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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。
& k8 }$ u! d" }1 wnetlogo自带的social science--traffic grid这一例子当中,
$ ~: V/ ?1 g" ?& r* {) U+ \  qglobals
3 G5 T( k& {# C) }$ [) }/ [[" |, S8 n1 {2 g& _1 r+ m
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
+ X8 D0 o) r4 X! N  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# }: D' ~' M' p7 m" V  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
* m' J" v  y9 J* u                           ;; it is to accelerate or decelerate+ N' w8 O' t2 D1 x
  phase                    ;; keeps track of the phase
, \: b5 L  P3 T+ A: c. k4 m  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 c) E2 E6 o% J/ ?5 _7 q  current-light            ;; the currently selected light
) o; j* V& U. E7 ^
! F4 r& a  _3 c, ^- F; S  ;; patch agentsets
+ Z$ b* S7 b& O  intersections ;; agentset containing the patches that are intersections8 d: t1 z% F0 I7 _4 W! n- ~8 J
  roads         ;; agentset containing the patches that are roads/ h8 G! p5 n" w4 C0 ~5 d/ O, \7 U
]/ {" P) O% F( r$ L. |( ~

8 u8 q7 O& O5 F' A% h6 yturtles-own0 n% X+ p8 R' `- j" D% Y! O
[
& H' X; J5 @/ x2 p3 x* T  speed     ;; the speed of the turtle' i6 G: N, u& J0 P' g, |
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
4 i4 a2 s1 y' J7 H8 f: g  wait-time ;; the amount of time since the last time a turtle has moved
6 j% t7 ?5 B) \5 F7 E+ \]
" U+ X4 `! N+ h) J3 v3 L. h9 r- o6 h/ l# M1 |
patches-own7 ?/ s, ]3 l/ I* X
[
5 t! X" z1 e& }! h7 w: \  intersection?   ;; true if the patch is at the intersection of two roads
7 w8 T' t% J" o  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.4 m: p3 T0 L: B. M; O, N+ D
                  ;; false for a non-intersection patches.
+ o6 K6 O) l2 \. c4 L6 I  my-row          ;; the row of the intersection counting from the upper left corner of the
' E7 G6 [8 d. `                  ;; world.  -1 for non-intersection patches.
9 q: b* s! }0 K3 v) \8 w) y  my-column       ;; the column of the intersection counting from the upper left corner of the0 b  f* B: \# J0 M
                  ;; world.  -1 for non-intersection patches.
  T8 K/ C# {  G5 h, y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 X/ U% t. |$ L2 d1 ?9 J
  auto?           ;; whether or not this intersection will switch automatically./ P8 [% w0 q3 S  I2 z( z% r/ t2 b
                  ;; false for non-intersection patches.5 n' \# b3 A& S+ F$ A5 c+ {
], O- ?: M' h- n3 b

* O, ~, l: q" _- b# F) m0 ~8 `' ~; P* ^# L
;;;;;;;;;;;;;;;;;;;;;;- i. a, c, \5 t! B/ j
;; Setup Procedures ;;
/ b+ N  S6 Z, p3 M;;;;;;;;;;;;;;;;;;;;;;
% @/ m1 }' ]% t( o6 G% p
: E7 Q( ?4 b& c  O+ u% e;; Initialize the display by giving the global and patch variables initial values.
# b) h0 o( Q$ d6 J. T4 E;; Create num-cars of turtles if there are enough road patches for one turtle to7 N2 U$ j; l* c# w
;; be created per road patch. Set up the plots.$ Y, }; f: b( x  s9 H, H
to setup8 u1 @- g$ C9 Q* S( u; s+ E( w
  ca
0 s' x/ D# d% Q! h  setup-globals( _! K  i0 ^5 u. d

6 s* e+ Q8 \, R9 U2 Y4 H  ;; First we ask the patches to draw themselves and set up a few variables- H$ ~9 x0 R0 B5 Q  u
  setup-patches! ^0 C% _9 {7 I% {% r6 e1 |2 I
  make-current one-of intersections
4 w/ f$ ~) x/ [4 E' Z+ U% T  label-current
6 L: J1 h. Q! G- k8 N% q' Q* B- A, w2 D+ ], V
  set-default-shape turtles "car"
5 }) d% s! n/ i+ K* l! ~0 n* D9 k) A
  if (num-cars > count roads)
) _4 l. ]; J/ ~3 D# q* j  [
* B4 G- z! Y9 Y5 e( c4 b% V( n    user-message (word "There are too many cars for the amount of ". `# ^, H5 G3 M# v2 H. B
                       "road.  Either increase the amount of roads "+ p; ^; b4 r7 r, t
                       "by increasing the GRID-SIZE-X or "
3 B1 q9 T4 Q4 `                       "GRID-SIZE-Y sliders, or decrease the "
7 Q4 v/ _5 q8 u                       "number of cars by lowering the NUMBER slider.\n"! m1 }* L7 l$ k# ^
                       "The setup has stopped.")/ g* s" M( P/ O  K$ Y
    stop
, x  Y' l+ a2 N$ k$ x6 [  ]
" C  t) p$ m+ U/ {/ V$ H( e" G0 V% T8 D
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 `6 Q( @! |" B( i2 J7 P0 _  crt num-cars
! u: r4 D6 }* M" l' _" D  [) X' b; P) L- l  t* P+ b+ b
    setup-cars
  u: o+ d: H! }    set-car-color
2 X9 ?& J2 A- G5 R) Q: H6 r    record-data4 ]/ P# V9 K8 l# q9 n1 E
  ]
6 Z3 s" w% a3 y* U- D: ]4 N! \9 S. p8 ?- ~! [7 [+ S/ Y
  ;; give the turtles an initial speed$ D8 D" i! m7 B7 R% @
  ask turtles [ set-car-speed ]" m2 @  P  M0 T+ O6 C0 Y# F, h
6 U) o) q' Q0 ~. v( E. C9 ?$ c2 K
  reset-ticks0 \: g- B$ B+ [/ b, {5 b
end
* I# R. B. K* ?) F% Z  c8 ~9 n# @# j$ j0 r
;; Initialize the global variables to appropriate values1 Z2 v3 _$ P/ l$ H$ F
to setup-globals
' K/ L8 s1 ^4 I# x& T0 u  set current-light nobody ;; just for now, since there are no lights yet
& X) u, ?+ T' n4 q  V. }0 q  set phase 0
( Q3 }, A6 q8 E" m3 Y  set num-cars-stopped 0
+ l. V$ N% M9 o& I2 P  set grid-x-inc world-width / grid-size-x% J/ S6 ~4 E- d' Y7 P
  set grid-y-inc world-height / grid-size-y6 d& T7 F4 Y; n9 i: |4 f6 v* v
, O* I$ R' S0 L% _: o
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. E- j0 H# L, z" a2 I6 i  k4 b
  set acceleration 0.099: b5 o& s. I% l/ @5 c* o
end
6 M8 ?4 i  |+ s. n* {7 ?+ P4 {7 A( G4 T7 X
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 U  ^% K/ t8 g; j: G
;; and initialize the traffic lights to one setting
9 A  f3 S" \: E6 Vto setup-patches
3 H9 f$ x! D) m( o1 _- K  ;; initialize the patch-owned variables and color the patches to a base-color
4 y8 ?" t' |: _) r$ \4 B  ask patches
# L: B( g/ E; g2 J  [  ]' ^, y$ N9 w! \- h( t; Q1 T! a
    set intersection? false/ e6 o6 N2 E  o" [* b* c3 k
    set auto? false- J# Y+ T$ f) W) |+ m
    set green-light-up? true
& y$ _  z8 ?* A8 W* T    set my-row -1% J  a6 u; p1 k& E' H+ Z/ Z
    set my-column -1
% B# Y* a! E, D5 z( ^    set my-phase -1% u$ D, o  s" Z# g' t- H0 R
    set pcolor brown + 3
- }2 @9 W) |- N, Q7 @  ]
& @/ j  h0 a4 `+ {
, ?, O0 H9 M% x! E  R  ;; initialize the global variables that hold patch agentsets9 D$ u4 N. }7 v* X5 s. T$ w
  set roads patches with( z5 V2 g) Q8 R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 k& B1 H0 A6 P3 L/ f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, L4 J+ {+ f  F7 Q3 s# x  set intersections roads with* G: b+ o9 N5 k* K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" \9 X: {* A9 U; K' L- _
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 ^) H+ `1 C  u9 v6 d4 q5 h4 g$ h- ~* D" y/ N# x) E* d8 v$ G$ s, I; @, B
  ask roads [ set pcolor white ]
/ a) U, Q; q" e; s0 y* f' u- c    setup-intersections5 `" _0 ^1 c* W8 Z& F
end: H2 d# h  I% R% C5 n8 E3 `
其中定义道路的句子,如下所示,是什么意思啊?$ y' I/ c( J. F* g9 v0 ^* m
set roads patches with- L* j8 x, t3 e9 [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 Y) R5 F% q7 Z9 p/ x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 W1 W/ \9 D8 L/ `
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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