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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。
2 X0 x, Y5 G9 Z) n8 Hnetlogo自带的social science--traffic grid这一例子当中,) f- y. c( M% o# c$ B* F; r
globals
4 d2 P8 j$ n) ?, I+ M. A% j' z[. ~9 N& Z. J4 J
  grid-x-inc               ;; the amount of patches in between two roads in the x direction1 h" ~6 X7 H# I1 C, q. Y
  grid-y-inc               ;; the amount of patches in between two roads in the y direction) o! m6 c6 r/ y8 m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# S& s" S: ~9 ?, A  ?                           ;; it is to accelerate or decelerate
* o7 G7 P/ O: H% z  k; Q6 U' s  phase                    ;; keeps track of the phase" f  G/ F) W* c" u: x, }
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure: ^6 B  V$ O/ y( g0 ]- L
  current-light            ;; the currently selected light/ h: v8 b  j7 q8 ]( G$ j

1 w6 g# j! D, h, q6 \4 F. ]  ;; patch agentsets
" D5 Q+ b7 r4 ~  R1 j: M  intersections ;; agentset containing the patches that are intersections5 n% _* n! l1 g; U4 d. I
  roads         ;; agentset containing the patches that are roads/ W: j3 p- k7 s, j8 m
]
: c) Z/ w1 C5 n! A1 d
) n+ e5 e9 ]5 P' Q6 t1 k, {7 uturtles-own% Q3 I  Q( @9 F
[
  Q8 e  [) t0 c4 @  speed     ;; the speed of the turtle
2 Q0 P( s0 |3 A4 D  d8 k8 {  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 M9 M: l* _) M# z, k- Q
  wait-time ;; the amount of time since the last time a turtle has moved3 B( |  B+ p5 ~$ z- }
]
. u$ Z+ T) w% @# n) U3 u
4 c; o5 y4 A5 k3 r+ ]9 Cpatches-own. k2 @/ t7 G. M1 l
[/ \: L) i: I0 x3 z, ^
  intersection?   ;; true if the patch is at the intersection of two roads2 K) z$ B  R% j9 V. i
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
+ b9 v0 N1 V  N1 T+ D, f                  ;; false for a non-intersection patches.( _1 M3 ~! r) Z8 c( o$ c8 i" t2 B
  my-row          ;; the row of the intersection counting from the upper left corner of the! J$ _  N% L: V
                  ;; world.  -1 for non-intersection patches.
5 K: \/ M: i; j/ D  my-column       ;; the column of the intersection counting from the upper left corner of the
4 Q0 [8 d- Z/ F3 b8 N                  ;; world.  -1 for non-intersection patches.  ?7 s3 p& _  V/ K
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.7 b& r7 _3 s, `- o
  auto?           ;; whether or not this intersection will switch automatically.& H5 r2 J( g7 U, u& D
                  ;; false for non-intersection patches.
% M+ T7 _: H2 f  H]
/ N, a2 u: F  o* \( a3 ^2 y/ n( p
  S' y  Z1 a% y8 E( m1 W* I& ^1 K/ @$ u: R) b; T  g
;;;;;;;;;;;;;;;;;;;;;;" j4 t2 J, E& u
;; Setup Procedures ;;% ~  q% A% p  F  k- b9 f
;;;;;;;;;;;;;;;;;;;;;;4 _" J1 o% l0 D, Z, u& E2 _
" b: [. P0 q: g" I) U- _& }( G
;; Initialize the display by giving the global and patch variables initial values.
* z  u! D5 A2 O1 n;; Create num-cars of turtles if there are enough road patches for one turtle to. l4 {/ ]  J& i) Q3 B9 A, q7 @* T
;; be created per road patch. Set up the plots.
3 l9 x" P; U$ u8 }' tto setup7 N2 ^/ J( e. |/ |
  ca
1 X. O  Q9 T0 }# q  setup-globals
; J; K- E7 t4 H
6 V; M" _% |) a$ {8 z( ^3 s, A  ;; First we ask the patches to draw themselves and set up a few variables. E+ P$ D& g: v6 V# _
  setup-patches
# Z9 z% Y9 F) ^; N  N/ z2 c8 L  make-current one-of intersections5 _8 c0 A+ U/ A/ K: M
  label-current
* _0 t' ~/ [0 A
* P5 O+ b0 z$ `4 r  B2 K  set-default-shape turtles "car"
- m! b6 K& y# H; e2 G2 D
6 l/ O, b, P! G  if (num-cars > count roads)
+ _4 J2 j- I: O( K+ M  [
3 E/ E& m0 e0 m" c1 M( d+ f    user-message (word "There are too many cars for the amount of "
, V% P7 J1 n, u) @                       "road.  Either increase the amount of roads "1 k! J# C2 `7 @- Y
                       "by increasing the GRID-SIZE-X or "; Q. [! B7 c' H2 c: k
                       "GRID-SIZE-Y sliders, or decrease the "3 y$ k6 E! V! [0 l* p
                       "number of cars by lowering the NUMBER slider.\n"
# K% {& p- D* T3 x5 p8 _% _                       "The setup has stopped."): ]  v& X/ d( n! t6 a$ X
    stop
. b: X) q. H7 O# Q' t  ]
5 u( `+ d2 B8 I
/ P0 F2 b2 i1 V  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  j# c* E& z- U3 ~6 M
  crt num-cars0 v( J9 ^& g5 n* J% H. _7 [6 W; Q/ m
  [
+ ?7 {7 i/ l& z0 ^  O& G6 u1 y1 g    setup-cars
8 Z7 k3 b! v" u" k, T    set-car-color
; W  \7 Y5 R- @/ n    record-data! i# u+ m  p9 M' m1 r5 i! E
  ]9 W0 |% t4 C4 m

& ^2 N* d7 F$ r9 Q  ;; give the turtles an initial speed% `! Q+ b4 u& q4 s/ P
  ask turtles [ set-car-speed ]  J8 f% t4 @7 h& v

7 j, m, L6 \1 ^- q% n4 {  reset-ticks/ Y- g9 f; U  \+ t
end5 T/ j" b! q4 N, E

5 T2 i4 f6 l! l, y& `& a1 N;; Initialize the global variables to appropriate values
- \% g  l) |+ m; u: Mto setup-globals! t! O$ [- W' U$ Z
  set current-light nobody ;; just for now, since there are no lights yet- x+ l. f3 v5 g0 q# K( L! e
  set phase 0
8 I) b2 Y) w" \6 S8 }! ]' i  set num-cars-stopped 0
8 _, ^7 ^9 ~* W, u' M# m' _# G+ B  set grid-x-inc world-width / grid-size-x
; ^8 K; j/ @% N  ^! H0 ~; a  set grid-y-inc world-height / grid-size-y
: d4 I7 s  t; a! B! m! v% @3 S; t: ^7 H' Y2 Q, k) P7 u
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ j" Q' `5 e( R" m3 b4 X9 S" t  set acceleration 0.099
& ?0 J4 ^* C* V& T0 Y+ Q) Yend
; f( b5 ^! @6 ^5 N& f, u, I/ N& @( q" n- [' C  D) s9 w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ X3 m( N4 M0 ~) U1 X
;; and initialize the traffic lights to one setting+ ^& C8 s( c( }; }+ t, {, |
to setup-patches
# S4 G+ l/ R2 ?2 ]; ?1 U  ;; initialize the patch-owned variables and color the patches to a base-color: Q4 T! H$ Q9 t
  ask patches
/ x8 `7 ~% Z3 F0 X9 r+ @  [
; u; L! _; K9 E" h) J8 _- }4 W    set intersection? false: j! R) t( ]% M: ~6 K. u
    set auto? false
7 `9 J  s) W* k. s4 j* p    set green-light-up? true" G" x/ J* s$ k# E
    set my-row -1% d( R. q9 \6 L
    set my-column -1
! v6 K2 }0 F  H7 L    set my-phase -1, D/ a! h$ t/ w+ M% Q
    set pcolor brown + 3
% U1 t5 Z  f5 V" K/ b9 W  ]' N$ H& [) L$ q. M7 M; n. n8 ^, i- \
% I5 s2 ]" i7 f! g7 P: k! _
  ;; initialize the global variables that hold patch agentsets" J" K0 b, ^1 s% f; L
  set roads patches with
7 g$ X. Q* G# Q5 C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% ~4 m5 v+ s& t; r# H4 a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% O: J& o9 b: t8 F( |! y6 h/ V  set intersections roads with2 F8 t; w5 j1 ~" s6 p- W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 E# ?" y& W3 M8 k6 P    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 M3 m4 i4 K+ I5 V. R2 |9 R0 t) [, M; }
  ask roads [ set pcolor white ]3 G/ L, [5 u- x4 [
    setup-intersections
" P5 ^0 S- |6 }* o( ]* Q+ u, f3 v* Send
& U& o! H1 S% D其中定义道路的句子,如下所示,是什么意思啊?
% t& {) f- ?3 y  ] set roads patches with
" L* l" V2 @/ ^5 P7 J5 C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  R8 i% v) x6 @0 g0 e    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: a. l2 Y8 F# x( _- @6 U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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