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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。
5 `5 {6 K. i( U6 [% \4 ?netlogo自带的social science--traffic grid这一例子当中,4 A- N+ u: d# l
globals/ ^2 V9 C0 ^; x) N, }% p
[% x- I3 \- f  B5 b6 ]" T) V$ X
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# s3 m) e& S+ z8 W" X* ?
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' J! x$ O( ^% X! o  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
3 G9 j) O( v: K# e4 E9 y                           ;; it is to accelerate or decelerate
' T- Z6 y7 U% l+ r4 g. b+ h  phase                    ;; keeps track of the phase
% W7 E0 q, g% @+ z! z. @! F! _3 D  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure( i/ E9 `" U. Z  N& ]* m1 S1 H  B: |
  current-light            ;; the currently selected light
' T' h# X1 d; U( @& ^4 q4 Q
& k0 D9 m( V- ~: g1 r; |  ;; patch agentsets
+ z- p0 |, o3 S  l7 I1 y: ]  intersections ;; agentset containing the patches that are intersections
: k; a1 n7 A6 j! z; _  roads         ;; agentset containing the patches that are roads
' F0 v' W6 f7 v1 {. w4 e5 ?]
4 {1 f" j; P0 j+ P2 {. _6 h
+ s' G  b2 z! p7 H* tturtles-own
* l1 f/ t; |, j[
. J5 _* R( U+ q4 b1 h$ ]# R  speed     ;; the speed of the turtle5 }7 Q! a/ c+ ^6 B# H9 z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 B" d& i% b7 y% M3 L
  wait-time ;; the amount of time since the last time a turtle has moved/ A' H1 [; n4 L) X! _
]5 ?2 h" D0 G7 b
! z8 R. \3 [* {! v. ~( l- q
patches-own1 q! U3 e5 G" h! e* n8 k
[/ v" w' h! g$ R1 Z
  intersection?   ;; true if the patch is at the intersection of two roads0 l2 P8 L$ h) ~* J% d
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
) C- K- A3 C! A; j% m8 R) q$ j# f; h& n                  ;; false for a non-intersection patches.$ H* u2 Z1 j8 E( H8 n$ R1 S/ a
  my-row          ;; the row of the intersection counting from the upper left corner of the1 B% E- w. U, E4 a# A$ w% i) D
                  ;; world.  -1 for non-intersection patches.
" H3 h8 p# I# q! g  my-column       ;; the column of the intersection counting from the upper left corner of the
4 F$ c. c# a/ D5 |                  ;; world.  -1 for non-intersection patches.4 E7 q2 g' |% G  f* M1 ^3 R
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( y! g: ]' }) {& ~& `" B! X
  auto?           ;; whether or not this intersection will switch automatically.9 }' Y7 f- L: Z9 x" b1 d$ B
                  ;; false for non-intersection patches.3 Z; W. p0 s% b8 X0 T3 D
]
! I  Y3 l6 h; E& \  b5 L. S1 W* l& @8 @% Z
  ?( A% i& m4 U- Q, x3 n
;;;;;;;;;;;;;;;;;;;;;;
% z5 l7 a, R) z! };; Setup Procedures ;;# p$ w8 Z4 v! c9 S' k) M- D( G8 z
;;;;;;;;;;;;;;;;;;;;;;; s' ]0 [1 {4 V" O/ h% E
/ O( ]+ a3 h( t; i8 h$ K6 v- p' `" g
;; Initialize the display by giving the global and patch variables initial values.' ^4 l, I; I" n; F9 R; y
;; Create num-cars of turtles if there are enough road patches for one turtle to
& ^7 g5 X* c3 z; X;; be created per road patch. Set up the plots.* J/ i( _  q; Y6 y3 u  [5 y$ }! B
to setup# A4 D" N  V0 n. s
  ca5 `& F. L) c: {
  setup-globals4 T8 D; I0 l1 M8 M% v
5 {- k: J( x0 u( b/ H4 P" ?
  ;; First we ask the patches to draw themselves and set up a few variables
) ]! C8 i( ]5 g0 M  setup-patches! w' Q0 {# v  ^' D6 M2 c6 U, ]
  make-current one-of intersections# g6 s8 S) n% A$ c
  label-current& Z4 x) k9 t+ B

6 W8 F( ?) ?* v  set-default-shape turtles "car"7 b' w, E) {2 L

' I/ ^6 V' {6 }; A9 z3 M% U( A  if (num-cars > count roads)
! F. }3 |; N8 ^: i8 T) n  [7 H4 R6 A) q% I3 k* r
    user-message (word "There are too many cars for the amount of "
- t- y8 @$ L* N4 @1 x8 A                       "road.  Either increase the amount of roads "
( l0 ^& \. B5 Y8 q                       "by increasing the GRID-SIZE-X or "
4 ^+ O0 e( x8 F                       "GRID-SIZE-Y sliders, or decrease the ", [- R- `; ]) T/ Z$ u/ m
                       "number of cars by lowering the NUMBER slider.\n"
' v, p$ q/ E- S! G  o                       "The setup has stopped.")
7 K- R& U3 p. o1 h) E4 y    stop
$ T& |% ]) C+ C6 T9 c  ]3 Q& X/ N5 D, k9 `" P" |, z

9 ^$ y2 m; ?1 x6 r! Y# \: X  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 V  m8 o, t, _
  crt num-cars
( D1 A# D$ t- J* J% x9 P  [( V) T& R8 z7 k- ^9 S% N
    setup-cars8 L4 B" w" ~- c1 Y* \
    set-car-color
& M0 `* R* m' g2 ?9 L2 l0 @8 M' o    record-data
( i: h7 K- d- F  ]- o3 {% o. K8 N& q2 S
' g+ S3 s/ Z- g* A- K* [( _7 ~9 o. b
  ;; give the turtles an initial speed
+ e' A, Y* }  U  ask turtles [ set-car-speed ]9 \$ J6 l- r+ J2 v! G0 t. p( W4 ?

9 m" i4 c: h  d& T  reset-ticks
1 J; M3 g( ~" W, Q7 P8 @6 Yend
3 a! i; _% u: R6 i
& B, }6 F, n( A4 y- b3 t;; Initialize the global variables to appropriate values
& s, C8 i6 Y+ R7 r$ kto setup-globals" d6 o5 m0 h4 D; Q  _+ K5 R
  set current-light nobody ;; just for now, since there are no lights yet
6 [, x8 E  ~0 ~: j  set phase 0
  @' q, Z0 u% p8 e  e  set num-cars-stopped 0
- r9 W+ u  s4 [, |6 N: I  set grid-x-inc world-width / grid-size-x) F) \9 T5 V, p) w5 @; j
  set grid-y-inc world-height / grid-size-y
5 Q( r: M5 d/ w1 f$ T; G, s" L9 k" p* W" ?. T6 q2 v9 p
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 j2 B& b; @' `; Q: Y  set acceleration 0.099
* k& ]  K4 `  U, S. H, U6 rend
: a: [3 {; t! R  }. y8 a1 d' t
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% [' i+ E6 Y0 S* Q8 c9 _" F
;; and initialize the traffic lights to one setting9 i3 d, w+ q" Q+ D# b' V; r
to setup-patches
+ K% @9 }! G! r0 ]) V8 S' S0 k  ;; initialize the patch-owned variables and color the patches to a base-color/ ^& r# f; T8 G( p
  ask patches
9 T7 v- X. R+ [+ O  [, _6 K; H" C( |1 T
    set intersection? false
2 B% i6 y7 |' _2 L    set auto? false
$ l& s9 X+ c: x2 K& H    set green-light-up? true
! X+ I/ H; o' P0 M/ _    set my-row -1
* x1 P) @  D+ @0 R" R$ z( d% p    set my-column -1' [1 R6 Y, t; h% w# J
    set my-phase -1
. }& ]/ |  E7 Y3 s+ V, L    set pcolor brown + 3
0 W! k4 [2 q& e3 m& P) y  ]
* ~5 c5 @' ]+ o  e! _" z; ?5 Z% K: y% N
  ;; initialize the global variables that hold patch agentsets
3 ~* \3 I9 k/ c: u! Z/ a5 m  set roads patches with- O* w. c5 _, r# C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% V- N3 M3 C" o3 x' ]1 ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ @# _$ D0 A$ P  set intersections roads with' J$ l/ G( b! \+ e) C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* z1 U2 x$ Q# z" m8 b/ s: W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! J. F% X  H. ^5 w% K
+ W' t9 n) O2 v4 U2 V* g& f2 I5 A( C
  ask roads [ set pcolor white ]
8 ^! z, g1 z( I, r% v$ Z3 N    setup-intersections
9 k; G2 }3 K* xend
% q3 [& M. v  z1 |' G- v其中定义道路的句子,如下所示,是什么意思啊?
0 q8 ~( q) d0 m: t; C9 u. A set roads patches with1 `  k% e, U6 Y* T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 ^: j" M8 g2 q0 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ _5 z& K* M+ q; n* ]! n5 d: A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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