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: 7916|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。3 w* _% o: F9 |/ X0 Z  T
netlogo自带的social science--traffic grid这一例子当中,: _, R7 V0 i' A; q( K' N2 F* y6 s
globals# Z4 Q/ g  ~; k- l0 z. C
[
. }" W" a. Y8 G% Y: _' b  grid-x-inc               ;; the amount of patches in between two roads in the x direction2 G, a7 m! C. h1 K' E) P: I7 C* @
  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ p; J( E* J, q; N, E8 i4 w
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% q0 _9 j& }* k                           ;; it is to accelerate or decelerate$ s& w; \3 V1 q0 u
  phase                    ;; keeps track of the phase
+ ~0 t: d" ]! F5 Z7 q' {  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure) e  @$ K( q# z) _$ O
  current-light            ;; the currently selected light3 T. q* Y, U3 W- V9 N' [
/ b3 r4 R/ @" m' f+ r0 N" H  h
  ;; patch agentsets
1 t- r3 D- I2 P& P2 E. Y  intersections ;; agentset containing the patches that are intersections/ I8 O4 d" E1 C
  roads         ;; agentset containing the patches that are roads
$ J* V" I3 N) n1 x- O]. j+ i% i# @1 H7 f: M1 v$ J

5 M- t) `+ D* O- ^" ?8 ]3 Jturtles-own
+ E0 k% g) i( Y( c[/ \# c* N6 k/ e- ]4 X
  speed     ;; the speed of the turtle
* D# F; C1 t- K; M1 S4 f- b% X  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
1 g& Z1 `+ y& N5 y- p/ [; D2 i! }  wait-time ;; the amount of time since the last time a turtle has moved
9 S: o  G5 A5 d]4 t/ x8 C0 v. O. L. x8 ^2 _- f

( ~( T- `' C' }2 Wpatches-own2 _5 a& }1 e: N3 b/ ^: I: s5 G+ c. d% ^
[
1 G" Z7 r, K; T3 D' t7 m3 `* C  intersection?   ;; true if the patch is at the intersection of two roads) S+ g. j- k2 ?& e) z/ h
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.! I- t- M  R- C7 z0 B
                  ;; false for a non-intersection patches.
4 `, A5 v/ _) u9 s  my-row          ;; the row of the intersection counting from the upper left corner of the
9 W% Q* M2 @& D7 Z' e                  ;; world.  -1 for non-intersection patches.# N6 V* K3 {  M2 E+ u
  my-column       ;; the column of the intersection counting from the upper left corner of the7 I% J- Z/ v% m. I1 A$ P, P1 Z. l
                  ;; world.  -1 for non-intersection patches.
2 |1 l  Q: A, |/ A5 u  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: s8 B2 t" J* A1 |' e  auto?           ;; whether or not this intersection will switch automatically.; G# n: ]" ^/ b6 k, ]" _
                  ;; false for non-intersection patches.3 W5 g2 Q) C$ b  i: z' r' T7 F2 j
]. j: w. l* @0 l9 W
* k) U5 r. D4 \( Q' C6 V
" B! s- c# @+ g. N' g/ A
;;;;;;;;;;;;;;;;;;;;;;
1 |8 `9 E$ Y/ H! p;; Setup Procedures ;;
' _+ K) t9 f: S6 s: \  n;;;;;;;;;;;;;;;;;;;;;;
+ I8 y$ C5 w  o- U
; `# j6 k6 p+ f6 G- d% S& H;; Initialize the display by giving the global and patch variables initial values.' V. V5 i4 K6 P
;; Create num-cars of turtles if there are enough road patches for one turtle to7 l( z; c8 b9 M5 F
;; be created per road patch. Set up the plots.3 D( c9 B% \7 ~8 b6 N; j
to setup
1 Y8 E+ y3 N7 Z7 Z, T# I* o  ca2 R) w& g' H+ x" q. c
  setup-globals, P, C& l8 [8 C- ^' d& X
5 M) Q+ |5 ~* G' ^
  ;; First we ask the patches to draw themselves and set up a few variables; Z; N" D4 A3 [# b
  setup-patches$ g' r' Z* w. b4 y
  make-current one-of intersections
: r  z5 ~1 M/ s. D( A) `  label-current
& r6 k/ H/ O5 c+ r4 A4 v2 M: V* y; S8 s- u, \
  set-default-shape turtles "car"
+ L& M. S. Q1 j2 x6 p6 s/ J1 L7 E' v( r8 i
  if (num-cars > count roads)
0 d( i9 r4 A& t2 U. K+ s, j0 a  [3 ]: j$ C( r, H3 x3 {4 R  e
    user-message (word "There are too many cars for the amount of "
, F: y; H" D3 }2 ^/ O8 S, ~                       "road.  Either increase the amount of roads "6 \6 W  y/ a" \  \7 Q( D5 \, d
                       "by increasing the GRID-SIZE-X or "1 S: C1 e7 u$ r" e# H: J
                       "GRID-SIZE-Y sliders, or decrease the "
( b9 ~9 h1 r9 w                       "number of cars by lowering the NUMBER slider.\n"
8 X  {% \6 p; \* F                       "The setup has stopped.")$ b1 _. M: ?/ a' V  t# [
    stop" m' P. s7 N% M- R( t/ P
  ]! K7 O' @& H6 W' E
$ {; Z$ f, b( V7 h+ q9 ]  E
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% k/ e1 d- I5 g9 t( `* i3 n  crt num-cars6 i0 ^( }4 i  s2 `7 A2 z  m0 j
  [+ s  L+ b4 L) r% p" h. c9 T
    setup-cars: y3 \, c! F' m8 K8 _7 \/ ]
    set-car-color
7 g/ i7 D) }* ^    record-data
% E  W1 V6 l' q- m  ]0 g, p- [' D$ e9 x

* K9 m4 c3 W8 {  ;; give the turtles an initial speed
+ X: ~) n: l3 y$ P  i% y  ask turtles [ set-car-speed ]
, ]2 ]( F& F- I% D6 J0 H: T8 ~9 ~
, d: _7 b# `5 b( l: A  reset-ticks' x, j; R! F: d
end9 N& y! m& H& A

$ ~7 j& `/ q  h. z, C. g+ v$ D;; Initialize the global variables to appropriate values" d; c8 y# ^' Y2 N: X
to setup-globals
& n- a' |& L1 Z7 x/ m5 B  set current-light nobody ;; just for now, since there are no lights yet
% C; w8 Z3 \$ M- f* B! j/ ^  set phase 0
+ v. q8 j* E7 h/ x1 S- _  set num-cars-stopped 0, }: {# N( ?/ O. d# ]. H  h
  set grid-x-inc world-width / grid-size-x
4 c( D2 ?6 x+ |& [$ O5 q( L5 N  set grid-y-inc world-height / grid-size-y- _) l" M! t; |$ |' I

$ N! F$ @! q. \1 ^7 M3 {0 k3 b- _  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ Z6 m, Y" z% b" W5 n
  set acceleration 0.099& b3 C7 X1 {) |/ Z% J
end* L# c% {+ y* q0 a8 ?
; A  t7 ]$ |. V
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" T+ k. N& J) K/ F( `$ q' z& r. a;; and initialize the traffic lights to one setting2 ^) y6 V6 L# Z5 M1 N
to setup-patches
+ P2 Z" t6 k& T. K: q, U  ;; initialize the patch-owned variables and color the patches to a base-color
) k4 u. L( l4 b  ask patches
1 Z- O6 K4 `3 G) `. d) H8 s- |1 ]' z  [
  }8 @6 Q/ e9 G% ?' Q; H$ ]& W5 A; @    set intersection? false
( V# m5 g, z) A! P1 g    set auto? false
2 S! o/ U2 A3 s; I    set green-light-up? true
; k/ z! p4 C' X& S' b% [( Y    set my-row -12 B/ z7 [9 m/ w% ]0 K
    set my-column -1
; c2 r+ V2 _7 E2 e. Z4 U$ i8 Q    set my-phase -14 s4 _5 l3 v7 w7 M& K4 O
    set pcolor brown + 3: v  W$ S8 l. o
  ]
: Y6 d0 d/ \0 h# ]' U) f
) _5 Y+ u) d5 _: {7 T* D8 f  ;; initialize the global variables that hold patch agentsets% P) E. ]: {7 t: ]2 p: Y
  set roads patches with
6 T$ f% u3 k  O  t5 t( [* n, ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ `1 b" k2 W3 |4 b1 K" f# H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! |" ?* ]8 W8 }  set intersections roads with% i- ]5 s* v# G1 z, a1 D3 q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- B2 ^5 }  b0 l% T4 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 H# k8 n) d. u. e$ r' ^
# _* A! C( j! [6 N( l8 _
  ask roads [ set pcolor white ]
, t, ^6 _9 b6 b) A% k1 X& N    setup-intersections
$ l+ y4 Z( ]( Y& }end
: [& @" h% H% B4 |. B& j5 j! p其中定义道路的句子,如下所示,是什么意思啊?
5 O! V. _5 g) a' J) ?  j set roads patches with
& ^1 f2 N& a& t# v# x6 |1 ^% D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ w7 q5 W# R/ [, |, r' o    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; c, A  \8 C# f3 x4 r) e
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, 2026-1-22 22:35 , Processed in 0.015997 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