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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。; W7 B3 q" |' m) J3 l; v( T
netlogo自带的social science--traffic grid这一例子当中,# {- X3 n3 H4 {) j
globals& f! b. I4 E3 S+ r0 m" K
[
8 T+ W3 g3 o* ]4 f8 s  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ W3 N- M# d* M: u) Q- E2 V5 |
  grid-y-inc               ;; the amount of patches in between two roads in the y direction( @% ]1 S% R  S) O* _& ~9 d9 v* e, z  z
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if5 |5 Z- ]4 G( H- V& D
                           ;; it is to accelerate or decelerate
8 y; }* d7 s8 Q+ a+ i% S% u  phase                    ;; keeps track of the phase
0 f* k/ E" d/ x8 S0 D5 x; I  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure. K' V! c( Y+ B6 H4 A
  current-light            ;; the currently selected light0 @* ^5 A, i  l8 p" ?" _! d
# ]7 i+ \/ k9 N6 ?  a' o
  ;; patch agentsets
$ C3 [; t# ], j# B: Q  intersections ;; agentset containing the patches that are intersections
7 r" z0 H! |; U; Q  roads         ;; agentset containing the patches that are roads
3 x" R4 b. u3 k; F0 P' S]: b$ p- R0 m' O2 i# V
/ g: O! U; U& _  f& [$ s( J7 Z4 L- z
turtles-own4 [) ?, Y5 q! n
[
% n, a8 @1 G  H+ t# H  speed     ;; the speed of the turtle
1 S# S7 `$ D4 D: N) _4 p% Y5 V5 g  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. ~8 L3 ]- h; X4 I  wait-time ;; the amount of time since the last time a turtle has moved' V% O4 u. S' c4 x; w0 g
]
. w# u( R+ W/ _6 g7 U- H: t
' Z' w, I3 M; F( x! xpatches-own. e' G1 I' [2 d) x& R" X
[
9 X3 c* A5 T0 s! x) d, e  intersection?   ;; true if the patch is at the intersection of two roads
" p& I  ]6 `$ N  green-light-up? ;; true if the green light is above the intersection.  otherwise, false., p# }: [) d' \  W" F
                  ;; false for a non-intersection patches.- f7 B) R" P+ @( J1 z
  my-row          ;; the row of the intersection counting from the upper left corner of the
/ M; \# {4 Q% K' O# a( W8 t3 Y                  ;; world.  -1 for non-intersection patches.5 m, K3 q& j, r. Q$ `  ~2 ~
  my-column       ;; the column of the intersection counting from the upper left corner of the1 Z6 E1 }1 u9 I) `# h, ~( F1 [
                  ;; world.  -1 for non-intersection patches.' j8 Y& j) m# V" M! \
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. c* y8 [: E1 ^8 f$ ~0 Z- O  auto?           ;; whether or not this intersection will switch automatically.
0 P8 x) G% X6 H0 W. h                  ;; false for non-intersection patches.9 c% W* S5 T5 T
]( \( x9 [* r, `  B# D

" Z2 G( J9 R5 a* V4 [& O
- r0 [9 _- g* K( H! i7 ~2 O;;;;;;;;;;;;;;;;;;;;;;
) b* |) t5 O- s( P$ O5 y;; Setup Procedures ;;
5 p7 C2 D  q3 s; p! u; N9 A8 L;;;;;;;;;;;;;;;;;;;;;;
+ Q$ |3 K0 e5 P# L! Y( ]! T& c+ u5 ?& h6 Y0 b% K0 ]3 W2 a
;; Initialize the display by giving the global and patch variables initial values.8 Q5 A. H1 A' K- S
;; Create num-cars of turtles if there are enough road patches for one turtle to
) a4 C8 B$ _+ ~;; be created per road patch. Set up the plots.$ A+ {4 w- \8 S) r3 u/ a: |
to setup
( l, I  w9 _0 ~1 l) |  ca" c- J9 C4 j1 h
  setup-globals
$ k3 ~1 ^7 e% M6 e% l! O# x& x3 k' v
  ;; First we ask the patches to draw themselves and set up a few variables
! _* `+ N2 e1 Y9 E. T9 P  setup-patches
# Z% D+ T& T: M+ O) l% a  make-current one-of intersections
9 ^6 @4 h$ D9 S7 M( H  label-current/ k; T8 ^6 h" Y; t- b9 z. P

9 S. z( P: o! s  set-default-shape turtles "car"0 P) i, W: N; l! i1 M3 k6 i) E' j

7 e: t" {' J) ]6 m  J( W; A3 a5 k  if (num-cars > count roads)2 r1 T; N* p  y+ W* J! p! l
  [
# a. d1 @* }% H; ?    user-message (word "There are too many cars for the amount of "
$ r9 v* P$ L: e* R, p5 R                       "road.  Either increase the amount of roads "
( ]3 L& z5 _$ i2 r3 D& K                       "by increasing the GRID-SIZE-X or "6 C# N1 w; U, i1 c. K' U
                       "GRID-SIZE-Y sliders, or decrease the "
; A7 v6 ]4 J# y+ x* h2 j0 w                       "number of cars by lowering the NUMBER slider.\n"
0 F5 z, k. F3 c- {$ f/ Z# a+ C                       "The setup has stopped.")
: m, f# ~1 d4 A! P( ^" B" @) ^& k    stop  K$ Z/ h0 ^) y- B5 U
  ]7 f5 ^5 j5 {: W& L( j  V9 C, b

/ ~* L3 \7 i! G/ e% M4 h  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, P" n. M% @  e( G
  crt num-cars) }+ k' j+ @( v0 l+ w% B: V7 A
  [: Z" p8 U& i# v8 |" C# a( H
    setup-cars
4 y3 r# `1 `1 z) B; G* b4 N5 h" {4 M1 w    set-car-color% P! Q( e  z4 i7 g4 Z
    record-data. F5 a" V2 C; b- l" W3 P
  ]8 ~4 I8 b+ U1 B
& W, y0 q' U1 X$ ~. d4 R# U1 w
  ;; give the turtles an initial speed% Q5 G! f2 F( p8 X0 l: [
  ask turtles [ set-car-speed ]: U# ]: N- I- E* O* ~, o% F- k% U
2 O9 b! V: z. `
  reset-ticks! i- B8 H5 Q- {- a* Z; o6 |- T
end
1 T, Q: N. N9 M2 J0 `
$ `) L& A, t# x( [0 @;; Initialize the global variables to appropriate values
* t7 W8 Z9 l- l; n/ [' g8 ^to setup-globals
7 j" g# c+ n- v& K# R  set current-light nobody ;; just for now, since there are no lights yet4 n4 S5 S) ^  ^( v: N* k
  set phase 0
$ X+ [3 S( T& u+ _! W2 y  set num-cars-stopped 0
- M, [3 W' C- X& s) z  set grid-x-inc world-width / grid-size-x
2 M9 Z4 g: J  v7 ?8 `  set grid-y-inc world-height / grid-size-y. e* q" B: {* t$ q& v0 A

+ r+ A/ M% g8 _  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) W* C- o3 H# u. Q  set acceleration 0.099+ c  O" c+ C8 g8 f
end
+ q8 d& N4 J) Y" t6 m) B
5 i* ~9 W# I4 T6 h. G5 A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 m; P+ W: D2 }3 k+ D3 ]2 h; ];; and initialize the traffic lights to one setting/ E6 ]2 ^& c; n. P# X
to setup-patches2 e6 ~! F; i, X4 u. r
  ;; initialize the patch-owned variables and color the patches to a base-color9 A3 s( L6 X  H
  ask patches$ ]" j. B' e1 F1 f/ ~4 L' a
  [$ J+ T7 {$ ?. v: X
    set intersection? false
5 ?2 `3 b& K! N+ m" _3 h; Z# C0 i    set auto? false3 t! Q# m* D7 O/ x3 R1 c
    set green-light-up? true5 e( }3 Z% ~% M0 {% h
    set my-row -1/ c) d% J9 Y5 P' ~3 d8 x, y
    set my-column -1$ D/ u& X0 `$ j; b. G; ^5 c
    set my-phase -1
  `& c" F2 N; \3 A    set pcolor brown + 3% t; L5 P3 \; \. G) g  v4 {
  ]
  c' g- z0 X. d5 u) A% O1 l* i: k3 T# @% K# n
  ;; initialize the global variables that hold patch agentsets8 u- S1 O( x$ ^# f9 d2 f
  set roads patches with
3 `& K* ^$ k  G, K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ X( d, Z4 V/ h3 ], ~' P6 N3 t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; V" ]$ x3 b8 O
  set intersections roads with$ r- n6 i, g8 h
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ {3 @4 F$ g+ h" A" N# Z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) o- z" @) U2 p9 s. b! `7 S  Q$ k9 x3 K
  ask roads [ set pcolor white ]% q4 b+ j5 A: L: q8 @' d
    setup-intersections. l* x! w( Q4 ^, X8 o% d  T
end4 d6 v8 N# \* k6 @3 i2 e/ [& K
其中定义道路的句子,如下所示,是什么意思啊?, S* p4 p$ O* y! ~# e1 e
set roads patches with
4 {) @9 @% w! Y7 ]7 D& E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 Q# ~) ]: M  M  m" |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( B/ j7 P5 U8 _# 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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