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: 12007|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。
7 e# l" s1 [/ y9 U- cnetlogo自带的social science--traffic grid这一例子当中,
2 C; l0 x; ]$ p4 C1 B3 l$ u9 Dglobals) l. N1 _; M. p! Q
[% H5 `$ j) U+ ?1 W
  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ G" \6 S4 n$ R  b- f
  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 @# ]# c5 S+ L/ u' m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 `) u2 _5 o2 N' W- E6 l6 T
                           ;; it is to accelerate or decelerate
0 V9 E3 s. l5 H5 q; s( M- ~. |7 j  phase                    ;; keeps track of the phase! g% ~, e' Z' V2 b
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ j; _0 y4 S3 T$ K/ Q  current-light            ;; the currently selected light
1 U; y! K. P: X3 j2 N: ]7 Q
% Q/ p4 O: Y" k4 e6 v5 T  ;; patch agentsets3 H- i- l6 u6 n4 r9 `% t/ a' T
  intersections ;; agentset containing the patches that are intersections0 h3 G" O% @( Z5 k  E$ u
  roads         ;; agentset containing the patches that are roads% W  T1 r; ]' }) U( s$ n6 v1 J
]
' F/ q) L! W. Y9 Q0 n- Y
) o7 s; z" c6 A2 y( y3 d2 [turtles-own1 }5 E' Y) e3 D3 Q8 ?
[
- ~7 o4 D. Q; t8 f# E4 b  speed     ;; the speed of the turtle# V; o# d; R* i; J) C& H9 w
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" {1 E5 C7 I, ]/ k) j$ N3 x  wait-time ;; the amount of time since the last time a turtle has moved# ~  Y" k( N+ p4 s' g
]& J9 o0 ]. q% u

/ u! H4 ~4 a% m+ V) @& Zpatches-own
( f. h7 N  h( f/ q0 N, Y0 F[! k  K) }. b" U4 e( _
  intersection?   ;; true if the patch is at the intersection of two roads
. d7 U3 F3 W! }- C# U0 D0 A  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
: h# Y7 k+ J' X                  ;; false for a non-intersection patches.6 ^1 F) I( ?0 `8 e0 e7 g, V7 i5 s
  my-row          ;; the row of the intersection counting from the upper left corner of the
7 x3 e& L7 O& \$ z$ y                  ;; world.  -1 for non-intersection patches.1 ~# N. V. u: V! q
  my-column       ;; the column of the intersection counting from the upper left corner of the
9 B. p8 e( t- j; Y1 X                  ;; world.  -1 for non-intersection patches.
1 d7 R7 k$ R- w: `. b) d' V  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.$ V- E. G6 ]) ^5 b3 ]1 X. c
  auto?           ;; whether or not this intersection will switch automatically.  m" P$ W  n/ U) X  E6 U
                  ;; false for non-intersection patches.# c  [7 I$ R) X. C) }  m% q
]& s6 u4 b" z8 x1 B5 R

4 F% J* ^! D2 k! n( x& @3 A) I/ [) V' `0 g) P" k& s/ x; _( n' Y
;;;;;;;;;;;;;;;;;;;;;;6 V, l% C0 x2 Z# H* q
;; Setup Procedures ;;
; A  }4 y$ @' o- f;;;;;;;;;;;;;;;;;;;;;;, Z" h  E( z: e6 T( B6 n1 }' y, O' G
1 v, d% ^& j( M4 R8 @, w
;; Initialize the display by giving the global and patch variables initial values.
1 v$ m) T' U. `0 [+ D! @;; Create num-cars of turtles if there are enough road patches for one turtle to, P5 U4 t0 C! G0 Z' s! l" p- S2 X
;; be created per road patch. Set up the plots.
# A+ i3 n+ Z- lto setup
# u+ a1 x0 C; r! {3 Q7 d  ca3 G  F, N. X2 T- w
  setup-globals
0 s0 q+ o+ m) @; [" r: O& a" {, u1 m7 M& \% `/ `5 B" h* w3 z
  ;; First we ask the patches to draw themselves and set up a few variables
/ s" g  A* Q& M# C6 F8 }' W  setup-patches
( d; X. E2 f) l, Y: e! o5 o  make-current one-of intersections
# G; D( ?! k/ I. @) R: e1 s  T  label-current# y) w& m6 x0 Y/ }
. {2 M& Z; w6 g! V$ G" R9 c
  set-default-shape turtles "car") l! d9 c. K0 |' ?+ X

* j% i* Q# k& W# M3 d- e" {  if (num-cars > count roads)" |( B  O: x( Y7 w  A# C
  [
+ ^, h2 W. V4 ?( q7 i; }    user-message (word "There are too many cars for the amount of "7 ^4 [1 S! C/ @
                       "road.  Either increase the amount of roads "
* P, F5 w- u( P0 e% R                       "by increasing the GRID-SIZE-X or "
  i4 J& t. p! K  J) X. m% p                       "GRID-SIZE-Y sliders, or decrease the ", W. o( v; l3 a& p  \* k
                       "number of cars by lowering the NUMBER slider.\n") \9 m% K0 L% L/ E& d8 ^8 w9 ^5 Z
                       "The setup has stopped.")2 F8 l) e; s5 `0 ?
    stop
. g0 t; {7 A, Q5 E  ]& n( I( e4 P% t! J7 p. T- P6 f
4 A& ], a1 B& \9 c/ b, k6 j/ n
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. F9 T3 T; S8 w1 C9 Z  crt num-cars* S& w9 {( i9 Y/ q* R9 b
  [
, _" O/ z8 B. w5 b( p+ p( t* e4 g  J    setup-cars
* N  C3 s" }& e% |* Z5 I( C! U* V    set-car-color
$ L9 {: D# y- f% }7 V8 a    record-data
7 E! I) y% g2 {  ]1 W$ `7 {" [, R2 V' n* I: h$ D
  U5 X1 f" H0 _' W5 h
  ;; give the turtles an initial speed: Y7 C) M/ m! ?( W2 d, y- q
  ask turtles [ set-car-speed ]
- d" I1 Q- R- U6 b
. L9 e+ N& O4 f/ A; Y; O$ ?% I) V6 X  reset-ticks
6 v# d, h& F2 C& D3 D- Yend% L7 q/ ]) @/ E, m% W
9 Y4 e8 q  K. g1 J6 a  ?) F1 k
;; Initialize the global variables to appropriate values) _: i: ]/ T  h! z4 }
to setup-globals
9 y4 i, L! [: G% b9 w9 C# ?  set current-light nobody ;; just for now, since there are no lights yet3 K# H5 Q% e, t
  set phase 00 M1 L: M$ Y" H3 ]* ]- c' b' V
  set num-cars-stopped 0
5 {* Y' E. S+ K) b  set grid-x-inc world-width / grid-size-x+ K* e# t  P) n! a
  set grid-y-inc world-height / grid-size-y( N' p3 E' v, S' I" P/ I

9 B4 z) U: k! m- j1 d# Z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 i; d' q% E/ C2 S; D( j  set acceleration 0.099; P& u/ f) |$ {
end
2 @* y5 |8 E$ Y" G2 P! n+ K3 G6 O9 r, I9 t! p6 r
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 w( a" _! l& }7 D
;; and initialize the traffic lights to one setting4 m  l- K: k: c7 j6 W
to setup-patches& Z  b; Q) F( @/ C: l
  ;; initialize the patch-owned variables and color the patches to a base-color
* U0 [! s* l* \7 r  ask patches, }5 m. r! b- S/ q
  [2 K- J6 M$ I( i1 ?' k0 v
    set intersection? false
  T/ \/ N+ M& f& {    set auto? false/ c5 z. k4 G! a8 ~
    set green-light-up? true
- H  b( t& I$ I8 |3 t+ R( A    set my-row -1
/ @( v" x3 M2 ?6 N    set my-column -15 ]1 l6 q% z/ e! O9 s9 O
    set my-phase -16 R& I  }2 {4 A1 L
    set pcolor brown + 3
* T- R1 h- ~8 l- y1 q  ]
8 w9 w7 e/ g% |" n2 N
& V% m( Q( C6 Z6 z  ;; initialize the global variables that hold patch agentsets, E* ~& r) l; b, y/ r8 b
  set roads patches with4 j$ s9 W. h# y7 S" o& {6 c* D" p
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 z6 m6 l" A# x$ v/ U: S# r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ r8 Z5 {/ Y7 b, h4 R* f- U" q1 X  set intersections roads with
5 {. ?) _5 ~1 Y; i" G8 o8 M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 F4 `' l: o" P: H3 e; Q# x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 b# ]: [. x0 ^1 f' l8 K; T
0 G, [6 p: X* H+ ~6 ?
  ask roads [ set pcolor white ]
# m, \, |& F. g+ w7 ~    setup-intersections8 o$ R* [7 d7 O1 k2 X* I7 e
end
# K) B8 u+ ^2 \2 V0 z其中定义道路的句子,如下所示,是什么意思啊?
, u& W9 v# o8 X2 E$ _' n set roads patches with
$ N% {* k6 p& a6 u; u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 e  ^2 I' W+ W9 [# y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], @; o# S: v- K2 h  I
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, 2026-8-29 16:04 , Processed in 0.015015 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