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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。6 r. X  y0 ~" ~  G
netlogo自带的social science--traffic grid这一例子当中,
% y! o: E2 L( L0 J3 Iglobals
, g8 ?9 h5 N& R, l4 |[
/ d+ f9 {  w, s  grid-x-inc               ;; the amount of patches in between two roads in the x direction% Z/ m7 s9 g9 n, L
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
+ j3 [3 N% K& ]6 @% f  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% w; z) R# R* q: I                           ;; it is to accelerate or decelerate
! x% A+ d4 I+ ^  phase                    ;; keeps track of the phase
* a& S: N2 e2 q7 I  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
8 m) y& C- h- ]1 H4 d  current-light            ;; the currently selected light
6 b: ^2 E& v% [8 I( l0 a/ W. ^* }( _! {  G( j+ U3 b
  ;; patch agentsets3 Y2 m- {4 W9 d7 t; }% G
  intersections ;; agentset containing the patches that are intersections2 \3 f& K5 W; a" |
  roads         ;; agentset containing the patches that are roads3 [2 t' o4 b! u- C* _2 y9 T+ j
]
3 z9 L% Z" K0 i* y) D3 }9 K- |) H" L+ d% R' f& f
turtles-own
/ J$ k8 B1 \- T4 i) Q5 C/ {[# r2 ~$ g4 ~" {2 A, X+ s
  speed     ;; the speed of the turtle
$ j" q$ t$ L4 C5 e3 }$ B' s! t  up-car?   ;; true if the turtle moves downwards and false if it moves to the right) h" h! @4 M& V$ S
  wait-time ;; the amount of time since the last time a turtle has moved/ X, B# D" o( V1 D4 P( f, O
]
8 [6 x9 `# c7 C5 C* w1 F) w
# q# h4 H9 Q. i& H( n1 V' \; Vpatches-own
$ f: ^! b8 ^! B8 o% K, ][
9 W: z1 J0 T7 P* _  intersection?   ;; true if the patch is at the intersection of two roads
/ v9 o" Q$ a' z2 f. c7 r5 U  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
( g- @7 s  p: X" w" m                  ;; false for a non-intersection patches.
; g* ~7 I( p/ L7 K) U4 b  B* n  my-row          ;; the row of the intersection counting from the upper left corner of the
: m% H! N3 b( I. C, C                  ;; world.  -1 for non-intersection patches.' \9 T* D# ~/ }( r1 N$ ^  G# E5 B
  my-column       ;; the column of the intersection counting from the upper left corner of the
4 O% W& u9 g7 \3 r% @4 J* W                  ;; world.  -1 for non-intersection patches.
5 U! K) u  w2 c  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.+ C1 ?- [8 r, K4 {% `& A. T
  auto?           ;; whether or not this intersection will switch automatically./ ~5 f  n: k) J$ P( i
                  ;; false for non-intersection patches.  i7 \/ ]! j8 L7 f
]
) K4 y7 n5 O  L4 J, Q0 |" v
/ Q( k' i  F& G2 J+ ^& ^
# ?( d5 K3 C: U8 {;;;;;;;;;;;;;;;;;;;;;;$ v& f8 \0 D5 N3 f2 }
;; Setup Procedures ;;
, }0 ^9 W4 f  F3 u# O' }9 ]1 z+ G;;;;;;;;;;;;;;;;;;;;;;7 E: D, I  k; i+ A* H+ h

8 p: {5 i" M3 Z* S8 ?) o;; Initialize the display by giving the global and patch variables initial values.% T/ z6 z; g: d) y
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 n% q0 c) y2 t. l0 C( {) L;; be created per road patch. Set up the plots.
& |8 ?9 c! S' q8 i/ ?" Bto setup
; X$ }. z9 Q, O5 M2 W& Y  ca
0 R  f6 t5 Q. \1 K$ w" o" s  setup-globals% d) U/ s1 ]( y4 r+ Y
# b6 d) r0 a2 ]. L% X1 t2 \0 b' e
  ;; First we ask the patches to draw themselves and set up a few variables
  e) X8 [! `; h/ j3 z4 z  setup-patches) T7 Y" i% a/ ~3 X* C( |: ?
  make-current one-of intersections
. C  p8 [$ p, L& D3 ]9 k  label-current2 h5 f4 X" M- N( i2 A% Q& ^

/ {# c" {3 ]# |, ~% G3 e  w  set-default-shape turtles "car"
' K, ]. c7 @/ x6 ^8 W4 l1 Q6 {/ A& v# m1 p
  if (num-cars > count roads)$ W# A1 N1 V: |9 ?7 K) D$ ^
  [. T: y, |7 C4 P4 {* I' g8 p3 W3 U
    user-message (word "There are too many cars for the amount of "  o- J; n% o& d4 K% W- {  P, e: r
                       "road.  Either increase the amount of roads "4 w9 y) j6 k2 w1 p
                       "by increasing the GRID-SIZE-X or "
9 V% {% Q3 J& w6 v, G6 j                       "GRID-SIZE-Y sliders, or decrease the "; o: K; W1 \* d, {) x8 T
                       "number of cars by lowering the NUMBER slider.\n"
& B8 W3 m1 P" H' z1 |# u5 i& v' f                       "The setup has stopped.")0 o* Q1 _) k9 n8 \' c
    stop' s; t$ R6 E0 N# h
  ]
. F1 l. ^2 s, O: z* Z: h2 x' U* p5 r" t/ u2 p! y  I
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 Z) {/ }% u+ Z( r4 J8 E
  crt num-cars- w* k) b# G1 S
  [  t' x# Q- H. e0 K; j' s9 q5 d9 R
    setup-cars
2 F* q$ `( j" O) p: I    set-car-color
2 i2 ]4 K1 q4 ?& Z9 Y4 {    record-data  n9 E, ?: ~4 R! z4 [' v4 n
  ]& j' R9 P# t2 v% }9 I9 \

# a4 H9 a5 X+ E& }" b  ;; give the turtles an initial speed' a6 o, x: {! O0 _' F2 c
  ask turtles [ set-car-speed ]
8 m, t0 r7 L3 X* i: H4 `+ N2 ]9 b* ~4 {
  reset-ticks! s( T: r- i8 _2 ?9 D7 J' J: j
end+ s) y" a% @; N* q

- {8 p3 ]8 q5 _0 l) ]8 Z! [;; Initialize the global variables to appropriate values$ o' ?" {- Q6 U2 O/ \) l# R) I
to setup-globals
; D" Z" x* M. w3 n8 G/ O6 C1 @  set current-light nobody ;; just for now, since there are no lights yet# b/ p6 r1 O7 R, v, Y
  set phase 0
. K- X  K. v4 m. t  set num-cars-stopped 06 L# z/ L9 _+ k8 S" S- p* i. W
  set grid-x-inc world-width / grid-size-x
* c+ y9 }7 f9 T2 a- y% k' f1 A  set grid-y-inc world-height / grid-size-y
9 W5 P4 `: t( I( B' g  k% U: j2 N. Q2 B" A8 Z' l8 B
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) T* f- b- W" |. |# A
  set acceleration 0.099
3 N$ l# c7 I3 s% M& F3 qend
: @6 h% U# j* z. @0 ]7 l4 I% ?4 b- m3 ?  F0 ^' L
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# L& H( J& I8 y
;; and initialize the traffic lights to one setting
$ G  g- g& ^9 gto setup-patches) d5 P( z9 ^% q1 U
  ;; initialize the patch-owned variables and color the patches to a base-color2 y% Y6 \7 A+ ?6 m% D
  ask patches
6 l8 s& H# I/ r# S4 x: _9 m' D. Y  [! T# J- }, Y$ n7 L' d' f1 W
    set intersection? false
$ O3 G! W9 e. p  O+ w    set auto? false! b: s( h/ S5 Q0 _+ o. A
    set green-light-up? true0 \/ ]# L: `2 P+ t5 q  J! S
    set my-row -1% a# |% u0 V* [: g" `8 t
    set my-column -1
& }: ]6 Y; a# S5 f" D: C0 {' p    set my-phase -1% b0 S7 w( t6 c( }* g* C  z
    set pcolor brown + 3
( i* e: j4 l0 K6 ^0 k  ]* o5 v' m' m! k) t+ @7 J+ p0 z3 J
: ?0 U+ r5 P. V" Z
  ;; initialize the global variables that hold patch agentsets
/ u7 S6 J/ @# D7 y5 N  set roads patches with
& ]7 n& z/ _  p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 ]/ Y5 m4 o2 Z6 E4 D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ R7 J; k' s: q. d
  set intersections roads with
7 s( G; l; Y2 c5 c/ b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ a, W% b; U3 Z4 ~' G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* v" w! q3 d1 L2 o7 u" [
, ]$ C) `8 m  i. E. {' V; k, Q
  ask roads [ set pcolor white ]
/ X4 Z1 m) z/ _9 b4 G5 X9 F. e    setup-intersections5 N5 G9 n' _) x) ~* K, X) T% e( z
end
( X3 _$ }9 X! f" x1 ~9 q: k其中定义道路的句子,如下所示,是什么意思啊?
# D1 b2 y0 h; Y7 [, G2 g# X, f* W set roads patches with
" L! a/ t. `) E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 T+ _& U4 H7 M, O7 X7 X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 l3 u1 ]$ t' [* {7 G' 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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