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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。
: n  A8 z" I" T' Anetlogo自带的social science--traffic grid这一例子当中,
9 H' u" q, d4 K. F0 Rglobals
. l/ {5 l. j! h9 I[
* D) o3 r( ]5 H/ U  grid-x-inc               ;; the amount of patches in between two roads in the x direction# @0 \5 M; ^2 F& r
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& q: L* u& e) s) Q# w5 {  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# D1 \) x5 N1 ~3 ~$ q3 ?
                           ;; it is to accelerate or decelerate( h1 O. N7 i. _1 ?
  phase                    ;; keeps track of the phase' k& m/ \* F; h1 w3 S1 ?9 h# F# \
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 ?5 e' u+ N" a6 [3 ?' G' p+ `
  current-light            ;; the currently selected light
) f/ O* c8 |' N0 K! L7 c
- \; n  j+ T" |! ~  ;; patch agentsets1 F  y! B- [% K' `1 Q$ g2 x& D+ x
  intersections ;; agentset containing the patches that are intersections0 ^1 V+ _# v2 p5 D" n: G
  roads         ;; agentset containing the patches that are roads2 k4 n0 Y2 A/ V4 K5 S4 l0 Z
]
3 q8 M  n5 H9 ~$ A( i
$ H, g) s$ }$ }1 t- H4 ?! dturtles-own
6 V1 i' O+ [7 V, J, z+ H# _[
) i1 {0 t- D7 V1 R/ |  speed     ;; the speed of the turtle
) K, m2 }8 ^3 _% O5 l  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 s5 B$ I& l: K
  wait-time ;; the amount of time since the last time a turtle has moved
) d4 P1 x1 ^8 g]
" }0 Z3 [1 I/ i- U
' K, F& u& J$ A" `patches-own/ M9 N" R7 J( _" S$ a
[
; V9 n8 l" d8 Z4 p2 O) M  intersection?   ;; true if the patch is at the intersection of two roads* G( L; R9 N  G% [9 Y1 o, u
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; q) B8 R, R$ e4 c2 q                  ;; false for a non-intersection patches.
. i7 x0 E. a! A  my-row          ;; the row of the intersection counting from the upper left corner of the/ O- f  x% C. g# Z! u: q9 q
                  ;; world.  -1 for non-intersection patches.. ]+ M& _! @; e, s) P
  my-column       ;; the column of the intersection counting from the upper left corner of the- Y, J& X+ j+ `5 W
                  ;; world.  -1 for non-intersection patches.# G8 }4 w/ l  S# i5 ~! a: G4 o( z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& x! a) c! i& j3 \+ }  auto?           ;; whether or not this intersection will switch automatically.0 Z- A  y) ?% u! O0 Z' H
                  ;; false for non-intersection patches., x& D. B6 u; ]2 I$ h1 v1 D- W
]' C) i) d0 o6 ]& p, e+ H: O
* Z) e- A1 Y2 w1 f" `- ~

- T* Z6 \( ^3 P- n+ \;;;;;;;;;;;;;;;;;;;;;;
7 m6 f, u9 f% I8 F" b  e* h;; Setup Procedures ;;
+ Y2 b4 K; n  J$ p6 \;;;;;;;;;;;;;;;;;;;;;;
7 I  p# F6 T( a$ R" g# x  ^! _
;; Initialize the display by giving the global and patch variables initial values.& A' c% E6 o0 G1 l6 F' V) f0 A
;; Create num-cars of turtles if there are enough road patches for one turtle to
, o3 e( V9 i5 W( m( d;; be created per road patch. Set up the plots.
5 W+ ?/ e# I0 l8 X+ f7 uto setup4 K: O* l- L  M
  ca
! m8 x0 l5 Y1 m4 N' q& q. r  setup-globals2 t% @9 k) H1 K! ?

, q3 n+ p# m- |5 U/ G  ;; First we ask the patches to draw themselves and set up a few variables; s4 k: R1 ?& K, i* ~: G
  setup-patches& c6 n# `1 C) r; K
  make-current one-of intersections7 w  b, o: c( p7 B. ?& A
  label-current  M" ~4 J% Z6 k3 U; ?: ]

0 \% V$ Q  Z7 e! e$ w( v  set-default-shape turtles "car"! h2 r/ p: T8 A3 @: N; c" _0 |9 b
5 \& `9 C) g/ c' ?' Z/ Z0 e  K
  if (num-cars > count roads)
* T6 q2 i  t0 N9 C5 j7 j! T. T  [8 K2 P3 V5 _: G, X
    user-message (word "There are too many cars for the amount of "' d3 Q, e6 _! h; Z8 p. {* j
                       "road.  Either increase the amount of roads ") ~/ G4 a; _/ n7 Z
                       "by increasing the GRID-SIZE-X or ", W5 d+ V9 X+ J/ W- o2 }6 k- r  J" w& S
                       "GRID-SIZE-Y sliders, or decrease the "
7 U" C) A6 \/ V5 A2 S$ f& W# n                       "number of cars by lowering the NUMBER slider.\n"0 i; r' @+ l1 ^) m6 V. `0 m
                       "The setup has stopped.")
# s! H/ _' z, F6 a! ?    stop0 |  J! l1 q6 n, i* {
  ]$ v7 t9 M$ [. ?( A; z' z% V

4 t: `  O6 g9 I* l' u# ~# M; {( `! j  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' V9 y  j& O: g& T+ \$ j) n  crt num-cars$ T0 X6 Q3 T4 U, C
  [
8 z! Z, ]( g4 t* @    setup-cars
& S+ Q" X! k6 G* R4 k* T8 X    set-car-color
3 X# z( S; V2 z$ \    record-data! i6 R- [- f5 @
  ]
) {9 U8 x. Q; U3 v: u& t8 F/ _. C, l
  ;; give the turtles an initial speed
5 J) N$ e% Q  J6 }  ask turtles [ set-car-speed ]
2 y: K2 v& `0 j/ Y& w1 ~6 o
! F( m) S7 _3 @+ a- e  reset-ticks" j& ]  _# ~% f
end% W8 z/ w& B: j

6 q0 f' i" z2 e3 I# E;; Initialize the global variables to appropriate values
3 |- l8 Y, Q  J" N( Tto setup-globals4 S6 b" U: j" j$ W' }! f
  set current-light nobody ;; just for now, since there are no lights yet
6 F/ O" a* N* j. Q2 Z+ s  set phase 0
; ~- b0 D, r$ @4 m  set num-cars-stopped 00 X: d6 [6 r- `  t3 \8 M, L" p
  set grid-x-inc world-width / grid-size-x, D; O+ V8 D8 _7 Q' D( j% Z
  set grid-y-inc world-height / grid-size-y# Z6 |* q* n3 B, F4 U
2 E7 i  r- n" I6 [* t
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 q. L; {* e7 S0 w) W# m/ k
  set acceleration 0.099. z# c9 _0 F4 `) |7 x
end
8 k% T# n2 |; o8 p
. D0 t) r6 K9 K7 ?2 C;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% A/ V7 H+ O8 @, ~# M
;; and initialize the traffic lights to one setting. W: b! z! Q2 q7 h1 X
to setup-patches+ o7 y; u3 f) N. P9 w) M& d
  ;; initialize the patch-owned variables and color the patches to a base-color; t0 f+ e4 h1 u: S
  ask patches8 |3 r& f* m: V2 k
  [
4 v+ h9 O/ N, S6 `* m/ u; ^. \    set intersection? false1 H; h3 e  X( y( W+ `6 D0 q
    set auto? false0 c+ h/ C6 A- W- e; r2 U! v
    set green-light-up? true& [% m  a$ L" y$ Q8 S0 q! w
    set my-row -1/ i. n7 G2 U; Y7 I
    set my-column -1/ z/ y9 x/ q) h+ U" _6 U- z
    set my-phase -1
2 B8 i1 I# y# D! |+ W# }. c    set pcolor brown + 33 {& k6 _- _, A3 y
  ]
* {2 V: M' G/ T9 T
% y3 b, u. x9 ^/ L  ;; initialize the global variables that hold patch agentsets
$ p/ g8 R; t1 |1 D0 q  set roads patches with" D! g2 q' p$ d1 J# B8 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" U) F2 T6 q/ ?: O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ _3 b2 M2 y* K4 M( f8 n
  set intersections roads with
2 t3 q1 j# J7 u2 m6 k* t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ O; C/ y+ o2 n& z2 I5 \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% O2 c& y, _# J. V: P, U# P/ f
, M4 g) |  A9 T- x  ask roads [ set pcolor white ]
  g; g" I; w8 U# h: O" O1 d    setup-intersections0 y+ e1 c& `% ]
end
( A$ ^' p$ u- i! s9 M6 {其中定义道路的句子,如下所示,是什么意思啊?
# k, z. W# v: h, p. m+ r6 p; A" h set roads patches with3 `4 p. A. V, d. {8 M; ~! ]
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 ]/ C+ A, G2 }
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! S6 ~6 E  v* q- q7 T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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