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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。
- {& m3 u+ s/ A0 i8 Q6 A9 enetlogo自带的social science--traffic grid这一例子当中,+ e2 a8 [0 ^2 _" O/ T: |( u2 d, u
globals
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) X& a8 o  `/ y& F) I  {  A  grid-x-inc               ;; the amount of patches in between two roads in the x direction( U! N5 H2 C; U* e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction* L/ l8 ]2 F/ C# U9 c' e
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
1 v, @! F, R4 ]3 f+ ?" T                           ;; it is to accelerate or decelerate+ X' p, H- K1 \
  phase                    ;; keeps track of the phase- Z) W: @( W" _+ D
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! q. a3 d; k  k$ z$ t# F
  current-light            ;; the currently selected light  Z' q. l/ e4 x) M% T

) p5 B6 k! p( }. e, w( x  ;; patch agentsets% c0 _+ p- ?+ M, S& n
  intersections ;; agentset containing the patches that are intersections' P. W8 J9 w4 B' i+ G2 ^+ U
  roads         ;; agentset containing the patches that are roads
" g* b% S" g: H8 W# ?2 U: z]
$ z" H" x* M1 f# Y9 a( N/ a+ E0 T
, X7 R$ s. w- Q: A. Q$ f% @0 ]  Mturtles-own
" ?6 g6 q# h9 }# w( x4 Y' I[5 L* {; M7 `/ j# s8 F% W% o. V
  speed     ;; the speed of the turtle& Z7 N, s( L. N5 r0 h& Q, a
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! U" Y8 p& r- n% X  wait-time ;; the amount of time since the last time a turtle has moved( x  {0 j6 Y% m
]( Z1 R. w3 J! ^( a
7 k. \! t& E; a4 f0 ^6 d8 T5 ]$ n
patches-own
4 j+ R' S9 m4 z' M[" H# B6 L- {; E3 s) X  J
  intersection?   ;; true if the patch is at the intersection of two roads4 C) `& `$ c; ?6 W9 ~3 l' [5 _
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
+ h6 @: P' S/ g+ c! E                  ;; false for a non-intersection patches.& T6 o/ ~& l  y7 l1 c
  my-row          ;; the row of the intersection counting from the upper left corner of the
! K! [" D8 A6 r4 P- m' a( q/ {                  ;; world.  -1 for non-intersection patches.& E; s: u7 T! t
  my-column       ;; the column of the intersection counting from the upper left corner of the
' U- o+ H- a0 v1 c                  ;; world.  -1 for non-intersection patches.
$ E3 h; U5 W* J- i, L- B  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 c+ R. a2 a6 y+ F4 Y! }
  auto?           ;; whether or not this intersection will switch automatically.
8 l  f! `0 r# ~! ]1 M) L! O* ?6 d                  ;; false for non-intersection patches.
, n' L1 P" @& j$ ?0 {3 y- I: u]0 M3 q3 E. u$ ?$ s) O

* Z3 v' d) ?2 k  F# s. A( o  E( R* {; `% |! Z
;;;;;;;;;;;;;;;;;;;;;;: u- |; i, T3 |7 L' I
;; Setup Procedures ;;; Y# N% p& j2 T$ ?0 z, j4 F
;;;;;;;;;;;;;;;;;;;;;;; z2 [; q* K( O
8 k4 w5 s, Z- s4 e
;; Initialize the display by giving the global and patch variables initial values.
' K+ `! v3 p1 Y2 x4 H) R* q/ k;; Create num-cars of turtles if there are enough road patches for one turtle to
  x) q3 H# q. E2 l  a5 v;; be created per road patch. Set up the plots.
8 H  a5 z9 {0 lto setup
2 _# b( a2 E# G1 v# `7 i  ca
# @) q/ a: |6 ]9 l  setup-globals3 n  C  D+ Q  I! \; X% K, F  D
2 D( K: E# C& }" b
  ;; First we ask the patches to draw themselves and set up a few variables
$ K* j) J+ [+ |' ~5 I0 h4 I  setup-patches5 z- D0 Y% ~: U; a8 f
  make-current one-of intersections
; J/ W4 r0 [! I0 O) p3 K$ x& G: h7 Z  label-current3 z( i- W) L/ s$ Q' @* |

' }* J- S9 q" X$ a0 J  set-default-shape turtles "car"
; C- w# c1 k6 K9 U- {% y: \5 r5 v+ f0 E% i
  if (num-cars > count roads): C( g$ i" D) z1 V
  [6 `% C1 s% H: C3 ^/ L
    user-message (word "There are too many cars for the amount of "
. I" |. e8 h% k# N- A9 E                       "road.  Either increase the amount of roads "* |% j1 B0 Q& a- w$ ^  j% e
                       "by increasing the GRID-SIZE-X or "1 Y  g+ u  i$ _/ E/ X; z
                       "GRID-SIZE-Y sliders, or decrease the "4 l, {, ^% o! O$ I1 }: c5 k3 a& B
                       "number of cars by lowering the NUMBER slider.\n"+ s7 {$ m* a# x3 v5 |
                       "The setup has stopped.")2 y1 Q$ R) d' g& T
    stop: Q1 v  J  y# N6 v% P1 a/ I% D
  ]
3 K8 K. W; K9 ~/ C+ j
3 X, v  U7 w. j  e* l8 E  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 H& z  K# R$ B" w) P0 j, t
  crt num-cars" ?$ P& ]+ E% R+ t# `. J/ m
  [
* [. J- v9 a  Z* u) }: Y# G( N    setup-cars
* L& W) e; X1 Y' G- N) [2 @    set-car-color
1 q- K' M" E4 L2 _! H( X! N    record-data
& S1 L& v) W; l- h) T  K  ]
/ l2 r& \5 r! W1 g( t, S( a
/ z. \; \, N9 I; d  ;; give the turtles an initial speed
/ |7 D  [8 l% Z& a  ask turtles [ set-car-speed ]
7 ^: h' R, i3 H8 H6 W; c
) Q! B" I7 ?7 }; E  reset-ticks
3 q* d- ]% Y! `end
- Q+ ^* h+ f/ z1 `, u" f3 r* R2 M, O5 e: }) W9 W/ F8 C$ n
;; Initialize the global variables to appropriate values
& q  `/ x) ?* J$ ^: Gto setup-globals6 P* g7 h. x& ?* f/ J
  set current-light nobody ;; just for now, since there are no lights yet5 ?& ^2 n/ t7 O8 G* [8 ]
  set phase 0( f9 G, z2 ~8 k# A6 Z
  set num-cars-stopped 0) u# ~. g. F9 r$ i  L3 C
  set grid-x-inc world-width / grid-size-x
  [) X" {$ m+ e. r* _, g8 [  set grid-y-inc world-height / grid-size-y; ?" f3 W9 P5 z2 ], U) e4 s

+ }0 i- N1 T* A# T/ @7 K* V9 s9 U1 q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; l" t' d: |7 C1 ^
  set acceleration 0.099
+ m4 ^  D, `; ]1 Z0 i3 N& `end
- c9 B" C8 f2 `+ M3 L- b6 a! U# B6 x0 {+ e6 F& X8 Q* B1 k' l
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& F* X9 g3 W4 r9 g5 q
;; and initialize the traffic lights to one setting" k8 P  p$ e/ _# V% p- V6 |4 N
to setup-patches
( q* C$ J& g0 q: V) @) U- v  ;; initialize the patch-owned variables and color the patches to a base-color
7 Q- \  y8 j; n2 E0 D8 b  ask patches6 y2 q. S% k2 D+ g
  [! U  l) W: |2 |: o4 [# B# Z
    set intersection? false
) g' n3 j# D5 N, D2 u) D( I  r3 z    set auto? false/ H; {) o: M4 A7 ?, |' U
    set green-light-up? true
( w' E/ l& p& K% r* x4 {/ A    set my-row -1# k2 h& q( j  p. N0 J; m# Y9 a
    set my-column -18 x" s( N5 n: `0 I; K$ m
    set my-phase -1; j% I, x- t! z$ P3 K8 d2 [
    set pcolor brown + 3
$ k9 |2 s+ l& M9 W% x  k; x# l  ]! M9 [, T% O* c( U. |4 Y

* I6 `' `0 F/ t, ~  ;; initialize the global variables that hold patch agentsets6 [$ T! V& r: i2 {4 n" s
  set roads patches with' A' n0 N+ i5 N4 W! D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& f1 \4 e8 p& {- O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% j+ M; w* {" S7 {* [0 ^  set intersections roads with
" \. N2 {. [& D2 e  R# L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 q+ m: z, ^. c  W0 {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  J( j0 t: O# a( ?7 [. w
) `7 C! x, m- t
  ask roads [ set pcolor white ]/ L$ n5 {, V) C' ~& N4 a
    setup-intersections
: D% I3 Q- I& w" gend
0 x7 s/ `6 h! E- {8 e: F! q* L其中定义道路的句子,如下所示,是什么意思啊?  S% K+ K4 Z% \7 @. F) o2 p
set roads patches with: i8 g% \# p/ D* ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 d' I) h4 n, p/ G# U" a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 u( o8 k( e8 q9 D1 L3 b) |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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