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: 8203|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。/ N9 R# R' y/ p9 |
netlogo自带的social science--traffic grid这一例子当中,3 F8 \6 i; z1 d/ q4 A* |6 i& u
globals
* E# y7 |" E5 @8 K; ~" L2 p! q) O[
; w' h% L) n; g* P  grid-x-inc               ;; the amount of patches in between two roads in the x direction
& l  F1 X" k7 N& r7 l  grid-y-inc               ;; the amount of patches in between two roads in the y direction
, x. [( l2 R3 E& Y( f* W) H  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 {/ B! Z& t: j2 K* W& G/ y
                           ;; it is to accelerate or decelerate6 t, m- g! I9 }+ q
  phase                    ;; keeps track of the phase
! y) l# q7 N) z% Z: I+ B: c" F4 L  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; v3 }4 Z; |3 ?. L1 z
  current-light            ;; the currently selected light
4 I4 o9 V; N# n' ?) k7 }( `3 v- |, I4 K# n+ c0 p8 o5 u$ q
  ;; patch agentsets
2 |9 u6 F. {# E1 _7 y' {0 M  intersections ;; agentset containing the patches that are intersections& ~( ]$ Q6 x. Y0 X
  roads         ;; agentset containing the patches that are roads  l7 j2 D# v% v9 ~4 C) J0 g9 y# ?
]
, {7 c( \- t8 _
% j6 j5 l/ p+ e( j) vturtles-own2 U+ ~- t: h6 U
[  z. p9 m( \1 ]
  speed     ;; the speed of the turtle
! y6 }( Y! I  r  z( B  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  c9 y  `! \) q7 ]* S& u  wait-time ;; the amount of time since the last time a turtle has moved1 ?+ W) |* d, s2 D6 ^( F2 b4 K$ D
]6 ?# X3 S) {+ {# d( K" y
( e$ n. [. w& W9 J
patches-own+ _8 z7 l; u' Q; u: Y
[' `3 N4 X6 ?* u, z
  intersection?   ;; true if the patch is at the intersection of two roads
9 e, c  G4 a6 J/ l# h9 {5 f8 t  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.$ u, w3 C/ D$ x9 B
                  ;; false for a non-intersection patches./ g# D* M5 t3 A/ y! z! e
  my-row          ;; the row of the intersection counting from the upper left corner of the
+ G. r. g) [( w- ~- k) L0 G$ p                  ;; world.  -1 for non-intersection patches./ [2 F  A+ R& D- i5 A8 Y# n
  my-column       ;; the column of the intersection counting from the upper left corner of the3 F9 z5 M% v- X' U8 R& O
                  ;; world.  -1 for non-intersection patches.
5 C3 r+ R7 F% X* q8 @$ F  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ `# A/ F% ?( B2 w! q6 i  auto?           ;; whether or not this intersection will switch automatically.
+ C" e1 N% u8 l6 g0 t+ I                  ;; false for non-intersection patches., H7 t! @, L3 |* X3 Z/ [3 G) v7 c2 i/ P" K
]
! U# Q7 q8 T3 ^3 n: E( X; p. c9 x" q
( _9 B0 Z0 k0 Q/ I
;;;;;;;;;;;;;;;;;;;;;;5 F8 P% u0 U2 Q. o# X
;; Setup Procedures ;;! i7 ~: i: r9 K' @) U
;;;;;;;;;;;;;;;;;;;;;;# Y) V5 |# ]3 {( Q0 E8 r. w4 u

4 X$ L! c& [8 r' H" f2 S8 v;; Initialize the display by giving the global and patch variables initial values.
" v1 H; |$ u' w. c$ o;; Create num-cars of turtles if there are enough road patches for one turtle to
2 w1 s4 ]1 p! s; j6 i" X! A: u;; be created per road patch. Set up the plots.1 i- s, G1 F! m9 M* D
to setup
9 {! I$ j9 T* U3 K1 Y, o  ca
) O1 f) m# ^& E) z1 [  setup-globals
$ _0 D6 V. ~" P, O. A6 Z" W4 I/ u+ s. A( L! R) d
  ;; First we ask the patches to draw themselves and set up a few variables
$ K. y2 e/ B& v/ b) P9 @  setup-patches
  c, j4 `7 r% \% C( ?9 D/ f2 a/ ^  make-current one-of intersections
1 m8 L' X4 j% s( a8 z' p0 d# b. Z: n  label-current8 E$ G* d' ?+ [% S
, D  }& w8 J% z/ J  a
  set-default-shape turtles "car", w0 ]+ W. j4 Y; N1 R7 a
# b, N) `6 c: x0 q
  if (num-cars > count roads). o% T8 [1 r4 a# ]5 ~6 l
  [* W9 @9 i4 b! Q3 ]
    user-message (word "There are too many cars for the amount of "
5 k6 R! Q: Z. k                       "road.  Either increase the amount of roads "
  b- H3 q% e8 c  \) \                       "by increasing the GRID-SIZE-X or "7 h$ \/ \5 B# \* p3 T
                       "GRID-SIZE-Y sliders, or decrease the "
% J" o& S! J! d6 t  E' |                       "number of cars by lowering the NUMBER slider.\n", L) y2 t9 V8 }5 R5 C
                       "The setup has stopped.")& A1 H7 E9 z4 v5 }3 C# A3 b) B
    stop( r) Q# M$ y$ a% |6 f
  ]8 @7 h. f3 O2 g* v) @$ ?6 _; [+ u

% P9 h) k# K0 M, r+ J5 f  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 Z* x( i2 v' w& z& ~% f+ n  crt num-cars
4 {3 b* D; T! a% L8 w) `$ A  [
  _. V* R6 ]: u. z9 z    setup-cars% H8 O* p0 N* E& g, ?
    set-car-color- _( `6 `# F: n9 k: T5 q
    record-data
! x3 K+ n6 Y5 M- }+ m  ]: w, ~5 O6 O6 U( d5 q4 d; W
- S  L! i, S$ d( E% I
  ;; give the turtles an initial speed' z% p7 q$ `4 G7 U' q
  ask turtles [ set-car-speed ]
6 L) E( `6 L" q( u& ^; S. \  ?, C& k+ P+ O5 z9 Y9 K- s
  reset-ticks
+ F9 q: Q2 k3 S6 q+ }3 m: |end* x$ N9 I/ a3 v$ a! q6 a6 I! I
. D( m/ B4 Q  e/ z! W0 }2 p
;; Initialize the global variables to appropriate values, q1 S8 v: N% z. x0 q3 i1 h* G$ c- Y
to setup-globals
$ O& s$ s& N1 K  t  set current-light nobody ;; just for now, since there are no lights yet
+ E/ J" c. @' U: m& `5 F  set phase 0
5 w) s- p4 I) I& X) {* p1 c  R  set num-cars-stopped 0- V& u/ c2 N, S, y
  set grid-x-inc world-width / grid-size-x
! |$ Y' b$ f; D5 Q  set grid-y-inc world-height / grid-size-y
% {* g. r" G, z
5 A- }' B# f% a7 W% H5 p  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 F- a, g2 p& |' C  set acceleration 0.099' ]$ a2 H' b  V# l5 U. w, |
end" n  B6 o+ a- [2 n) f" }
* v8 [0 G  C5 D* A+ b4 [5 [* f
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% `9 }$ H3 p# [8 y+ Z8 y7 K- ]
;; and initialize the traffic lights to one setting
, L" u5 j+ D9 Wto setup-patches
$ N: @! {$ a  L  ;; initialize the patch-owned variables and color the patches to a base-color: u# k' w* v0 }" F: x
  ask patches: F. i( k; A, @1 y  I/ C
  [( Z# H* Q9 z  B) d) `. T* ^
    set intersection? false
# V* y7 ^" Z3 [1 ^9 f  U    set auto? false9 D& z' e4 v8 R0 ^% L4 e
    set green-light-up? true
6 u; [, Q2 m  [; P9 L2 w    set my-row -1
* `  b) U/ f# d8 [4 S    set my-column -1
: X; g" u( O, d( ^. e    set my-phase -1; g  |7 @! s! f' L, `
    set pcolor brown + 3* p/ I7 l) D& M5 }) A2 Q8 U
  ]; @7 o3 t) {1 F$ y6 z
' Y+ e, q" q4 o4 _# T% y5 O- z/ y
  ;; initialize the global variables that hold patch agentsets( s4 s/ m0 v8 @. B1 T* Z( O
  set roads patches with
& Y/ N( D2 z( k5 F9 q) [: S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! a# E9 q0 c8 u" F3 W% ]8 D2 S6 o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 h( }- q& t& K( Y/ u; W  K
  set intersections roads with
/ a" `2 [- B/ g7 _9 {% T    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) N, ]3 i1 z; b2 |, I1 S) p& D' m
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], N& D  c# l& ^6 W- U3 ?% g

" i# [) `% k) ~; @  ask roads [ set pcolor white ]
! W. y' h8 Z* \2 ]1 x    setup-intersections# T  e: p+ z7 q* @" |
end
! W6 z. K0 Y7 y1 P其中定义道路的句子,如下所示,是什么意思啊?& b8 |5 ^) r- a4 g
set roads patches with
# G# p/ {7 R5 u5 z" t5 f- L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, F+ O6 E8 E' t4 O( B, i
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 @8 J: ~5 P' l0 E5 v) k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, 2026-2-6 07:14 , Processed in 0.018347 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