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: 9489|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。
3 F8 o: O' n/ m$ _0 U# ~netlogo自带的social science--traffic grid这一例子当中,9 O# @' ]3 h- U  D1 p6 v
globals
/ Q- c" j- s) U4 V& \& H- @7 N[
+ I3 k8 X( ?5 t  grid-x-inc               ;; the amount of patches in between two roads in the x direction1 u: U& H9 b: U9 y' G
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 U7 H" j! n9 t+ o6 l. j  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# X* z0 j8 e4 u
                           ;; it is to accelerate or decelerate
% P8 g5 l4 i6 G6 O9 r; L  phase                    ;; keeps track of the phase% _/ R6 L4 T9 H0 U$ x
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
/ a, D# Q1 |; C) b+ A: x5 F6 p1 _; h  current-light            ;; the currently selected light
, g* f* M; ~$ d9 m+ M7 k& C& |2 d
" g% S" p# @+ [3 R- W* h$ U  ;; patch agentsets8 o6 _6 X; j6 M$ \& B+ L
  intersections ;; agentset containing the patches that are intersections. |, H7 v. ~7 k
  roads         ;; agentset containing the patches that are roads, |" |" h8 O5 D% X" K% N
]4 [( f" s( X  F2 ]$ L2 j
2 v' A7 T& _. x5 x+ Y, y  |
turtles-own3 \/ P: ~, w3 V$ ?1 K
[$ z5 e, l2 }8 _, A: c
  speed     ;; the speed of the turtle
, C* n; ~; R) f0 ~  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. T9 ^; l. j/ _) {  wait-time ;; the amount of time since the last time a turtle has moved
  b) e6 b: f& V4 ]4 G$ A+ {. []
# i  V* S6 L) x4 H  n# w/ C8 D, o, h% N
patches-own9 Y- P4 e* r' B
[% D9 P  a. f+ t
  intersection?   ;; true if the patch is at the intersection of two roads! {( t/ y, H/ L( ]1 R, V: n, p3 W
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 G4 {' V% H1 \* H6 X5 [2 ?                  ;; false for a non-intersection patches.9 E# l3 Z# |$ D4 ~
  my-row          ;; the row of the intersection counting from the upper left corner of the
4 U/ t% K) T# f3 _3 Q2 z/ N                  ;; world.  -1 for non-intersection patches.
) C3 `6 F+ e) Z1 S6 T$ t5 P& c  my-column       ;; the column of the intersection counting from the upper left corner of the
2 X% r+ `/ ^( w  ^4 x2 P% x. V" J3 ^                  ;; world.  -1 for non-intersection patches.% E1 Q2 S) L. S: s7 n9 L
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.% ]+ L3 p8 m" L' d' G( \& S
  auto?           ;; whether or not this intersection will switch automatically.
9 w) z! n/ p! Z) \3 |                  ;; false for non-intersection patches.) z2 G0 b0 x& ]  w2 X% v
]! x  k2 `# Z# j/ ]% ?

. \; o0 R& ^; i2 C
0 |* U7 k, y' i9 f$ u& ^;;;;;;;;;;;;;;;;;;;;;;
! _3 \  n  m- Z( R. ^; W$ X+ ~;; Setup Procedures ;;- p1 a0 P! `  V/ |
;;;;;;;;;;;;;;;;;;;;;;0 M! f8 Q9 v* e$ b+ O
% E$ J4 W4 D8 Y( g8 m7 l$ {6 M
;; Initialize the display by giving the global and patch variables initial values.0 h! y& M' `2 V; g! e" D
;; Create num-cars of turtles if there are enough road patches for one turtle to
) ~  L0 s- |& X; y4 ?;; be created per road patch. Set up the plots.
# T1 _) g% |& R) u4 G3 D0 b, {0 l1 Wto setup/ {. B8 b. }. M% z$ l  E6 G( p
  ca; ~# o; d- D7 [* Y# D# o5 p  E
  setup-globals
& G8 z. m$ `( k
' n/ y: ~( a7 Y) A' J( u# Z& i* K, M9 ?  ;; First we ask the patches to draw themselves and set up a few variables
, b; q4 j4 ^9 c' I  \  setup-patches5 N& J% {$ A: B& s5 _; j2 L
  make-current one-of intersections
% D( o. y9 [1 Z. i  label-current
% H! Y6 s2 J, H4 x! I% r6 S
! z! b- p) C2 I! }4 c9 \  set-default-shape turtles "car"
" B3 S7 d) ]2 ]4 |( S3 _2 y+ i) b# N. i0 h
  if (num-cars > count roads)
) t- Q! ^3 d; R& W, x/ T5 F: {/ Z  [; [* O7 B" |6 r" [
    user-message (word "There are too many cars for the amount of "
" f. c* m3 ^& T# {                       "road.  Either increase the amount of roads "
- ], L  s2 t/ a& l; g7 z/ Y7 @                       "by increasing the GRID-SIZE-X or "
( Z" j. k# f8 {$ k8 G% z6 R                       "GRID-SIZE-Y sliders, or decrease the "
9 T5 d* s0 ]9 _7 \                       "number of cars by lowering the NUMBER slider.\n"
8 I6 g5 O/ v7 }" r3 c                       "The setup has stopped.")# S, [; m* @; Q: ~: ?4 h
    stop
! h  f5 N* \2 `4 v1 Q  ]
. d% }  H" `( m/ |# P  P
( `. @/ b. E- @" Q3 u  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' `1 ^9 r/ U. x  K* A( d6 N) B  crt num-cars5 g! |" l  v6 O0 M
  [
$ b& f: E8 W# E) s) L% ]    setup-cars4 o3 X: K; J2 ]
    set-car-color
; h+ A; t( ~  X  y. a" V    record-data
8 }& X) r1 P5 S, W  ]
  E: |/ X7 N* L
) |3 p  @5 R1 [9 j. e  ;; give the turtles an initial speed
8 Q# C5 S$ N1 Z4 g) f/ B+ W( \* ]  D, \  ask turtles [ set-car-speed ], P! O7 I7 i. \$ B% E  z+ J
3 @9 Z2 M0 P6 j- p, @# G. k
  reset-ticks$ g4 ^+ T* b9 G" }
end7 K" x0 O4 J" v# S( c/ T9 H! E6 {1 a

; f4 {4 N- t# _/ i;; Initialize the global variables to appropriate values' K/ |* s, P% T% y
to setup-globals8 Q; ]9 M+ _3 S7 S
  set current-light nobody ;; just for now, since there are no lights yet
: @+ \0 r9 Y) |* U  G5 \7 a  set phase 0
, \  n+ P+ s  t8 G& \7 G  f  set num-cars-stopped 0
6 u. Y0 p/ E) E* |  P$ s7 `  set grid-x-inc world-width / grid-size-x
+ \" e, d7 c2 T: h/ l- W2 e  set grid-y-inc world-height / grid-size-y4 M& H2 l2 |$ t+ h, }
% ~6 D5 A4 e5 L4 r
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( H* F, F1 p- |. x
  set acceleration 0.0998 q" G- P( a/ |, t
end5 K& [* e1 G" p; }+ _: K0 T
, Z' {$ H5 y, _
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- ^! `7 h5 I9 c5 H;; and initialize the traffic lights to one setting/ V+ D* Y& M/ \( m
to setup-patches& d- u3 H9 a8 i9 [1 L4 U
  ;; initialize the patch-owned variables and color the patches to a base-color; m* j1 ?7 a( Z( o: @
  ask patches4 ~0 ]" l: m$ `/ Y8 Y% ?
  [
" M( y1 g/ X# D# `0 O( }/ B    set intersection? false
3 r4 b& _* d5 Y1 A    set auto? false
5 y8 g2 O$ R4 f$ o    set green-light-up? true5 ~0 J7 e0 b3 g1 R- z: D
    set my-row -1
" Q6 ]; Y$ e) ~3 b    set my-column -1
6 ~  L; B# q- r( A% J    set my-phase -15 p9 b! i! [+ l8 J
    set pcolor brown + 3
2 U. h. q" c" z# w4 b9 N  ]
: X# p: f+ Z  D* a) ~7 \- x/ _' k: \% l
  ;; initialize the global variables that hold patch agentsets' r( @' s" K' ~5 i& _! x
  set roads patches with
! W7 ]# F7 B$ C5 J6 j" C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: K/ P/ P  O8 @/ ], n. V. ^. f! a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 I' K" W* ~$ b; |2 Z5 B4 w8 e  set intersections roads with
% W- Y. B( w% e( w* o( R6 x    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 L0 e2 }+ v7 s  Y! L( z, c    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ c1 s! \- y/ @* M" s8 @) v8 ]" N% s7 [/ J
  ask roads [ set pcolor white ]% F, K6 j: l7 I( t
    setup-intersections
9 Y8 h8 f+ x9 R2 x, o, u* @7 Dend
: C. {) {* e6 K其中定义道路的句子,如下所示,是什么意思啊?
0 g( E  ?% D5 W' j" F4 g- E set roads patches with
, U3 e) O1 Q/ \; _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 E5 r8 x& M) h. Q( g, N3 Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; y9 T& Z! E! H2 |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, 2026-4-17 14:46 , Processed in 0.020987 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