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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。
4 t: ^* c. }% Y% w7 pnetlogo自带的social science--traffic grid这一例子当中,
( E, A( G0 f6 v0 j  Pglobals, S# l3 |4 F/ @9 x4 W
[6 P% ?0 w. i, I, A$ v
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
, y5 V8 ^. `5 Z3 s7 P3 a  grid-y-inc               ;; the amount of patches in between two roads in the y direction
% g: X: {0 R3 d3 V4 Y6 |5 F! K  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# h/ Z, {8 ?; h  G0 [. `                           ;; it is to accelerate or decelerate
' s0 l' P# o0 d6 E( \" N  phase                    ;; keeps track of the phase& t  C& S( R& `4 n
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& n- R: b; ?$ l" Y8 O- ^) O) `
  current-light            ;; the currently selected light
3 s$ u' G$ d; x% F' b7 {% N4 h5 M" s: O& \8 k
  ;; patch agentsets
8 g: m- J4 G: h3 L+ c; u) u5 E9 N; E5 Y  intersections ;; agentset containing the patches that are intersections/ h- a7 K3 b! E, ^2 b5 [4 q
  roads         ;; agentset containing the patches that are roads
/ V+ x8 c* _  S. |]
& U( J/ D: z  ~. L, b6 {
/ F+ Q% _- w1 f! L$ ^3 I+ Iturtles-own: \1 a2 L0 ?# z. j) J
[& S. B2 ~& z" Y7 u# t0 R
  speed     ;; the speed of the turtle1 |# i1 ?9 }% N7 S/ ~  b$ d
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right; L9 D5 |2 A8 J6 \# I4 j% Z8 J; S. E
  wait-time ;; the amount of time since the last time a turtle has moved
' w0 [' f+ t6 i$ Y]5 x  G" C( Q1 L
4 F: {5 @! V8 Z2 Y
patches-own. m& N7 h! a2 h- k3 f' R1 _! {
[
, G( o$ H* w1 j  intersection?   ;; true if the patch is at the intersection of two roads
3 ?0 l: S1 d( R! T$ M  U  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% _) D2 u2 ]( \6 d                  ;; false for a non-intersection patches./ U8 T( U* p. [, r3 P' x  _+ m
  my-row          ;; the row of the intersection counting from the upper left corner of the$ b: \% L9 |( |' Z
                  ;; world.  -1 for non-intersection patches.
( j5 k+ u9 Q$ r! W, z  my-column       ;; the column of the intersection counting from the upper left corner of the, w7 i4 R. z$ z( @% O$ L
                  ;; world.  -1 for non-intersection patches.
, a/ ^. p% T! @/ b  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.0 P% O3 r* b" p6 _7 X
  auto?           ;; whether or not this intersection will switch automatically.: v/ B" Q* |+ @  y4 {* c& [. s/ k; @
                  ;; false for non-intersection patches.2 J  E9 ~1 d/ ]% u' f( }9 r/ L" t
]
/ c. y! C" H- G' A% _% M" K( h7 B- K/ C

4 y- B: b' Y9 O2 n$ E# |& H;;;;;;;;;;;;;;;;;;;;;;0 I, \  x! `0 r9 ^4 N
;; Setup Procedures ;;
, ~* h& ~( k6 X" B) a7 _4 Q;;;;;;;;;;;;;;;;;;;;;;
% K4 E. ~: w7 v% z0 N+ N6 ~2 _" S. X' j- o
;; Initialize the display by giving the global and patch variables initial values.
: F, ~8 Y' O0 |- C;; Create num-cars of turtles if there are enough road patches for one turtle to
3 [/ ?9 j/ A& w8 _: E;; be created per road patch. Set up the plots.
* l+ b9 P4 `7 S4 y! E: s/ Vto setup
6 _" V* L, B# i" r8 ~  ca% }. u/ z6 U2 E; s5 {
  setup-globals6 r' y* j# e: Y9 T$ j3 S. T# q2 ~

3 J4 g& R. F8 G, c; R  ;; First we ask the patches to draw themselves and set up a few variables2 C5 ]- Q2 l2 `; }: L
  setup-patches& {- B" Q' r$ v+ m0 h" R3 _' p
  make-current one-of intersections
& ~$ G1 V3 j4 Y! h, ^) V  w  label-current
* d4 z5 k5 D5 \1 e( b; r- u
- w% \5 C8 O1 }" W! R" ^  set-default-shape turtles "car"
- G% X# ]" p2 A0 u" @. m- g* d# z1 N3 b: a( h
  if (num-cars > count roads)% ~$ i, y+ d4 a' j, H# U4 D
  [
0 |! ~) v6 x9 _5 Z8 U" a7 a6 @( {6 Z    user-message (word "There are too many cars for the amount of "0 z# K: q( R/ u, R  T7 c2 z2 k; {- i
                       "road.  Either increase the amount of roads "
  N( w* {: k7 v3 R; |" c                       "by increasing the GRID-SIZE-X or "  j; W- L! v# i6 \; l. u: G
                       "GRID-SIZE-Y sliders, or decrease the "& p% ]9 D0 E3 m; ~" Q7 _3 P9 R
                       "number of cars by lowering the NUMBER slider.\n"
0 H& v5 b& \6 e" s                       "The setup has stopped.")9 m6 a& a2 ]/ P. ^) g5 |
    stop/ _' R$ O" r4 Q9 c* }7 i. J
  ]+ i' V1 N1 U1 Z
/ K' ]$ d2 z! m6 j* l
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) J. z$ {* b# }, E
  crt num-cars
4 y4 ~+ W5 N9 ?! u. s  [3 r! }+ m- h; Q, `
    setup-cars5 }1 N' F  i# h8 p, \3 A
    set-car-color# A3 w9 Z$ O; F- g/ l! _
    record-data
% E( Y) ~; K2 ^& s  ]
0 Z0 x4 z: r6 _$ ]2 u, t! s; y8 D1 k5 M( P+ R
  ;; give the turtles an initial speed! u8 ?6 O. P/ Q5 Y; x
  ask turtles [ set-car-speed ]
: z, e& D! B; M5 p7 x1 g: D. A6 F4 l. m6 W' p* s" W! i
  reset-ticks
! v$ G9 C/ ^" y# j% ~* W" }8 Nend
) z8 \* ]. F* w7 v0 i  V) n) A  s: @* B- B' S, r- s
;; Initialize the global variables to appropriate values! s$ O/ ^. I" Y4 {, h
to setup-globals) f$ \5 K. o7 D$ Z# O* ]
  set current-light nobody ;; just for now, since there are no lights yet% c7 G8 v- D7 o7 \3 g1 G  v
  set phase 06 m$ X. x6 W9 h$ p
  set num-cars-stopped 0
$ ]+ O0 S) |3 F9 Q' h; {  set grid-x-inc world-width / grid-size-x+ x& t: V  f$ C6 {
  set grid-y-inc world-height / grid-size-y/ {! W5 @0 f4 L$ q$ N- E" e0 O
+ ?/ U- ^% O8 T2 ^: a4 B
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 H6 B* E* c" x2 f7 n+ T& D0 o; `5 l
  set acceleration 0.099
* R* W! s0 X2 H3 Z; e- x4 i3 P- O2 hend0 ^: Z  k$ H) R, G

8 B; `4 s1 U+ t; }& |;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ n- c1 A$ V" L9 y  {: F5 ?9 h;; and initialize the traffic lights to one setting
0 W3 M9 P5 |6 {- ^" Tto setup-patches) L) i3 B% s0 h' N# A; t9 [9 J6 D  O
  ;; initialize the patch-owned variables and color the patches to a base-color
2 S4 |/ ~2 C5 j4 S5 P* e  ask patches" F7 m& x1 {( D/ s7 P- u
  [$ x  ~; L' G: t9 `
    set intersection? false" o6 o, p! c0 k
    set auto? false
4 C3 H* O/ f, t: J" h' Z0 \- @6 z    set green-light-up? true
# L8 \3 m% |# i/ l0 W4 A    set my-row -1
& Y0 F; R1 I8 s% l7 B% }    set my-column -19 X3 z" ~# v, |+ s, E6 f, z& [
    set my-phase -17 x* \+ U6 z) \
    set pcolor brown + 3
7 P* z$ [/ W: L3 ~  W( R8 m  ]
5 Q0 a. a. P& G2 v$ n0 S. a9 {  V9 V! o9 N% Q
  ;; initialize the global variables that hold patch agentsets4 |; Q0 B3 m4 q! L. y+ f
  set roads patches with
# _8 m+ f0 S  d9 t9 N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 P4 n  V. l! {4 `; Q" G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ {" `/ L$ G$ {( N  set intersections roads with
2 n' I& x+ ]2 M& l: ]# L* l+ ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ D0 ~$ J: p' w5 y$ \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: ?6 t4 I) `' S0 p  X

3 O+ Z7 i- k2 K5 I: b2 d  ask roads [ set pcolor white ]
6 G# V, ]* {. B8 H- s# Y    setup-intersections0 T8 ~7 E& p0 L7 ?6 o
end( }8 ?: q/ g5 {+ Q  X: L
其中定义道路的句子,如下所示,是什么意思啊?2 O. e  c# u2 @5 g
set roads patches with* Q3 \2 {3 R$ o1 J" u2 {
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 N$ s! S4 n3 V5 M, W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- _( p  ]' U5 X7 p4 ^% a
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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