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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。
8 T- d5 n6 [/ P+ R+ mnetlogo自带的social science--traffic grid这一例子当中,
6 O6 H/ H3 ?9 e+ t  v( yglobals$ [9 J, R4 n) D3 K& @  w4 n
[
3 v9 D+ ~' A8 X: ?4 r  grid-x-inc               ;; the amount of patches in between two roads in the x direction
" R* @; }$ n9 A  grid-y-inc               ;; the amount of patches in between two roads in the y direction
, ?/ }! g4 w5 c" I# I8 u  acceleration             ;; the constant that controls how much a car speeds up or slows down by if8 |5 J# b5 \* T' Q# K* N+ r
                           ;; it is to accelerate or decelerate
6 B+ y' Z  t& W% P! y+ N1 z  phase                    ;; keeps track of the phase
! u' V' I8 X6 W  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  F# M  L' `9 ?* r2 o0 V3 O2 `2 q
  current-light            ;; the currently selected light
+ E) v* a3 u1 K( a3 C
5 t" p! t3 F, {, I4 R! s& Z+ \  ;; patch agentsets( _% o7 G. I  Q5 N1 R+ r! `
  intersections ;; agentset containing the patches that are intersections
) a6 V& y1 L/ z; [( q, q  roads         ;; agentset containing the patches that are roads4 m8 O$ L1 B' l6 L0 G
]. L7 ]. |/ t6 R; U  ]
4 H2 `& t2 _. e7 }4 |- G5 ~4 I
turtles-own6 V  L9 W8 ^! \3 N
[; S7 j# n! _  d5 i7 u$ u0 z9 C4 p
  speed     ;; the speed of the turtle6 Q+ c, u- j( J
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
6 J0 A8 y" U' A$ k, w/ Z( u  wait-time ;; the amount of time since the last time a turtle has moved7 p2 t2 d( y9 k1 c/ ?& Z
]
, p. [) d) S4 x: _4 b# V9 e1 R
9 a$ D( b% {8 I! Q) Hpatches-own
+ b  N- O0 @& L& s! ~[
& o- h/ @+ x, M2 o: S  intersection?   ;; true if the patch is at the intersection of two roads
( b/ [; Y, [! J) w4 o5 n  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# J% B4 }' b  Y4 A" N
                  ;; false for a non-intersection patches.
1 }$ {5 A: }; i( A% @) U' o5 x2 o  my-row          ;; the row of the intersection counting from the upper left corner of the
2 V- x% p/ F6 `) h9 m                  ;; world.  -1 for non-intersection patches.- S& h1 d( T" J, T- d9 f$ a
  my-column       ;; the column of the intersection counting from the upper left corner of the7 G8 F$ W4 k1 f; b  S
                  ;; world.  -1 for non-intersection patches.
) M/ x+ ~4 p/ X0 @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
) A- h+ W1 E/ d% z" u  auto?           ;; whether or not this intersection will switch automatically.# R2 r. w$ m  r
                  ;; false for non-intersection patches.
/ A& i! d5 y% X9 J4 c, Q: r]8 E" p; P# ^4 ~% `' r
' i6 Q/ a% J  c

$ b' M$ ~: m$ f3 C. ]: k;;;;;;;;;;;;;;;;;;;;;;
2 x7 y* }2 ~: i! B* L;; Setup Procedures ;;3 N5 I% `- }  y# {1 C! E2 v2 ~- u
;;;;;;;;;;;;;;;;;;;;;;
3 w  O! c" V1 m0 s. v/ x
- S/ L0 }9 r( g0 v1 e, v& Z;; Initialize the display by giving the global and patch variables initial values.
# w1 |& \6 m" N) H. u% Q;; Create num-cars of turtles if there are enough road patches for one turtle to
; p$ a1 }% O# l- @: @;; be created per road patch. Set up the plots.' L1 ^* u0 o" L/ \9 q# F. O
to setup* s* Z# _: H7 e: E# G" y
  ca
8 [: z) \! f/ ~% c) [) i0 T  setup-globals) _% d7 }) d$ C

- w/ \6 V3 t' i' S, p: G) B8 D  ;; First we ask the patches to draw themselves and set up a few variables
3 b% J& V. l6 F8 k: ~  setup-patches
6 M5 U, \: T6 |3 T) M2 O  make-current one-of intersections
- z. B2 o) V- g/ m. u  label-current2 A0 P7 b" O* l3 P) W: B
/ t/ w! c: D7 [- l
  set-default-shape turtles "car"6 |1 Z8 @) |, H* [5 b) Y2 ^

. }. E9 {7 [, Q$ q1 D  F  if (num-cars > count roads), P6 g5 i& g7 w2 m4 ]: P0 i
  [
7 {0 }+ y$ d0 B6 z  a( {: w3 S    user-message (word "There are too many cars for the amount of "
7 ]2 m6 ]! [) v                       "road.  Either increase the amount of roads "3 P; L3 i% J( j' s, M+ l
                       "by increasing the GRID-SIZE-X or "3 H: q# b- |0 t6 E1 H0 ^
                       "GRID-SIZE-Y sliders, or decrease the "6 b+ b8 T! L" G! _
                       "number of cars by lowering the NUMBER slider.\n"
0 c& l% O5 C  {8 w* F                       "The setup has stopped.")+ a2 a* X" m' u% Y: U( z8 V
    stop2 \& F& I+ I' Q9 M) Y
  ]$ T, l+ q! E/ z( d) T4 T

7 a; V# f# }) U8 H5 \. [  m# N  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% B! ^4 l9 g1 e% K- ^  crt num-cars
3 n3 v  E, f3 A8 n" a  [
4 m; A$ a# M1 K' _" n    setup-cars
1 |/ H$ l# }4 p% [3 ?+ S- \    set-car-color
, x7 v5 J) B8 q  M7 }    record-data/ H* f! j' W" {% S" |3 l
  ]$ z0 [& D% k1 ?( X  E' g
4 y2 l% E! e' k1 N) b
  ;; give the turtles an initial speed
& A7 j7 l; }- s4 b( g' r" R  ask turtles [ set-car-speed ]" n. K6 W$ V. A) b
. Q  I3 K3 C4 M; B2 }3 ^
  reset-ticks) R5 b2 [( R' p; z, G2 Q
end
4 v" h7 H- U* h+ i+ H. u# v+ M# R0 U/ Q
;; Initialize the global variables to appropriate values, V; Y' i/ @+ G1 N5 I: j& l/ H& e
to setup-globals& U2 f+ |0 h$ [0 Y
  set current-light nobody ;; just for now, since there are no lights yet
( u2 g/ F8 \: S; F1 E0 y  set phase 0
: J. m5 z. f3 u  @  set num-cars-stopped 0
& o5 q4 |! k6 ^2 @( V& m  E9 f  set grid-x-inc world-width / grid-size-x( j. e2 r6 m/ H: {1 @* ~" O
  set grid-y-inc world-height / grid-size-y$ N: O" i5 z$ R+ J# k8 \/ y
: \5 a! t- e' q6 Y- c$ h
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) b/ H7 ~* u* C! p$ l$ y9 }% z  set acceleration 0.099
2 X  {: W& x3 e; c9 V6 Z1 gend
* }5 g2 F) D- F1 f: `5 s, Q1 w- P: u+ Z8 Z- d
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 k: E1 l8 R/ H5 z;; and initialize the traffic lights to one setting
$ {* X: y% `- N- k! qto setup-patches
5 K( P7 c! g- Y. H$ m0 u2 [* |  ;; initialize the patch-owned variables and color the patches to a base-color
( j2 Y: y# W9 G9 k: T; s# M8 t% {  ask patches( [: l3 {% y) N1 M$ d
  [
7 f) E; Y+ x0 p. f& e! w    set intersection? false
; M) E9 m/ Z5 j    set auto? false
* d) {+ s: d3 z2 A    set green-light-up? true
1 R5 H& N- Y5 I0 m    set my-row -1% R4 O# v" i* P: m0 M1 u
    set my-column -14 V% V$ i8 w1 Z
    set my-phase -1
& O( _8 G' D- Y$ q$ S/ Q    set pcolor brown + 3: Y2 b* w9 D4 J$ P6 I
  ]
* R2 h/ _" m, O+ b+ ?
3 H8 h+ v! h3 G, T: E  ;; initialize the global variables that hold patch agentsets
# `+ \2 X, w3 E* X+ u  set roads patches with3 s: w. y* F% _! X2 I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- [/ M) I: G- k% X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 O- C, H! e% n8 ?
  set intersections roads with
: C, \2 }  W& z' |6 G' r  A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! V$ s; g4 r2 z( H4 A/ b. ^& y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' y& E; X$ m1 y, `+ P8 Y

% L1 }) k$ n" W, w  ask roads [ set pcolor white ]. ?1 v1 a% Y; H8 u; B' c! \3 m
    setup-intersections2 \4 a9 x* g$ j: v+ w
end
8 O, a! {/ y% \! X" [其中定义道路的句子,如下所示,是什么意思啊?
" E7 `# q( [+ @7 d0 _- Y, n- }2 G+ e set roads patches with
1 g* v" r/ w- B; o$ ]    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* ?+ j3 ?1 e) e3 M, k9 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% w& R  c* y0 u, u2 b* C) |$ f; v
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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