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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。
  d. t$ t. ]6 l* anetlogo自带的social science--traffic grid这一例子当中,2 I1 b! @( C1 o( W
globals
2 f0 E0 ?! |$ R) S0 \' O" B[
% Y: u% a, k+ b0 `  grid-x-inc               ;; the amount of patches in between two roads in the x direction
% m0 c: E  D4 m5 e' g  grid-y-inc               ;; the amount of patches in between two roads in the y direction! ^+ V6 V6 f2 ~0 {
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# m5 _0 \0 Q6 ], f$ ^
                           ;; it is to accelerate or decelerate$ ~! o3 ^( @! \  g3 ?4 r9 C+ t2 ^0 y
  phase                    ;; keeps track of the phase
4 E8 M9 m. m/ ?$ C3 {  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ R2 H5 x* X, B9 C" u  current-light            ;; the currently selected light. [* O( x  M$ Q, e$ M4 q, e0 x  M
2 w( Z6 G# s% F0 Z. V$ s
  ;; patch agentsets9 {8 @8 b$ q$ X, x2 O& m$ n& {* c
  intersections ;; agentset containing the patches that are intersections  H  Z+ @, z/ e
  roads         ;; agentset containing the patches that are roads
+ N2 m* g4 s  z+ W" G: v4 }]
, C& r# V2 _' V/ b8 W/ w0 Z4 A3 I2 F) [& k4 T
turtles-own; m' B' T# t4 T: ~' p: ~
[, p$ {( @5 P, z! C) E+ J
  speed     ;; the speed of the turtle
  Z, P3 W1 o. e7 N: y( a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right! X% J* J2 \( \
  wait-time ;; the amount of time since the last time a turtle has moved
4 [8 E$ f4 n# `( ?/ `/ f]  _; f6 G1 D- }; b! s
7 S4 }9 `( n( v' H9 t1 F+ w
patches-own
' {3 Z8 d8 V3 Y" y4 r[" ?* L+ `+ [' M. e; J
  intersection?   ;; true if the patch is at the intersection of two roads
/ h5 R* D$ B5 F' [) l  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 w: }/ Q" k- o' b& C: `# U                  ;; false for a non-intersection patches.( U! r, C' E8 {" s2 V' q" I
  my-row          ;; the row of the intersection counting from the upper left corner of the
' k- G7 x. B$ L& Z- b; A+ W2 o                  ;; world.  -1 for non-intersection patches.
7 Z2 w) Y6 G) a2 T, F! M  my-column       ;; the column of the intersection counting from the upper left corner of the. x' G- D: i) }
                  ;; world.  -1 for non-intersection patches.
+ f- Z8 E6 ?9 U  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# g( F/ b, X' s8 _$ }! t  auto?           ;; whether or not this intersection will switch automatically.; B" T# ]7 v9 g5 o7 @8 n8 ?0 F
                  ;; false for non-intersection patches.  V; y) k. B/ @
]0 m* ~" V+ \/ K6 E- e8 m; w

- ?1 C, g1 v9 q, ?. a( G
! f0 z: Y" w! J1 O1 b7 J+ _3 N) v6 U;;;;;;;;;;;;;;;;;;;;;;
/ g5 l) G- g% v" _0 X3 V2 P;; Setup Procedures ;;8 H% k/ W- T1 p8 t3 C7 [
;;;;;;;;;;;;;;;;;;;;;;
2 y/ n7 l7 x1 Z' {& h* _6 C# u8 I" _5 G, }( c2 ]  n
;; Initialize the display by giving the global and patch variables initial values.
+ m/ J4 U# J* G6 K8 R;; Create num-cars of turtles if there are enough road patches for one turtle to
! o6 y1 j% Z8 F5 W;; be created per road patch. Set up the plots.
* e! a* L- G. |7 q' G% q6 sto setup. P, e$ [1 N/ D6 e5 q6 z1 @7 U
  ca! b& q) q" C4 t& k3 Z
  setup-globals! v' C' d, |7 d% F1 e" ~& H

0 P) a6 ~4 i' p  ;; First we ask the patches to draw themselves and set up a few variables- I$ _. ], k$ w6 b
  setup-patches  I- w0 v0 G' r7 i
  make-current one-of intersections
! h  b) Q# @% Z% U( m5 {  label-current9 c0 i! P3 X3 l- e2 }

' D: d; o+ f% w0 O8 X  set-default-shape turtles "car"% P4 ]$ b# y, T3 H( v

' P5 [& c; }& u4 {. ?) e  H1 w  if (num-cars > count roads)) @3 ?6 i) |0 S$ Q. O! D( G
  [
; K2 N& j8 p- L2 e+ k    user-message (word "There are too many cars for the amount of "
) j# s2 |, G& C$ D                       "road.  Either increase the amount of roads ") R$ t7 A) D0 @6 W7 ~2 Z' b3 Z- ]
                       "by increasing the GRID-SIZE-X or "
! m" b' h- X: F, s" _. R3 F                       "GRID-SIZE-Y sliders, or decrease the "5 w. ^  q' z5 ?( W! F/ n% u7 C
                       "number of cars by lowering the NUMBER slider.\n"6 W& v. R3 H, o. x4 ~
                       "The setup has stopped.")
8 ^' o: F  L9 _, ^- @4 Z4 o    stop
3 f8 e, l/ `; l1 e8 d  ]- ?0 m1 I0 D- z- X# M

6 R0 [" r* C) a; V5 z  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 \* M- o" S' ]/ T# q: H
  crt num-cars  {; l% Z, n5 Z3 {
  [
, J/ _: f7 {  m: n    setup-cars
( _# }0 H+ _+ Q, t/ z1 i2 t  E    set-car-color
$ C# n; \9 q2 M  I4 o- d6 ]5 Q) Z    record-data& L: P+ ]- {' N7 V; J
  ]& N+ `9 U! U7 K1 U* Z

6 T% Y: V5 E5 L  ;; give the turtles an initial speed% ~: [! ^9 _4 [" b, {
  ask turtles [ set-car-speed ]( E2 d1 a' q: S- f

5 G# G$ V6 I) J/ I, ^0 X/ x  reset-ticks' Z5 A9 \8 Z/ @% O3 z
end
; k/ i7 e3 M8 c9 [
& x2 I5 D  c; i( ?2 L;; Initialize the global variables to appropriate values0 l- x! d0 T/ `4 O7 {9 X  D
to setup-globals4 @( M+ K) O' q& A& S
  set current-light nobody ;; just for now, since there are no lights yet8 I6 m; L. V5 C% }  ^' Z
  set phase 0
7 J% s, i2 J8 q+ C- T  set num-cars-stopped 0! j- x/ v& f1 j
  set grid-x-inc world-width / grid-size-x
+ A  J5 o- F+ V, a" b; g# g2 B6 W4 L  set grid-y-inc world-height / grid-size-y; x- T$ u$ F* {" W

( n+ S2 E; d  v1 e  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 F: _" t. _, D+ x  z8 Z" }
  set acceleration 0.099' m( N: ]0 H- m( l+ I% u4 v
end
2 ~, ?8 v; d# C8 K! w; A+ }) M* m9 q
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 x4 O7 f9 _! ~1 h& W5 ~5 u
;; and initialize the traffic lights to one setting: t, O( A. J$ s  i1 j# W( n
to setup-patches5 O; K( N* G6 H
  ;; initialize the patch-owned variables and color the patches to a base-color
( o8 z& |6 q. B6 x! \* B/ F5 @  ask patches
8 i  G: B6 m! T, {6 X6 z2 e- T  [  J9 P/ H, k( V! f; Z1 O* V
    set intersection? false  U* o1 N0 _- I5 a
    set auto? false0 S0 K. `; e; X* A
    set green-light-up? true" f9 Q, X7 j1 r
    set my-row -1% x4 ~, V9 Y+ k$ O8 }6 x* W  c& p7 S
    set my-column -1
3 H( s7 c' z; P8 J) o0 z0 d3 O1 r+ Z    set my-phase -1# M. {* @& z  d0 e  J' j
    set pcolor brown + 3
, W% G1 f, \. M) W# a  ]9 n3 \9 u3 E0 ]7 ~  Y. Q

; K. K4 n0 ~" i0 d5 U  ;; initialize the global variables that hold patch agentsets
. U7 E) m; _9 ^: h  set roads patches with. |6 h2 d3 Q, J" J# d9 o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& [! E4 Y1 |: G: x- o( m' N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 s% l; \: T2 Y0 ^
  set intersections roads with; u2 R6 v9 [9 j# G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& ?3 ]# J  W  c% c    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 D2 X. f0 l$ o! ]
! t. G: u! U2 m, I$ B9 V; Z3 `$ Z: T
  ask roads [ set pcolor white ]: o: H4 C# c; Z. v
    setup-intersections) W- ~5 [0 K& x2 [- R% `1 s
end+ N, j; Y% ~9 ~/ W/ e9 d3 T, [
其中定义道路的句子,如下所示,是什么意思啊?& Y, ]/ s: d; \- f" d! e) j
set roads patches with
1 [4 M  H0 D+ c0 h% r- b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& e2 Q+ {+ Q0 G# ~: U: x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( K1 B" ^; S" }* E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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