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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。  U5 N2 T0 I6 x
netlogo自带的social science--traffic grid这一例子当中,# C9 f) V. r5 b9 A( C3 a! p8 N
globals
0 M& X& a1 O4 V0 f8 W[; T) \% w; P; {% Q
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! l1 k. Z( P" f8 G  grid-y-inc               ;; the amount of patches in between two roads in the y direction" m$ ], ]$ Y9 o" y; T+ g  z4 Y
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
( y2 C0 E" a: }- v1 @                           ;; it is to accelerate or decelerate
* S% c* c. t  m+ \5 x  phase                    ;; keeps track of the phase
! `0 C; t  N9 J  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
3 |( c; \9 l: L# Q8 s6 s2 T  current-light            ;; the currently selected light
+ M4 V2 h4 ~2 \; n" r" @8 R' }
$ I6 v" \" Q) \$ ]9 R% l  ;; patch agentsets
. E) F0 ^/ P9 z, i5 A  intersections ;; agentset containing the patches that are intersections5 V* t( f4 ~" v0 A0 H8 g
  roads         ;; agentset containing the patches that are roads$ k$ u5 K4 D/ u! W0 O1 ?
]
) t2 z9 M9 |3 u2 D% G' g/ u- i4 r
turtles-own, N' R$ Y1 u( n. A" ]
[
7 e: B/ N* b  U  u5 p" w7 D  e  speed     ;; the speed of the turtle
( w5 P2 }/ M$ p( v- V# L: d! {  up-car?   ;; true if the turtle moves downwards and false if it moves to the right- I6 F7 p* |& v# n. Y* Q% l" D
  wait-time ;; the amount of time since the last time a turtle has moved
" N& M8 _  \: _]
1 E2 d# t0 X- @- i0 y9 m. {$ P5 h6 Z2 V
patches-own& m0 m/ O% D; N! t. b9 j" x# B' w
[
7 ^$ B! _* X0 Z# x  intersection?   ;; true if the patch is at the intersection of two roads
! Z0 W* [" V- p! N- b* ?5 a  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* b& R0 Z+ Z1 k7 _( \7 v" k3 y                  ;; false for a non-intersection patches.
5 ?) A! c1 c5 s  my-row          ;; the row of the intersection counting from the upper left corner of the  @! B; |, v) g6 z  {, [8 E
                  ;; world.  -1 for non-intersection patches.
5 U6 V" c# _! H) L; D  n, ~  my-column       ;; the column of the intersection counting from the upper left corner of the
  a! s! m  Q% G1 d1 V                  ;; world.  -1 for non-intersection patches.
( N4 _8 X/ Z3 k; g$ r0 J  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; f  y- C2 X: u4 J4 i* ~  auto?           ;; whether or not this intersection will switch automatically.
1 u: ]. t& B7 ]) N, L1 j1 s                  ;; false for non-intersection patches.1 ~3 K5 O' C$ J2 A
]
  v& r  _, x. e
4 Y. T! q5 t) Y1 _+ F
+ C2 _: p  G* G3 ^2 b;;;;;;;;;;;;;;;;;;;;;;+ X4 |3 s; }! w7 {3 X+ q
;; Setup Procedures ;;" W  ~+ X- O" D- B3 [8 D8 f
;;;;;;;;;;;;;;;;;;;;;;
% ?+ X, L! ]# d  R/ ^
6 [- t) r& q8 |: j;; Initialize the display by giving the global and patch variables initial values.% S& D& {" j( y. h( Z
;; Create num-cars of turtles if there are enough road patches for one turtle to5 O/ B$ y* ~+ K! t. R7 ?
;; be created per road patch. Set up the plots.
! Q8 y9 n( i& v9 x. K& |4 ]" ^" s7 ^* Yto setup$ n" b8 a5 m) H4 M: H
  ca
1 J. u8 c3 ], p) G& n  setup-globals1 n* B2 O% e9 H9 U! x* m1 z3 f- H7 I

/ X! _/ `+ j# s' D* i0 K+ v  ;; First we ask the patches to draw themselves and set up a few variables5 j; \$ Q: I( r1 g7 m
  setup-patches
& x6 s5 [+ a% \! y# _; H9 s  make-current one-of intersections' A  T) W9 `; V4 [9 }
  label-current4 m! V' O( d, L. G0 _7 {7 {

, s" @4 {) @7 z& L; q0 v  set-default-shape turtles "car"" q5 O8 c* m5 i

" U' s( h: I+ B$ g) }# h; |  if (num-cars > count roads)
+ c( v7 j" x3 Y' [) u  [
$ y( L- w: W: F7 a    user-message (word "There are too many cars for the amount of "
: @8 ~! ]8 m/ h  k                       "road.  Either increase the amount of roads "
, ]! V9 V4 z. }$ {  q1 I/ C                       "by increasing the GRID-SIZE-X or "4 e  n) I0 u' ~
                       "GRID-SIZE-Y sliders, or decrease the "& N# v. i( ]. l1 @( z0 z
                       "number of cars by lowering the NUMBER slider.\n"$ {4 c  U& ]1 q3 k6 i
                       "The setup has stopped.")7 Q2 n% |- P+ v# ?- Y7 K
    stop! g, j8 k( ^) r9 z/ g, M' U
  ]4 n$ i1 U' W1 q( S8 }; `5 Y
! d6 k: J/ @% j) m
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 m5 ?  `7 Q$ |7 |; {
  crt num-cars. u# E0 w' p3 Z! `; |
  [' m7 p' m5 k5 F4 \; {
    setup-cars
  h  v. P: }0 S' y: k; ?% a    set-car-color, m- @' W/ U5 y& r: d8 p
    record-data7 ]7 }6 G2 ]3 w! Z0 O# w" s, e5 t1 B' m
  ]9 v( S2 ?8 W7 h2 m! s
7 c4 V8 h5 R1 M3 M# P
  ;; give the turtles an initial speed, t# T  S" h8 a! ^+ f/ p
  ask turtles [ set-car-speed ]/ E0 W% ~, C% S" l# r) D
0 B8 c; r" t5 b& {; H5 [' j5 d
  reset-ticks
. {0 F# L( V) [' K! A  C/ c7 Cend
8 M  r% @2 w, B" B- ~( k; e) q% q
$ c7 B. t. r2 L" F;; Initialize the global variables to appropriate values4 I" D* I+ |2 ^3 c! v4 t
to setup-globals& k: l  ]9 H. Z. D% Q4 b
  set current-light nobody ;; just for now, since there are no lights yet
7 C7 x: e& @: M' u  set phase 0
2 b8 s( S* c6 S  set num-cars-stopped 0+ q8 `6 l5 k* z4 ]1 q7 g4 F
  set grid-x-inc world-width / grid-size-x) G1 ^# A( ^4 X0 K2 C; A
  set grid-y-inc world-height / grid-size-y
5 k- N' X9 R. |  Q* s4 L* H7 b
6 C$ Z1 M, w8 m- \" z7 v# k  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! E' r2 Q; J6 K: I- V7 G  set acceleration 0.099) ?; m6 A! u8 p" w( l8 c
end
: \8 c2 i8 x- D. ?5 B. n+ [  T1 Z% d
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: D# s; [8 N! J  d/ l# K8 E$ N
;; and initialize the traffic lights to one setting2 [, ]; O) }: z( p3 i
to setup-patches% d, s  u7 R: J$ ?! @# B/ x
  ;; initialize the patch-owned variables and color the patches to a base-color
" P5 F# B# V5 `& I1 b9 d; @# m  ask patches
( s) e& I* f- Y& G& w1 D  [, ?, n5 X+ B" a" m0 Z
    set intersection? false2 f  J6 t$ `3 o
    set auto? false
* r" `" h* h& k+ p2 O/ H    set green-light-up? true! l; l# B+ y! p' P; I, _- f# }, P3 K
    set my-row -14 ~/ r) g0 {/ \) e( O5 e5 k
    set my-column -1
, O' H" P0 ^  ^- @9 ]5 v    set my-phase -1$ n0 w8 `. L3 N, w/ [0 g
    set pcolor brown + 3
) B9 ^  D1 U7 @  A) L  ]
* b. g) q* V# S" O/ C2 _8 i3 s
; n/ `- M$ X  g  ;; initialize the global variables that hold patch agentsets
& G% s/ W4 G7 h# C( ^  set roads patches with
) }. R0 V' n: u8 L0 P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( f5 @  R" C6 W5 v5 c" P2 E    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 g7 u  E5 Y1 R. W1 i& F! m, ?4 F
  set intersections roads with
" I* ]. A3 C: [! d* P( D$ F) t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ K7 }2 B1 h) d' y0 r3 Z7 K! k$ `
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 u7 W/ g- [& ]2 y7 Q/ y& h
; D: X8 [# }) ?3 f/ W* d" X  d. M2 |  ask roads [ set pcolor white ]5 f4 J) o2 v) s' A% _* _* i$ c, I
    setup-intersections
' M& y" D& ^9 ~4 K/ t5 i: ?end
* q. A! H: B) A  q7 H$ H% ~其中定义道路的句子,如下所示,是什么意思啊?
9 B! T, Q7 ]& V  D set roads patches with
' b. t/ y/ C9 Y' ?0 O: Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ H* U9 ~% D6 S5 l) g) M2 S' S8 x/ j, t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" k; I' ~7 b; f2 f. `8 m3 O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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