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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。
6 K% j! V8 V3 x! \( \: D3 S+ _netlogo自带的social science--traffic grid这一例子当中,
! s- p4 |# |# c9 y0 ]) cglobals
- f! Q2 M; E$ b[4 L+ b6 j2 T3 ^4 R
  grid-x-inc               ;; the amount of patches in between two roads in the x direction% L  W# s" r9 x8 R# k$ v" w
  grid-y-inc               ;; the amount of patches in between two roads in the y direction& ^) ^5 R- k3 G$ `" G2 J
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if1 x) O# |; g9 U  f6 l% a! }7 Z
                           ;; it is to accelerate or decelerate
3 F9 ]& d4 T2 ^1 F, {/ c  phase                    ;; keeps track of the phase$ T' s$ G- o4 @" T; ~
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ l: V- e: N7 j9 `) L9 L  current-light            ;; the currently selected light
& A3 \& `( U6 P9 }, \5 n! r5 O! ]& e# |- w: O
  ;; patch agentsets
% b2 Z+ u' D  n! ~  intersections ;; agentset containing the patches that are intersections5 i$ M  G- Y0 L
  roads         ;; agentset containing the patches that are roads0 m2 e' s4 ^) g) A1 A, h6 ^
]
) p' H% E+ R( d
$ A9 M4 j2 @4 C% A( e) T  mturtles-own9 Y! P# P% }  q( t6 ^
[
' T3 E7 `- I: Q  n6 n5 {/ D  speed     ;; the speed of the turtle4 L  b4 d- f: |8 [% g4 K! H
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
1 y. @# v4 l; X+ s% a' l  `6 [  wait-time ;; the amount of time since the last time a turtle has moved
  ^. p! C3 _9 h2 k, I' V9 D8 Q4 x]5 p+ C8 K5 o0 l( ^

' n( o6 h, `+ o* U$ E! v1 c( ypatches-own
# q) c2 |( H' N' {3 ][
# N+ T5 G! E. y/ |  intersection?   ;; true if the patch is at the intersection of two roads
, u8 D. R- {# U0 k  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.7 q0 W) R  P/ r$ C# }5 T* M
                  ;; false for a non-intersection patches.! y' p5 s6 M, a' d5 x1 C+ l+ G
  my-row          ;; the row of the intersection counting from the upper left corner of the
8 P4 C, V1 L( q; a: C7 v                  ;; world.  -1 for non-intersection patches.
6 f7 e( D. _( c/ y  my-column       ;; the column of the intersection counting from the upper left corner of the
# C; q! Q' ^) X                  ;; world.  -1 for non-intersection patches.+ e( V. U# b2 s+ @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' ]3 a! A+ ]% c$ L" d( t  q
  auto?           ;; whether or not this intersection will switch automatically.
( ?" ~; {, W( I& j                  ;; false for non-intersection patches.
" e1 B. S- J( M0 t5 Y- a  `( C]
) i* y9 T9 X0 y% t& i3 y- u- C$ @& x: V+ n8 B6 \
# k. t; {) O" G! L1 }
;;;;;;;;;;;;;;;;;;;;;;, q1 D! B0 r0 e1 `9 e) ]
;; Setup Procedures ;;, @% s/ i7 G  s% N; a& ^3 x
;;;;;;;;;;;;;;;;;;;;;;
7 h8 c3 u+ H% C* [3 D+ s4 Q) q2 t. m5 Z! d$ w2 N  d* W5 N. _* m
;; Initialize the display by giving the global and patch variables initial values.
/ p  _) K7 H1 A& w$ {$ X;; Create num-cars of turtles if there are enough road patches for one turtle to
! D! |/ C" {# ?# m1 @: r;; be created per road patch. Set up the plots.9 w9 G+ `9 Q7 F& t+ V6 \' S
to setup8 c3 q2 c% K; E) y
  ca- E  k0 D3 `% r' g: ]9 U! s- W. K
  setup-globals
0 @5 H* t# s% x" x2 O. S- G( U7 a6 S0 W! C5 o% t. j/ W5 ?2 k- L. N, t
  ;; First we ask the patches to draw themselves and set up a few variables
- n9 C5 @8 q( q& L7 n- D# `  setup-patches
! |! n- U- m; i8 ?2 L6 O# p  make-current one-of intersections
& S( M  O/ n+ b! I: J  label-current
6 g0 U; e3 r! S0 U% `. V
! K1 O" i9 ^8 j  set-default-shape turtles "car"
# e8 ^! P& q, g1 Q) t: l2 @! v
( [  N" A: Z* f- ~  if (num-cars > count roads)* I0 L+ j* F$ c6 U; Q7 [
  [
% t- _; q7 s* v/ ]2 R3 W2 p! {+ J+ K    user-message (word "There are too many cars for the amount of "3 y4 a) K5 O  q; v0 b/ O
                       "road.  Either increase the amount of roads "
% v) Y7 U8 w' O) t2 y/ S4 V                       "by increasing the GRID-SIZE-X or "" J* ~0 V+ G) J8 P/ a* N  T$ O
                       "GRID-SIZE-Y sliders, or decrease the "* w$ U% O* J1 I2 U* C+ \
                       "number of cars by lowering the NUMBER slider.\n"' t2 l9 a) ^) ~, Z0 T' ^
                       "The setup has stopped."). h2 V' J6 |, p) j/ C
    stop
  Q, i$ `$ Z2 Q! S  ]+ W( Y1 P. _* B- M& u- r& g
$ U( ^1 L" H, v8 b. w
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  ]( U) A! W) v7 h- P
  crt num-cars8 D1 V, F* t* x$ C4 X4 R! B
  [4 R- {$ @, S& D4 |
    setup-cars
  [  k4 G7 ?- t* C/ K) l+ O" D7 M    set-car-color) v5 C$ Y6 A% q( C% W, m5 G  l3 \; p6 Y
    record-data& v* J7 u/ _. B9 r9 t9 a6 F
  ]. S8 C" h/ j) i" }/ C8 o

; G0 I2 |9 k, \# [# d. e  ;; give the turtles an initial speed0 k/ o! b3 G: @3 Z- W7 @
  ask turtles [ set-car-speed ]5 g- w2 X! r/ }) J" |
7 L2 f+ Y% h; }# y
  reset-ticks
5 m4 m5 P; q3 p0 t  h9 aend9 a" Y. m; `% d' U9 u' r

+ g3 A3 f& q! L/ ?* r;; Initialize the global variables to appropriate values
  d) {9 P. ]7 F# T# Q3 @" Vto setup-globals
) K! l, S2 \7 Y3 |6 \8 M& ]+ u& Z  set current-light nobody ;; just for now, since there are no lights yet$ {& v' _: v6 c7 a* L+ H$ M2 ?' T0 q
  set phase 0
6 Z+ ]6 o% H9 X  set num-cars-stopped 0
6 P' T8 f4 p5 v/ h% O% H  set grid-x-inc world-width / grid-size-x
: s$ R$ n5 Y. Z. _  set grid-y-inc world-height / grid-size-y2 K3 }9 s  Y2 y

2 F$ f% ^! i4 Z5 V( {$ ^  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% W) R0 ]  i! o1 n
  set acceleration 0.099
0 p* d0 i: L# v" U" S. L' J' ~# r9 m9 z1 lend
) c; `9 v, m; B4 I+ J6 R# @" R; `; w* {) G+ Y
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 _+ p+ m/ v8 K7 [( o
;; and initialize the traffic lights to one setting
) t: E$ Z7 _. z% D# @  H# |1 Mto setup-patches
3 k* }5 n$ i! g, Y2 V- f- g) D1 m6 v2 F  ;; initialize the patch-owned variables and color the patches to a base-color
8 N' z& [4 O, L$ j; M  ask patches
# K* l. d( p( f+ h* Y, f4 v  [2 }1 a" h; C8 i" l
    set intersection? false
) J( l! X4 r4 v2 t1 b- J% v! [$ W* O    set auto? false: c) y" }# F& s4 y
    set green-light-up? true/ {% b- i, L/ C$ v& q# M* l
    set my-row -1& Y% y, B2 D* S% D
    set my-column -1
2 @- N, _) L) a  d$ \9 Y    set my-phase -14 }  ^/ `# v8 t) B& O: V; r5 b0 a
    set pcolor brown + 3
* J  ?2 e4 B. m  ]6 c3 o" L  C& g7 F5 `2 T$ v

* t' g* o* H% X  m0 a. Z  ;; initialize the global variables that hold patch agentsets
+ A- K( a( k* n( E6 g# k  set roads patches with
3 j% m+ o, X4 N# _; r3 ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 E3 @, C; Z- x8 |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 ~! @) S9 D$ `. |3 t& C9 b  set intersections roads with' h1 o) q( S* [" ~: Q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 M; s$ @, J7 k7 I8 c, c2 K    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# @8 ~; q% o6 e7 _
) |9 V& m; X! `+ `# e0 A+ k  ask roads [ set pcolor white ]% O, X: ]. T0 ~2 {+ m7 A0 o! G; `
    setup-intersections! R) ]9 `5 k, j7 E) O# _8 B
end
; u1 Y) I% F7 Z$ U其中定义道路的句子,如下所示,是什么意思啊?
9 U2 l/ ~0 @2 i# D. I set roads patches with
9 n- q1 Y& t5 u& b& G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  i9 ?8 x5 Z: u, @3 }  i
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& }6 Y* d) k7 E. S: [
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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