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: 11223|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。
0 l, k6 U. S  onetlogo自带的social science--traffic grid这一例子当中,
7 K. K  ]% X8 e  \globals6 C; l! d1 Y9 Y" J4 j
[! S$ |* S; E. M6 a& s
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! n: e! P7 W) H! z5 G* J4 z  grid-y-inc               ;; the amount of patches in between two roads in the y direction! |  f& k' R3 {3 e4 u
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
( S" l/ {9 S9 p* G" T7 }                           ;; it is to accelerate or decelerate
! s5 M+ f5 A  T0 }0 k  phase                    ;; keeps track of the phase' E$ `1 h1 f# G. L4 C6 i: q8 C  ]/ n4 |& Z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure) D% i- |, c: t% o: Y- U/ x1 c
  current-light            ;; the currently selected light
3 g8 j! q6 p% U2 f4 ?
* e6 J. f/ C/ {- ?! {2 B, w  ;; patch agentsets
9 L' M/ c1 I% J/ f: R, E& o  intersections ;; agentset containing the patches that are intersections
9 |! x0 l$ l& u  roads         ;; agentset containing the patches that are roads
4 L' G2 r2 E8 l9 D: L0 k]" s; K7 U* I. R! |2 x

) {) z% Y; j( _$ {& Z: Z8 Z* }1 M# eturtles-own( B* z) }" A  E; o2 i8 _9 ?
[
8 G3 B) K* I  y. ?6 j) z6 c& L  speed     ;; the speed of the turtle
3 u6 L  G, y0 q8 V' W3 j* H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right, C" d/ O' N0 E- u0 G3 Q! @  {+ p
  wait-time ;; the amount of time since the last time a turtle has moved
9 S6 p3 h4 T3 g# C" y]
2 ^0 M! S7 s& |, }& a3 A$ m
* m: W: S' B/ r$ l& Cpatches-own
$ c' A+ B% b+ {4 @9 q[
- \! ]+ P! ^& i- J  intersection?   ;; true if the patch is at the intersection of two roads
6 v, Q* Q$ t6 w% z9 ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.: c: |1 o* F9 Q& R7 L. }+ m# c- y
                  ;; false for a non-intersection patches.
0 z: t; r: l! W/ D5 B/ O! W  my-row          ;; the row of the intersection counting from the upper left corner of the
( f/ j) q$ G6 I/ J- Y" N                  ;; world.  -1 for non-intersection patches.% ]( T/ _" D. j
  my-column       ;; the column of the intersection counting from the upper left corner of the
0 `, S, u+ N3 z6 T9 m- j                  ;; world.  -1 for non-intersection patches.
' s& K6 W8 B9 I8 J( G: U# _  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
4 e1 }+ r8 K( R' |1 l8 X  S  auto?           ;; whether or not this intersection will switch automatically.4 x& B9 \5 Z: D( R
                  ;; false for non-intersection patches.
( _" s% F- ^) e0 q]
3 C; J6 W+ C0 E" m; m* i0 a+ ^3 M! b, V' i0 l9 O( k# M6 V
6 [0 D3 q( V3 m
;;;;;;;;;;;;;;;;;;;;;;
+ @2 y  [3 G7 ]$ T& D;; Setup Procedures ;;
) Y1 E' n0 v/ `; n;;;;;;;;;;;;;;;;;;;;;;2 i) k) l5 z% Z

0 ~# {& w1 F2 _* l( B; T;; Initialize the display by giving the global and patch variables initial values.6 S1 [+ W1 T4 q; @
;; Create num-cars of turtles if there are enough road patches for one turtle to# j0 p" r) k6 [# ]$ M
;; be created per road patch. Set up the plots.- i0 R" c* P, o& U3 c$ a2 X
to setup
  C3 j2 K# N/ E. n: A% A  ca+ v. U/ H$ k6 m1 d1 l4 G
  setup-globals
0 I. b; ~' H; ^+ @3 }# R" X1 h
  ;; First we ask the patches to draw themselves and set up a few variables( O! ^2 J2 q3 t9 m/ J! _
  setup-patches7 b, `+ R' Y* }8 r
  make-current one-of intersections
! c! I5 O; Z" g& X! @  label-current
) B; Q( v' L- P; [: ^+ Q' d
& I2 @" @& N0 L2 m$ @# {9 q" i  set-default-shape turtles "car". I3 R3 R3 [& D3 c# ^

! |! K! |9 W+ R1 F& S4 a  if (num-cars > count roads)
( F& a/ s- X& f7 i5 s9 u3 E/ E  [4 _- [) q6 S( T, X4 g
    user-message (word "There are too many cars for the amount of "& p3 Y6 T, P- g/ n/ e
                       "road.  Either increase the amount of roads "$ ~: V  X6 u5 [. k
                       "by increasing the GRID-SIZE-X or "
: }/ U3 R4 N+ G" Y/ y' s8 }- m# M                       "GRID-SIZE-Y sliders, or decrease the "  E0 ^& ?% L; N! H
                       "number of cars by lowering the NUMBER slider.\n". d( c, O% D/ |5 g0 m8 ~! r
                       "The setup has stopped.")5 h) N# O" S% o# k5 I# k
    stop
0 B4 j& j0 `' b( o  ]
$ i  ?' [) V$ l; L7 \0 A
3 q* O! E4 R$ g# s% R  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 m/ F5 I1 m6 c/ b
  crt num-cars
9 _3 m' h, V" T3 {9 R! i" {  [
5 g' C1 l; L7 _+ v6 k* X! x    setup-cars
. ~$ m" k! P1 a    set-car-color
$ d# {& X9 m! o  }9 u" v# f1 o    record-data
2 a# \3 L5 H6 o  ]1 V5 [; d( s3 ^3 p2 ?( L
* _/ p8 @' B! G1 Y9 h) c9 R
  ;; give the turtles an initial speed
; {5 w& l, p' ^4 |, w( g  ask turtles [ set-car-speed ]5 z) d; f$ P6 \* r# j
; M/ w* G$ `6 C/ n
  reset-ticks
$ [) n! `9 n% ~5 a+ x5 Dend# s! `- `: S9 C1 \

% ?, L* l9 f6 @' e( V;; Initialize the global variables to appropriate values
5 F$ S  e: n% A4 R9 V  {  S. s* @to setup-globals
$ f* f7 m  k- ^  set current-light nobody ;; just for now, since there are no lights yet
2 ~. v3 o. `% G2 b  set phase 0$ g0 I; x3 z- b' ^
  set num-cars-stopped 08 d" B/ f5 W6 U( h
  set grid-x-inc world-width / grid-size-x
  U% E5 H3 p+ Y  p  Q% x6 e; A  set grid-y-inc world-height / grid-size-y0 Z8 j0 Y! O, L) J) |. ]; W2 R
+ i  x% p5 x) q: n
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) ?: D* a" B- s* {  Z6 l: A  set acceleration 0.099+ C9 X/ I1 J: p9 C
end
6 Z$ l, w% L. X, L: }# q- U! H+ u
% J6 W% Q7 v* g+ y) c4 m8 g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( q+ q, ^0 \6 [3 f- L3 D+ ^- i;; and initialize the traffic lights to one setting
4 n2 U( w" i0 }$ n8 p* f+ o' Mto setup-patches  N- W3 ]' M. J6 k
  ;; initialize the patch-owned variables and color the patches to a base-color; C! |! }4 w3 `# M1 G( }
  ask patches
7 X  D( I8 b2 a8 [5 ]( }  [: M( C, l" l6 N) E* i
    set intersection? false
. C5 u  B. D$ d( F    set auto? false
, h- `7 z% b8 b' ~: O" e- j/ y8 [    set green-light-up? true4 s7 H" j- I8 ^$ u
    set my-row -1
5 ?; O" f& ~3 W& a+ E! D4 k    set my-column -1
# j0 I5 {  X: t% T    set my-phase -1" v. h+ v) y3 b0 I, \- C! j1 H* q1 q
    set pcolor brown + 3( L; f- n* P# t% B+ a3 Y
  ]
8 `) S0 R2 @0 ^) U# v
. t* c( W5 X; @  ;; initialize the global variables that hold patch agentsets5 c  Q6 P( D' l
  set roads patches with" n* h. n+ o; |% y" |# ~$ E. F' a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 H5 U6 d: a4 c' @! f4 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: g4 X! t1 k& h4 {6 y  set intersections roads with
/ A0 B6 A% S& v. R7 ]. Q, N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  ]2 w# {3 z) |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* a; w  \* p% O/ B% D* n

; {3 A- Z, N8 \4 K# u  ask roads [ set pcolor white ], v5 n0 S- J: K
    setup-intersections  t& _; H! Y0 C
end
; x* S4 ], L) x. |' T其中定义道路的句子,如下所示,是什么意思啊?1 Z2 F; @! Q; V8 E" [$ X+ V4 ]
set roads patches with* e% Y( Y, e9 G" M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; s4 h9 R: m3 F2 C; ~1 r8 F1 Q    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 E1 V. b2 O4 y& e% ?
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, 2026-7-20 09:50 , Processed in 0.013518 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