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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。
; ?) R# a4 d- T5 l0 ynetlogo自带的social science--traffic grid这一例子当中,
% ^  u3 y, n) r( m' ?globals- O# v# T4 R: ^6 J, e+ B
[
/ [2 a  o9 X6 J9 Q  grid-x-inc               ;; the amount of patches in between two roads in the x direction
( ~/ z; G4 X! H& x- f9 z  grid-y-inc               ;; the amount of patches in between two roads in the y direction- v, i9 p1 Z0 i5 D) \/ m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
2 s# J# n' q% T1 u/ |                           ;; it is to accelerate or decelerate
! a4 b4 L& C# J) `/ v% i  phase                    ;; keeps track of the phase+ v0 e$ S3 R# r
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 l/ O3 _: A+ T3 C
  current-light            ;; the currently selected light7 Z+ b7 J2 z* C; ^2 ^
& A. n  t* v; x# m: y( \* F& N  R
  ;; patch agentsets
, _0 M( d( j8 G4 x, h* G/ P  intersections ;; agentset containing the patches that are intersections
/ A/ E3 d& _0 N- e& x7 T  roads         ;; agentset containing the patches that are roads
/ J* [6 h6 C0 C], x3 b3 ^- U( _# ~) W/ w5 W' I: Z0 }

. m8 {8 [5 b" }) f  P8 b  w/ a/ I+ |turtles-own
4 c3 G2 N( O' w& n1 \* Y$ j[4 ~' c; }% r! o/ {
  speed     ;; the speed of the turtle
: p: Q( Q6 v: {" D3 ?$ g; u8 d/ U  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& y$ r5 b0 a8 }; F+ h  T1 H  wait-time ;; the amount of time since the last time a turtle has moved
1 U6 n* U9 u' B0 Y4 K+ R" Q% d]9 J. E/ ]# n; L
: q, g% ~1 F4 c( S  X
patches-own9 l$ A- }$ H% c+ u6 J# J
[
. g6 t# A, K9 H) C. u- o' o3 Z$ h; |5 i  intersection?   ;; true if the patch is at the intersection of two roads
  C" R# j+ V8 {. p6 y. n6 ?* q, W  w  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. X4 `1 _1 o% O' G, \0 u! e                  ;; false for a non-intersection patches.- S) l, g5 ^! G! ~% ?+ P" N' Q
  my-row          ;; the row of the intersection counting from the upper left corner of the* w$ u7 a3 N! @$ v& G
                  ;; world.  -1 for non-intersection patches.6 o+ s5 n- g, u9 t- }
  my-column       ;; the column of the intersection counting from the upper left corner of the; E3 x: Q) U8 m( n6 Z$ `" f& Z6 r) C
                  ;; world.  -1 for non-intersection patches.# I. p. X: U1 P" i1 `6 B1 W; a" J
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.- P" \+ l7 y5 d( P' b3 T
  auto?           ;; whether or not this intersection will switch automatically.
. T+ \/ \' o) y. n! D7 F8 C                  ;; false for non-intersection patches.
% F# z& Z' C- H4 o  |]
- R9 x7 c# k, ]2 \2 D2 |/ g
* y( ?# j( [5 l5 L) i6 |, l! e6 T  c# ~2 W; e( y
;;;;;;;;;;;;;;;;;;;;;;
( g  J3 ?" d& Q8 h' j' O;; Setup Procedures ;;
& @! G' H7 q: O% ~/ Q;;;;;;;;;;;;;;;;;;;;;;. Z. `% q$ Y# @" [2 I% L

4 d6 O7 o- R- n/ u1 q& d1 _2 v' u;; Initialize the display by giving the global and patch variables initial values.7 R  T* k- H4 K6 |4 j
;; Create num-cars of turtles if there are enough road patches for one turtle to
! G) c' Q6 I/ Y* D0 {1 [7 n;; be created per road patch. Set up the plots., @, S' Z2 e# `- ]
to setup4 P9 |5 n3 t- y4 f5 d0 D) T/ K5 e4 ?7 k
  ca! v( T' W- o. J0 P) O# p& e1 {) y
  setup-globals
& f! a$ B9 Z+ T# \, h/ e% S
/ u: F: R' P! W- {$ ~" Z' O  ;; First we ask the patches to draw themselves and set up a few variables
& c, y' q# b, S  setup-patches+ r5 a# l4 G$ B
  make-current one-of intersections
) i2 W$ [3 u( m( K, P  label-current
+ R! r6 Y2 u; \" T) v
% Q5 l* h. E* Z1 u: x/ Q( Y  set-default-shape turtles "car"
& g# G5 X, v9 {% F$ S7 }& T  ?. q8 n, H5 g% @' e5 P& L
  if (num-cars > count roads)( z9 z: Q0 G7 ^- |5 O" w+ r8 C
  [
/ M2 W, s8 o' O  Z; e" t/ ]    user-message (word "There are too many cars for the amount of "
! O6 [0 v2 o# T                       "road.  Either increase the amount of roads "! j4 Q9 \2 F- _  f  ]
                       "by increasing the GRID-SIZE-X or "( `# A5 O- O9 i7 y7 @7 x
                       "GRID-SIZE-Y sliders, or decrease the "
2 k* c% \7 W6 W5 q" I                       "number of cars by lowering the NUMBER slider.\n"
4 @9 u) A7 s$ |" R) @# z                       "The setup has stopped.")1 }6 c( q, P' a# l+ s
    stop
; {1 d$ A' M( {/ C  ], k* O. C. x% r  _

7 ?, y7 u' @7 l$ m# N/ l; u: N  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 x' e4 o7 p+ Z! s5 A' J) R1 k: P
  crt num-cars
0 [% o8 Z) |' Z# Z. m5 [  [* N' f2 |$ F% `/ x
    setup-cars
* B' R4 V/ I, |) A  E7 i( x    set-car-color, B( c- r6 L- u' l4 K; Z( y0 X
    record-data
4 c/ ]' K& V/ B$ c9 D  ]/ v/ E$ z/ y$ z
/ `) g. M) }$ {2 B5 d
  ;; give the turtles an initial speed
# `) G) r% b' s* @5 J8 }  ask turtles [ set-car-speed ]' A6 v9 s2 T' _) c* l) D

0 o& D1 R$ F4 c4 N3 `: a/ D  reset-ticks) \0 M3 R: Z8 o4 K1 S& Q; @
end
1 {7 b7 p: g" {6 p7 ?. E9 v/ Y) d, T
9 P+ @# R9 K, ~;; Initialize the global variables to appropriate values
: ^4 e$ {: E4 y. sto setup-globals
4 }; t" A+ o+ L1 |$ C& N  set current-light nobody ;; just for now, since there are no lights yet
( P3 I- ~5 h8 o* @1 z! t  set phase 0) q; F/ U( ^1 P
  set num-cars-stopped 0
3 H9 N  s* F' d$ H/ e& W  set grid-x-inc world-width / grid-size-x8 M4 N  ]6 g. }
  set grid-y-inc world-height / grid-size-y
- y+ O' p) M8 d1 @3 ~! l  r; Q1 E3 d' N7 n! Q$ a
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 n- j0 ]6 ?% _7 J, ]* [9 u7 F( x  set acceleration 0.099  ~+ @* N1 z7 A+ R0 ~; B
end! H6 i  L6 c; x) ?* n

2 [# L7 u  n$ p9 O: @;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: ?1 \( b$ u  M2 ^0 F;; and initialize the traffic lights to one setting
8 g+ ~4 a9 B7 T. K$ u- d$ cto setup-patches( Y" X5 _0 `5 N* t3 h
  ;; initialize the patch-owned variables and color the patches to a base-color4 I; H9 j( i# m( O: f; k
  ask patches) E: D4 |8 I/ r# \9 L- F0 H, }" P! {
  [( x0 ]2 r6 i6 d$ j" V
    set intersection? false2 ?; x9 ~: g# c. R+ ^
    set auto? false( z; X7 a3 {. e% }5 N$ G+ a
    set green-light-up? true, i+ ]  E2 `5 e/ g' w
    set my-row -1! R( G! i* A# |( G
    set my-column -1* b, H0 y: A" h. a: O1 B, T
    set my-phase -1
' m* y! }) G3 z    set pcolor brown + 3: l4 c7 R  s. o* V
  ], y/ ]3 E4 B8 E/ z( [. H5 a
' W0 ?$ R; h) @/ K
  ;; initialize the global variables that hold patch agentsets
7 x1 F1 m# I6 @, D0 ?8 Q7 a1 g9 f  set roads patches with
3 W2 ?/ o8 i6 z" O, q% H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- p5 T7 j2 @1 G0 C- j* G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  f* w2 N$ \) l4 y  _  I
  set intersections roads with
- t, W8 P" z) G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  P0 J' [/ L. i$ J/ W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 X- r. F/ _9 F* S* [8 y2 C6 E! g  i. }+ U- K" r& j
  ask roads [ set pcolor white ]  t$ |6 [# v; P8 t
    setup-intersections
/ z4 g# D0 B5 r: o- Y' a+ R; r/ pend: }% s0 l$ B! u/ {; \! ~4 I
其中定义道路的句子,如下所示,是什么意思啊?
7 V8 S. `0 [9 L/ Y- w set roads patches with+ t3 ~) s, U0 T! o7 M$ I4 U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 \5 w7 k+ F$ `7 w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" M& S$ z- p5 @' V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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