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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。
) }" o  R( y/ y$ F' V- M* W4 g" Inetlogo自带的social science--traffic grid这一例子当中,
' H9 q6 `9 _) f9 u: k5 dglobals8 i  p; R$ h1 @) L
[5 k; i5 S! X8 r2 i; C
  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 s5 j" ^, e8 ?9 A" q% N* n
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
4 z% C/ P9 ?& w8 P. ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' Y: n  K! \: Z8 p2 ~4 H
                           ;; it is to accelerate or decelerate
$ H2 n1 h2 M" k# O/ E  phase                    ;; keeps track of the phase
  h% \# Y) q! A1 S4 x  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure/ U. _* J4 s( G' F0 X
  current-light            ;; the currently selected light- O) r8 N$ U. h

# \5 l9 t) \; P( N6 P  ;; patch agentsets
6 b2 d2 g, T5 p3 a! E2 s  intersections ;; agentset containing the patches that are intersections+ x* |1 {) Y+ h
  roads         ;; agentset containing the patches that are roads
0 y3 L& S4 g- \6 t]
6 p- {$ Y7 n1 K  W& S
% ^/ Z; w; b8 ^% T, P* r+ k% }turtles-own8 ~9 B' Y, @; [1 ~1 f. U
[6 m- Q1 O' D& @/ f
  speed     ;; the speed of the turtle9 K& e9 s: ~: v# j6 h4 P3 R. X
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& ^. r. `% Y2 P- v7 q  wait-time ;; the amount of time since the last time a turtle has moved
+ v6 V, c7 J7 J: r]
: w: Y" @. W! U5 k+ q
9 T8 r- ~% z  z# I: fpatches-own7 `; B) j: ]2 O( i, e
[: y% F4 w9 {3 o: n, {# j
  intersection?   ;; true if the patch is at the intersection of two roads
+ B) f: a) o8 K0 j  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
- e* E* E) [# {                  ;; false for a non-intersection patches.
6 ^, k6 Z8 b/ ^" \6 @! g7 N  my-row          ;; the row of the intersection counting from the upper left corner of the7 ?) k& J) d  b5 E
                  ;; world.  -1 for non-intersection patches.
, N5 \. K7 @6 i6 H  r" k  my-column       ;; the column of the intersection counting from the upper left corner of the
) d; G6 h0 p3 U* B, g! ?7 M  e8 c7 d                  ;; world.  -1 for non-intersection patches.
- c5 j( o- [" Q! [6 E4 t# H  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 a1 l2 w6 E6 ^# _- Q  auto?           ;; whether or not this intersection will switch automatically.
7 E2 C+ l6 x& K4 O! N( _                  ;; false for non-intersection patches.
8 Z5 n# J, n' w1 T]4 p) P" w" ^& p: Z- P6 x. n2 g% K
( z. k# j4 T, R/ i, ^1 s/ [

9 f) w8 d6 u& Z;;;;;;;;;;;;;;;;;;;;;;
: ]; K- r  j* l) S9 B  _- E;; Setup Procedures ;;  X5 @' ~) Y& M( J2 G; @) P0 i; V
;;;;;;;;;;;;;;;;;;;;;;, F  g, G0 V3 G# W7 E2 X0 Y
& u( u, L0 n) q/ x
;; Initialize the display by giving the global and patch variables initial values.
4 Z1 q% |  f2 J' j) F& J$ m;; Create num-cars of turtles if there are enough road patches for one turtle to
* s  K0 z9 _- p/ l; ~;; be created per road patch. Set up the plots.
1 \# p' X$ X: h9 E% Y3 qto setup. n/ B( H2 l3 |# q) S  Y* T
  ca
; S3 J6 ?# T2 ~. i1 y9 `( }  setup-globals3 {: I3 u, M7 c
/ m6 l+ ^2 s' p5 l
  ;; First we ask the patches to draw themselves and set up a few variables
- K/ V3 _4 m$ M. N- @  setup-patches! R0 E! e" q% s. w2 p8 \( E5 A
  make-current one-of intersections
( W& d! V8 r8 d$ Q  label-current+ m) G1 ?; G7 z

  j. o: T4 E* _5 u" }  set-default-shape turtles "car". a( v1 @6 E7 h" o  ~, ^1 Z

0 S* ~* H+ R8 b) l  if (num-cars > count roads)+ E2 v0 {# v8 g+ `
  [/ B' M' R! c' S) |: N' I& a" j( C) \# j. t3 F
    user-message (word "There are too many cars for the amount of "0 ]  s1 H" A, R! S, e) X' m# f* i" m
                       "road.  Either increase the amount of roads "' `* R8 d' z* D  Z; b
                       "by increasing the GRID-SIZE-X or "
+ {8 A. h8 d) s                       "GRID-SIZE-Y sliders, or decrease the "! X  v& ^; U% _; @" x7 h
                       "number of cars by lowering the NUMBER slider.\n", c' ~" S( \+ Y5 h5 D- W
                       "The setup has stopped.")5 i- B, u( v; q  `# p) D
    stop
( @8 ~% ~1 L( O1 P' w5 N  I/ a  ]0 K: k1 ^- o: X9 Z2 i6 K: ~0 O9 _

6 L# p; C6 y2 F1 d: L) v  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 {6 E% l( {0 _7 K  crt num-cars
+ I5 k& Q4 s5 C3 t+ j  [
- u& t1 u) X* T1 b6 W2 s* X    setup-cars' j' j  A: a  M- e
    set-car-color
7 k. R# e& j; g4 D3 T3 X5 z- U, z6 v    record-data  @. X0 n3 ]3 K* V7 S4 s
  ]
" _. y$ n1 ]4 X7 R4 ~6 u  v4 b: u6 E- J; q) ^' `) z: g1 P
  ;; give the turtles an initial speed1 X" _3 {  a9 g$ ~8 D* K# M6 o
  ask turtles [ set-car-speed ]
  Q# B6 Y, `. N  d$ }0 O4 q3 q. W% ]; b# P
  reset-ticks
9 M9 D" V. Q  |5 L! i) R0 ?( Wend3 A, _4 F( J9 E; P$ _( {
& O" L, w7 k0 \: A  i
;; Initialize the global variables to appropriate values, W% {* ^  T* s9 f. L
to setup-globals
0 L+ q8 _! \- g  set current-light nobody ;; just for now, since there are no lights yet
' [  G3 Z2 [. C; p- L  set phase 0
. \' G! |3 |' D) `1 I9 w0 p$ P( |  set num-cars-stopped 0
( q. r) k+ r! P5 ~  set grid-x-inc world-width / grid-size-x
( D: G5 }  `! ]9 o  @6 T  set grid-y-inc world-height / grid-size-y
( ^) I; x4 y  B: M( h
2 f0 ^3 T5 k5 K  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) @; o4 X- g  D5 ~; a7 k9 L6 [  set acceleration 0.099" k+ L$ B4 b1 L% V/ |
end6 S* l3 |" G4 z, E- Y
6 v. q! r+ B& l0 ^7 E6 m; l
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 J$ p/ o! M9 L! D0 G
;; and initialize the traffic lights to one setting3 ^0 ~+ V  `& C* K5 s: j$ e. t0 `4 \
to setup-patches
% d" k7 C: W+ n! K  ;; initialize the patch-owned variables and color the patches to a base-color3 c9 e+ |4 M& U* E, k( w
  ask patches7 e# ~8 `+ Z0 S- Z2 |+ s' ?5 L
  [
: S6 b6 [/ _2 |" X% F    set intersection? false% q8 v- h4 O& N2 ~6 B9 e
    set auto? false
6 V8 Q2 B7 w) }) k4 a, ^6 G    set green-light-up? true
5 ~$ W0 f% Z: [$ y    set my-row -1; ]% |& L" J, H! X
    set my-column -1# C4 v5 x" s8 I1 j" O
    set my-phase -1
5 X! v' ~& V/ G% k* k  [9 C    set pcolor brown + 35 S. d  M0 S( c, y7 t
  ]! I7 [- l( |* k  D. I1 P
, a9 b* E  @# |) ^3 w
  ;; initialize the global variables that hold patch agentsets
9 V! {+ W7 F' f; H' |  set roads patches with
! I) L$ y! Y3 D7 B" K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ {0 o- a0 w: z* f8 i" Z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' J7 h. @1 k9 t
  set intersections roads with
8 k, ~' w9 P' N# q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ f" J+ [) U6 J& W- G. G6 L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 J5 g1 {7 {  k* @
6 Q0 @6 [6 A* x1 c9 e
  ask roads [ set pcolor white ]
# t  N0 X- I5 |6 h" G    setup-intersections
* o9 y" }: r$ G" a6 Bend
; a  h% H2 r0 K+ U% o* q! _其中定义道路的句子,如下所示,是什么意思啊?
! c! E7 [# r' B' P' j% q2 F# o6 r0 \ set roads patches with" r) A$ G, M' l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ y4 h$ O: Y" m: O2 @4 T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: @- [( T0 W& }, v, 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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