7 ^9 b# M
end
9 L* B5 h% l1 y7 W/ F5 j其中定义道路的句子,如下所示,是什么意思啊?4 p% w' X  J- W# `- l
set roads patches with
, E. O; j! l% v; G" q& T3 e. i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 O9 ^( [9 K  g  z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' M3 b4 w' T+ Y1 x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, 2026-5-26 09:58 , Processed in 0.016847 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