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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。
- B7 v$ v4 M7 V- k6 anetlogo自带的social science--traffic grid这一例子当中,
, r! d8 H4 c5 q  T2 N9 Pglobals
8 @& I( H6 A# O" G& {6 A2 ], d' z9 w[
0 c. S- L$ ]  l5 c9 k1 R! a  m+ J( N  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 |+ h) y% l; e9 K3 d7 H  grid-y-inc               ;; the amount of patches in between two roads in the y direction8 E- m! y* p: j/ K& I+ _% C
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
6 i* G0 o& M& W4 `  i8 w) ]                           ;; it is to accelerate or decelerate
: b$ j3 h% W5 W/ E* G: Y" e5 x' W  phase                    ;; keeps track of the phase
4 q6 n9 y& q. I  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! x% b# c  g# ]  D. j$ a% e
  current-light            ;; the currently selected light- @( u6 z+ }0 i+ N% f7 I( ^$ |

7 C3 N3 A" e+ d% h: B' M  ;; patch agentsets- N, U/ H) t0 h" f
  intersections ;; agentset containing the patches that are intersections
( G0 [+ s9 k. n! L1 _1 q5 n8 a5 t  roads         ;; agentset containing the patches that are roads
8 B7 Y: F3 j4 V3 s]
/ H5 L) T  x% I: ?+ t) f! y3 u- c9 W; N7 r4 a
turtles-own8 B4 y& S1 R2 p3 {  U
[  ^! B8 u7 H; I& I
  speed     ;; the speed of the turtle" O5 \. f2 q% c6 F1 i5 E
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! s" }) i& l; `6 A) x" {& i  wait-time ;; the amount of time since the last time a turtle has moved$ q, Y- ~; y' T1 w
]
4 S0 o$ I  y) J& z, w% q. n# h1 C0 P. ?- m, n4 ~2 d
patches-own
4 ]% W# g, V" N5 X5 T[
6 d% n( q* Q. q  A  intersection?   ;; true if the patch is at the intersection of two roads
* y! s/ N# B  i) _5 c  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.3 _# ~' Y. u; q4 X
                  ;; false for a non-intersection patches.6 ?4 F# g" F6 @  }& D9 s  g  _
  my-row          ;; the row of the intersection counting from the upper left corner of the) L9 t! z2 Y5 K9 Z
                  ;; world.  -1 for non-intersection patches., b" P) C! q+ e# z  e
  my-column       ;; the column of the intersection counting from the upper left corner of the
& V! J% `- U* d) K, A0 `                  ;; world.  -1 for non-intersection patches.
) A! h# ?  h/ |: A  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
0 z/ m2 H- n6 e- R) _  auto?           ;; whether or not this intersection will switch automatically.: A; c) ~1 W0 n& ?5 U) U
                  ;; false for non-intersection patches.7 O: c7 K1 [8 h+ u0 r0 h
]! |) T7 O  X) ?' x# p% H  ~

( W: _5 w. a- \4 X: R' e1 [8 j" w, T  k4 J2 \3 a! }4 Q& i; A
;;;;;;;;;;;;;;;;;;;;;;" l% ~$ A$ l% L" I& ^3 ]
;; Setup Procedures ;;
' w0 D& u6 K4 n$ C4 @4 Y$ k% w) r. O;;;;;;;;;;;;;;;;;;;;;;4 ~6 G2 e1 X- w4 Z+ o- p, F3 O
; B3 u; I4 |$ O7 e
;; Initialize the display by giving the global and patch variables initial values., @9 W$ q" N5 r1 T
;; Create num-cars of turtles if there are enough road patches for one turtle to8 o1 l" T/ o( K4 A' U
;; be created per road patch. Set up the plots.
- P0 Q% R! ?9 Rto setup) \' R( l3 q1 `' ~2 ^
  ca
; w( t: N" j% y  setup-globals
3 R4 i4 g- R& B5 K$ Q) l
) s7 I% K8 I4 ~* N5 q& S3 X  ;; First we ask the patches to draw themselves and set up a few variables- X- R) u/ _* f% B
  setup-patches/ m. E) Q% y7 t& S/ a
  make-current one-of intersections$ x1 p. O' D. H, Z5 u& r) @/ K
  label-current
, [9 L- t4 n5 k( M$ F$ [" V! s; b: n  k& Z
  set-default-shape turtles "car"9 }2 ^7 ?- q- i0 |9 x& D5 r

; |3 s  G0 g6 e. Y, X8 D  if (num-cars > count roads)
. [; [* b, S7 Z  [
2 E2 I3 j& q; t0 d1 U1 S' a    user-message (word "There are too many cars for the amount of "
% i) n; N, H" T$ A& {! M+ L" l7 Q                       "road.  Either increase the amount of roads "
1 L8 c3 {/ A9 ]0 ]$ }                       "by increasing the GRID-SIZE-X or "0 o& u% W8 P" k6 ], z) Z
                       "GRID-SIZE-Y sliders, or decrease the "
: a8 b4 b- @) d! s' m2 ]. m& @                       "number of cars by lowering the NUMBER slider.\n"0 C% x- T9 C; H, t' q. E
                       "The setup has stopped.")
; c. w! h0 `5 w& ]    stop- x/ S0 I/ |! N
  ]
0 t0 ]- }! B7 Z- Z* i/ I( M) Z+ I. J9 K5 G
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% ^% q9 Q% G! b  Y  M  crt num-cars$ h9 u: h3 o# X. s: L) \1 w
  [
, A1 r7 M7 f' @    setup-cars
$ B( p9 ^- }* C9 E9 b    set-car-color
3 @: M6 ~- L2 c    record-data
# [" v3 q/ ?! l4 d2 ~6 j" e  ]
( F9 L: r2 h9 o4 Z) Z
0 e6 o& d8 x/ O$ z- H  ;; give the turtles an initial speed
4 k- v: [6 E3 ]7 I* P  ask turtles [ set-car-speed ]/ B* F2 `% {3 d$ s  v
6 V+ z& B& J5 s5 N+ l" R3 r
  reset-ticks1 p% g3 ^( T% _+ G" @
end
9 V& ?/ O6 z. s+ V0 l" V/ E1 `7 S8 B8 v1 b
;; Initialize the global variables to appropriate values
  h; M3 G8 Y) ^7 N/ Z. Cto setup-globals* k2 K8 _9 X3 k
  set current-light nobody ;; just for now, since there are no lights yet
* H( V$ q8 d/ ^6 d# W  R  set phase 0
: o% V  O; D* U* D6 m8 O! h# J) V  set num-cars-stopped 0. i* _2 o6 f5 \# y! M
  set grid-x-inc world-width / grid-size-x
2 D& v, A2 f5 s5 N  set grid-y-inc world-height / grid-size-y' Z1 [0 M7 ?) ]/ c3 b$ ^3 j" W' [

& C0 j& A! ?% k6 Y9 @( C- Z& w  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ C3 x+ E7 [' u3 K# z6 b2 x2 ]+ _
  set acceleration 0.099
9 A& C/ i8 x6 L4 L+ e* L  p: N  Dend. f1 B0 f# z8 P7 D

. H8 @* n* @+ n2 N;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 Y/ L% v$ N! l* |0 v% d;; and initialize the traffic lights to one setting: t$ P# B$ _; @$ H
to setup-patches
& e- K. |, X& z0 }4 E  ;; initialize the patch-owned variables and color the patches to a base-color
' h$ C. c2 K0 b% a3 h9 r  ask patches
0 ^, Q: ^5 p8 D7 f$ m8 ^4 H: d4 _  [  U' \% J9 r8 R4 X3 R# a- ]
    set intersection? false
- X& a% ]9 y) ~5 w    set auto? false8 Y+ G2 n% G( F( o9 ~" K
    set green-light-up? true
- S, F9 K% I8 m1 p% H: y1 n    set my-row -1' a' A; G. Q! ?
    set my-column -1  p- g) T. J  k8 j
    set my-phase -19 @  I5 C$ [% T* z; M* C, Z( y
    set pcolor brown + 32 _- h! t# W, O% j0 ?7 Z' v
  ]
" h9 n, Z: D2 w6 u3 H5 D8 H  o! d2 X7 l: ?/ t1 k  s
  ;; initialize the global variables that hold patch agentsets
2 R& W) U: m9 ^" `  set roads patches with
! P2 |  i8 t: ]    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 n, R' [4 E" o* ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! R4 p3 _% M0 h% \3 r; U4 S  set intersections roads with/ k5 i8 e9 k5 N0 M" P( b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ o" p7 f+ J5 y) ]/ p- B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# q$ \9 s, W! }2 E7 t1 H

1 E# e: [4 s1 Q3 J3 J! [4 V8 ]  ask roads [ set pcolor white ]
/ Y/ [* W, ^5 |8 z9 m4 i" X6 U1 D    setup-intersections
- _" ^. B) w. n" D* X& n8 vend: ~" j* h$ X4 \! J8 h! l
其中定义道路的句子,如下所示,是什么意思啊?5 m( j; e2 e2 w+ t7 t+ M* L
set roads patches with
9 a0 |' }' Q, s/ N- |( v    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 Z8 m6 o9 j. b) D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ o" Z& ~. a7 |4 y: |# t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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