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: 7787|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。
/ v2 }( n$ t: ^9 ?$ `: [netlogo自带的social science--traffic grid这一例子当中,  b+ y! {* H5 N$ h3 Y5 @) d" b. m+ @
globals
; H  H' s2 E7 w9 C! `, j8 [: |[! `8 d$ X. f* ?5 F) j& L6 X
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# o/ J1 x. Q+ {8 ]% k
  grid-y-inc               ;; the amount of patches in between two roads in the y direction* o2 y4 {  M' p- R: x
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ I- C2 c8 ]0 ~; _
                           ;; it is to accelerate or decelerate
9 H( r7 p* t8 W! {. A/ A  phase                    ;; keeps track of the phase/ _3 e# ~$ H/ D4 C
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 H" z% d$ [2 E7 }& e3 R  G( }- e
  current-light            ;; the currently selected light
$ F! y. ~1 Z0 N$ Y: e6 S/ h$ |' e
6 G4 h  W* c# E* e, R( c  y% f% t  ;; patch agentsets' L# Y7 f- s2 q# s; g" ]% S1 S
  intersections ;; agentset containing the patches that are intersections( H. Z" d$ M" {9 S& W* E4 \4 j# g
  roads         ;; agentset containing the patches that are roads8 a5 z* s0 D! C' J/ F* I
]8 r1 |: y4 a: n( M* O

; ?9 U( g. m4 z9 s2 D* {turtles-own8 E8 M; c9 e3 F
[
2 a( g+ V: \# i5 `3 v% e  speed     ;; the speed of the turtle6 q$ t$ S8 T9 z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right  o3 e; `0 q0 v5 }
  wait-time ;; the amount of time since the last time a turtle has moved  Z5 c: D8 M. J* \' W% r+ y/ B
]' U* \- N4 y0 ]' a
; i8 L8 R1 m  J8 {* Y3 Y3 ]
patches-own% g' ]3 T+ ]! S! h! O: [
[
5 v/ j& b0 h3 K0 _, }5 ~9 G  intersection?   ;; true if the patch is at the intersection of two roads
4 W. w/ s6 D2 H0 B; e  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.6 i0 K9 h8 j# s! ]' k5 s
                  ;; false for a non-intersection patches.
7 ^7 e' k6 C% Q& G/ e  my-row          ;; the row of the intersection counting from the upper left corner of the0 X$ j" Y( w0 \4 u3 s' N
                  ;; world.  -1 for non-intersection patches.. Y1 @5 J# ?/ S0 ]
  my-column       ;; the column of the intersection counting from the upper left corner of the1 \1 g  g$ G4 b4 Y& h1 S  Z
                  ;; world.  -1 for non-intersection patches.. ^* K0 N; m& o+ c  l
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches., }1 e6 R+ u# C9 r$ b9 d7 {7 c  e
  auto?           ;; whether or not this intersection will switch automatically.6 h! Q+ }+ C+ Q! e0 E3 a
                  ;; false for non-intersection patches.
, `; S2 F) W- P0 f]0 b# e- Y5 [8 R+ `7 A& F
5 a5 ~1 d7 J9 X, K

8 q6 C1 f$ `4 U$ ]" Y. e8 _;;;;;;;;;;;;;;;;;;;;;;) A3 I& P3 e/ O. q8 a& v
;; Setup Procedures ;;
6 K. B/ v9 ?- W/ _- C;;;;;;;;;;;;;;;;;;;;;;) b+ F5 I7 X5 a- v; a, Z* V
0 o+ a: c' S; B& ~$ b. V; c
;; Initialize the display by giving the global and patch variables initial values.! G6 t# z# [1 B# }
;; Create num-cars of turtles if there are enough road patches for one turtle to
( @( s( i3 u& C- s/ L;; be created per road patch. Set up the plots.& }; U2 S- Q' V; s
to setup" p; c0 N) u% t
  ca
3 k2 d  I# u* M  setup-globals
# A7 `  F9 z* K
1 M, y1 \4 q0 l1 b3 [7 N9 J7 ~  ;; First we ask the patches to draw themselves and set up a few variables
: p1 h$ }( v$ c7 P2 ?) n  setup-patches
2 p% C( j" o# S  make-current one-of intersections5 g' g% F' b  E7 ~) ?
  label-current
3 e' V' Q& L; |# o# {4 @1 H# V# Y
  set-default-shape turtles "car"$ u5 W6 \5 H; d

1 Q+ e$ w4 F: _5 z9 j0 p$ f8 G; y  if (num-cars > count roads)7 v) S; d3 r) u1 H6 [2 H
  [
( F7 [# H, d/ q) X( k    user-message (word "There are too many cars for the amount of "
( B# V" `# m; I: o) ]3 H: T                       "road.  Either increase the amount of roads "
5 d0 }4 K: [  ^' \+ z5 R                       "by increasing the GRID-SIZE-X or "
6 W9 G( o- |# j1 ]+ d+ c                       "GRID-SIZE-Y sliders, or decrease the "
7 N" n/ p+ b0 D! Z/ q9 Q7 v% M                       "number of cars by lowering the NUMBER slider.\n"
6 i* `& b) a: E- M) ]                       "The setup has stopped.")
% ?1 g- o- Z+ M* c' S! x    stop
% S& Y9 R- @6 ~$ ?1 K  ]
3 s. C( y' O9 Z- I3 r
; P. e# x5 J& X# D1 v! X9 ]( R  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* |: {, a1 `. V+ |6 M  g6 f' g
  crt num-cars
0 x% A4 t! E8 I! j  [; i1 ~: i- H6 w. O/ q
    setup-cars
$ U! g2 `& i3 X5 l, w$ t0 M5 v5 z    set-car-color0 X& R% a1 l/ ^1 A' n. k
    record-data
; B* c- u# z8 Q; l1 @  ]0 f5 ?- U( Y; B- i) I0 T8 {

" s) Q$ s- F" ?* L" z  ;; give the turtles an initial speed
6 Q. J8 v+ a' F( O  ask turtles [ set-car-speed ]  Z# ~- }! n7 I7 x# t
4 Z5 n( x+ _+ N. W) O) u
  reset-ticks  J% W! w0 }$ ]! y$ s
end
+ ~* t% I( b/ _9 T) r' a0 m0 t) ~( F9 C; {) a
;; Initialize the global variables to appropriate values
0 K$ C) B, _' ]  tto setup-globals
! Y. K& ^+ Z/ k% P6 k9 D  set current-light nobody ;; just for now, since there are no lights yet
; y# w$ D9 z; _7 j7 r5 Z  set phase 0; Z% e, _0 I5 a  n1 T" z8 S, F
  set num-cars-stopped 0
' H# M# [% I; J6 ^+ D3 B% o% m: P  set grid-x-inc world-width / grid-size-x
. w0 {1 B% W- u& p) k  set grid-y-inc world-height / grid-size-y
/ f( D7 x4 ~  p- k5 h& m3 |
8 S( }2 N1 D/ x# N3 f5 t. i% N6 P. _  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 |. R, Y) |1 k0 q- a8 H, o1 I" w
  set acceleration 0.099
- d9 v! K' H; o- eend
: A$ Y+ X7 `+ j2 C4 s$ C+ k) o8 }* [% v. |& Q  N
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 |) ?. ]: h5 ^0 G/ O
;; and initialize the traffic lights to one setting0 T* W& s$ H- {: P* R
to setup-patches/ ]2 e" M8 r- V3 w
  ;; initialize the patch-owned variables and color the patches to a base-color
  M/ Z6 `0 y3 }+ ]  ask patches* M# p* @" n4 E7 w( Z
  [2 [: @* _( f$ Q7 X4 _* O
    set intersection? false
$ m( W- f; p3 B) ^% t    set auto? false
9 f: z5 i! G* `9 N" C# f/ Q    set green-light-up? true
0 K$ ]; r& k, O2 |: m1 a    set my-row -19 v9 I% B( e: C/ Y  I% `& p2 ^3 \
    set my-column -1  e. m, i0 m7 g' F& [
    set my-phase -1
' a& i2 E: k1 i# f- Z    set pcolor brown + 3
  ]2 u5 r) U$ c4 q6 c  ]& m- u4 d0 \. q1 n! [- u" e- }

" f/ ?' B2 d1 w( X  ;; initialize the global variables that hold patch agentsets
! s9 _2 r- v, {3 ~9 h; o  set roads patches with! Q; @: j" M8 y1 U4 a$ ~) M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 V8 a" K6 Q# \; Z9 T3 i6 S+ T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# A) d* R9 K% ?3 ~* ~
  set intersections roads with2 p% u" ~/ s3 |, n9 c  t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# T0 u9 X$ Z5 p/ d) A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 T, n& C6 I5 Q! v9 A. A- ?3 g9 O, ]7 H7 f; T/ ]- n
  ask roads [ set pcolor white ]
/ j9 G! F0 F# E0 _% \    setup-intersections5 J0 u1 ]" X, w/ a9 {
end
( H1 Z! I! s1 r/ v0 M" s- t9 M其中定义道路的句子,如下所示,是什么意思啊?2 l5 |; S9 q* o
set roads patches with
0 O1 K3 `. p) ?0 E6 p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ Y" V5 j& f6 ?# o( S* W    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& E% L1 A- u& ]. y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, 2026-1-14 11:30 , Processed in 0.014362 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