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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。
# M! C0 H$ d' t0 Q$ c% Fnetlogo自带的social science--traffic grid这一例子当中,) z5 g5 d9 t) a
globals0 ~6 {; F# d7 r! U, c
[5 S1 N2 t. y8 G; }/ j+ W: [
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
7 s4 Q4 S% S2 X) g  grid-y-inc               ;; the amount of patches in between two roads in the y direction
2 C) H; R6 I$ p& v  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ ?. Q: q& r+ Y
                           ;; it is to accelerate or decelerate
6 t( _2 t+ R! I" \, f1 J  phase                    ;; keeps track of the phase
! t9 k: L; S4 c! l  O; l5 |  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ Z& N$ F: D* X% Y  current-light            ;; the currently selected light! A* p9 D' m. N6 j4 K% {* r& V

6 m: d: o5 ~( |  ;; patch agentsets5 y/ X" [1 S1 Z. v+ Q9 v
  intersections ;; agentset containing the patches that are intersections
- Y* C: I# n+ m! q6 y, @6 r3 U% ~  roads         ;; agentset containing the patches that are roads1 g, V/ G& n/ M" S0 v8 O
]
/ q* |4 v2 W7 @2 x4 ?( H+ X1 k/ `6 Z" k0 |& I
turtles-own
/ L, j1 J& ^7 N1 \6 p# U) k- H[+ K: }  q) H& w4 M' F: A4 C
  speed     ;; the speed of the turtle! O7 t! ^1 h8 v7 z& p) P
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right- q7 s1 A7 {9 W
  wait-time ;; the amount of time since the last time a turtle has moved
6 I1 h! n- s: n7 a; d- Z]
3 b1 E* k4 L' d5 a0 J
$ q8 K& c2 {- ppatches-own
2 |4 e6 E( d/ R- Z7 p[
7 N7 U" \+ R0 l: i& g1 u9 ~  intersection?   ;; true if the patch is at the intersection of two roads
; L9 E( G! q* \6 Z3 y5 T  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ Q% b, G0 \$ m, E7 f1 B' a7 {" t! k" Q
                  ;; false for a non-intersection patches.
. J, D! r' s) Q* w1 {  my-row          ;; the row of the intersection counting from the upper left corner of the& t( T! G: i$ O0 c0 x, B. r
                  ;; world.  -1 for non-intersection patches.6 l" V7 _- [  O
  my-column       ;; the column of the intersection counting from the upper left corner of the* }0 y* c& t* p* P2 }0 ^/ n
                  ;; world.  -1 for non-intersection patches.# [; r1 u% _) L+ |6 a& S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% R1 I2 c7 J# s# f( w3 P  auto?           ;; whether or not this intersection will switch automatically.8 p! T/ u* ^+ ~" O7 @/ V
                  ;; false for non-intersection patches.
8 O& z) e# T& \/ R  M- v]4 o9 z2 H( c0 S! h

+ j  p6 F( T2 u% R0 E4 ?/ V
; \( h3 z9 d4 b( c# Y  m;;;;;;;;;;;;;;;;;;;;;;$ v7 x6 ]9 y5 [9 @8 n7 C
;; Setup Procedures ;;
/ O; e$ b- P: P;;;;;;;;;;;;;;;;;;;;;;! Z6 X9 z2 T! G1 T! Y& ]" r$ Y
8 |% O1 p$ s1 m7 S
;; Initialize the display by giving the global and patch variables initial values.
$ F' m( c& y, @) J;; Create num-cars of turtles if there are enough road patches for one turtle to0 W. r+ I7 {3 s( w0 C, w9 s, Q
;; be created per road patch. Set up the plots.
6 `# u8 R5 `* f) yto setup
( ]: W7 U- A% m% n* ~5 ?  ca
& ^5 @  }3 Q4 f; X) b* K; H% J/ Q  setup-globals
  |( @; Y8 h, Q% k  M& o  G9 ?! h+ T& T
  ;; First we ask the patches to draw themselves and set up a few variables
; j& f( q4 P, a0 U4 f  L  setup-patches
' T2 X% a9 E* |  make-current one-of intersections# ^( A) m, s: q6 v9 Z. Z
  label-current$ }3 z7 z9 h  [) K7 _& s6 r) o

- t2 V5 U& F( p) f: j  set-default-shape turtles "car"9 _8 u# I) r- N" N6 A* q' M+ |
; w7 H% N- c+ D0 a
  if (num-cars > count roads)
% e5 ?# z3 b, q" T3 A) L& T/ u" r  [; N! z7 L6 V- B9 y
    user-message (word "There are too many cars for the amount of "" m( z7 O2 j9 g8 N$ H. V. n
                       "road.  Either increase the amount of roads "" U$ H. F* l( `" ]& Q
                       "by increasing the GRID-SIZE-X or "
, U; N1 b" l. x* k                       "GRID-SIZE-Y sliders, or decrease the "
& x4 ]9 I# j* t$ l                       "number of cars by lowering the NUMBER slider.\n"
/ u# {4 [' u: c* t' A                       "The setup has stopped.")
& ^/ y! p# s4 ?2 i: b& J    stop! ~/ {4 F* [/ E# ^! C* J
  ]# }' C, ?- E6 c" u5 f

9 R+ k$ z- J* C9 m  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 m% A1 |' L8 b1 F. S! O  B  crt num-cars
& Q- g5 |& I) g6 F! m9 \  [( W0 N" w7 M1 I2 O
    setup-cars
( X2 z, c. A& w    set-car-color8 v  e7 E6 F$ Z! A
    record-data
6 I5 C, O5 s. E2 P0 j: I! n  ]
& F! K* x+ I2 o0 s! P" J, J
7 o3 v# b. p( Z3 Q# X. ~' ?  ;; give the turtles an initial speed7 G" I0 H; v7 A! q/ \5 o9 Q
  ask turtles [ set-car-speed ]
1 t  v' Y7 ^6 @. D5 ]2 {
! Q9 g) L  f" B' `% \. L. g  reset-ticks8 k. m" g  E; O
end. E6 h; F5 I. t" u" w" Q1 |

5 ]* y* Y- E- [) M* o* Z, O;; Initialize the global variables to appropriate values% @3 J, b# N2 }- V8 L
to setup-globals
* u" V( s2 S: Z' J; D  set current-light nobody ;; just for now, since there are no lights yet
, v* G6 `3 [1 s" ]3 C  set phase 0, y* y; ^! X  B" t7 [
  set num-cars-stopped 0
% l/ P; a5 L7 G  ]' W  set grid-x-inc world-width / grid-size-x
# V7 ^. C% R+ x& f/ w3 a  set grid-y-inc world-height / grid-size-y
+ w  p7 a9 j$ |( c3 e0 J; }; a+ Y) z- [- x- N. X1 W9 `4 X) V7 r- \
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) h# w2 Y$ Z+ _( H, Y: T3 v
  set acceleration 0.099
" a9 D; O/ s1 w9 f# R! L9 y1 |end
, F  Y7 M4 s! ^7 [* ~( B' f$ b
5 C- q2 I' U: y+ h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' i8 o9 j1 V, f5 e; L
;; and initialize the traffic lights to one setting  n- M$ ~! k- B* o; N
to setup-patches
4 l& [2 p$ ?% k- T! \# i, U4 ?  ;; initialize the patch-owned variables and color the patches to a base-color& Y* L. D2 l# C$ p& d4 K- y
  ask patches
2 B9 a: L. i' q1 _  [3 d, }, S: b# E2 t
    set intersection? false
: G/ ~, r8 p1 x* O    set auto? false/ v7 y! b1 j( `/ i0 I* O
    set green-light-up? true
/ z& F$ ]# ]5 Z9 B0 `    set my-row -1" D0 t2 y2 t  t9 F7 K+ N8 I) U
    set my-column -1
5 T" g3 K, g! C. Q& ]% B) j" r/ s    set my-phase -1# y; ^6 O/ Y' E7 j' b0 e' e
    set pcolor brown + 3, L- A: U) [4 H2 c, R7 v, w
  ]
' {( g8 v' W7 u6 \7 }& x" x' f: w
( |5 F2 k9 y; s2 S" V. f0 {  ;; initialize the global variables that hold patch agentsets! U: Y$ W2 `: Q% l2 V+ ^
  set roads patches with" M  a( b  w% p" ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 ~. o2 ^6 `3 d' _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 e, g7 ?& s% x$ S& O7 o9 o
  set intersections roads with9 t; o8 G# g1 {
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) ~* ?- o+ P, e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 I2 k: q8 o* o( y+ D6 D
, F! i0 b. l# L& I
  ask roads [ set pcolor white ]9 T* E$ I& x7 h# b0 {
    setup-intersections7 ]. h1 [: S( t+ b/ C
end
! R3 B& Z, K* `! g- s其中定义道路的句子,如下所示,是什么意思啊?8 H, T1 B0 F" H# I; o3 v
set roads patches with( s$ W. Q9 B! q$ z% {2 {
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 b8 h! @0 y& |# t  T* X5 f. _4 O8 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' [1 ^8 y2 a. U2 G" 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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