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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 N2 \( X4 c0 B- L5 Hnetlogo自带的social science--traffic grid这一例子当中,
6 N1 C3 ]) v2 H% L" gglobals6 ^+ ^% w7 a" y. e
[* X% @% o1 l& ^1 p! O6 b
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 s& ^  |8 ~6 B0 s* _, ^3 z  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 T9 S& L4 J: U' v% W  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% B1 Z. n- d( S' o5 l0 r$ A# G+ e                           ;; it is to accelerate or decelerate/ Z- i9 z  k, |8 X" a2 C; T+ \6 C+ y
  phase                    ;; keeps track of the phase2 I' V" C. b; v; y% t$ p9 p
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 C; h: l+ _9 P3 L- d3 K. z: r  current-light            ;; the currently selected light
8 O! t: u. B" M, H9 O: b) @, W) ^& G
  ;; patch agentsets% Y- m5 I  G& F9 t. R+ k  T
  intersections ;; agentset containing the patches that are intersections
8 E/ e9 t. o% X  x  m  roads         ;; agentset containing the patches that are roads
; L% v8 F8 y  D5 o9 y]
( l1 d' E  L# n6 c; Y
& l! X0 m) a' a8 A) U* \! o% D1 }( Dturtles-own3 k0 \$ m) [7 |
[
/ T/ S! @5 [% `1 s  speed     ;; the speed of the turtle
7 Q: K7 p4 o* M( a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: i2 G+ N2 I% G6 g/ {/ S2 p( ^
  wait-time ;; the amount of time since the last time a turtle has moved
" F7 j- c" m. c+ r4 P0 G]
' L# Z( P& e+ |0 Z" `! Y& q% E
: m) D) j5 e1 bpatches-own, f& `4 s: q: Q! V, X1 ?7 S8 ]
[7 Y! ~1 Z2 \- k6 o
  intersection?   ;; true if the patch is at the intersection of two roads
4 E9 ^8 ~3 b3 x0 S/ L2 c% _  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 y9 Y% t$ f" q% c, `2 {. Z+ n7 c8 O                  ;; false for a non-intersection patches.9 o1 x2 ^. P2 e5 T! d
  my-row          ;; the row of the intersection counting from the upper left corner of the
' O( O0 A4 H* q/ Z                  ;; world.  -1 for non-intersection patches.
, p% `$ _3 v4 e6 W" w  my-column       ;; the column of the intersection counting from the upper left corner of the
. E3 }3 G3 l% V* J7 S+ ~                  ;; world.  -1 for non-intersection patches.
# g8 O, _, P6 y& }  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ n* `' U5 X7 d, R. z
  auto?           ;; whether or not this intersection will switch automatically.. u! ^# Y3 E) h( Z$ N* I
                  ;; false for non-intersection patches.
8 t2 |7 z  O, g6 X]
+ U5 f( P9 s! J7 r' v& p% Y0 c/ V

0 F' v5 i) z3 e% V! X2 {+ Q/ P;;;;;;;;;;;;;;;;;;;;;;* o% ]2 J3 c4 B+ _
;; Setup Procedures ;;
- B. ?+ }- z5 L3 z" a;;;;;;;;;;;;;;;;;;;;;;  z1 \" U/ t) Z2 a
) f" M2 t/ r0 P  `& i
;; Initialize the display by giving the global and patch variables initial values.. ^. ~" K8 k4 |9 j# @
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 R8 y/ d% p6 G3 C;; be created per road patch. Set up the plots.
. k$ n' c" ?) G* p! \, Z- S) tto setup
! W6 p+ \5 K2 f' x5 m$ J: h% H8 _  ca! z) v7 x+ I! I9 D4 w
  setup-globals
* X1 ~3 G3 m+ M. J7 m" W$ Q+ T, O7 |1 u  M' h
  ;; First we ask the patches to draw themselves and set up a few variables6 V+ T+ L# n1 V* u& [) J
  setup-patches% U) e3 |5 A- J$ [0 ?
  make-current one-of intersections
$ C! i' ]( b" R  label-current) @. Y! R# e. r9 M& A

! Y, G1 i3 z* _8 q0 S  set-default-shape turtles "car"8 U) \1 r; B  N1 I0 k2 ^# u4 A  [
0 o+ y) |% R" N% S+ u
  if (num-cars > count roads)7 w; v$ {' {! O' [: h# d% t/ W
  [
' T, H; Y) |5 c+ B$ [. z    user-message (word "There are too many cars for the amount of "
, x2 E5 b8 H' R, _                       "road.  Either increase the amount of roads "
6 S& ?; R7 d, d# \, M                       "by increasing the GRID-SIZE-X or "
/ @: f* n( [' g% c' f                       "GRID-SIZE-Y sliders, or decrease the ". T8 v* k$ n. x9 h* ?
                       "number of cars by lowering the NUMBER slider.\n"' p  |9 X& a" u8 e% _, J# q
                       "The setup has stopped."). H8 ?6 @% w  `# @: N' E7 O
    stop
7 P* L  n8 {* H  ], a/ L! U$ k) p. g. |
* w) d: r/ n: Z% W+ l, K  r3 r. K
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ w# |. S! S; ~" T  crt num-cars
" M/ `& U! X: W5 F0 s# e  N; ?8 b+ B  [  f6 ?! A9 b9 H" w  C5 _4 N
    setup-cars) q7 P7 [. @+ J+ @; m7 z! d  q
    set-car-color
2 {. T" k: M( f    record-data: r4 d  ~1 Y1 _; j: V
  ], I7 @( M. E. L
( L; H4 _+ Y( ?. u7 v4 R
  ;; give the turtles an initial speed+ M0 u5 t+ z/ z! P1 W4 U
  ask turtles [ set-car-speed ]8 \; U0 i. W( ^9 o" i+ E( N

/ N4 X* T2 l9 R) K) Q  reset-ticks
: Q% q6 @; ?- ~+ U/ _! fend2 C, |& A$ y" F9 E+ w+ X" ~

- J: A5 L. f- g9 |0 u5 r. ?9 @;; Initialize the global variables to appropriate values* U0 |6 I2 V2 V+ C3 U# U( F/ H3 a' k6 [
to setup-globals6 c# j9 r6 F9 x; u/ m+ A0 A$ f
  set current-light nobody ;; just for now, since there are no lights yet. }" O; A% r5 }5 f* V/ i
  set phase 0
  t. b/ A# X! |5 `+ X7 E* a1 P  set num-cars-stopped 0
% o* j0 Q6 h" M. W9 j, z  set grid-x-inc world-width / grid-size-x4 `3 M& S  U/ L4 P& g1 @# _
  set grid-y-inc world-height / grid-size-y
( q/ o# M3 R- H- s& w# f* l
; q: ?$ U& ]' h0 h  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ |! [) p  t9 C& l/ a9 n! ^( k  set acceleration 0.0999 ^7 v# c( R" D- S! y+ ]
end
2 _% y2 E5 N" t  K/ J5 o5 V5 [7 d- x) x( R# a9 ]8 m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 ?' `1 u. G: P2 |& G, m& M  A) {
;; and initialize the traffic lights to one setting
6 o( u/ e1 ]; f! Bto setup-patches
% C1 U3 s( `7 z" l+ x3 C4 u  ;; initialize the patch-owned variables and color the patches to a base-color& K" w! X% P; G; p3 m* M9 g
  ask patches0 I0 n  T9 Z% y- X0 L3 o/ u
  [
% l) s+ y- Q5 v- B1 ]5 V, E! w& x! w    set intersection? false: g- ?! f5 N3 h' m( t+ G8 Q- y# G/ r- L
    set auto? false
& N) X  A( N* q    set green-light-up? true: f* W' X# h& J
    set my-row -16 x$ ~; V1 K' T  E# R3 I
    set my-column -1
9 r* u8 T: W/ @# e) c% a    set my-phase -1, g- J0 ]: [# C' O3 M# M- }
    set pcolor brown + 3
# {( D/ q) S& w  ]
" z: O' `- i" L# ]+ @) d5 {, N  s9 e9 r) M! r, E
  ;; initialize the global variables that hold patch agentsets3 j+ {/ h2 v4 v. X2 b% ]8 J
  set roads patches with
: k; V' g' ]. i7 u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- N1 Y: `* c9 l) D' K5 V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, Q2 H* K& Q# t6 |  set intersections roads with
: W& p6 ^6 n. K. K4 ^0 r! G# ~    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 W" d# x2 L4 n; h; |+ w' M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ x# v2 k+ s1 H

- x0 }" u+ r6 r$ O. l7 W  ask roads [ set pcolor white ]+ K1 i5 @" a) @0 e- E
    setup-intersections& G3 q4 w! R, N0 P# |/ K. k* F  y
end
+ c# Z( m/ z8 V( C其中定义道路的句子,如下所示,是什么意思啊?+ p% j5 O9 ]- |7 o
set roads patches with# _, A, a1 f  C" Q: [. B' j; S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- N3 a, F9 y' t$ q, l' F
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 b! P) o5 i5 p6 M; ]/ r- Q, C! }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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