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: 11804|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。
/ v7 f& p; ~; i& B( T7 ynetlogo自带的social science--traffic grid这一例子当中,; |8 V: l( N( a$ z
globals
6 A- W) S) b' J# S0 x. N- i( g[
6 ^# u6 N& e) O0 S6 z  grid-x-inc               ;; the amount of patches in between two roads in the x direction5 }$ v; u: m' I* j6 ?) X8 D' A' e6 N: w
  grid-y-inc               ;; the amount of patches in between two roads in the y direction8 [, K: z8 g$ ]$ i. f( C
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
6 V/ N3 V; U0 u+ v/ ?( {$ P                           ;; it is to accelerate or decelerate& y6 o" n. V- l6 y4 A
  phase                    ;; keeps track of the phase
( P- X( T7 n5 o$ |+ @8 U2 N+ u  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
  Z) C7 R* n  Z5 G" K  L1 R  current-light            ;; the currently selected light# b- {' W! B! x; }( v/ I' @
8 Q; y! N! J, ]8 q
  ;; patch agentsets
, {! z# i+ h0 ]: K1 A  w0 z  intersections ;; agentset containing the patches that are intersections- ~3 r5 j; o! V* v3 A! k
  roads         ;; agentset containing the patches that are roads: G3 D$ }) o- |6 o! z: `3 D9 X
]
9 }( J; D# L4 S: r
  P' v- j* D% T7 r' v3 m% X7 w! Kturtles-own; c$ O/ h6 g5 M* m; }% T
[
) x8 a' B* P4 \9 |$ f  speed     ;; the speed of the turtle
+ U8 I" @1 }3 I/ {; e0 o9 T  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
+ l6 [0 D4 b. N1 t7 V1 O  wait-time ;; the amount of time since the last time a turtle has moved+ l) p4 R3 u* N8 a; h6 C5 e
]
2 r0 T9 n# R( ^! ^/ S+ ^% z# u( k- Q; @; x, Q& Q
patches-own4 \: Y- ^3 c: P
[! ]0 Q; _% ~$ ~0 u6 f4 N8 a
  intersection?   ;; true if the patch is at the intersection of two roads& W5 O. M3 x; R9 ~5 ^
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- q* G7 d3 C8 e8 J9 e
                  ;; false for a non-intersection patches.
4 D8 g! O, x% R; v  my-row          ;; the row of the intersection counting from the upper left corner of the
$ T) [5 Z; t# D3 p) l( z                  ;; world.  -1 for non-intersection patches.
6 q! @- ]% x7 g& G8 r/ d$ Y, F$ L5 R  my-column       ;; the column of the intersection counting from the upper left corner of the" G* A) w9 g6 U
                  ;; world.  -1 for non-intersection patches.% T0 U% B1 a9 x1 j- W4 c6 V
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. z& w9 I6 h2 Z: C/ R, N4 X5 L  e  auto?           ;; whether or not this intersection will switch automatically.
: E. _) Q9 ?4 a* x                  ;; false for non-intersection patches.
$ R& a" z( t" C9 m% S) E]4 P+ r+ q3 B/ x2 @& f

9 {# ]/ |0 k# x0 M  f; @/ l( ~: a2 w! D4 ]
;;;;;;;;;;;;;;;;;;;;;;
" u/ c# R, O* Q2 ^# y;; Setup Procedures ;;. c. g2 A3 G6 e
;;;;;;;;;;;;;;;;;;;;;;
" c' z- A: [4 z( i; Z5 S( M
* f- c6 V9 m/ E5 |;; Initialize the display by giving the global and patch variables initial values.' _# W+ B: R+ N$ b! l
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 `) r  T0 L7 a& P  O/ L& x! o" \;; be created per road patch. Set up the plots.
( n9 A3 N( J/ h' h2 J/ Lto setup4 L) |& o" w8 Y4 Y& u& B# r
  ca
  c0 _6 J4 @9 W  r( s1 R* ^  _  setup-globals: N% h; P% W0 V0 \, e

  y+ ~( @- w: g, {' A! ^  ;; First we ask the patches to draw themselves and set up a few variables
7 v7 _3 K6 q: j  setup-patches4 l% C" G8 b- K% a5 x: y
  make-current one-of intersections
; A* z" x1 _: I3 ^  label-current
0 s5 {8 j$ o) M$ S7 D5 }1 u* z* m/ ?) A, D* l
  set-default-shape turtles "car"0 K* T/ D% f# B% X% d

- Q- }% Z, Z2 y( x0 f# s* I  if (num-cars > count roads)- o% |3 s" V+ a2 }8 K
  [/ G# u) O' E1 I6 U/ r$ x9 G% j
    user-message (word "There are too many cars for the amount of "+ B, t" W1 J, J+ J- }* X) p
                       "road.  Either increase the amount of roads ", _7 ]- [% Y, B3 M
                       "by increasing the GRID-SIZE-X or "
' G* p* U, z* X: D, u                       "GRID-SIZE-Y sliders, or decrease the "
% [& [2 V) T: i1 O. j8 \                       "number of cars by lowering the NUMBER slider.\n"6 t; r, j* L0 O' U* T# d6 h5 A. K
                       "The setup has stopped.")
: C- y# {/ Q8 j7 P! A) H, U) D+ I! r    stop
( B4 E$ M* K& L( U& e- n  {* `  ]9 a8 F5 A8 v7 [3 S' a9 @' N

: I& ~% X6 v' |( Q  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( ^7 _7 z7 [! \% L3 c6 S+ o
  crt num-cars
5 s7 Q3 I# a( Q. ~3 W  [
# X% {0 @$ ]0 R. h4 k3 s    setup-cars
3 z; c% |% m* J( w6 C# Z    set-car-color
& n+ U/ P: Q" I- E& U$ a    record-data% G% C2 K) I, ^* l! t4 `* _4 G/ A
  ]
  E% E) f' E; }# W6 T' p: R2 S6 |! b
  ;; give the turtles an initial speed. b; D8 U7 c, q! K; F
  ask turtles [ set-car-speed ]; @7 {* D% N3 H# F6 @' o' l% X
7 ?, D) Y1 L3 Q9 h0 [
  reset-ticks
$ \, i! W# C/ n* ]7 F$ pend2 o( Y5 j( P6 Z- W8 u

( c+ U, D: \5 A9 A2 z;; Initialize the global variables to appropriate values3 }6 L! D/ Y# G% l) M" W) V
to setup-globals
) a# {4 G+ A" k/ H: `& M' H2 b  set current-light nobody ;; just for now, since there are no lights yet
. Q' X7 m9 p' n0 Q  set phase 0
9 e: u. I+ q! r, \# C  set num-cars-stopped 0
' e9 g& l% A6 ]6 k  t* m; g4 U+ I  set grid-x-inc world-width / grid-size-x, [* W' o$ Y/ i) P
  set grid-y-inc world-height / grid-size-y" x: e- Q2 X7 T& p

2 q/ E  r, @: v% _: j4 S4 H: F+ P  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 W( L5 U+ l6 @' q4 @( q& i. D  I
  set acceleration 0.099! N# e  B' a; J$ t7 u- s
end
7 v; K+ w7 k8 w  ^$ o+ ]" {
8 l& o6 u' A, }, C6 W% {' v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 q* f' N* k3 t$ Q! U! H
;; and initialize the traffic lights to one setting
; C& S8 h% U8 _/ L' N" `" x# dto setup-patches
! ~( c5 P: q5 F9 G8 J  ;; initialize the patch-owned variables and color the patches to a base-color0 g$ O6 |4 A) O; v. |: S# z
  ask patches
$ M/ n# v$ x. k. s! i( }- ]  [+ c6 p! q7 X. y6 B# Y
    set intersection? false
3 M- n2 Q. T1 g. O* J' {    set auto? false
8 Q, M# K# T' t$ T6 L4 w    set green-light-up? true
* U6 _( I# B( e- Y% A9 @+ E5 S6 {    set my-row -1
# Y2 s$ A7 }" \. h- X" u, W    set my-column -1
  c. n2 b5 B* c" N1 g    set my-phase -1
$ Y' g" _" \2 i( r8 b- g! n    set pcolor brown + 3- y0 n& f$ s* g3 n5 ^
  ]& ^' a9 F( t; Q3 U, d. N  w
& X8 t$ _; w$ u! |; s6 [! m
  ;; initialize the global variables that hold patch agentsets
( L2 n6 x5 `/ m8 x8 {. Y  set roads patches with1 Y$ s5 z+ z* Z2 s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 X2 w( A9 h3 P/ `: t# G! n& g- X2 ]9 `0 |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 I* f9 h4 l5 M  set intersections roads with) G) H1 G+ Q+ c; [0 Z; z; _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. w0 D8 T( ~- m4 I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 q& a* h. D* [) U8 h
6 h. x6 q5 m, M: V3 E- R, L+ z  ask roads [ set pcolor white ]& T' c) Z+ z( t( B! d
    setup-intersections
9 q9 H; A7 a5 f: i) F$ Wend
! U; n4 D% b9 l, T其中定义道路的句子,如下所示,是什么意思啊?; G" ?$ y0 T+ J, {# u4 _
set roads patches with; ?8 {& F+ v4 g0 s+ \  t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 k" l6 i( C1 M* Z9 ]! b# Z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 c" e4 \* G# h; j+ b' ]2 w2 U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, 2026-8-17 22:08 , Processed in 1.530276 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