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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 ]3 Q. @% g8 V# a! v" Qnetlogo自带的social science--traffic grid这一例子当中,4 ?9 R& A1 `" d9 u  S2 i3 A
globals# R# |* N  f) H' b6 F2 ?
[! Q6 t. l- e2 Z" X
  grid-x-inc               ;; the amount of patches in between two roads in the x direction$ z3 i2 h# H* v5 F# m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 N9 N1 S7 o, _- z
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# Y+ v3 L1 O* j& Y
                           ;; it is to accelerate or decelerate
1 |% J4 e" I- O$ X4 M3 |% i  phase                    ;; keeps track of the phase3 B) `1 G- I+ a  U
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ x: B+ }6 m4 T/ f' {6 p  current-light            ;; the currently selected light: F7 ~, L7 P: p% C9 v
& S: p0 B( i6 [. q) L7 z; L* F1 ?: W
  ;; patch agentsets$ ?: B' c) {# c9 D9 u9 i& H  X0 T
  intersections ;; agentset containing the patches that are intersections
3 w( ]4 E9 V: }# |# l4 t  roads         ;; agentset containing the patches that are roads4 X1 R- b& b& t' p  `6 a
], S+ D$ _) @/ s/ E
# h8 b" n8 J0 F3 e: p
turtles-own& w$ X- m8 x  |  ^6 J6 E
[" A' [" P* U& c0 E
  speed     ;; the speed of the turtle7 L! f6 |1 u% D4 q4 \
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 M$ B8 E1 ^' E! J% n/ k  wait-time ;; the amount of time since the last time a turtle has moved
" F  w# q/ @. Y8 x]
) T6 M& x' c( }, N+ D- l+ I( ]. Q# M, w
patches-own% x  j' @1 P- V- \2 C' Q6 b
[, B4 R, s. k6 k0 v
  intersection?   ;; true if the patch is at the intersection of two roads
2 B' e! s  n8 E( K% E7 G  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* z0 }5 p/ Z+ X" A( u! n
                  ;; false for a non-intersection patches.$ S; ~7 K5 o) j- `. I$ i
  my-row          ;; the row of the intersection counting from the upper left corner of the
; c9 i" P) \' \& I                  ;; world.  -1 for non-intersection patches.
4 P) F0 Y- |) F7 H% a( _* e  my-column       ;; the column of the intersection counting from the upper left corner of the
' @; Z- v8 L" L0 O3 W/ o# r                  ;; world.  -1 for non-intersection patches.
2 a9 i5 {, F7 ~0 E3 e0 p2 I  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' K( }0 |4 f( |# l7 m% p# {* \0 e
  auto?           ;; whether or not this intersection will switch automatically.
7 l: x4 B* b5 e0 B9 H- W  M$ Q+ R                  ;; false for non-intersection patches.: {+ k( L% v7 u1 W
]
. |( j4 P; v9 b% a7 \0 |2 @( @: l! G; N) i7 Y
( E  _9 X, t" O# c6 A; q
;;;;;;;;;;;;;;;;;;;;;;
) o( T, i- H0 I  P0 E;; Setup Procedures ;;
" B' d# G* S( v/ q9 `;;;;;;;;;;;;;;;;;;;;;;; d0 B0 t  u  s) l2 N( i
1 V0 a0 r. a' F. Q0 n$ l# m9 Y) x
;; Initialize the display by giving the global and patch variables initial values.8 i1 u0 U5 n2 a( f2 {- ?
;; Create num-cars of turtles if there are enough road patches for one turtle to, V! Y9 N2 ~3 W; Q8 i( ~0 t
;; be created per road patch. Set up the plots.% @. J$ Y2 p6 [: X: U" j
to setup6 d1 n. i& A2 ]1 [
  ca, y  S/ V7 ~0 x( _
  setup-globals( E# Q+ o/ h6 X- b
4 x/ W/ Y  {& X4 S9 e
  ;; First we ask the patches to draw themselves and set up a few variables) I% p. d5 g; s. r
  setup-patches
% |1 r5 r& e/ n  make-current one-of intersections/ G7 H, J: s1 b, Z! L
  label-current$ j; k# i: V0 p( j- U
& `; }" X) ]8 {  Z1 V: S/ b) B
  set-default-shape turtles "car"
7 h1 l" p" l* B3 W4 V! x6 L, @3 n& `0 I8 k
  if (num-cars > count roads)
2 r8 I" M& O* b  [, y" Y" o2 \+ O% \
    user-message (word "There are too many cars for the amount of "% y; W$ S- g2 K7 q( z
                       "road.  Either increase the amount of roads "
- I3 @6 E, K0 K# u2 T. G; Y                       "by increasing the GRID-SIZE-X or ": x5 `) e9 X$ [: P5 @
                       "GRID-SIZE-Y sliders, or decrease the "$ O/ Z* a7 g6 K' M; P2 T3 U
                       "number of cars by lowering the NUMBER slider.\n": n' E- p1 t5 E8 C& j8 i7 b* z
                       "The setup has stopped.")( X2 J! k( d/ O& g2 J5 @3 F
    stop
$ Y) G  `0 N* C+ j, E9 v5 q* f  ]& }7 N/ U6 L9 e* N  Q

) m# ^1 P- S+ h3 u8 q+ k. P$ `5 B  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 ^9 Y4 e" {2 u- `- T! K2 h  crt num-cars4 H' f/ C' ]5 y' D6 H
  [  [% m$ P2 @5 `. T2 t
    setup-cars! i% y$ ?' V, n# q1 D+ D# D
    set-car-color$ s: h9 U$ |  x+ n& ]
    record-data
" U$ s5 O7 M/ \) f- C  ]3 ^9 T% \* H5 A9 G6 [& ?* g% ?& R. V- t

) [4 a& f' l- }! b  ;; give the turtles an initial speed
. b/ g' `3 j- P5 Z% C7 r% G' w+ M9 I  ask turtles [ set-car-speed ]: d8 T* @, l  s% Z6 Y
. Y; p- ?6 L0 g1 G, L7 c
  reset-ticks
+ A+ Y+ }) C, A5 Uend
# z1 W! \/ j* d) @$ }" O8 y4 t2 G9 }  n) d; i2 ~% j
;; Initialize the global variables to appropriate values0 P' [1 ~. x1 o0 O
to setup-globals$ [( v$ \6 `0 P8 X
  set current-light nobody ;; just for now, since there are no lights yet0 K+ Y# e0 D7 n* d" L; }1 f, l
  set phase 0. y, {/ \' X! }- a5 |: V
  set num-cars-stopped 0
3 p/ G2 t+ Y/ N9 l  set grid-x-inc world-width / grid-size-x
- C# l) N+ U& U9 i; z1 L! J* @  set grid-y-inc world-height / grid-size-y7 J3 `4 _+ F: w5 M' B: F

: Y: a$ b) i. M4 t4 A  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 w0 I) {% j, V* K1 @, @  set acceleration 0.0999 c6 f& a9 a: c: _3 k- I
end
3 w7 Y! m4 X& H0 Y
  ~0 S/ m$ j3 C* m8 Z' n5 E% J8 W;; Make the patches have appropriate colors, set up the roads and intersections agentsets,  V% d5 b: G9 |8 s
;; and initialize the traffic lights to one setting
7 o, `* J1 @3 K  @$ E" Rto setup-patches
1 d& k" G7 o0 [  ;; initialize the patch-owned variables and color the patches to a base-color, J2 i& t, W% k5 Z4 R
  ask patches2 x. J, @0 c9 A; S0 R
  [
  L% @; ?# i( v4 Q7 _( {    set intersection? false
, I/ |& r( q9 o, k' ~; L& U( {    set auto? false+ G- Y1 ], j6 T( `
    set green-light-up? true
) u6 m+ w$ |9 [0 N    set my-row -1( T# M( A" G& q) n) T
    set my-column -1
$ m. f4 l: B# |3 n' ~5 |2 F    set my-phase -14 k; h" l) _- u! m
    set pcolor brown + 3
/ A& w1 E3 z  s% l  ]" W5 R4 d3 b! Z

, H/ j( V9 B$ P: k& }" L+ P  ;; initialize the global variables that hold patch agentsets
  s4 C  c# R' a! T* O  set roads patches with: @: w4 P4 `& w2 H3 V  H* o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( b8 d+ G( T. _" K    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# w( U% l" J$ ]. n  set intersections roads with
: f) N/ Z3 R  K2 w    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ a  ^9 i2 }5 o, o& ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ P1 V# {( P2 c% c% o' p7 D$ `) R5 B, k) r( B( I: _. A
  ask roads [ set pcolor white ]% I6 r) e- C  h3 H) Q5 y* @* K
    setup-intersections8 D- q3 E2 r: U9 {- k8 {4 i7 V0 w& E
end- U3 X, ^4 S1 }6 H: y! F9 p+ w
其中定义道路的句子,如下所示,是什么意思啊?# Z0 V3 D5 V2 z8 Y& q  E: _$ Y
set roads patches with
2 L1 B" }# o5 F" K2 G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) ^  ]! j$ E+ b5 C# m5 y+ d    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 Y2 S/ T+ R( N! f6 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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