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: 11201|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。
/ h5 E: O! f! d4 ~8 A8 vnetlogo自带的social science--traffic grid这一例子当中,
* C8 \; A! T, [globals! a/ ?$ B% a; j! P$ H
[
' g; V: T* A  g  grid-x-inc               ;; the amount of patches in between two roads in the x direction% C$ J# e7 ?% c1 `( ?
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( V0 Z6 b6 c0 v$ I) E& q$ U! G1 T$ ~- q  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ k* h" C7 A( F1 l9 L( m                           ;; it is to accelerate or decelerate  P! H4 J* p: m/ S
  phase                    ;; keeps track of the phase
( _" y4 L7 {! F0 t1 d  Q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure" f. p- D) X5 A+ b4 n& j
  current-light            ;; the currently selected light* O* T  g- D3 n3 t. N+ N

2 s* h5 S9 ]6 c& A5 ~  ;; patch agentsets  p# O% A5 M; k5 v
  intersections ;; agentset containing the patches that are intersections
! Q8 G/ s  t! A7 u+ G0 D& T  roads         ;; agentset containing the patches that are roads6 `' R9 X1 C/ }, c1 t3 @
]
: \$ J- J2 D; \& E2 R* ~3 O+ x* d
turtles-own7 p7 j1 e- J# `1 ^* P
[
1 T7 V! x" h5 @& d/ a$ e  speed     ;; the speed of the turtle: X$ `' h- H) E/ V+ b' Q1 ]
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right3 z, s% P' d; E0 Z5 d. J) E* _
  wait-time ;; the amount of time since the last time a turtle has moved
9 i# l8 g6 D  O" d3 b4 h]
/ m9 R( q  {4 y/ V6 S$ m
* M+ T) W" F2 H% @6 @patches-own( j  [! e0 X9 V& S4 H% T7 s. r
[
) @9 j. a2 D9 ~! ^  intersection?   ;; true if the patch is at the intersection of two roads
+ a" W& G' ^4 |. k! R2 [7 R: s  green-light-up? ;; true if the green light is above the intersection.  otherwise, false., r0 V/ i! P6 i6 @. O4 d5 G5 J2 s
                  ;; false for a non-intersection patches.
; b/ B2 n( a+ f8 t3 M- U  my-row          ;; the row of the intersection counting from the upper left corner of the- Y3 M6 U, U# ~# V
                  ;; world.  -1 for non-intersection patches.
2 a" \! B3 ]. v' e; b1 [  my-column       ;; the column of the intersection counting from the upper left corner of the
2 R& {% W4 ]9 A                  ;; world.  -1 for non-intersection patches.9 ^! ~* y4 Q) g7 T- Y' Z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.  f9 `: b4 b" p. X6 \
  auto?           ;; whether or not this intersection will switch automatically.
* D, I: z' I2 u$ \  L/ g$ {2 i                  ;; false for non-intersection patches.
' N! o; p0 S, W: M]% U, {+ i% B  [) P6 L
' j4 s+ p6 h: }9 r7 V/ I# P

$ q( i; T% n0 k# S: t;;;;;;;;;;;;;;;;;;;;;;
$ Y' z0 t# o1 x; u$ z& E: D;; Setup Procedures ;;+ s' M& F4 S' V7 @8 }* b
;;;;;;;;;;;;;;;;;;;;;;
$ I  c  ?6 g0 d5 E. H/ B. n
: q% i0 x6 p8 K* v. V; k9 p. a;; Initialize the display by giving the global and patch variables initial values.& ^- z' w% i8 U2 w6 K7 l0 L( J
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 y7 N9 ~, z, s- d7 E7 \! R' B  a;; be created per road patch. Set up the plots.
4 P: E$ Y& T9 d" H  ito setup* E& w6 R# r+ D; Q' Y" A
  ca# b$ H0 C5 C' ~3 E
  setup-globals9 L$ e- k* s" e$ D  |  @6 ^
  x, |( s- H. M& m; |/ z, x# X# Q% C
  ;; First we ask the patches to draw themselves and set up a few variables
6 b3 o9 a" b7 G- B  setup-patches
/ T. z0 H( Z0 C+ O6 n) d, k  make-current one-of intersections
/ y" X5 ]" P' A2 V7 F( m  label-current
6 w8 A8 w1 N! Y' L( n; w- [3 l
: [- u* H1 b7 Q8 p' j5 U1 M/ c  set-default-shape turtles "car"
2 [, |# d" u$ I: ?$ ^7 |
3 V0 c: f. H0 e% |5 E# Q% B. j3 V  if (num-cars > count roads)7 y8 L8 ~0 M+ ^8 F
  [! z" z  Y1 |4 Y5 Z2 u3 w
    user-message (word "There are too many cars for the amount of "
' x* G# L  Z! h* G                       "road.  Either increase the amount of roads "
* R; P  R: D, n/ P( n                       "by increasing the GRID-SIZE-X or "3 A. P3 u* O2 M9 s7 j3 E
                       "GRID-SIZE-Y sliders, or decrease the "9 e  h; V# }0 L- i4 v; W$ n
                       "number of cars by lowering the NUMBER slider.\n"  d$ \$ j3 T# ?# }' ?
                       "The setup has stopped.")0 V5 ~4 \: y5 A+ S2 F0 ?
    stop: I: L# x. _% J2 j  F! C" F
  ]1 u6 f4 }( \$ s9 S5 _. K! o5 t( Q2 d
4 T# ?- Z. M, z
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 w* x& X: O( D( i; ^# ?: |* e
  crt num-cars
& B9 b+ d' Y: n  [
) B6 p3 j7 C6 ?; C    setup-cars, o2 f% Q3 v0 M7 L* Z
    set-car-color
6 |+ U& f  u" n8 {  t) n. K    record-data1 f, g: e% \) f, K
  ]
; m0 t5 f7 {* N8 ]; {
, v7 M( q" k. c; w- J: O# a% h  ;; give the turtles an initial speed
% _! V* z  R, t" _8 ]2 |, \  ask turtles [ set-car-speed ]
0 @0 y% ?5 L' C. o$ X1 N/ b
" N" }1 y5 F+ S, e  reset-ticks/ I. n* o" R9 [: o, c, G
end3 [5 n4 w9 r% W' ~3 I

, P! O- x9 ]3 j* ]& A3 Z;; Initialize the global variables to appropriate values3 x- r! `" ?& Q* r& o) D
to setup-globals" u. F! T( L" O& j7 x7 X' W& G
  set current-light nobody ;; just for now, since there are no lights yet, ^% A& S& S# M* J5 b
  set phase 04 S# G5 S) ^  S
  set num-cars-stopped 0
! f% a3 @: j! m) b6 h  set grid-x-inc world-width / grid-size-x
) ^0 q% s( m; X2 E! Y) {% _6 L  set grid-y-inc world-height / grid-size-y6 W2 ~. j; G$ K: `* l3 S" F
; N2 i& z  Z6 f) }; u
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary  C7 s1 Y5 B: s% }# S
  set acceleration 0.099, a) }3 x* d2 ^
end# P! [+ f+ y& S* M# T

( [! F. T* U2 I1 N. M- @6 X: P;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 ]9 i) W, N6 A4 }1 Z5 Y;; and initialize the traffic lights to one setting! B! u9 L: j: J( f7 D2 w
to setup-patches8 A/ o6 e( L" v2 R' W' Y9 h
  ;; initialize the patch-owned variables and color the patches to a base-color7 `2 e# X' z' r) O+ c
  ask patches
* u4 ~1 `5 x8 D2 v* F6 d  [
) Y; k/ p% N. t* d( a9 p8 X+ o    set intersection? false
( [2 X* Q3 `5 a9 W    set auto? false- s  y. q2 V) o+ `- ?# U# R
    set green-light-up? true8 _+ L0 t6 W$ ~$ U: y
    set my-row -1
/ A8 i. P- C- j0 m    set my-column -1
: X) h: r( I( j+ h7 m    set my-phase -1' ~, N* |4 b' @% k4 y" L
    set pcolor brown + 3$ M+ X% s( p5 Q* \" s
  ]! `& c4 e7 G1 p# f5 A% t0 i. d
3 y* q# D  H5 q3 m1 Q3 K2 A
  ;; initialize the global variables that hold patch agentsets
/ N; ?, E/ l5 y, g: E- I  set roads patches with
- k3 e' B( v2 N9 z1 ]    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) w8 Z: v2 a1 z3 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  Z( n7 d6 Q0 |, n* A! P
  set intersections roads with
  q" Z# k/ Q2 t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; [, \: X3 u& |9 j* r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" Z; n% V: S" n7 A
  ^. {: h2 ]# |" n. m  ask roads [ set pcolor white ]0 ?; X5 r: j( U- l+ i  ?7 i1 g
    setup-intersections
# j; a3 `# |5 e  C9 cend" j  o: r' `2 `6 Y) {
其中定义道路的句子,如下所示,是什么意思啊?
( I! a. A* S6 U" d  | set roads patches with
4 C# P+ h: e: n3 x    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, `' s# U4 a; @8 V) J/ H# s* z/ B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- _1 W9 x/ q( b  t
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, 2026-7-19 02:55 , Processed in 0.019443 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