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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。
  e- I6 r2 Q$ rnetlogo自带的social science--traffic grid这一例子当中,
, T5 y4 a. D$ @- I: X1 V; V8 c& {globals
) Q1 B. u! {  c" r[* h; \# K: |' U' Y; k) J* h  q, I
  grid-x-inc               ;; the amount of patches in between two roads in the x direction- ~' G4 J7 j( ^5 j$ i
  grid-y-inc               ;; the amount of patches in between two roads in the y direction+ Z2 J1 M% x0 z( F0 _. @% k4 g
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) q- A) W+ ^) L                           ;; it is to accelerate or decelerate
  N9 T' Z% q8 C; F' |  phase                    ;; keeps track of the phase
. H) l2 d! m) f9 x  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 w" c% B/ B* v1 T5 c2 ?  current-light            ;; the currently selected light
. A: @* r6 O0 O. J; R+ O. i0 h; `/ g7 f. M7 S% S( J3 R3 L% l
  ;; patch agentsets0 r9 D& A* z' r
  intersections ;; agentset containing the patches that are intersections
# l" M+ @+ w$ [# r+ G, n  roads         ;; agentset containing the patches that are roads
. r; {) O# u7 s3 X6 }]
  I+ V  R% J, W9 D; o0 [# q; W1 C( M' k/ Q
turtles-own! t6 d( \% k' l0 U. {
[/ @+ r% R- u# M; j
  speed     ;; the speed of the turtle$ e+ b& q6 ~+ s" j3 W
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' z. D& T0 c9 h( ^
  wait-time ;; the amount of time since the last time a turtle has moved
0 ]' g, v- y* w]
1 B4 R* l! D0 e0 T4 w& j) ~
8 K! r" Z8 M: O/ }patches-own% E" F9 z9 f/ D# o
[) V: D5 _2 J& P
  intersection?   ;; true if the patch is at the intersection of two roads! t) V+ n5 k7 T2 Y
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
5 Z3 t* C) M4 {+ h                  ;; false for a non-intersection patches." k1 H2 b) p$ ]: N0 X3 ?+ \5 f8 l* P
  my-row          ;; the row of the intersection counting from the upper left corner of the
6 y' E, o/ l' h5 a3 [                  ;; world.  -1 for non-intersection patches.. e- l* Z; o$ x! `0 w' P: H
  my-column       ;; the column of the intersection counting from the upper left corner of the3 ^% B$ d8 B: w) g3 ^( h; z
                  ;; world.  -1 for non-intersection patches.3 B( `( t& p0 S$ w
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 }7 g5 t7 a( N9 m" A( v+ X- }  auto?           ;; whether or not this intersection will switch automatically.  N: m" r& r+ c
                  ;; false for non-intersection patches.
& d6 O. b  [' W6 N2 f# p2 i# r  v]9 O8 b# I$ H/ X8 A$ ^/ v+ F

+ J& N7 ]- f. t; {) G
1 @% k) m) V$ f% P;;;;;;;;;;;;;;;;;;;;;;
2 ?- v# t: S- k" `# i7 }+ n% ];; Setup Procedures ;;
  y9 W( t$ b/ F# t. p$ u0 R;;;;;;;;;;;;;;;;;;;;;;8 M+ K8 @3 f' L: o7 D

- c, z$ p" ]+ P;; Initialize the display by giving the global and patch variables initial values." D$ E6 d3 Y# z- h0 Y" h& Y
;; Create num-cars of turtles if there are enough road patches for one turtle to
  n/ _4 P4 [# G/ e2 f;; be created per road patch. Set up the plots.6 J" C' D. {  _$ w5 {5 C
to setup& @5 h/ H5 v6 S3 e, k) H* {7 O
  ca; F1 ^+ v/ k7 R; B
  setup-globals* w2 e3 E2 {$ u; \' A3 a4 ^

* {, f$ a! X8 w8 U  ;; First we ask the patches to draw themselves and set up a few variables) j7 Z) l1 i: ^0 u( u
  setup-patches
# ]; Z# E% n0 s  make-current one-of intersections
; c4 q2 A  G1 A8 e9 ?- E  label-current% F+ b7 y) `8 s  g; {: w
( C! \, K: |" L( m% O: z" ?
  set-default-shape turtles "car"1 y7 g* A& r* S+ c% |

, g9 U! V6 t# k- {% q$ F  if (num-cars > count roads)
0 D! }" V$ j- Z  A0 V( \8 i  [5 D" I, ]; _" F/ o, B+ g9 p) l
    user-message (word "There are too many cars for the amount of "$ T; j$ u& h7 c2 I1 H
                       "road.  Either increase the amount of roads "
1 Q9 d- }4 s: p                       "by increasing the GRID-SIZE-X or "
' C: e0 Y: M9 S& h                       "GRID-SIZE-Y sliders, or decrease the "
6 }7 k% o% z! r6 ?                       "number of cars by lowering the NUMBER slider.\n"6 |: I3 \: A" D
                       "The setup has stopped.")
& w7 ^, A2 W0 a$ u    stop
0 ~% c' i# i+ |, v; w3 O  F; `  ]( i9 C, K0 H; l" C
0 ]  ]. i! v) T; [, }, Q+ T/ ]1 I
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 d9 l1 g; P6 |3 m0 E8 g
  crt num-cars0 ^: k% g8 E4 \) m2 E
  [% h6 ?+ }  U" X* j
    setup-cars5 v, p( K, @" `" |
    set-car-color- j$ ?6 ~+ g' z' t" x1 @
    record-data
! D- m$ |3 q7 Z& {) f  ]) o$ H' [; f( D# H  o

- G# r. d' u1 K+ A; i5 v  ;; give the turtles an initial speed
! _! |7 n, W4 r  E/ v$ T' v  ask turtles [ set-car-speed ]# D" ~+ c! U4 D* N& A  `

7 w) M* x# S+ I4 \6 ?7 \6 W  reset-ticks
5 Q% `( v( Q# C& R+ M. D" Kend
$ y  r& z" o% l- @
% r' w! S0 A1 Q;; Initialize the global variables to appropriate values
; M4 Z( C4 _' @: ?6 Eto setup-globals
' V6 r+ I( v4 i# [2 f: w  set current-light nobody ;; just for now, since there are no lights yet
# M" W0 e. C7 O1 Q9 r# x( S6 D  set phase 0$ ]0 w* K- f5 B5 s: `2 V3 n/ B
  set num-cars-stopped 06 n' I+ {+ |  Z1 a
  set grid-x-inc world-width / grid-size-x
+ I8 H" r& ~; V, S: u3 J% a: h( }  set grid-y-inc world-height / grid-size-y; O# \! M" H9 I( N* J

9 e# g% V: s" Y& K" ^: |% d" Z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 u+ Q; o5 j  z3 }+ O, h$ o" A1 ]4 c
  set acceleration 0.0991 b' Y$ ~/ l! P/ q6 G; F  Q& }
end
( _, V5 A5 H9 A
( s0 w9 A! @7 q8 `) }; K;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& _# r5 L: `, J4 l4 G$ Y
;; and initialize the traffic lights to one setting' t* Y# m7 c* o. S4 G1 y, ^
to setup-patches/ `4 d8 z8 m* C# ~
  ;; initialize the patch-owned variables and color the patches to a base-color
: }5 f1 |5 ]  _2 o  ask patches
+ i8 R7 W5 |+ t) O' }( t  [
; o2 Y5 b  o4 @+ R1 P    set intersection? false
  i: r8 M/ f& Q* I* B    set auto? false
7 L) F% Z( d) N0 N    set green-light-up? true
$ X( T5 {3 e/ m( n2 _& o    set my-row -1' r9 Z' @. ~5 V: X
    set my-column -18 y$ L6 L6 Y6 v7 f
    set my-phase -1
; k2 y3 ^8 e9 G* v    set pcolor brown + 31 m( c+ `9 \9 G: D& g- Y
  ]
* J3 ~$ U1 d  Q# L
4 ~3 g. d4 k$ ^" S5 y  ;; initialize the global variables that hold patch agentsets
% g4 e3 i( k0 w  set roads patches with
$ n1 B6 o  U2 {% w    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% E+ Y6 b+ e! a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 w& U  K) P8 \& \1 z' a
  set intersections roads with
8 c2 ]. d, c& Q0 J. j3 P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  ]1 P3 y/ @3 D/ w  I8 G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 `/ Y+ n/ j2 u1 K. Y( i& T- l* N1 o6 D/ s$ e; B0 I5 n: f
  ask roads [ set pcolor white ]
$ m6 m3 T" j+ L1 l( s- k, n    setup-intersections( K6 o9 u! u. D' X" f- y  A
end" n% }5 Q3 D4 G; Z9 ^1 P/ f5 W/ Z, X
其中定义道路的句子,如下所示,是什么意思啊?
3 V5 u& K6 B+ l/ H% S7 R- `! \ set roads patches with2 _. p7 \- C5 f% K! i, M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 f2 l, w$ V3 }$ P    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* h/ A4 s- z; O6 t2 L1 J
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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