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: 8521|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。
# t1 _' H5 q$ q8 f. \netlogo自带的social science--traffic grid这一例子当中,
. K7 K) O% l, i$ \' L+ ^; M4 ~globals
0 T* ]- I, \( l/ C/ C[: ]6 B  _* K; ~) U. Q2 [
  grid-x-inc               ;; the amount of patches in between two roads in the x direction4 u$ H7 l/ r5 K: e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 Z+ L0 W/ j. ~6 i+ z2 U) i" A6 b& K- {  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
/ H, K4 l5 N7 \( D, D4 s' E                           ;; it is to accelerate or decelerate
. A3 `4 q8 b' X$ w. w+ r% W  phase                    ;; keeps track of the phase$ B5 ]7 Q' G% J9 O
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 J+ H$ g3 `0 g9 x  R  current-light            ;; the currently selected light+ i0 G1 }: `) Q; ~+ R

: l" g( N7 z( [3 F, t  e+ ]: y# H  ;; patch agentsets: Q: d# A! Y; q. z) D1 K3 l, c
  intersections ;; agentset containing the patches that are intersections- k7 x$ j1 R6 N$ `, i6 W
  roads         ;; agentset containing the patches that are roads' i& N- l" ]. J- _6 [- W# d* s
]# u$ F, g9 r4 V/ u* J* g0 P. z: ~
9 n& v; O3 k0 n4 l
turtles-own
0 G% V) W6 `, r/ E' _% i[2 U" r) j* S2 U1 \
  speed     ;; the speed of the turtle
) p+ m3 C4 ?1 W: L: K0 L9 T3 j. U2 U6 b  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
5 R: d) `! Q6 j  wait-time ;; the amount of time since the last time a turtle has moved8 \6 P0 T" p6 N3 H
]0 _! d  C5 x1 o, A9 B

( E' `. Z6 ^9 h& V  Zpatches-own+ M9 p+ p2 {% |9 Q8 y6 T- s
[# U: y" x  E) y
  intersection?   ;; true if the patch is at the intersection of two roads
( r' v# d# Z) w( N+ K4 ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ r* ^# M. i9 h. `) y8 X# w# u
                  ;; false for a non-intersection patches.8 {( u* ^) E! O: L$ O7 m2 T2 N
  my-row          ;; the row of the intersection counting from the upper left corner of the
) @2 z+ f9 s/ O7 e+ y                  ;; world.  -1 for non-intersection patches.
! E7 V) i$ R! a' \  my-column       ;; the column of the intersection counting from the upper left corner of the
6 M/ n) V' @8 `9 `( F$ X2 h                  ;; world.  -1 for non-intersection patches.
% ]$ `( d1 g5 ^# x+ T9 u+ P# p! ?7 a  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' a0 X" O3 ^' w* w
  auto?           ;; whether or not this intersection will switch automatically.$ b0 `8 h$ t7 A( R% W/ _6 v( \
                  ;; false for non-intersection patches.% q+ _6 p$ f$ Q  _4 |% X, V
]
- g- m0 l5 h7 [3 ?
- T2 r7 Z* d6 E4 F; @4 Z9 t& [! ?' {" d0 F1 i
;;;;;;;;;;;;;;;;;;;;;;, j; ~( d! F+ v: d
;; Setup Procedures ;;3 m) n& _3 `. v& [/ p7 R0 x, t9 n
;;;;;;;;;;;;;;;;;;;;;;
/ @! H) N3 k4 p" r& M
! G/ L" @4 y' U1 j9 A;; Initialize the display by giving the global and patch variables initial values.
3 G3 Z9 D$ [: G: R5 u* Y* l: E;; Create num-cars of turtles if there are enough road patches for one turtle to  d  Z5 [0 W( w& _  a2 b2 \
;; be created per road patch. Set up the plots.
" P+ [; q" {$ O- j9 e2 yto setup
% ^; w- R+ m0 P9 b# p  ca
/ ]$ p3 I1 e7 ~* Y' \0 X  setup-globals
- U! F' _' O- A3 ]7 b" n- ]
2 w" C& @: T" o& W; f  ;; First we ask the patches to draw themselves and set up a few variables
1 I  E0 u: K8 u! I  setup-patches/ k8 b- z0 ?. A; A8 {0 a
  make-current one-of intersections/ ^2 V1 p: L. m. t0 K* [
  label-current% x7 R- n) I3 ]5 _; ?) a+ Y$ x
( o" J3 F1 `# C
  set-default-shape turtles "car"; y7 H0 l; q$ h; }

* ^0 j( ~* `6 ?5 ?  if (num-cars > count roads)1 y) f' K- r" V
  [3 |7 \6 d; a" [- E' U: \
    user-message (word "There are too many cars for the amount of "
* k- k" ~7 y0 l6 H0 |                       "road.  Either increase the amount of roads ". T9 j# T6 }/ m. I- x
                       "by increasing the GRID-SIZE-X or "  b9 D2 D% b/ C  v
                       "GRID-SIZE-Y sliders, or decrease the "8 O) {; b0 h( c  {# C
                       "number of cars by lowering the NUMBER slider.\n"
8 d! E! O$ V3 F                       "The setup has stopped.")
+ M9 D- [! `5 J  H$ X$ {) c    stop  N7 J# A1 Y! u+ z& n% `7 J
  ]
8 T! H  w( T: W7 n# S+ _
* c+ g+ _( X% l, `  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 [9 d2 [7 b6 P  crt num-cars- X* r" ~0 W0 ?) c) H' P: S8 C
  [
( d1 L( L. |% r9 D' y$ o" |    setup-cars
& x$ ?! _: w: s9 _    set-car-color- a  O; v. b) H9 W' e1 y% r! ?
    record-data
0 I/ {, S3 c! t  ]
' N7 S+ t6 S$ O; V( i3 Z5 j5 B
' x: C2 ~1 y; H8 H+ ]  ;; give the turtles an initial speed. S: o/ \& }: w; n
  ask turtles [ set-car-speed ]
, u/ o+ N" _, G- B2 ]$ L9 W& {% Q% c+ F
  reset-ticks
& G$ ]9 d9 Y/ a' \end& r! E  r( b1 ^" i0 q9 p( Y
5 w  W; Z2 P( t% P) |( V% J, x
;; Initialize the global variables to appropriate values% T$ Y' c" i; a) ?5 {8 L
to setup-globals  b: U( b  d) G1 K
  set current-light nobody ;; just for now, since there are no lights yet7 Q: @' H/ t& w
  set phase 0
  ]- ^* j5 Y% U* c: c3 e: Z3 y* q  set num-cars-stopped 02 c9 a) @  \0 H  x+ s8 f" ^
  set grid-x-inc world-width / grid-size-x+ t+ ]* X3 j% m# C: p4 A
  set grid-y-inc world-height / grid-size-y
* o8 a2 U7 r' Y2 H0 K- C9 }# t. n* k" S$ W& L9 Y0 Z6 k
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, o' V# y& I: F5 B! \; i
  set acceleration 0.0998 K9 d3 C; i% J2 y6 |/ \
end- J& H7 w+ f/ d; a  {3 U3 m
$ u! f+ n1 |* M, `: `+ v, j
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. A# f0 ^& k6 I+ [% l3 [
;; and initialize the traffic lights to one setting  k4 A; P7 ~: I: j7 I- S, E1 O
to setup-patches
6 p- G4 _& {, S( y  ;; initialize the patch-owned variables and color the patches to a base-color
9 p- G0 D+ n: t2 V( C" E  ask patches! g; z! G) u' h2 }
  [
7 z$ `/ S) ~2 u- M9 Z4 D    set intersection? false
. _6 a7 M/ w2 e3 N% i! y* L    set auto? false( N4 X, p* y4 W! c* _, u2 R
    set green-light-up? true
5 M  `; b( [5 o: A    set my-row -1; b2 d5 u9 x& ?/ K& P+ Z/ ^* C! _
    set my-column -1
$ r* ?; c" v  k" L" A' V    set my-phase -1
( y# L8 w  H3 X8 Q1 j' v    set pcolor brown + 3
. r# t$ M7 d5 M) D5 q* w  ]: t* H0 W4 Q2 J
) b, U/ N& @! |8 u  W8 G, l
  ;; initialize the global variables that hold patch agentsets
6 M; f4 @4 u: P7 a2 m. x/ O; L  set roads patches with1 h$ T- l! F: W3 U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ e) b' I  @8 B    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  `" @& P) N6 Z; R) n5 T5 K  set intersections roads with
0 ^' F8 h9 |! \1 o$ F+ G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) p  a3 a2 e9 K, y! ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  L* A5 I3 N% ?% g
3 M8 |3 B4 s. j0 w+ o! ~. {: |
  ask roads [ set pcolor white ]& p) G) Z  i6 Z: m' F3 r
    setup-intersections* Y. B8 `/ {" T
end
1 [" C, s2 ]  O5 n+ y. a% E2 B其中定义道路的句子,如下所示,是什么意思啊?3 m1 z' U) D( X6 J5 X+ c& @
set roads patches with; k' \* e: i3 D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: k9 X2 J9 S5 i4 r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" d1 }' Z/ B, H3 i$ E9 ]; i
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, 2026-2-23 02:17 , Processed in 0.016242 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