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: 11647|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。% l$ W" l: k! V! d3 y- F' t
netlogo自带的social science--traffic grid这一例子当中,
& Q9 J. S" i+ N! Gglobals1 }' j9 }& ]( y5 h
[
6 {# ]  ^# S5 F  grid-x-inc               ;; the amount of patches in between two roads in the x direction0 A" b" f* x: z$ k2 x# m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( K  J# m; @" w3 a& Z2 g0 H  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  R/ s8 g; B1 c: B: K+ q/ F0 ^7 n8 u! l
                           ;; it is to accelerate or decelerate
* f/ G7 u4 i* Q8 p/ T  e0 Q- h6 B  phase                    ;; keeps track of the phase( P% M6 X1 B! X$ K& ?& c
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& l( V# v: {/ B9 z! V
  current-light            ;; the currently selected light8 |8 h" E5 E% K% b% r0 k

& z. O" j* I, {+ F5 t! o  ;; patch agentsets
5 C% X( o: L9 {# U, H0 d; o  intersections ;; agentset containing the patches that are intersections
; Y/ s7 I5 U$ u& k  roads         ;; agentset containing the patches that are roads
8 m3 J" ^$ B5 h! A" n]4 |# g% m2 W' D" x8 R/ A

/ ]/ w! t% J: o2 D- fturtles-own
" t  F; h1 f" v2 _# u% }[: u) h  p0 y: C( P, ]: v
  speed     ;; the speed of the turtle* S0 _! a* |( j; N0 E) I; [4 }
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; X4 J6 _  g  F. h, c  wait-time ;; the amount of time since the last time a turtle has moved
( Y' |8 ]( Q1 X]; i3 ?$ ~2 O7 X/ r, [$ I, v

1 B8 u# h9 r) }* g" E, Fpatches-own
4 H4 |) n" x2 O1 I0 G. @( H* C[
4 K3 |1 C# n$ x7 J+ ]0 F5 M  intersection?   ;; true if the patch is at the intersection of two roads
8 {- b4 _- F/ g, w$ a( Q  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
8 Y- [; c  {' |5 y                  ;; false for a non-intersection patches.( E% u. ~% T4 d) W" [* q6 J$ D
  my-row          ;; the row of the intersection counting from the upper left corner of the4 \- W$ D2 S0 x! O. c6 A. {
                  ;; world.  -1 for non-intersection patches.
0 B% R5 U5 L1 A/ H  my-column       ;; the column of the intersection counting from the upper left corner of the. E9 T; f6 k/ {+ l! h- ]4 a! q( C
                  ;; world.  -1 for non-intersection patches.
" P* @, m* M9 U, N; E% V  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
( ^6 @/ k& u& R  auto?           ;; whether or not this intersection will switch automatically.
0 b0 O: j# m$ D( R9 S                  ;; false for non-intersection patches., R$ ~; T8 C- H/ G* z  {& Z' x
]
, k9 N( [% b. ?  t! i* [
3 x2 F) a/ ^. J. h0 U
6 e: E2 n) g3 v! v! w;;;;;;;;;;;;;;;;;;;;;;
# X! M/ g# e; i9 l/ [;; Setup Procedures ;;
+ ^# v0 U6 o8 N  u;;;;;;;;;;;;;;;;;;;;;;1 Y; F5 g0 K% o4 q1 a4 y
% _5 }; p! S0 x  G4 H% p
;; Initialize the display by giving the global and patch variables initial values.
8 G: n# Q& K" a0 Q2 K;; Create num-cars of turtles if there are enough road patches for one turtle to
: t* s6 l8 E' E' a9 H# |. i;; be created per road patch. Set up the plots.
/ s9 a$ b7 j+ ?0 J: \to setup  ]7 k5 K: n9 y0 \  m4 R
  ca
' ~& z/ m: C# G, h9 w0 F8 k  setup-globals
1 Q( ]' B: I1 T- f; H$ J% e- t; r- i) x; U
  ;; First we ask the patches to draw themselves and set up a few variables  r( d  L1 F- h& O2 p2 h, P. f
  setup-patches) {6 ^) X  _& J  v
  make-current one-of intersections
; f: U% ]# k& j1 Q+ n/ n8 c  label-current! @  g  D/ P* @6 y# b
$ A+ X2 B. H; r, R- N- B  |
  set-default-shape turtles "car"
7 e* ~5 |% w* h# ], ]4 j4 N) i4 h
  if (num-cars > count roads), K% p  N0 K" \6 A/ R0 `8 H- M
  [& _$ N2 Q1 B9 L( T
    user-message (word "There are too many cars for the amount of ". z. E2 U# }- W. L* C+ g7 ^$ k
                       "road.  Either increase the amount of roads "
3 E; b# U9 b+ M                       "by increasing the GRID-SIZE-X or "
5 q  [" ~# f# V+ ]                       "GRID-SIZE-Y sliders, or decrease the "5 F- L* j6 r+ }3 F
                       "number of cars by lowering the NUMBER slider.\n"
( Z4 h# Y/ K9 y- R: A4 G6 k6 E                       "The setup has stopped.")
# u% `. V! c- F/ }- U3 b. }1 D    stop
' O& F  s/ H( ~$ ^7 r  ]
+ Z3 T# A1 w6 ?, k% a) v- V
/ c4 ^0 R( T7 |; R/ j6 x$ I" V. k3 M  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ i& w" M7 [4 I7 ^( {8 |+ o4 Y1 J
  crt num-cars
8 s  u9 P6 s2 Y5 ^. ?  [0 V& e9 Y# n" v& L- W, y
    setup-cars
4 o/ P- y& k6 Y4 l+ e* m; R; f    set-car-color
/ [* J8 z: t2 K4 N, X, X* F8 q0 \. }    record-data
$ w1 D; X1 S, K2 J1 b) f: I" E+ C0 F  ]. M% ^) q0 e* @2 r

3 H- Q- l6 @) W+ t; x' ~  ;; give the turtles an initial speed
5 i1 }5 O7 Y5 N7 {3 `  ask turtles [ set-car-speed ]) Y+ x5 Q; P# W2 N, P
* d  M5 ?' _/ u4 w/ m8 D) i9 y
  reset-ticks
! ?% B) ~; a4 [9 d+ A4 a8 Oend6 l0 R, ^0 a$ G! p) S
! |" W; {" c( i6 o0 o
;; Initialize the global variables to appropriate values
/ O# M: Z) z# dto setup-globals
* M& U: t2 s" r7 H  set current-light nobody ;; just for now, since there are no lights yet/ n" k. Z* M% O
  set phase 0
: Z! P# g* I2 G& @  set num-cars-stopped 0
6 ?5 R/ e- f$ b! [7 D, C  set grid-x-inc world-width / grid-size-x
* V6 a4 z8 q5 z! y0 ?  set grid-y-inc world-height / grid-size-y
( k; B: B5 O* S+ @/ }8 J+ M3 t5 L8 k. E4 C
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ E9 g) c6 ], i
  set acceleration 0.099
* _/ P  |0 M' i! N( Bend
4 N4 x2 ]. R& y0 E0 i
/ e$ G* O- a5 c;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 T1 C& Z+ v7 U( q. ]  x1 A- [0 ]* M;; and initialize the traffic lights to one setting% F/ l3 b+ g5 v1 W7 e3 \$ c
to setup-patches0 Y  w4 C* O6 l( @4 K; T
  ;; initialize the patch-owned variables and color the patches to a base-color/ P9 j% a! L) H8 `, S4 H$ T  D4 i
  ask patches1 _) T% F5 y; _3 F
  [- L. v' b# c1 W' E
    set intersection? false
" m" F4 O' Q: _* j/ f& n    set auto? false
2 `" {+ L5 w* m3 g    set green-light-up? true
7 y6 n- P, @! r" y    set my-row -17 L1 O6 ^: j$ _& L' L$ S+ R
    set my-column -1) s6 Q7 {  D2 I0 T5 q# f
    set my-phase -1
) c. a2 t. y5 H/ t1 [" o* s5 I' r: @    set pcolor brown + 3
- z) d5 o5 P! \3 Y: x  S* T  ]# G0 T! G1 R+ V5 g+ `0 j6 t

2 I: X: X9 e2 w& Z  ;; initialize the global variables that hold patch agentsets, k& R8 r6 {( E! p
  set roads patches with$ N) P; K, i/ d$ b6 B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 O& b' r2 a$ N- s% z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], F2 B" O- r7 `6 g
  set intersections roads with
% M( R2 ^' }4 c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 ]0 I/ t! c' j5 g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ p; b9 r  C  H, p  |

0 I: q* v$ v2 E3 B* z! @  ask roads [ set pcolor white ]+ k) b$ t/ x1 A3 m2 e
    setup-intersections3 K" @8 j6 }) S
end
* Z! I1 P/ \0 L( M6 d9 S其中定义道路的句子,如下所示,是什么意思啊?
4 H! l2 A3 i- N set roads patches with
5 b" Q& o. t+ U# x1 n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% U# u8 P. F5 R" H4 u* A    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& H7 F9 h2 Y, L+ ^8 {% n
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, 2026-8-8 18:11 , Processed in 0.014832 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