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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。4 G) i) Z0 N0 _( }+ }
netlogo自带的social science--traffic grid这一例子当中,; O9 e; y3 U6 r2 {! I
globals
. ]  ?( G0 G7 i7 G5 w, o( d+ m[
2 G' h1 F- }& m+ C  grid-x-inc               ;; the amount of patches in between two roads in the x direction
7 |+ l) f% u0 C. N5 q  grid-y-inc               ;; the amount of patches in between two roads in the y direction
8 g, h9 a6 O  I: F9 g  Q) ]) t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: L4 r8 y! b- l$ x                           ;; it is to accelerate or decelerate
+ ]8 O1 ~. z/ o2 w$ I8 m* {  phase                    ;; keeps track of the phase. ^9 [1 J( }. a9 Q4 Q
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure, F! L. \% a  `- A$ m' m3 D
  current-light            ;; the currently selected light
: q# p+ g) p& [$ k
/ }7 |+ B: C5 @  ;; patch agentsets
3 z( j7 \) {6 n$ ^6 H  intersections ;; agentset containing the patches that are intersections
( f/ e( ]3 I$ n, \: V9 d: z$ T  roads         ;; agentset containing the patches that are roads4 M* q$ d8 U9 O, J7 k4 K2 T8 e
]4 ]+ N+ [1 w" R2 ~& o
; y. h5 C" T4 h
turtles-own* e5 j- _- s9 E1 S
[
, N; G7 K+ \3 E  speed     ;; the speed of the turtle  c& u# o  y/ W0 e. g
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. B) K' S+ `% f! i, O. _2 a, P/ ?  wait-time ;; the amount of time since the last time a turtle has moved8 [$ d1 E8 D5 q! U9 I' q
]5 h+ S+ w. f0 S$ k2 J9 w0 h
4 E( ]0 B& {& K% @
patches-own3 e! Z  p) O: N3 E% H3 }3 m; L
[
% Y8 f2 U; d2 o! j: ?  intersection?   ;; true if the patch is at the intersection of two roads" E$ p1 H) n% _. t% r9 X2 m
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.& Y  Q* R! X8 k; P
                  ;; false for a non-intersection patches.
; ]) [3 L# \" e3 z6 h/ H  my-row          ;; the row of the intersection counting from the upper left corner of the
7 ~( b1 B( s0 w# Z                  ;; world.  -1 for non-intersection patches.
; W' Y2 B, w  U  my-column       ;; the column of the intersection counting from the upper left corner of the9 h9 Y' A9 l' n" U, F4 N& Q; y
                  ;; world.  -1 for non-intersection patches.+ I# f1 d9 m- o$ N1 ~6 x& D
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
8 i2 a$ E- j( w6 k% o  auto?           ;; whether or not this intersection will switch automatically.
/ v* ]$ K1 `3 M  E, V                  ;; false for non-intersection patches.
) R0 t8 H3 V9 z* K]
& \1 ~5 n& K6 x, M6 _# r# d0 M4 k/ x$ ?9 m% }9 a+ l$ B8 u
7 h" q  U+ r" P6 ]' m, a5 B
;;;;;;;;;;;;;;;;;;;;;;- [" S# F  l# u7 q, N# ~  |/ \
;; Setup Procedures ;;( r, |4 d# |$ V5 Y  ~
;;;;;;;;;;;;;;;;;;;;;;
! d7 n# U* o  T4 v0 n
7 j4 e4 u7 h" W2 h$ T% W;; Initialize the display by giving the global and patch variables initial values.
. }) t% E0 ]0 g: U;; Create num-cars of turtles if there are enough road patches for one turtle to
/ i) c3 o1 d6 q5 w- Z% X) F;; be created per road patch. Set up the plots.& t& s6 u7 S3 ?- u4 d6 b
to setup
  g: U9 b; q7 x( w  ca
3 E$ T: l) o4 J1 a5 R  setup-globals
3 n2 B" C* Z. i, o1 |7 ^/ m1 }2 J5 O/ _1 ]5 A: u4 B, ?) C/ w( t
  ;; First we ask the patches to draw themselves and set up a few variables
6 |; v4 u- [2 n0 m; k' G) ^  setup-patches
6 @3 l$ j/ y' X  make-current one-of intersections& H. }. @5 j( D0 X5 y- [) d( e9 J
  label-current
, W" [5 s# I! m; p; j7 P. ?/ N8 X0 k: {% k1 j! b: q
  set-default-shape turtles "car"5 D( k( m% V# ~9 Y( p  u1 W4 V; }
2 n1 \2 y% X8 w8 A) S
  if (num-cars > count roads)! ?1 \/ q& y0 A; B6 ?$ [/ \
  [
8 n& R0 i9 O5 a    user-message (word "There are too many cars for the amount of "7 t# U/ O- t) U
                       "road.  Either increase the amount of roads "8 H4 [* q9 w9 G3 _
                       "by increasing the GRID-SIZE-X or "
7 Y* W+ D; }! f  o1 T                       "GRID-SIZE-Y sliders, or decrease the "; H( C. o, f$ E) S4 x
                       "number of cars by lowering the NUMBER slider.\n"6 ?4 a4 f$ Y8 G2 ]+ U
                       "The setup has stopped.")
7 l( D" g, z: d/ p- r1 e    stop: Y, V, X: G+ t) r
  ]# a1 r# O7 [7 B% P0 R$ J/ b. r% m/ A
- ]! y% F3 B2 B1 a% W; V- ~
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ f9 D; _+ e% q: {
  crt num-cars% X4 w- p( B# E2 w& c: a; L
  [* [  k/ ~. s- E6 K' }
    setup-cars
( J1 P( g6 s2 w, M# ~    set-car-color
- a6 n+ A2 Y$ u  D    record-data% z' y3 T! a# H& C8 D
  ]
$ \9 N" G: g1 h+ j* v
" p8 u0 U3 }$ |# U( U4 |  ;; give the turtles an initial speed5 s( ^" b( [, J' H8 `$ q
  ask turtles [ set-car-speed ]
' S5 r: }# ~0 f! u! O4 b. l6 W! m/ a/ b2 r
  reset-ticks
$ m9 q8 j# |6 Vend
1 I, m$ ^2 ~) a( l" J; {& ?8 F7 a  M
& N$ d$ @  _$ d( S;; Initialize the global variables to appropriate values
! k1 W' G0 j# Y9 r/ u1 }, z* nto setup-globals
, ]. c# q- q5 U/ Y" l1 a  set current-light nobody ;; just for now, since there are no lights yet, @7 Y* A! y2 p. {1 S3 `- Z
  set phase 0, G# L  W9 u  O# i2 X# {
  set num-cars-stopped 0
* I- K' z2 b. n/ e  set grid-x-inc world-width / grid-size-x
  ~$ J; C& T" ~# }9 N  set grid-y-inc world-height / grid-size-y
5 ?9 S% F0 }7 l* g. T2 _1 T! R% ]! ^$ n5 r' J: l
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! |: i! x2 T* U( C2 a  set acceleration 0.099
4 M* e) ]- J5 m8 R. k; n) f1 p( qend% l+ x1 \4 h' l' y5 j" L/ T, T! }; g

* E6 l/ H9 ?. y" Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets," {9 `4 ?8 h0 z& ^  M. u: d
;; and initialize the traffic lights to one setting& \9 E0 T  W7 u+ |1 F" m
to setup-patches) Y3 K: w# `; f
  ;; initialize the patch-owned variables and color the patches to a base-color
% D9 x2 a* Z7 y  ask patches
+ F+ ?; L% ^0 b+ J! ]4 d. L9 n  [
; f! g; A( n$ s' x    set intersection? false: V) b( `6 o- `) I
    set auto? false
4 r% x/ _1 c# `$ X    set green-light-up? true/ ]7 r2 e6 ]3 I7 Q' h7 X
    set my-row -1
4 [# u6 s, a; A+ g    set my-column -14 j3 H  M$ |! h( X. n8 U; F
    set my-phase -1' j- |+ m& [1 {& ], X( Q
    set pcolor brown + 35 r* k0 f. |9 O5 F- ~5 \( [
  ]
- K7 N* T) Z8 }: Q
: b% u. [4 D7 W+ p5 {  ;; initialize the global variables that hold patch agentsets
, U) d. J# u: X# a& l  set roads patches with
$ `. N  o; v, r6 D2 j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) K. `+ }) O/ G# Y2 H1 x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 o' [6 [. E! L) v; N  K; O7 ~" C  set intersections roads with
5 O% M* T' D% T  s    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
  |2 H4 _3 ]' x% h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! W4 A9 z: r" u% c( Z3 \6 x  z2 D; y/ f
  ask roads [ set pcolor white ]
* b: ~& Z8 h$ I, ~* Z7 ]    setup-intersections; a: |; T) P2 w( L0 G' d3 B3 e0 I
end
: D0 v. Q7 c( @, I' l4 w4 n. M其中定义道路的句子,如下所示,是什么意思啊?
0 E  ], [% J% t, b0 V set roads patches with0 c+ D; ?( @9 b$ R# j) d0 [0 q1 ]% u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! X* A" J. ^+ n5 x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& Q: f1 g, ~4 u- Z; M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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