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: 8701|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。. b: D: @  C, _6 Y) L+ Z
netlogo自带的social science--traffic grid这一例子当中,0 Z' u2 J4 W/ \  D% ^5 t7 c
globals- O3 }/ q8 z/ o, \9 {" e' [
[
6 J% d9 a, H8 O! Y  grid-x-inc               ;; the amount of patches in between two roads in the x direction# p+ W: A3 f( z% n: j' d
  grid-y-inc               ;; the amount of patches in between two roads in the y direction( N8 t; s$ I+ K! C- S2 K3 t
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# C& ^, |& K6 r6 r1 X5 k2 C# c  ]                           ;; it is to accelerate or decelerate; U/ I$ `* B! \6 h5 c0 U- R' s/ h0 j
  phase                    ;; keeps track of the phase
# w* F* x7 \  [$ u: h) K- `+ I  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure/ y0 f- x5 |, b- v
  current-light            ;; the currently selected light
( z1 q1 P" m# {, Z6 \: K3 S% z) N( n1 E$ g1 B6 I
  ;; patch agentsets
( f6 N% b  y& G& }  intersections ;; agentset containing the patches that are intersections
, i( k# H" U- g2 [' Y  roads         ;; agentset containing the patches that are roads& x  m1 j% \7 I% g
]# x8 Q( W0 d% F0 v

) ^" E& w" B& w: Y$ w8 H  gturtles-own
9 v+ r9 P6 J4 d[( ^" x& C$ P6 f' Q
  speed     ;; the speed of the turtle. g* ]* q; W4 v4 m5 U9 o; ?6 W
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' J% T& ~! {. U( x6 W+ f
  wait-time ;; the amount of time since the last time a turtle has moved
4 E( x3 c8 ]4 \2 u3 t/ h- v( q]6 [9 x" C) U0 }+ N
/ K6 z/ N6 e( q( H' _
patches-own
4 U3 f% [- H6 a/ u  j$ Q9 R[
+ T, |3 P( B5 }  intersection?   ;; true if the patch is at the intersection of two roads, b# i/ a- \4 q9 f  z: O
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ H) x9 C) j  U* L5 w$ ?$ L6 c                  ;; false for a non-intersection patches.
# U' V6 T, e4 u  my-row          ;; the row of the intersection counting from the upper left corner of the. @$ e9 X7 C, y
                  ;; world.  -1 for non-intersection patches.2 [5 D1 u4 Y" t! ]1 l: l7 b
  my-column       ;; the column of the intersection counting from the upper left corner of the
# M0 w2 [" K9 s. g: t/ h1 d                  ;; world.  -1 for non-intersection patches.
" L3 [7 Z" p$ K/ J  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' ^- u4 |5 k& ~( M  V- `4 _
  auto?           ;; whether or not this intersection will switch automatically.
4 U* {) o1 p* q                  ;; false for non-intersection patches.' K7 ^7 }4 Y5 [+ J3 p
]) {1 W( e" W8 h4 \% X3 y4 k
6 m- f6 m3 S7 H; S

7 L6 ?* _( ~( y  B+ O- };;;;;;;;;;;;;;;;;;;;;;
3 Y( |3 x3 T  Y- e9 t+ h% U) D;; Setup Procedures ;;
' \7 n9 g) k5 l$ G( T;;;;;;;;;;;;;;;;;;;;;;, L. f' _( Y5 ^0 M$ i

) }' t- w" A5 u;; Initialize the display by giving the global and patch variables initial values.
0 ?# t5 J+ I8 t2 l$ f;; Create num-cars of turtles if there are enough road patches for one turtle to$ f" i; H0 k, H0 r' g- z
;; be created per road patch. Set up the plots.
) E0 ~1 q" J0 e6 i. ~( kto setup
8 _& }; y7 n9 B: y6 e  ca
( |+ T" f% Y* G: X  setup-globals
2 W# w" t7 j) L- y% g% c) o2 V7 F9 {- ]
  ;; First we ask the patches to draw themselves and set up a few variables
* h3 A8 j* t6 J* A  setup-patches
! ~7 x+ c* r# G$ w& H/ _9 d  make-current one-of intersections. ^- O+ X" c$ a( X( M
  label-current
+ B7 O2 \+ O3 r4 I
) I7 \2 h0 P) b3 k, E0 f- y6 y  set-default-shape turtles "car"" S3 U+ U4 Z4 {% j- d6 C: C1 T
- j  A6 T5 U8 c1 K
  if (num-cars > count roads)
/ r8 n) Q, a* E  [1 {' S7 l6 p5 F# N( }4 W0 j7 N
    user-message (word "There are too many cars for the amount of "
* v8 X* z6 `6 W; v5 c& Q                       "road.  Either increase the amount of roads "0 f0 P* n/ ~' d3 M/ s" t/ }
                       "by increasing the GRID-SIZE-X or "2 I9 t$ R! Y0 }5 C4 l& \
                       "GRID-SIZE-Y sliders, or decrease the "
# h6 ^+ ?, d7 ?, N+ r& |, n                       "number of cars by lowering the NUMBER slider.\n"
3 m  a3 I. S7 s  v0 u# R* u                       "The setup has stopped.")
$ F$ ~& F- c8 n; g* c    stop
9 z! h! a1 ]3 ]  Y# ^3 {, V  ]! `3 @* C7 @& d: Y9 z1 s

: w7 F9 f, N# P! d  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! ~- a, x: f2 H' m4 V. E  crt num-cars
3 [& \/ }/ [) ]0 e  [
* K) `/ a4 h" a, _* k% g) T: G  ?    setup-cars( z- Y. o! d$ Q5 S
    set-car-color0 O. m. j- J- l0 J! l" Y
    record-data: d  _" N! y4 g; u( K
  ]
" L6 Z$ T+ r% |& H6 @+ c" q
1 c* w9 G; f# E* z  ;; give the turtles an initial speed
, w+ w, _! E. z) z5 c6 ?. f# Y  ask turtles [ set-car-speed ]' S) H8 D& U9 N$ Q  L5 c
2 e+ i1 f, k# U0 c: y+ S" m
  reset-ticks
9 [8 [0 ~  K$ |$ G( O' jend
7 q' Q: W$ K7 ]$ m, z& f; Y. j+ \. s! H5 H
;; Initialize the global variables to appropriate values
  k% o( c3 C: m8 a( l2 dto setup-globals
" v, p, `, j$ T+ ]+ c0 [) o  set current-light nobody ;; just for now, since there are no lights yet
8 W+ [* m& x1 K4 h) Q  a* V  set phase 0
, K  r0 W7 D- G4 x, I5 C5 [  set num-cars-stopped 0
  g- c0 G+ w% ^! A' I  set grid-x-inc world-width / grid-size-x
$ O( O. g9 ~5 M' B1 n2 F) Q  set grid-y-inc world-height / grid-size-y, O1 P- J1 B8 g2 N

. [7 a: _8 u% T# j: T8 ?  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
  n: O& j# j& z. q, Z8 b0 X) q* }9 |  set acceleration 0.099
4 ?( h$ V- f- \( m- F0 Hend8 k  t* ^* s/ u7 }4 F
1 e8 p; ?. ~% E' p" Q5 a
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 M+ s/ D5 W  T2 |. b: E
;; and initialize the traffic lights to one setting0 O  o- O5 i3 z) B
to setup-patches- V! a1 @8 P7 [) O! V# s, B
  ;; initialize the patch-owned variables and color the patches to a base-color
) t3 @" ]! p* t  ask patches; d/ l7 ]1 m* r! |* i# f# y
  [0 P* z7 P6 q% d
    set intersection? false: H7 `) r% _# {; W
    set auto? false5 N* @1 i" [4 X( l% q2 r
    set green-light-up? true$ V* T& [( g. ?0 I1 w& w) h; ^
    set my-row -1
; `! p. e- {: J" Q/ B1 Z/ @- }* b' M0 A    set my-column -1
' \2 `$ ], F. |! M9 }    set my-phase -1% k, ?( B' B" Q5 M5 a0 r
    set pcolor brown + 3/ l- @8 ~( D% g/ f. x
  ]0 ?1 S2 a$ x* D# e7 E

" ^$ ?/ u& o8 L9 R2 _- R0 d  ;; initialize the global variables that hold patch agentsets
/ S! j9 o1 e5 a! w1 I+ w  set roads patches with
% u5 ], A9 P) U  Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% @3 _7 j/ w& R& z1 w7 S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) ~* g: b/ Z; n1 L* u' N' z  set intersections roads with* n3 k" d+ k3 X) n8 g- ]3 Q' Q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, J* H- o2 z, Z) U% ]+ \/ U- h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ {+ H  m& \5 Q7 |
' S- O1 P# C$ _% c) C6 L
  ask roads [ set pcolor white ]( b5 d9 G4 [; T' M
    setup-intersections7 y9 {- v$ F& k/ E8 ]
end
# o  k7 c+ g1 Q& e其中定义道路的句子,如下所示,是什么意思啊?
  W+ q# y- x8 R+ \: I6 S  d5 ~ set roads patches with
. o0 E! ^2 _- q: R( }+ O" X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 r# h* @+ N& n- e9 G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 n+ m4 P8 q! Z0 d
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, 2026-3-5 10:58 , Processed in 0.014706 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