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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。
0 T- L( _: g* v$ F7 `netlogo自带的social science--traffic grid这一例子当中,9 m$ X: g/ S0 O" S' p: F
globals* V5 O8 j  A$ q; M+ K) h# u+ P
[1 J4 O) J" L9 j8 [
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 N. b4 S' n5 j0 t- X  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. y4 D; e, \+ r; @/ |! a* G  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
  j/ ], K# _5 A8 _9 A$ I4 x                           ;; it is to accelerate or decelerate
: P3 s. Q& Q" K6 N" z  phase                    ;; keeps track of the phase
: m6 Y1 A1 ]8 D$ y  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ y/ r: Z( y6 E
  current-light            ;; the currently selected light
' m) g) {  }7 z( H, a# ]& E
9 C; N0 j4 _* `  ;; patch agentsets$ C: W. k8 U6 W' O- x6 G: P, p/ p: y
  intersections ;; agentset containing the patches that are intersections* D, D; D- u, Q, q- S- ?6 ^' m
  roads         ;; agentset containing the patches that are roads
  K5 d. u7 S0 n% u( Z]
, }, t) _7 V8 g* x3 o6 ?  @8 i* g' T8 a: x1 c- h8 V
turtles-own( w) D" P3 c) H8 Z/ b! w, f9 e* O
[
/ ]0 t* F8 a) R. T  speed     ;; the speed of the turtle
' R/ v% _! p) {3 K0 `  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
6 C( f+ E# P8 b- p3 s  wait-time ;; the amount of time since the last time a turtle has moved& E& F$ R6 }6 }% O
]
# M8 c  T6 G2 ^% U7 R2 l
; e8 S" Z: N/ x! g# upatches-own/ G- g; I- |) S# S- r
[& h8 I1 q1 j7 T7 a; F3 c
  intersection?   ;; true if the patch is at the intersection of two roads* n# w  o: K) T' ~. Z# J
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. u" d; l% G6 }" s6 d
                  ;; false for a non-intersection patches.
% ^& T$ W( W/ V% i/ k/ i  my-row          ;; the row of the intersection counting from the upper left corner of the/ v' P  T! V1 m0 d+ V( x
                  ;; world.  -1 for non-intersection patches.
; r7 H5 Q4 O1 W6 e- R5 G4 T  my-column       ;; the column of the intersection counting from the upper left corner of the
! Y4 {. w% T# `                  ;; world.  -1 for non-intersection patches.9 ^! q& r8 \& M. x! z9 c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.$ G$ y* Q) i* J* I3 Y
  auto?           ;; whether or not this intersection will switch automatically.& W; m& `% ]9 v
                  ;; false for non-intersection patches./ p5 v% a5 n% R) X( D4 K0 f- \
]
$ D9 z4 s. d2 @6 P. s1 w9 @9 ]9 z/ k
8 D# b  h( X$ X/ q" I. l% p
;;;;;;;;;;;;;;;;;;;;;;( X) O7 z  O" d% O4 X& q+ a( i) I8 h
;; Setup Procedures ;;4 g9 `0 y( x: \8 Q
;;;;;;;;;;;;;;;;;;;;;;3 a# p; s( X% y1 i2 i! v- @
5 J% H( u) _0 A2 l5 H3 d
;; Initialize the display by giving the global and patch variables initial values.( F! U* R# g: i! r2 n& s
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 j3 y7 \. }/ s" |* V2 C;; be created per road patch. Set up the plots.
8 K! L1 _+ {" d! \to setup8 O5 U* ?8 Q& h8 z+ B
  ca# ^0 H$ v$ z: X2 j+ T
  setup-globals
/ T7 t% s" H; U! z0 Y
& M( \0 x3 v) G  l9 g: s+ {5 U( K  ;; First we ask the patches to draw themselves and set up a few variables
; L. J' q8 p0 L% R4 j8 a) g  setup-patches6 u* d9 p$ L. H9 l+ s" M. \  H  u
  make-current one-of intersections4 O' B$ N2 f. Z3 d
  label-current% S/ F# ?) M% I: c3 d
/ Z; J2 M% C: @
  set-default-shape turtles "car"
! h5 V0 |3 e' X& J
) l1 C" y' M* H5 ~8 @  b  if (num-cars > count roads)
, x- j7 Z: X3 b+ P4 f0 R! V+ H* m  [
2 c3 q* [+ _9 s5 K$ V    user-message (word "There are too many cars for the amount of "7 h7 c2 k& I+ U" n1 G
                       "road.  Either increase the amount of roads "
+ r5 r& i- F9 s+ F2 F- f7 n; L( m                       "by increasing the GRID-SIZE-X or "- z3 L0 O0 M( }8 k* r
                       "GRID-SIZE-Y sliders, or decrease the "5 t% e+ y, o: q- p: ^  n6 m3 M! i
                       "number of cars by lowering the NUMBER slider.\n"/ ^2 ?+ N; K& H3 k
                       "The setup has stopped.")
2 o. H; A+ V& r' K# b    stop' J; |/ @+ `% r/ d! o6 s/ x
  ]
- A# J( h. }0 v$ b' T2 X. S% U" P
7 z+ W/ n/ p8 y8 O; Z9 @( n  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ g- r  f: ?4 c, Y4 e  crt num-cars9 _$ Y' k, L' N  w! n5 K1 R
  [4 ]* g+ V: J8 v" f9 }4 u( u' q# t
    setup-cars
; ^) r& f, d& Q( r    set-car-color, O7 n9 w7 X2 x1 V) p
    record-data
6 }" o) E; f0 i2 f" R1 O% h! ?6 @7 I  ]
2 e  b" F1 T% ~6 I3 g& L# m6 T4 {. F- `/ Z4 N& U
  ;; give the turtles an initial speed+ r9 u3 `' P3 |
  ask turtles [ set-car-speed ]( ]' D3 L5 z& \& q

/ s- _  e! d; @' p! r  reset-ticks
2 Y1 B7 o9 n9 Z8 Q' {end; d5 B% V1 M* M3 c3 v

& K/ x$ B" y  R! i2 l  c;; Initialize the global variables to appropriate values( I3 H( Q0 Q0 K$ s7 K8 G
to setup-globals
+ |  G0 G! p, M: c, b  set current-light nobody ;; just for now, since there are no lights yet
4 _3 S, s9 b) L3 h( B  set phase 0
9 g7 d4 a+ d0 j' j5 N. z  set num-cars-stopped 0
5 K* m- |- A0 X) a# G  set grid-x-inc world-width / grid-size-x3 t8 |/ i6 r) \* ~: W
  set grid-y-inc world-height / grid-size-y6 P8 C9 f/ y5 p6 p: Y
0 u) R9 J. p7 \2 }
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* a0 N# R) o3 g, k/ p5 `0 T* ?
  set acceleration 0.0998 T- X8 O7 F2 ?) s3 {4 B9 x
end$ k2 v* X7 O* `
6 ^3 {% ^& s$ Y8 H* ?5 Q# L- x# Y! _. w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( \4 q8 ^, O4 d8 F/ |: J- N& b
;; and initialize the traffic lights to one setting; F0 c/ H# m9 @# M6 P1 ?
to setup-patches
1 |' W. G4 z. q' r5 C  ;; initialize the patch-owned variables and color the patches to a base-color9 ^6 ~+ `0 d! t& U* W
  ask patches
$ E5 T- N/ q* \' P- h  [2 b" t% Z( A, F4 \. v0 Y. H+ O8 Y
    set intersection? false! ^, `5 {# U# e$ n9 w: _0 _
    set auto? false4 q- S" e6 m8 ]! _% n- P2 X  T
    set green-light-up? true+ n$ Q! T" {9 Q. g' J& F. G! C
    set my-row -1
% W8 m* o3 m2 }, j    set my-column -1
' U( f& ^$ V$ s9 D9 v7 \' ~    set my-phase -1
, q5 t; p7 E0 [0 ^3 }2 q2 e    set pcolor brown + 3
6 O3 H- p2 e% W- a  ]
" {! k& e& w+ |1 d+ ^& Q! X, w, ^0 C/ L0 f1 J0 a/ P
  ;; initialize the global variables that hold patch agentsets
$ e+ P/ h9 ^( m5 X  set roads patches with% L* D7 h# k! s5 N5 g. d
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ ]' F) M" S# k3 J9 e" I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% i6 ^! U* n$ H+ |( w- _6 s
  set intersections roads with
! p8 {' R% X# L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 e! g1 t6 c$ t( k1 e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, D8 s# T9 O6 f8 {' h; S# e. s4 e! m. ~' C" O; ?& h
  ask roads [ set pcolor white ]; Z$ _9 ~& w  n( @
    setup-intersections: r$ e3 y8 N, n, H; p
end
5 k! j. P& s( y% {/ x/ j5 Z其中定义道路的句子,如下所示,是什么意思啊?
/ n/ J; [, D- j' L  M0 E set roads patches with5 H2 m* C2 ]6 w+ |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, |7 A$ `' A, t7 D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" G, _; o* z# b6 ]2 E' I/ Y
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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