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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。
8 \; a4 X1 x4 C2 [* fnetlogo自带的social science--traffic grid这一例子当中,
4 q: ]+ u) E/ u' ]globals) O" g) H% D/ k* L
[
/ f2 |; T+ P5 ?4 |( J  grid-x-inc               ;; the amount of patches in between two roads in the x direction; M4 ]3 [' L, N6 o/ ]
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
) C" G2 I4 X7 J# T0 o" H  x4 I" P' B  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# ~  P0 t, J' E5 |- k9 T. s                           ;; it is to accelerate or decelerate, I$ w9 j- g- L  p
  phase                    ;; keeps track of the phase
& E8 ]  c  O9 g- i2 g' x: e. {6 \  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! ~5 C2 `; ?( f3 Z" X
  current-light            ;; the currently selected light3 @$ G5 B2 _) Y. ^( R' b+ Q4 Y( x
& c8 O& N! `8 y
  ;; patch agentsets/ q, u; B4 _0 C0 x) H- D% E
  intersections ;; agentset containing the patches that are intersections2 s" g; D) R1 j) R' @! N
  roads         ;; agentset containing the patches that are roads, ~, k$ x9 S3 N5 s" f. O& W1 N
]0 v3 E0 W7 j8 q* p$ g3 `
) `" y$ O4 g. M- {3 J$ j
turtles-own
& {: R- ?$ z! \* ]& I* ^1 z* ~[
  N, I7 t9 d1 p0 n8 F  speed     ;; the speed of the turtle! p, r( v- g# a' k" D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ _/ v% _$ L0 e+ U1 o, x
  wait-time ;; the amount of time since the last time a turtle has moved. P$ C1 }6 j( L7 n5 r6 K: I5 C2 G
]
# R. e. S7 j( C: E7 n" z8 t, [6 S5 Q7 H( ]4 M
patches-own$ P$ C" y" O# M. e+ g+ _1 c8 _
[. r0 Z5 Z$ C4 p6 t: n; h) T
  intersection?   ;; true if the patch is at the intersection of two roads1 U% N/ N. f3 B( P: z' y
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.: w: B2 E9 r( W4 U" E
                  ;; false for a non-intersection patches.; u6 c: L# ?# L; X
  my-row          ;; the row of the intersection counting from the upper left corner of the
: b0 a* ^1 r: C! |                  ;; world.  -1 for non-intersection patches.  u/ G! N+ H4 x( |) A5 q+ k7 C
  my-column       ;; the column of the intersection counting from the upper left corner of the
8 U- A9 R$ z) u/ `' h4 W6 G  i* ^                  ;; world.  -1 for non-intersection patches.
5 h. v" B0 u1 E: Z( L( h% J  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; L. U1 f% L+ V1 ]  auto?           ;; whether or not this intersection will switch automatically.
8 p  g0 Z( W& Z& [; S                  ;; false for non-intersection patches.1 W' M: }6 {+ g  b# H& G2 s
]  o; U. X, |. i! D: J

& ~/ a( w9 v& \, ~4 Q. G
, t1 ?* a* Z2 l0 w) k;;;;;;;;;;;;;;;;;;;;;;1 \3 K( K9 [0 R% G; {2 {
;; Setup Procedures ;;
* {" ?5 D& x3 B* g! }* z' P1 s;;;;;;;;;;;;;;;;;;;;;;
) u( @& Y' m# Q3 v# L& V8 Y7 f# i, a6 B3 ?4 r' A: B$ Y
;; Initialize the display by giving the global and patch variables initial values.4 R# [/ y8 Q8 m& |: O2 u5 n1 y& |% c
;; Create num-cars of turtles if there are enough road patches for one turtle to; T7 z3 w3 n. G$ s$ j
;; be created per road patch. Set up the plots.
+ w0 f4 T8 I0 g$ Y) P; e( d3 sto setup2 L0 w2 Y5 h* ?6 e8 e- G
  ca
- q3 W8 e5 @6 c! d# U; I; J  setup-globals2 F3 i1 m: \5 t5 z' C4 g. B, @
' D/ C) l3 P, A6 a2 D& h* K# Z7 L
  ;; First we ask the patches to draw themselves and set up a few variables- ^" i& Z. I1 z. ]2 C
  setup-patches
3 G6 ^# R  z* W  make-current one-of intersections
+ i6 V2 }& z6 L  label-current
* b: }! N, f' |- \3 p. S+ W0 s: x# M: _" S& G" S: V1 d+ }# {4 H
  set-default-shape turtles "car"
" c' d8 |4 k  Z6 b$ m. s  f0 ], P8 z) y  U9 ^, Q" k0 ^
  if (num-cars > count roads)
  |6 B9 \$ i: m" J% p6 V# l  [
6 B; N! C" t" d. ~    user-message (word "There are too many cars for the amount of "% l+ z& Q- {% P8 j
                       "road.  Either increase the amount of roads "
& U8 E6 z, \9 @; O# I, m8 {                       "by increasing the GRID-SIZE-X or ": l/ a: ]% r; w9 T
                       "GRID-SIZE-Y sliders, or decrease the "
* l5 w( O) [5 V                       "number of cars by lowering the NUMBER slider.\n"& G* F3 t# N+ F) }* k: x- k$ ]
                       "The setup has stopped.")" y" D' |6 C% X+ R7 W, A
    stop
" X9 y) K0 p. f5 E% E% m8 t! b  ]4 s3 ]6 G5 b+ V0 ?
9 c$ V0 s. G& b$ X* `0 ^0 A* b- \/ S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% G: c3 B7 ?/ A6 V  U0 Y  crt num-cars. Y/ |7 n  b3 |1 `$ h% I- z
  [3 C/ G' \1 `0 x& L& p" G
    setup-cars+ ?$ w) Q. p- O$ i9 r
    set-car-color0 e9 P$ V" w3 {' `$ ~2 \
    record-data' ]8 ]6 `2 z  R  c0 y& g% Z! Z" L
  ]
) _3 b3 V  A! J* k* V5 E: K7 c/ Y( s) y6 Q
  ;; give the turtles an initial speed
/ s$ @0 S4 A7 {# v. g$ B9 P  ask turtles [ set-car-speed ]7 E& U. E" F+ j% o; }

: B# h5 \: K* O  reset-ticks
. x+ c9 \; v. m# |8 _end5 C  B  l; h& z4 @0 e5 D7 _  Z8 s9 \
1 d+ G# \4 k6 V2 y% H- v
;; Initialize the global variables to appropriate values
. E0 `  u3 B. j# p% Qto setup-globals8 V+ U+ \0 \2 h
  set current-light nobody ;; just for now, since there are no lights yet9 q7 ]9 O4 H7 q3 D7 B* Y4 `( d
  set phase 00 S. e  a- z% L% h7 E2 M% P
  set num-cars-stopped 0
$ h/ W* Z- S0 d0 Y  set grid-x-inc world-width / grid-size-x
2 g; \7 i5 \9 w  set grid-y-inc world-height / grid-size-y
( A' t5 C; ]7 k. _( R2 F+ T
; n4 c7 ?, Q1 D0 l$ p% Q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 p2 f5 y& p2 _: H& c) z& N
  set acceleration 0.0996 F) C; q% d+ t) Z! v
end
* X0 J9 a! i' w2 s6 t, \8 R9 O% o5 d' j+ T( `) y* h, Q
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ k6 C# K- O8 V- H
;; and initialize the traffic lights to one setting
. S6 `9 k! e  S5 z8 Bto setup-patches
$ l0 o$ ^1 N; u0 J  ;; initialize the patch-owned variables and color the patches to a base-color
( I# _7 ]6 I; u" ^, y( F8 j/ Q  ask patches' M: [* }; G1 _3 i
  [
7 X; r4 P! x1 C# S  `' e    set intersection? false
+ v( ?, F6 N  M8 `# D1 q    set auto? false8 ^1 B- U( ]% i8 e0 W
    set green-light-up? true
% T1 b5 q. e* g; o0 p4 i    set my-row -12 O: y$ K' m( K7 ~
    set my-column -1
0 E5 E0 R: J$ K    set my-phase -1
( m9 [  m* I4 g4 C( b% w% M    set pcolor brown + 3
2 T! N. v1 E% A- z  ]
( h0 E$ z7 i2 i/ v, K% i+ ?  ^% H* ~, q
  ;; initialize the global variables that hold patch agentsets
# O. M# @8 r# \8 W3 V% r# ~$ }  set roads patches with
7 c6 E; e* ^8 A( \! x8 `$ R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 E  m/ V* t. w1 X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ w8 v# ^4 [( ]* P9 V; v+ h; W  set intersections roads with
. g4 G0 t- }/ ?# a    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ r/ R5 o. a1 V2 {: x' R6 P    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ C8 r# g1 u  a$ U$ G& u/ b7 K/ d# ~7 \5 ~& n! u; y2 n
  ask roads [ set pcolor white ]
/ _# C5 r  J9 v7 a6 M/ o    setup-intersections
7 r" c1 g8 q" C7 Z+ Z" z# g+ Z  b% b- f0 Zend
0 E4 {; r% b+ w+ Z+ ]7 f: H0 t, e, m其中定义道路的句子,如下所示,是什么意思啊?
! u; [( o. ]) d  B: ~ set roads patches with
0 q" i6 Q9 N9 f1 _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 @, |7 `. `4 \! H
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 F" f6 @. x  C' a' J6 U3 W/ o
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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