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: 12289|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。
+ d( x8 A! u7 P& X6 ~+ {" Jnetlogo自带的social science--traffic grid这一例子当中,
1 n7 V! P9 u) Vglobals
7 O$ f7 a4 h' y% Y' q' g[
' z+ E) G. b- q$ T( _5 c  grid-x-inc               ;; the amount of patches in between two roads in the x direction
+ [1 r. j5 q" d! M" \8 W2 j  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 N4 X( F5 q/ H; S4 A9 Y% I  acceleration             ;; the constant that controls how much a car speeds up or slows down by if8 r7 t2 U9 h  {3 ?% S3 P% N4 s
                           ;; it is to accelerate or decelerate% A, N5 j$ \5 ]4 A5 W4 o
  phase                    ;; keeps track of the phase/ P8 h) _7 O5 W* Y$ f5 o9 _4 X/ ]
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 r/ c, j  p( A: I( K  current-light            ;; the currently selected light
6 c' R1 V9 t7 @* [6 D& k+ F3 s* G5 g, x
  ;; patch agentsets
: ]% }# K1 C, w/ m  intersections ;; agentset containing the patches that are intersections& k  Z. ]7 C# ?6 T
  roads         ;; agentset containing the patches that are roads* ?/ `% ?3 g( s7 l* v1 A
]
6 e+ K% X- I- x) {9 ?& R/ I+ n# Z) J( Q
turtles-own
, Q1 d) `& S# d* C- V[
0 t) E9 H: W, ~6 j! N# e3 T8 w  speed     ;; the speed of the turtle
. r; D7 J" _% N$ s  up-car?   ;; true if the turtle moves downwards and false if it moves to the right% c4 d; h" J$ @% O/ U, i% w; I
  wait-time ;; the amount of time since the last time a turtle has moved
: E! L5 O7 V! j% T7 \+ X; m$ |]
  X1 V  W  f/ x7 S
! z" i6 A# \% n0 }  k  \$ ~) Xpatches-own3 Y4 ]: w6 o3 h% R
[
! m$ `* y- T# f& z( A  intersection?   ;; true if the patch is at the intersection of two roads$ U9 I& y: R+ k" q( `
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.( Q" j. X# C4 o4 ^
                  ;; false for a non-intersection patches., I2 @9 A+ u) k5 e
  my-row          ;; the row of the intersection counting from the upper left corner of the, s5 D" d. F+ s: B$ U: h  K
                  ;; world.  -1 for non-intersection patches." @2 m  R+ y' p; x* \
  my-column       ;; the column of the intersection counting from the upper left corner of the
1 z% S7 a% |. H7 U* [                  ;; world.  -1 for non-intersection patches.' B/ n" x7 Q; ]) s
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 z# t( w* Y4 G$ G2 @( v+ j  auto?           ;; whether or not this intersection will switch automatically.- m+ t* D& f* [4 ]) i2 }/ w4 C
                  ;; false for non-intersection patches.
7 m$ u4 D* V  p# _4 p]
% I" i/ @" H2 ~" R& H
/ d5 Z' H. {0 Q2 L+ O* S
4 ~& x- A4 {+ J* \3 m4 y6 m;;;;;;;;;;;;;;;;;;;;;;7 }0 I7 z; B: R% ?
;; Setup Procedures ;;8 P4 B: K8 a0 _! h, ^) K9 _
;;;;;;;;;;;;;;;;;;;;;;6 {/ f6 N% t7 ~' h. z! d; X

  C; o: o, p8 E' P: i8 B+ C  E;; Initialize the display by giving the global and patch variables initial values.
  M* \- @7 b, v. ]7 H3 g;; Create num-cars of turtles if there are enough road patches for one turtle to
# M1 V% L. z8 z- ^;; be created per road patch. Set up the plots./ l3 g2 u) d9 o. H
to setup
6 A+ [# E* F1 Y  ca
) o( k, n4 e4 R$ X& ?/ v  setup-globals
9 y' P3 T2 ^, a7 F; I
0 J4 c. `# ]8 `  ;; First we ask the patches to draw themselves and set up a few variables& t9 c5 b# P: O. S0 B
  setup-patches
7 t0 M" C8 @8 a- ?  make-current one-of intersections/ _5 G! B/ \$ j7 B
  label-current
. j4 _( Y% d- j, |, ]: |0 z' X5 v" X3 @1 z
  set-default-shape turtles "car"
  s/ M  a- @5 @& e9 O/ e8 L, s3 L
  if (num-cars > count roads)
4 L& Y- j/ Y# y4 d4 _  [
( {$ O! A4 |+ W$ Z  Q0 o    user-message (word "There are too many cars for the amount of "3 }# I8 S" z4 Q! S  N
                       "road.  Either increase the amount of roads "0 ~- @) ~, V+ p0 O
                       "by increasing the GRID-SIZE-X or "
' ^5 S& U% Y- t3 Q' A                       "GRID-SIZE-Y sliders, or decrease the "
& s! i% M  x' @+ V                       "number of cars by lowering the NUMBER slider.\n"- i& s, w$ M+ u# h0 F5 e/ E, {
                       "The setup has stopped.")
4 R  r4 }7 C6 E1 i6 L    stop
+ x) o4 I0 [  }/ _/ C' o  ]2 `. c. j& N1 l, t* x( I; F& m

& v0 g5 P7 H. h7 \  |  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: t( n" s3 b  U
  crt num-cars6 Y4 c. K- Q3 j( G( O4 r8 s
  [6 ?  x# F" o, Q* z
    setup-cars  V7 S3 W/ ?- ]' a$ o9 ~4 \. `
    set-car-color
* L) c9 J3 t2 N) _# ]    record-data
$ M1 e# [1 g- U& S  ]
$ @1 K7 Q9 b7 B; W. ]2 d* V" n, m) c6 b# f+ M3 x/ f  V
  ;; give the turtles an initial speed
$ |0 \2 `" M2 G/ h  ask turtles [ set-car-speed ]
1 O4 f7 u$ h- P9 @- u) S! O- @( V
  reset-ticks
$ b1 o4 T+ o4 H3 y* ?end" Y5 {3 ?3 c; c2 B
- Q+ w  g: N1 ]0 H  y
;; Initialize the global variables to appropriate values% i: n# O2 i4 I2 \# A7 R3 S/ q) t
to setup-globals
( m- x& A. e0 c* T3 S3 |& z  set current-light nobody ;; just for now, since there are no lights yet* P( J& X1 p+ `3 x2 f0 A
  set phase 0
! a! m& r/ E5 \, t  set num-cars-stopped 0
2 w: k& P- w( O( g) h0 F% R  set grid-x-inc world-width / grid-size-x$ G; G" _" Z* g! l) @" O$ V
  set grid-y-inc world-height / grid-size-y$ h0 L' m# P6 T6 \9 A
) f" ]# ^0 L# z* H3 R9 n  D; Q
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. j/ X2 X. w7 N' Z  q1 A4 W6 u
  set acceleration 0.099  {9 c& O- P" ^  Y8 v4 @
end1 a' ]1 ]7 L9 l, a. a4 m

) o! K/ C4 m& j, E5 ];; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 Q. w" L5 F; x9 O, F8 [. x" d;; and initialize the traffic lights to one setting% `/ }3 i* [- A7 E( s' V
to setup-patches
: z6 p" f2 O; W) _  ;; initialize the patch-owned variables and color the patches to a base-color+ c, p7 Y2 i4 D
  ask patches+ M: R1 ]& @$ |2 R! v
  [
9 b! b8 y: J( k  _* O    set intersection? false# c7 `- U; I( x: o
    set auto? false
1 E* z3 o2 K6 l, ^/ m2 \: [0 v    set green-light-up? true
! [3 G8 W# P- _    set my-row -1: N( x) n. D+ X. N
    set my-column -1
$ _! @6 F6 E% x! X( P& c0 W% d    set my-phase -1
/ c% W) ~" @/ }# h4 \$ a1 K    set pcolor brown + 3
: C) E+ r  F: x+ S# `. x" C  ]
% L. m+ Y4 h) w& [/ @/ R% C" _8 V% O. O
  ;; initialize the global variables that hold patch agentsets# E  Z7 K( H4 w+ ~
  set roads patches with
! X) `$ O/ D* I8 S5 U8 ]' G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& Y# ?8 H& t: @, l! K    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 V" g: f4 ?! n$ m
  set intersections roads with
3 ?7 I6 n- z2 O: h4 n& G# R+ [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( U. I6 J* H, K7 w1 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& `1 {( d; s; d& c( m, m
9 o# G- k: e" S7 h# k/ b
  ask roads [ set pcolor white ]# N7 [9 q+ @, o6 j, N  g
    setup-intersections+ w+ [  N! Q$ B6 R( ?6 u
end
/ K+ G8 N7 I( g其中定义道路的句子,如下所示,是什么意思啊?
2 B. e) i% t9 j" v set roads patches with6 `% J) e2 H% Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 i1 m/ w1 ~- q2 K  M) U" s# t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 L" c1 \" L: O9 b# o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, 2026-9-14 19:00 , Processed in 0.018444 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