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[求助] 在看例子时有几个问题看不懂

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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。
$ W9 f- O$ X4 i3 cnetlogo自带的social science--traffic grid这一例子当中,
  P9 u! c  a/ e7 W4 z0 I3 Z7 E- Oglobals* }% n" l, j) D$ m* K/ a* X) N* D, m
[- }6 l6 C/ o6 q& O5 ^( @  K6 N
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
) V7 p8 s5 [4 r  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 l6 G- w/ N+ g& k  Q
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) u, f: q8 |, {  K/ T  ?
                           ;; it is to accelerate or decelerate
$ |7 U1 Y$ Z. W/ }7 Y/ ?  phase                    ;; keeps track of the phase
  W$ J6 b1 `9 x' `% o  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure( l4 E1 E7 K5 G4 ~" f, G. ?
  current-light            ;; the currently selected light0 p8 U0 ]- w9 ]3 w* f3 y5 `
( {2 ]$ z- z( D& \( v, T( a
  ;; patch agentsets
# V7 @0 i* i; F4 l  intersections ;; agentset containing the patches that are intersections: O$ {7 O3 g$ u$ w/ l( \8 B
  roads         ;; agentset containing the patches that are roads$ G% \( `+ |  B; R
]' T! w; N7 X3 @
4 Q- r' q4 A: d
turtles-own. G! @) S& W  ~3 c7 K
[1 E& q- @0 F9 K! {
  speed     ;; the speed of the turtle
) X" J8 v. K1 e/ W8 J  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' \+ O" c' A/ K$ f( J  wait-time ;; the amount of time since the last time a turtle has moved; ?7 R. |" I# E. t: G
]
- G# Z$ e) `, D* q9 ?' D
) {1 x; [0 C9 Ypatches-own/ r3 |! Y8 t; y  y8 ]' I% q
[/ x% `5 O- Q7 e: `6 O# x9 L
  intersection?   ;; true if the patch is at the intersection of two roads& _: _5 N+ l5 U- Q
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 H( J' d6 r3 a/ z8 p2 q: H                  ;; false for a non-intersection patches.8 u: a* D+ d. q( c4 [0 n
  my-row          ;; the row of the intersection counting from the upper left corner of the6 j) L! \$ {4 c5 R' J& L+ Y
                  ;; world.  -1 for non-intersection patches.4 r. o* z2 @: [  |  {7 `) [" X  U( e
  my-column       ;; the column of the intersection counting from the upper left corner of the) G# t0 ^# C/ L4 A% `4 V0 Q
                  ;; world.  -1 for non-intersection patches.' ?  U0 g# I7 _7 C1 ^0 [+ Z1 k) P
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
1 g/ @4 f' L+ W  auto?           ;; whether or not this intersection will switch automatically.
2 W8 A6 {. P; b# B% y; z                  ;; false for non-intersection patches.; X# p& s" F, X+ i3 {  H+ v
]' q" W6 T: `* W. i8 ^: @
7 b/ @' L! e  P7 Y0 ^9 T5 {

- ]2 e8 Z8 }9 ^;;;;;;;;;;;;;;;;;;;;;;
# n, z% I; C1 ~: u2 c2 m;; Setup Procedures ;;( P' i0 S! t4 V
;;;;;;;;;;;;;;;;;;;;;;8 M( b! I2 b+ |# g0 H; s. Z/ z) O9 C
2 ^& [0 x) e, e& {" `& I0 o0 ?9 u9 I
;; Initialize the display by giving the global and patch variables initial values.( {& y; Q0 H' l$ X
;; Create num-cars of turtles if there are enough road patches for one turtle to2 n$ Z' s+ y" W7 Q
;; be created per road patch. Set up the plots.8 I' C" N4 F7 O. z
to setup6 K) P( I9 o- n5 l
  ca
9 `, c/ F3 d6 n  setup-globals( s( `- s  I* ?( F9 H/ t

# [: o' x/ F, D, i; V; t' ~  ;; First we ask the patches to draw themselves and set up a few variables
9 ~5 [& K$ \! Z  setup-patches9 l  U* i- H9 d. s$ C; |
  make-current one-of intersections' R3 j4 b9 A  ]2 V' r% }
  label-current
; w" H( ^( t6 }0 v1 X2 _; L7 Y% S! J: m: {1 N
  set-default-shape turtles "car"4 s8 n1 E  T$ W' e
% M1 C0 E# {' o/ t( m
  if (num-cars > count roads); x( w! F6 W% Y% A4 B
  [
5 z5 {: A0 U% ]2 A: q& }6 t# B; }    user-message (word "There are too many cars for the amount of ", G; _  a1 U' u- J) ^, P
                       "road.  Either increase the amount of roads "
, `- f) q- l4 j) d7 X                       "by increasing the GRID-SIZE-X or "' d1 [; U- s! B- K% E
                       "GRID-SIZE-Y sliders, or decrease the "* X1 }& K$ ]) \7 g% n" Y
                       "number of cars by lowering the NUMBER slider.\n"- `- |! N2 n' q5 K
                       "The setup has stopped.")& y6 B& U( c6 B8 t
    stop- k% ?1 P, N" Z, Y8 S
  ]
5 s$ d' m/ a' {. K
  f0 q' W  F2 m# M  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
  M; e4 ~- X4 \5 g0 D/ j( [2 ^3 K  crt num-cars. ?% {8 s2 \0 u' z3 k
  [
4 d/ G/ Y4 _% l8 ~( O    setup-cars7 y! V4 m% m& D* |& J5 |
    set-car-color
1 N4 k9 b8 v1 ^% [4 x    record-data
( @! h% S% N  Z7 b6 d  ]/ V8 h- }, u4 G( ^
; y; F* s. P4 ]. Q  k9 ?
  ;; give the turtles an initial speed8 T  i1 n- a8 _# j; Q8 D! `
  ask turtles [ set-car-speed ]
" _4 N0 o; i- {2 [! a* R6 b: c2 ]9 I
  reset-ticks
5 i' U( O- _+ b* R/ W, Y8 V; b' |end; [! O" z4 Q) R* c" [: I! R

( l8 k  V+ M  Q0 s9 n' w# c) Y;; Initialize the global variables to appropriate values# S% `( p9 }: @3 o& _& N
to setup-globals: D2 y4 }$ a, H$ Y. H# m- m
  set current-light nobody ;; just for now, since there are no lights yet% _* _. {6 U  F8 ^. C
  set phase 0* ^4 I+ s- V- Q' S/ v
  set num-cars-stopped 0+ Q0 A# F, w% ^  @8 B
  set grid-x-inc world-width / grid-size-x
$ _$ L: C8 F$ v  set grid-y-inc world-height / grid-size-y
7 ^- q8 W2 X- V6 p( T9 K5 V+ g$ k5 e! I! v# _
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) N) g9 i7 s! S( S8 O) y
  set acceleration 0.099
( E1 C% a, w3 {) Yend" @3 k8 B8 _1 n
' A& q3 l: D0 w* I2 M, n
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% B6 e! a) b7 \0 ^, r4 m* V2 ?+ W;; and initialize the traffic lights to one setting" \) V* U5 N# i5 i+ f" x6 r% i
to setup-patches
, m- o1 |/ f( B  A3 k  ;; initialize the patch-owned variables and color the patches to a base-color& M/ \* n9 O$ R& o
  ask patches
6 F) I6 B+ x: ^  [5 _, ]* y0 d/ d- \: p% l: ^/ J5 w- h
    set intersection? false% c+ d( V  ?7 M$ c  l6 l, n
    set auto? false* t9 e& p/ l, X
    set green-light-up? true
% B% h/ d$ e; g  t# F    set my-row -1
8 F( A4 c% b' e5 W% v+ {5 W    set my-column -1
/ G' L8 U8 g* u8 ]. ]! A    set my-phase -1
. z' ]+ q* j; F/ z( T+ k  G: M4 I    set pcolor brown + 3! B, ]1 q  F( `0 ^, I1 M) X, F
  ]" q2 Z; r" A% w3 h- I/ v; `. {% ~
6 w5 @9 q- U5 ^. n' e
  ;; initialize the global variables that hold patch agentsets
. t+ s. P. S" i# C  set roads patches with4 D5 ^3 e# {7 H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 G" W4 h9 I. X+ ]- s7 }9 L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; V0 H- I) O  k3 r8 b4 a% U& @  set intersections roads with$ o9 b, Z6 \/ W% ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ U' S% i* s2 V0 u3 S6 F" R. i# ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& y# `: z1 a/ G7 x0 o1 S' |8 @% D6 p' B- n" p
  ask roads [ set pcolor white ]" a8 {2 b$ h4 n) F2 z( o; U- N: J8 Y
    setup-intersections9 V% q) K9 W1 a7 n: ?2 z
end
6 W( u( s8 l! G! R# L8 J其中定义道路的句子,如下所示,是什么意思啊?& Z3 Q, Y& a- O+ N9 V/ F9 f
set roads patches with
6 `5 c, h) w' o( D" A- T% _# n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 S3 _0 x% Z6 }% F' j    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 \, }$ q* ^6 Z0 [! o; M/ x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?
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