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: 10295|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。
8 H( E7 ^7 a8 ~+ c4 vnetlogo自带的social science--traffic grid这一例子当中,
/ {/ m+ J0 u; s. ]globals
5 h5 b9 L1 ]; T( `& L! J. Q[
/ ?, r7 W: I; M  grid-x-inc               ;; the amount of patches in between two roads in the x direction. Z1 R2 Y  C/ ~" K& ^% r
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 H" n" q: Y3 _  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 v+ k: J4 F$ P) F- C! W
                           ;; it is to accelerate or decelerate
! W" E, ?) d1 r( G4 g6 ^6 r  phase                    ;; keeps track of the phase
% u2 U5 S! s5 u8 ^% L2 ]) N+ V  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
: }6 k7 Y: R% x$ i  current-light            ;; the currently selected light) h( D. d/ S  y2 h0 F+ P5 J2 B: q5 m
% _5 L+ @+ B. a$ S8 p( c
  ;; patch agentsets( g5 A) G0 y8 B- q( E* H& Q. F: O
  intersections ;; agentset containing the patches that are intersections
. t% S7 x0 D; a" _  roads         ;; agentset containing the patches that are roads9 `! C4 q! V5 u0 e
]
- T) d& A9 D1 ^- O; a- b8 A- q: m" k
turtles-own
+ [$ s# L6 J; S7 v) i7 A7 c[
" \8 B+ J: u$ V1 }. b  speed     ;; the speed of the turtle
! [# g- \" f* Y: d& J' [/ C& J  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 i2 {! B$ g; D  \! W  wait-time ;; the amount of time since the last time a turtle has moved
1 h6 z: S: G5 l7 _]  z4 ^5 `/ l4 Y9 n! H3 v( f

2 P+ Z9 ?% {- C4 Tpatches-own6 F3 O" ]3 [( Y5 `
[
; F; ?: I6 I& O$ l  intersection?   ;; true if the patch is at the intersection of two roads1 N( U/ n( h- F$ P  N3 f0 E
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.6 z9 a/ U; z1 S1 @3 G& N
                  ;; false for a non-intersection patches.6 f! @/ D8 |$ S+ F
  my-row          ;; the row of the intersection counting from the upper left corner of the
! a+ V) ?2 C( N) m: c  r# N                  ;; world.  -1 for non-intersection patches.6 D4 a! c; [. S3 b: B/ v
  my-column       ;; the column of the intersection counting from the upper left corner of the
8 U5 Z6 j. U2 h7 K                  ;; world.  -1 for non-intersection patches.% V0 l" h) @) O: @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ S/ w) M3 K# L  auto?           ;; whether or not this intersection will switch automatically.- g+ j, ~2 q$ `8 _- f: P% Q! y
                  ;; false for non-intersection patches./ @" S- g1 p( v2 t
]! s  s/ j! q- l6 Q1 p! r* P
2 `% u3 Q" T) c( W& {

: W6 }: v* i- H;;;;;;;;;;;;;;;;;;;;;;9 g# I. @* y* i' D/ a
;; Setup Procedures ;;
+ D" t# E  |0 q; m' a) C;;;;;;;;;;;;;;;;;;;;;;# y0 B; R4 }7 T9 V9 @! X

, U: H; f  q7 @  w7 v* G% ~+ x;; Initialize the display by giving the global and patch variables initial values.
, V6 l+ |- D# {- w9 q$ p;; Create num-cars of turtles if there are enough road patches for one turtle to
. _7 z! Y! g& e! @;; be created per road patch. Set up the plots./ S1 M5 U1 n( m) a
to setup
0 i/ \' u. K- P  ca8 w0 C' g* u/ d4 w! \
  setup-globals
! I# `( k% l- q7 D
6 A# y' u1 e) e3 |9 P, Y  ;; First we ask the patches to draw themselves and set up a few variables
, s/ C9 G: c* R  setup-patches
( P# Y6 [5 G+ \* ^% Z2 u2 k# U  make-current one-of intersections
0 f3 l8 T/ D6 {0 `) k9 Z  label-current/ c8 q2 i9 ?8 f

) E9 a: y" z) T8 D  set-default-shape turtles "car"* t8 M: \- X: b1 o7 e, J

2 s! z' f5 G7 x  if (num-cars > count roads)1 V4 x  ]) V2 I& c1 ~% f5 c; ?
  [
( z3 q2 e- j/ G/ z    user-message (word "There are too many cars for the amount of "  w# [; r6 [% J" U
                       "road.  Either increase the amount of roads "
) ]" M" y8 q1 g& Z                       "by increasing the GRID-SIZE-X or "
8 J9 T4 c3 Z# e2 [                       "GRID-SIZE-Y sliders, or decrease the "
+ Z7 P( z8 y8 H2 {                       "number of cars by lowering the NUMBER slider.\n"
) q7 ^# K- c+ m  e1 v% t                       "The setup has stopped.")
* m# O5 k0 q; f( n# ?2 r: h    stop
8 P" ~4 @3 x, J+ b  D8 t  C  ]
9 I* E2 y) ^& I0 f4 ?( p' K, T7 y2 W- o1 O( c5 U* s5 i9 n6 S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! i5 V9 ^2 s, }% O4 b. k) S6 |  crt num-cars$ W9 E' G9 f* j9 L" h3 E
  [
( s" V  U8 ?! c- Z7 y3 ~" `% Q    setup-cars5 V) Q; L! b% D$ u! ~3 F
    set-car-color( y9 g: C% W' D. s2 x7 t5 P
    record-data. `/ Z2 X: D- P6 b5 J" i
  ]4 J, m0 R- J% P4 N
+ T6 ~# o( |6 b3 k! k
  ;; give the turtles an initial speed1 @/ u6 v$ W* e: K0 v4 K
  ask turtles [ set-car-speed ]* f" R' A" s0 I+ f/ x& S

- I! q6 [5 T0 E( y( o  reset-ticks
1 d  d$ z/ R4 h: ], tend
, r# |- e, y( O0 ]( l- O1 f+ l9 _$ m( G" m2 k
;; Initialize the global variables to appropriate values
+ O. g1 b+ Y) e4 r) ~% _" Kto setup-globals
! B0 x1 j6 a# u/ {9 O  set current-light nobody ;; just for now, since there are no lights yet- \# p+ l, [* W
  set phase 0# b8 Z# [; |( f9 G
  set num-cars-stopped 0
4 q1 |- B% K* F- K  set grid-x-inc world-width / grid-size-x
7 l2 o: ~5 ^, ^+ o  set grid-y-inc world-height / grid-size-y
$ W1 F1 @6 O, g: D: L" g- c3 p4 l: j$ V9 ]
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ h# G. N4 _/ S* B# }
  set acceleration 0.0996 Z0 U# H6 ?! D8 a
end3 {3 V7 z  D3 z1 z: K  e
9 j) V$ Y1 v* z' F+ i! r
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 [4 t, r! f9 z( \;; and initialize the traffic lights to one setting% x1 |1 f' V, v. g/ F  A& ]
to setup-patches3 V( o9 x. o8 w7 |; l
  ;; initialize the patch-owned variables and color the patches to a base-color0 x* m9 S% o9 w3 v# I& Y1 }/ {
  ask patches
8 x( u& @" O* A  D0 C  [$ R% T+ o/ e8 }% o6 T6 B8 ~
    set intersection? false  \( w! e; b% s& I+ d
    set auto? false
) a" p  j5 ]+ ~4 a    set green-light-up? true
5 N# b' n! k' q. @    set my-row -1
6 ^7 K+ Z$ y/ N! _2 s2 ]9 P/ L    set my-column -1) w9 M2 n1 g( r) }: P. e8 J# X0 Z
    set my-phase -1
1 t9 n* C$ o; S    set pcolor brown + 3: _2 F  B; c' d
  ]
8 @. s$ b( l! D8 |3 ?: v0 m3 {, l: [! J7 T- i
  ;; initialize the global variables that hold patch agentsets
+ J" W9 A  ]8 f! s# q% o9 \  set roads patches with/ x# S- z9 w2 I" K: A. R  f8 v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* w7 |; Q! C8 r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- {7 L3 U% c# _  set intersections roads with
6 b: b3 h: p7 V& N' m    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 l: ]0 S7 s; x8 V4 L. @' F* a: d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# O& D" H0 r% Y
: G6 f& E) b. I- f! x+ y' y8 ~  ask roads [ set pcolor white ]
9 P4 I/ ]( x0 U4 B! _    setup-intersections- v0 `4 F* g/ v9 x: C% v
end
2 _- p9 D# S0 _' T5 g9 F其中定义道路的句子,如下所示,是什么意思啊?6 G& w- {, o8 Q& B. \7 D4 P, |: ?
set roads patches with
8 J5 Y' q% {8 \* x5 t2 n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 u/ o$ o, i$ w$ `    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' X+ P0 Y3 S( x6 y) r
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, 2026-5-29 02:57 , Processed in 0.012604 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