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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。
  A; h4 h. C! C: R8 b9 ?netlogo自带的social science--traffic grid这一例子当中,$ [1 l0 A* P8 l- O4 u. f+ o, ]9 P
globals
5 u: _" [# y: R. B[. U$ |2 r/ O* m5 I
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! [* P! v! N  z  `& Q. }5 u1 S; I  grid-y-inc               ;; the amount of patches in between two roads in the y direction
( J3 V$ q9 l4 M% G8 l! x% `  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ O& x3 _! t  s& V' B                           ;; it is to accelerate or decelerate
6 P' D2 x- ~+ d3 d  phase                    ;; keeps track of the phase( c# N& W! x1 q; o* J; G
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 W/ R, k/ c5 q4 }! u- `4 m1 h  current-light            ;; the currently selected light3 ~4 G. `9 N2 Q6 _
& Y6 o. ^* @, j  k  ~5 v
  ;; patch agentsets
! T3 p8 d; ?* n* ^* B. Y  intersections ;; agentset containing the patches that are intersections
! L- M/ P- y) W1 z5 p+ }  roads         ;; agentset containing the patches that are roads& b5 O9 M7 U$ W0 W
]) ?  e& K, v9 Q0 V  P+ n
8 O; H& H' `  L+ J+ B
turtles-own$ v% V, @& I0 T  v$ d& y" X
[, c; A* Z' C4 \8 R5 q! b8 [# k
  speed     ;; the speed of the turtle
. U0 c" s. }. g6 G3 I3 @0 g, E, q  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
5 x1 D  Q) x* B* U- m: O  wait-time ;; the amount of time since the last time a turtle has moved, @, m( K( z; s1 ^6 F8 C' o
]
/ N% {$ g! Y8 y- ^) G9 A. Q9 F; ~) x7 H0 p
patches-own; p  n. W+ A6 i5 C6 O; s
[
8 N6 C  K4 C! o  K# M2 F  intersection?   ;; true if the patch is at the intersection of two roads: @" D* ^/ ~& g4 L5 ]4 J9 |
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. H3 l% r2 C6 T% }! A
                  ;; false for a non-intersection patches.4 q% d0 y4 x7 n( U; S2 ^
  my-row          ;; the row of the intersection counting from the upper left corner of the
) w6 W2 m1 c3 G5 ^                  ;; world.  -1 for non-intersection patches.
3 r8 _9 h* p  F2 c/ |% h  my-column       ;; the column of the intersection counting from the upper left corner of the
1 J+ A* B  V4 `9 [/ H                  ;; world.  -1 for non-intersection patches.) r  Y! g8 q. n. B7 n1 s# z& S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
  ]- c/ G/ e* @; F6 S  auto?           ;; whether or not this intersection will switch automatically.* Z& q$ d2 \# G
                  ;; false for non-intersection patches.
  T2 X3 o! X. o; G# t]
( m$ S. O$ }7 V6 I
9 o! F3 m7 C% m  L5 B
7 I. d) A: g6 j# z6 P4 ]) G;;;;;;;;;;;;;;;;;;;;;;, T9 ^+ O& o4 X" ^
;; Setup Procedures ;;4 B& G- U! G# m0 j$ R! n
;;;;;;;;;;;;;;;;;;;;;;0 f5 t$ \1 k' [  E! c

( z& A8 h' q3 K) L  R; K3 S$ u+ k;; Initialize the display by giving the global and patch variables initial values.
2 B! b+ C4 x# V( Y8 F;; Create num-cars of turtles if there are enough road patches for one turtle to. M5 U% p- |. N
;; be created per road patch. Set up the plots.
9 B' J: K- ]! }+ Wto setup
( }% b/ S: ~7 Z8 g2 h' N  ca
9 ~4 [' n" n5 o9 M; |: N1 i/ _7 h  setup-globals3 y  j; O; W6 `1 t2 G, ^

( V' z9 t' ]7 G' l, X6 f( l  ;; First we ask the patches to draw themselves and set up a few variables
) a8 \5 f! J; L7 R  setup-patches+ ^9 U4 q* N3 g, E8 w3 o6 ~5 n; k4 M
  make-current one-of intersections
1 G3 z8 z! x# L  label-current
- b. _& N9 ?5 y' _2 c5 ]7 f6 P
# {+ K6 P( x8 G4 ~' q3 \  set-default-shape turtles "car"
3 L2 J, `! p0 T4 Y8 e
' n2 ^" c- x4 k/ A7 v  if (num-cars > count roads). a/ \" w: d* T% H
  [; F: A5 Y! A4 o; N, w- V9 r
    user-message (word "There are too many cars for the amount of ": g* F' c+ j: |* C( B6 ]
                       "road.  Either increase the amount of roads "
7 E: T- q. [  p) R) x                       "by increasing the GRID-SIZE-X or "9 Z9 T8 M: c: x
                       "GRID-SIZE-Y sliders, or decrease the "
( L5 s( |1 W& {                       "number of cars by lowering the NUMBER slider.\n"  ~7 R+ n1 P( o
                       "The setup has stopped.")
7 F7 ]; h( ?6 G    stop
' z" d0 U; c+ Q  z) J& F  ]  s7 g% R; P: U
# I. R& E; C& }& h9 ?- A/ ]2 K* m: C
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" g9 D. C, s6 X2 r1 W) @4 k1 Y/ R
  crt num-cars
/ v+ \, [: M# E& g5 a  [7 v8 T- |  Y+ ?$ w5 c* n
    setup-cars
% N. \0 H, D9 V2 V1 p    set-car-color' V) L0 {. K! Y% w1 F; t, F- F6 l
    record-data
9 K8 l9 U% j$ ]8 g% M2 ?  ]: N* z$ n3 |: C, p& G
* o& e) o+ [. g1 J
  ;; give the turtles an initial speed: }5 W# v0 |( j4 m% J- h# g- v1 u' X
  ask turtles [ set-car-speed ]
& r' p6 r' z$ e
. ?) t8 N# i5 _% d2 @  reset-ticks
! G: o3 }+ ]1 p8 {0 C( Bend
* e+ p: D0 c6 k* Q  W
( ^+ Z5 `7 o; ^: D* j' y, G;; Initialize the global variables to appropriate values
, V7 m( e, p4 m! k/ t4 b8 ^: bto setup-globals  _" ]8 p4 b% G/ P2 i5 s7 e! {9 x
  set current-light nobody ;; just for now, since there are no lights yet
) k* |5 L/ |. V! R9 t8 K0 C' V+ u1 b  set phase 0
$ W  v" @, o$ r; z# z3 Q  set num-cars-stopped 0' M( ?& Q& Q2 E0 V' B$ o
  set grid-x-inc world-width / grid-size-x* E7 y  h; q8 L3 K. e, y( ?
  set grid-y-inc world-height / grid-size-y/ [4 o0 m; V5 Z& t, R3 E

5 I2 D4 K7 P7 h0 `" o  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" r" {" B1 ]4 f  i: `2 g
  set acceleration 0.099
& g% J9 P1 E) s% i/ ^end* m5 f9 |3 p/ ?4 n4 l6 O2 Z( x( e& r3 r
0 Q, T  }! O1 {, v4 w: m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets," K; J* C$ q( Y( |7 e0 U9 R
;; and initialize the traffic lights to one setting' }3 [( M, v" I% f
to setup-patches1 J& ]3 A7 U; y; c
  ;; initialize the patch-owned variables and color the patches to a base-color
" H9 y' r- M8 _# p  H  ask patches
6 i) \8 ]0 w- J% Q: W  [
) O; |4 l  l, m; f* E8 j: {" s5 Y2 o. q    set intersection? false
5 H1 a' }1 x; G9 v, m    set auto? false
/ k' Q5 i  l* d! ~1 X( Z# R/ _    set green-light-up? true3 I0 G, U  S' s1 U6 M+ q& o
    set my-row -1
: q* c5 v. W6 ]5 f/ h+ ^+ n3 r9 ], i    set my-column -1
' v% |4 w6 ]" S7 c/ L( g    set my-phase -14 C$ }! l# r  Z' }  x" ]9 w
    set pcolor brown + 3
) [* o  c( h% Z8 H9 M  ]- I/ F8 j1 f" }

! V; J6 Y& c) q& @. M' c' ?  ;; initialize the global variables that hold patch agentsets
2 E) @+ G8 m; A+ D4 v) Y; W  set roads patches with2 X9 l' v9 q2 o- L8 R! O! `
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ D6 H9 ^! l" G6 @4 u- r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' ^5 `8 z0 H9 ]" n& c% c/ l
  set intersections roads with
3 }% `! I5 d( z# v& ^7 F4 ~+ L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 N$ L( q# ^- D7 @! F- p3 }" {+ a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 M0 s0 U7 t  T7 O# W% A+ S  h% P: `9 w$ ~
  ask roads [ set pcolor white ]
" c0 @+ k& r, e; h' s/ `    setup-intersections
5 k5 P  ~. Y/ r0 X& A  m8 Xend, K( W* V- U* x/ @6 ?  @
其中定义道路的句子,如下所示,是什么意思啊?4 H( T, i) w  U! H/ g
set roads patches with
  |3 O6 g3 @( p& G/ e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* ^! s* S7 K& Y; G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. L% P9 y; B2 H  U
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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