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: 7912|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。5 A1 q- Y5 V) \! h$ Z' s% T
netlogo自带的social science--traffic grid这一例子当中,- r4 z: a6 u8 x3 {2 T/ p5 f
globals: ]1 M! c0 U$ @1 c
[
  E6 d' C  ~( s' Q  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 f# p1 e  p% e' p# p  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& H& x2 w5 b6 B. H: `, o- M  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# `/ S/ c4 e8 \: Z: y
                           ;; it is to accelerate or decelerate
% P4 E. u# X& s7 w1 Z4 Y/ T1 Q  phase                    ;; keeps track of the phase4 n) h5 \+ V1 y0 `, p
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; R4 U4 d0 ]$ r# J9 V$ d+ t5 q
  current-light            ;; the currently selected light
7 H. ]- B+ I5 |2 }; l! s) {5 P) @- f7 E4 m* O. U
  ;; patch agentsets
7 W/ j: h" `& L& |9 r' b# P  intersections ;; agentset containing the patches that are intersections
( g* |/ A3 K& Z* I  r! f  roads         ;; agentset containing the patches that are roads( y8 S: @7 o6 I3 S' k
]
% Z/ E6 b/ w) j/ ^
8 u  P& [+ P- O- Z2 Lturtles-own
0 A  ]  n' o$ {( F, F[4 f( ]9 O3 R: z- ~( W0 s3 K/ }
  speed     ;; the speed of the turtle
- c# Q* }. G6 W3 H  u4 b) ~1 [( y  up-car?   ;; true if the turtle moves downwards and false if it moves to the right$ F7 y) {; b" I
  wait-time ;; the amount of time since the last time a turtle has moved' ^7 x9 T# h' d% Y
]
! C0 I! M! F$ `) n7 l- y. t
* U' `4 f1 H4 q0 C8 i  a3 ^% G+ z6 Kpatches-own4 y: }6 d; m6 u3 P/ `
[
; h4 |; P+ z5 ], N9 N* }7 T- [3 P  intersection?   ;; true if the patch is at the intersection of two roads9 F: M% B& R! y4 C, C- @, }
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  d2 N- {! n0 Y1 y* A8 Z                  ;; false for a non-intersection patches.
( x% I; r( A7 r8 J2 Z9 ]  my-row          ;; the row of the intersection counting from the upper left corner of the
- Y' a. X% T" I. _, A                  ;; world.  -1 for non-intersection patches.
- }% I2 S6 x2 F% b  my-column       ;; the column of the intersection counting from the upper left corner of the
. g+ o' ~6 q9 b2 [* z0 E) E                  ;; world.  -1 for non-intersection patches.
7 w, [) E" `0 p, R- S, T+ ?; `! O9 R  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
( n% l4 i0 U: J8 x1 o' _" r  auto?           ;; whether or not this intersection will switch automatically.
+ J* S7 U! Z, @* U2 {' u& K                  ;; false for non-intersection patches.& l% A/ h1 |/ y3 d4 k
]" o7 J4 |! I2 u, M8 ^( c

9 ?: r( x7 E- F- ~& f! u2 q3 V& h9 x. h, V
;;;;;;;;;;;;;;;;;;;;;;! {6 a( T5 B6 S0 S
;; Setup Procedures ;;/ y$ ?; I$ z! {+ G% a2 }4 _: [4 i
;;;;;;;;;;;;;;;;;;;;;;
3 {! }# l" H  v* @1 S$ K  U: t1 W) Y$ r* G0 V
;; Initialize the display by giving the global and patch variables initial values.& D' l& U4 E8 ~% Q3 {7 w3 D4 ^: g
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 X! }6 [8 e* y. M6 p3 z3 Y# A;; be created per road patch. Set up the plots." D4 D. E- R2 E; }$ E
to setup9 q- `# M1 H* r, O* ~
  ca
+ B9 ?$ V! T* t( h, a: x+ r# L  setup-globals9 p- W4 t6 C0 C3 Y
: m7 [' @8 v( X$ E2 S" s$ a
  ;; First we ask the patches to draw themselves and set up a few variables
7 @! A% x! m+ c# Q6 N  setup-patches9 C( g" K  w  |0 b5 \$ v
  make-current one-of intersections
, R& v( P, H* ?) m% P) G/ B  label-current
! A1 Z3 G( \- B2 w( r- h: l8 P7 K
6 T) T* C. ?2 t  set-default-shape turtles "car"
0 i. k! B$ ]9 N( H$ B% t2 P+ ]# Z0 C2 g( r2 j0 J+ s* M: F. J
  if (num-cars > count roads)
5 _  D- z; R* }9 E, T. [  [
+ b. K* q$ I9 n( ~% c8 h+ E    user-message (word "There are too many cars for the amount of "
# u6 i; ^+ f6 ]                       "road.  Either increase the amount of roads "+ F7 W+ v0 ]) d
                       "by increasing the GRID-SIZE-X or "* T% f8 A& K6 \* [$ I' ?% b1 q& p0 a
                       "GRID-SIZE-Y sliders, or decrease the "5 e9 ?0 A  J( E: O- h+ v3 G4 @
                       "number of cars by lowering the NUMBER slider.\n"8 Q, T! K5 p8 o- k: d
                       "The setup has stopped.")
* W; ?9 E# p8 h/ ]* j8 x9 G    stop
0 O5 C$ e* E: D( l$ ?1 i6 i# r  ]$ X9 H! E, H. v( Y

5 d' a: Z) Y0 ]& M' \9 |! g+ t, B: V  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- z$ [- M, Q7 d* E2 h+ ~
  crt num-cars4 x3 r9 ?% |. E, m
  [8 s8 r/ L# V3 T5 w
    setup-cars) q/ ~! W' ^, c, I/ ]# D( G
    set-car-color# I* L' t7 a. H5 c
    record-data3 l4 _6 l0 D; [' p' F
  ]
2 I! t$ I# `$ k- g, r1 N7 P
) k  I! C* g8 f6 n- h8 d: B! J  ;; give the turtles an initial speed4 b" V% w2 o0 P* t
  ask turtles [ set-car-speed ]
! n/ f% ]) K. X# Q: v$ T6 @1 Z) k/ h$ M/ r: K8 j' K
  reset-ticks
9 S1 J5 a% Y6 J9 s. }end% `( {7 I6 K/ b! \
2 d# T) R* Q5 M) a* W5 Z
;; Initialize the global variables to appropriate values
3 @# t( M! n4 h% i" I- ]3 qto setup-globals
. z2 H! A8 A- n0 H; [! ^0 b  set current-light nobody ;; just for now, since there are no lights yet: {8 X- V% G; o8 L
  set phase 02 c; u' o8 w* n0 }% K
  set num-cars-stopped 01 G. ~/ `; ?9 U6 U: n% j) O
  set grid-x-inc world-width / grid-size-x+ i! U5 e" y0 a- L3 B2 q2 a! B3 g
  set grid-y-inc world-height / grid-size-y& D! q- A( y/ M, U9 x" W0 z. ]9 x

/ M1 ?& O. Y$ d* S; j; e  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  m/ v: n! [" s9 @3 e1 @  set acceleration 0.0996 @8 F1 V/ u3 t8 {6 }( Q2 P! G/ K
end, R( N4 O6 A3 m& q# ^
: p  d  g2 J4 k! z! o# W7 A
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% o, }5 c: h, W" i$ w" F0 k4 a& y8 k
;; and initialize the traffic lights to one setting- O1 \% g1 ~  U. ^4 y$ A7 Y
to setup-patches9 Z" @9 l( \* P% J
  ;; initialize the patch-owned variables and color the patches to a base-color
, `7 s' k3 X* {* {( z: `3 u  ask patches
* X4 w+ \  W, V1 e! H2 d6 F  [$ [: J, [5 }% ?; q$ F
    set intersection? false
+ h, {; x& S# m& ?3 s+ @# {( ]    set auto? false+ o0 c9 {; s8 z6 U2 P. j2 d
    set green-light-up? true
, B$ S0 z1 i1 {7 |    set my-row -14 w% U+ Q" v1 ?- U! y+ B" z1 h
    set my-column -1
# O. m( t8 o0 v4 v. `$ V$ F3 U    set my-phase -1( F/ t0 J( z) j2 `
    set pcolor brown + 32 h9 Q$ Y2 J3 p; P9 T7 A* g
  ], e- m: k5 L; b. R# f$ O) E
7 Y5 K0 R- I. L  {6 o% J6 h; a
  ;; initialize the global variables that hold patch agentsets
7 x9 y1 `( O6 q  set roads patches with
- W. A& Z8 ~% s+ ?% `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 }8 A( T7 O/ ~( {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 }5 X* W8 s( u3 O2 C2 k3 f
  set intersections roads with
# _0 S8 J) |4 t5 a; X! _: L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! b. Z% h, V$ e$ \/ R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' q! ]) M* W8 G. {; t* I
, }  K* L  B$ Y5 s
  ask roads [ set pcolor white ]  |7 V. c5 r# ^  x+ r# N4 K
    setup-intersections
+ m7 Z4 w) X" k. W3 T$ T& X" I, eend$ W  y5 j7 T: t$ \8 r/ [
其中定义道路的句子,如下所示,是什么意思啊?
8 R- ]% @) [- Q( M0 v, M% _1 Y# C! V set roads patches with- A, @, a( m- P% ~9 h- d" R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 \7 {. c: o) G" g. u; I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ A& A; k7 Y3 v: w0 V! D8 E; L+ Q5 a
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, 2026-1-22 17:23 , Processed in 0.016383 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