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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 n6 U( U6 p) r/ H/ Unetlogo自带的social science--traffic grid这一例子当中,& y9 _" b, R- o6 h
globals
( D  P( ]4 N9 P/ C7 Q[. O0 X  B0 m' G" y! q
  grid-x-inc               ;; the amount of patches in between two roads in the x direction% Z" {/ e) N/ M. h$ N5 U* x
  grid-y-inc               ;; the amount of patches in between two roads in the y direction9 \' z  h! y* P
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
2 d. I3 j9 o# D3 S0 C# l                           ;; it is to accelerate or decelerate
; V' C; q: ?- E0 s3 h  phase                    ;; keeps track of the phase
6 v! n, e1 q9 T  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure# {+ p5 S& }( O" O3 W: P
  current-light            ;; the currently selected light% {1 J3 B4 k& H3 r0 h( U0 ]0 E
) x$ i) f: \8 b1 }4 [+ S3 t
  ;; patch agentsets
" t3 J7 o8 @/ o9 J  x8 V  intersections ;; agentset containing the patches that are intersections
% g9 U! E" A4 F  h3 L; h  roads         ;; agentset containing the patches that are roads
' f+ k, d  U& X' a]
( {% z! k( m$ V6 b9 ^. D5 ?' f' A0 r# n* R
turtles-own
  J0 h. F# l  ?0 j1 {[
, c$ ^+ T" A2 ~+ y+ f# I  speed     ;; the speed of the turtle! |! G+ T( ?* h/ [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
# _0 ?' n0 |1 x- G" q  wait-time ;; the amount of time since the last time a turtle has moved
" @: x$ u3 M! w, |6 A]
6 G  Q6 V3 g" N( _7 w: }- X- d$ x0 ~0 q
patches-own
) ~1 u5 R5 i& p/ u" h' M[
5 h* n: k' b; }' S% ^* ^  intersection?   ;; true if the patch is at the intersection of two roads) N4 P) ?) h+ I- ?
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.1 j, O2 Q, |; f" Y( o' B
                  ;; false for a non-intersection patches.
; L3 }9 l5 ?4 N! f' j" [+ J  my-row          ;; the row of the intersection counting from the upper left corner of the' c, `# V* f, d( j" Q" v2 @7 G
                  ;; world.  -1 for non-intersection patches.
8 Q$ r8 U" D- H) _$ q/ B$ D0 \8 m  my-column       ;; the column of the intersection counting from the upper left corner of the
1 y) l- {) {( }' U$ R                  ;; world.  -1 for non-intersection patches.5 e% B) ?& Y9 |1 }6 |( L  W6 g6 U1 X
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& d2 c  Q( O7 {+ p% j  auto?           ;; whether or not this intersection will switch automatically.: }' [: ?( @0 r2 k- y% u$ b
                  ;; false for non-intersection patches.
& G6 C- u+ Z3 N2 i5 @0 g: w]
4 j3 A0 ]/ }% d1 O  E" }, L) Q# T" o" c; u1 m3 Y% o

2 f/ a9 c: g- n. }$ S9 C4 X& [;;;;;;;;;;;;;;;;;;;;;;
) q/ \5 _  f: H. u# L' o;; Setup Procedures ;;' }( N% b9 i5 X: \5 K* Z; f
;;;;;;;;;;;;;;;;;;;;;;
) `. }, P- e, D' ~0 f
6 }4 @: d- w8 u3 ]( S% W- y;; Initialize the display by giving the global and patch variables initial values.1 ~' [( k' R, ?* q5 D
;; Create num-cars of turtles if there are enough road patches for one turtle to
6 S* X" ]$ Z! [) l;; be created per road patch. Set up the plots.! t" P& F+ \7 H/ b# L9 x' U
to setup
6 j0 \! {& {! @: D  ca/ B6 G0 {( @, a- b) d( V- N
  setup-globals
: F- M4 k. v. U5 w
: B* `. _; l% N6 i/ r8 o: ?' I; m  ;; First we ask the patches to draw themselves and set up a few variables
5 e0 ~8 [/ ~6 B* \  y) u  setup-patches; e( p" D0 u' e, ~& ^" b
  make-current one-of intersections
2 ?! l8 R* j- b' p  label-current
; q" ?5 V: U7 L8 |. }6 d8 Y2 \5 T% b( N& q
  set-default-shape turtles "car"$ R5 A# J# k- Z% K: N& b( d

) C: e$ l; F0 C/ f  if (num-cars > count roads)- |; g0 R9 u# w7 y1 y
  [" |1 G. `5 e, H9 O% }) k* H" K
    user-message (word "There are too many cars for the amount of "
% y& x  `; Z1 h7 H8 d0 E& x( E                       "road.  Either increase the amount of roads "5 F+ z: b4 \; c) M
                       "by increasing the GRID-SIZE-X or "
5 _" i/ i# W4 ~: F; D                       "GRID-SIZE-Y sliders, or decrease the "! ?  H5 T" X4 |) K1 G
                       "number of cars by lowering the NUMBER slider.\n"
9 I' |! q( u9 [! {* t                       "The setup has stopped.")
. J- d- N) K2 d( W7 H5 v    stop
2 O! j8 w6 s. P5 A" o" f  ]# B$ D7 W5 ?% J% u

* R( c' P# j$ h& a4 ~' o& k  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; J/ L. ]3 M+ \( f  H- _  crt num-cars% u5 _! f7 S) y9 J% i
  [; y. \. _& i$ ^
    setup-cars1 |3 K8 P8 r. X# m8 O& B  p: Q
    set-car-color
/ r  E/ U. z! [    record-data) f" d3 b, O  o4 S8 b+ z
  ]% d" Q+ ~  r9 {! |) U4 U

6 b) ]7 `( m/ n7 N8 z  ;; give the turtles an initial speed  q" o, I6 c- U; s2 e; ^
  ask turtles [ set-car-speed ]' R; _* I. `5 f) j+ f8 B8 |

2 V& Q. t5 m6 L+ o6 p. A  reset-ticks7 a. P( q6 _" m9 Y  T
end  x% m+ c0 Q/ @1 ^4 o1 H1 N

9 U) V/ L: J  `( S3 ~" F3 [;; Initialize the global variables to appropriate values& X3 r% Z4 j0 N9 d
to setup-globals
5 i4 _( S  b9 N; y$ x( L% j9 b' B  set current-light nobody ;; just for now, since there are no lights yet
. y) P) L2 `( `! K* r4 Z, M8 T- }/ G  set phase 0
8 V8 \1 {/ V5 {  set num-cars-stopped 0
& p) p" n- _- L  set grid-x-inc world-width / grid-size-x
" h/ L7 E2 p5 i( b  set grid-y-inc world-height / grid-size-y
1 z& G' R  l& Z# T' z1 |+ N9 E# V7 ?
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary  j  s6 B! t5 J9 l/ U5 S' [- H
  set acceleration 0.099' E- C- Y6 f$ D
end
) f5 e- U2 s) {" l" w5 ~6 \% ]$ c  t" f. a! `3 u" S* @* `
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' e* I5 a$ z. c% V* g2 }4 s
;; and initialize the traffic lights to one setting
( N( q  F' ], H+ _" t, I3 P' Kto setup-patches5 J9 H8 x9 V; G5 T5 r3 V
  ;; initialize the patch-owned variables and color the patches to a base-color, o( o1 m: I) m  n/ H
  ask patches7 x0 j" t* f& D/ W) r
  [
9 X$ {* Z/ m2 }: c7 n1 S' {    set intersection? false1 s' x3 I( R1 m& J
    set auto? false4 o5 D7 c+ j  B5 @6 }1 d
    set green-light-up? true# v3 u, Y1 k2 A* ~9 o  \
    set my-row -1
" W1 V2 o' Q9 {9 o/ S    set my-column -1
2 V7 P  c: K; M- u5 E% d, O    set my-phase -1
% l' \: O# f* y/ I" m, V/ G    set pcolor brown + 3$ o8 Y% ~% w4 b8 I+ y, i9 n
  ]
6 H' Q7 |, C0 A8 n# X4 Z
- \9 |9 w5 b  Q- ^  ;; initialize the global variables that hold patch agentsets; v9 l$ X$ V6 `* E' j8 Y2 ]: k$ H
  set roads patches with* V" p9 I( r  ~2 |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' j$ Q8 b7 t% D; r# r* V6 C9 y/ x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 w* O$ {! W) |+ A2 \1 k, r
  set intersections roads with# f" u. C$ b" V* U! }! A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
8 M2 [, l: d1 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 j( @/ N2 I) N: B  t3 A5 [

* C7 x+ A4 C8 I* u9 l  C  ask roads [ set pcolor white ]8 g! f# z2 U. k- j* s7 N% e' d- X5 i# I
    setup-intersections% N, j% P2 q5 [. }+ M
end
* d0 W! ^4 Q* g7 X5 B/ Q8 ]( w/ }% H其中定义道路的句子,如下所示,是什么意思啊?
- `  d4 Z& c/ N' C2 U set roads patches with
* b* F) ?* p9 a/ M' d3 ?! U/ \8 `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& f+ D, _7 k2 x. N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 V  t. A4 c3 j0 G/ I1 u7 [
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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