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: 11077|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。
; p% s5 ]! w0 hnetlogo自带的social science--traffic grid这一例子当中,
. \7 _) `$ F. ~/ o6 U, }/ dglobals7 g" y. C; T* R* r
[) T' o( b% L8 E) b% R; }9 L7 b
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
9 ]9 ?. g: a+ q2 _  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" k: F+ U; g+ H. x6 {  U/ w& R  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
* L0 h! E6 V: y, J9 t7 C5 p; `                           ;; it is to accelerate or decelerate8 K1 F; a6 f3 Y7 A
  phase                    ;; keeps track of the phase
5 f3 O* `- |1 e0 u# U  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 N3 j+ k' J1 x' O- ~. Z3 G) n
  current-light            ;; the currently selected light# M8 ?  A3 j+ S1 f
9 B& N0 h) v" u/ T6 z$ J( Z, S9 D6 j
  ;; patch agentsets
( w. |3 h5 k& F! e  intersections ;; agentset containing the patches that are intersections1 v! M6 X! h* w& n
  roads         ;; agentset containing the patches that are roads9 v) d. m, T- M5 r/ U
]
% J* o/ }5 R$ o. O( U0 C. z) d9 L; a' j7 s9 ~3 F! j; R* _4 B
turtles-own
6 S3 [4 E) w3 c, u+ }, l' W[
$ f  I4 T% n* X/ e; N  speed     ;; the speed of the turtle# W: q- z" |% |$ F: J
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
+ @6 F1 e- V# k  wait-time ;; the amount of time since the last time a turtle has moved$ h7 _8 R4 X2 A. j% r1 b7 H
]
& r# i! s% |4 s+ V. V( Z8 K+ R: j7 |2 C( L! I
patches-own- o8 C" U- D# T$ S5 J+ A
[0 z: w6 \3 U* d0 x/ C& ?
  intersection?   ;; true if the patch is at the intersection of two roads
9 A( n' d8 O5 k& W. E  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
3 a7 M9 {' r! E& u! G                  ;; false for a non-intersection patches.
" o: W0 Q) {1 j8 d* z6 y  my-row          ;; the row of the intersection counting from the upper left corner of the' @, d5 C4 y# z$ I5 A/ R
                  ;; world.  -1 for non-intersection patches.4 V# H# b& Y9 B
  my-column       ;; the column of the intersection counting from the upper left corner of the* ?- ~0 f: V# C/ ]2 P* B0 a3 @* r
                  ;; world.  -1 for non-intersection patches.
3 Y7 A9 {! y: c  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
! O6 x- \6 c$ Q* F9 s1 x  auto?           ;; whether or not this intersection will switch automatically.
' @( q- L9 {: Y* R) @                  ;; false for non-intersection patches.
, d" G& ~3 s8 A]
8 e, W7 v+ ^" v6 \/ @  p
! M4 F8 A. i! t8 r  V/ l. J* m8 G" O$ m3 G" z0 z" z
;;;;;;;;;;;;;;;;;;;;;;( n3 x# s3 R& S8 y( S, b
;; Setup Procedures ;;  y. a! v3 M4 S0 c
;;;;;;;;;;;;;;;;;;;;;;
6 q! S" Y8 e1 D  G9 @! {$ k- `2 ~! H* W: ^
;; Initialize the display by giving the global and patch variables initial values.
6 ~* D" n3 ?7 `( A! T3 C& @;; Create num-cars of turtles if there are enough road patches for one turtle to( S& S  D% Y( o7 n
;; be created per road patch. Set up the plots.% o5 T4 m; X+ R! D9 H& G5 i
to setup
; ~/ j" H1 f; @' |' ~3 D* Q& j# a  ca
# Z0 t0 G! f  G( B% j" x  setup-globals
$ d; F  N  g6 z
8 H% E# q* m, N. V7 E$ h& H- F  ;; First we ask the patches to draw themselves and set up a few variables! ?" ^; R" B0 ^
  setup-patches4 r7 z0 p2 W, k) e# ^
  make-current one-of intersections
2 j2 N# ], N: {9 V9 J5 w# {7 k  label-current
8 F0 K& u# }9 o7 F' Y. b$ @
8 U; c, a: X- i  set-default-shape turtles "car"9 V: ?7 Q/ z! v4 Y  E

. g5 p/ d6 D4 c  if (num-cars > count roads)
0 w: d; z" \, _& n* N- ^( l& V  [7 g/ I, l) s/ y7 t, i
    user-message (word "There are too many cars for the amount of "9 v0 S9 s* o- A( }4 d. w) Q+ W
                       "road.  Either increase the amount of roads "
" q$ L5 P' c+ M% c9 p& @  n) {                       "by increasing the GRID-SIZE-X or "4 _8 [  z  q; r& c4 \+ C! a
                       "GRID-SIZE-Y sliders, or decrease the "
$ T' l# V) b8 N0 l                       "number of cars by lowering the NUMBER slider.\n"
7 v0 _5 A6 ^/ L5 F' T  |# A                       "The setup has stopped.")) g, ~5 v. c/ |0 [" h
    stop
- T' N* B" C3 e$ e* U* X& `4 s  ]
1 f+ U9 e: Y! ^. M3 b% S/ s7 X6 F/ c- W  v; W
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 P2 T6 e0 }7 |  crt num-cars# R/ O! W& v' b: W: T$ F8 R  d
  [
6 b% m; @2 P8 Z: W" U    setup-cars- [- `8 C2 D8 m( M1 b
    set-car-color
9 l2 o- \7 n  N7 Z# Y$ C' b: A5 a    record-data
7 P8 S3 w3 x" \6 s/ U/ ?( x5 o  ]
5 {" u. g! z0 R% o( |
6 q9 V% q. x# J8 v1 ?1 C5 F# u  ;; give the turtles an initial speed1 W. V' ]8 z* K! F/ ?. r! T$ I
  ask turtles [ set-car-speed ]4 `! h; F) M( L5 W& s
% z9 K5 h- ?+ \# p2 @4 D
  reset-ticks% p+ f4 X+ F/ Q5 v1 G5 s4 Q
end- x4 d* d  M1 [
2 f' ?' ^- s6 M6 O3 h8 _  Z
;; Initialize the global variables to appropriate values
- z; e* ~; x; ito setup-globals9 @5 d/ I+ Y5 W* o, a. c
  set current-light nobody ;; just for now, since there are no lights yet) V" r+ I' R: _1 {
  set phase 0
8 L6 W& @% s- I% \5 s: c* E  set num-cars-stopped 0
; s' ?2 N+ n5 O0 w  set grid-x-inc world-width / grid-size-x
4 c! J8 Y# o) f/ @  set grid-y-inc world-height / grid-size-y
5 x- _& v8 Y% _, P, g  I" U3 q5 t0 E6 \8 m2 ^2 U! F5 w3 i5 y& d, \
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 c/ \* b9 d3 K  set acceleration 0.099
. r; t) U. B- {: uend+ `3 y) |/ V  N% T( y6 W4 e

6 j' p: y. W. B  |;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% }7 ?% [7 w" [- G;; and initialize the traffic lights to one setting- n1 B. T3 q" c, k& p
to setup-patches* R9 u- U7 M1 t4 Y) z+ S8 `! S! N
  ;; initialize the patch-owned variables and color the patches to a base-color0 _3 J: {, u4 U4 J2 V  b
  ask patches
) b5 _  q( T; |$ j7 D: t  [
; d6 c" ]7 G1 g4 B4 m1 v! E    set intersection? false8 `8 [' o5 g0 k( p1 F1 A5 i
    set auto? false
1 G$ m  [6 |% X0 m3 V# s    set green-light-up? true
& Z: e7 [; ~( S; L    set my-row -1
5 o  x7 C  m: Y; m" S* W    set my-column -1' Q  n" ~9 [* o" N0 g7 l* l
    set my-phase -1- v8 `) J; {1 }2 h
    set pcolor brown + 3
* o, @% u$ V! v0 r9 I% L3 l) c  ]- O# c& T! n2 }: K0 o

, B* K) s5 ]7 u; c5 Y" I  ;; initialize the global variables that hold patch agentsets0 S6 p) ^+ N, c; m2 \+ e
  set roads patches with
- f2 a; @* u  X6 e0 ^    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ J# f$ @* [8 e0 H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 Q3 r5 @7 F" I4 }( j
  set intersections roads with( v' e2 _2 D2 ?  Y! F" D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 \. Q, j8 u1 D8 q3 w3 O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! ~! B* z5 \4 u. i6 K5 }) C; E( `; Y& H" F3 E' O1 Y% U
  ask roads [ set pcolor white ]
: p6 m3 p0 L7 ], n( D    setup-intersections4 V2 l) {* q/ J) M/ T
end
. l5 a( D8 v" a: S+ n其中定义道路的句子,如下所示,是什么意思啊?
/ G2 D1 D9 ]; P8 f) |/ E8 L set roads patches with3 X; g6 c  C- Q! A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" m" K  `" A$ k' c$ J
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; K. G1 D' o( |7 g, r
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, 2026-7-13 09:06 , Processed in 0.013460 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