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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。
- O! ^' e; P1 c' V- Hnetlogo自带的social science--traffic grid这一例子当中,
1 V! C6 `. L" X7 gglobals- N0 g, R* L0 R2 s; s! d. d
[
* M9 j6 n  w: l0 [6 W/ {  grid-x-inc               ;; the amount of patches in between two roads in the x direction. ?4 M5 Y" l. {+ L: j- N4 b9 h( i
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' G& U' N/ z# t! y; b  acceleration             ;; the constant that controls how much a car speeds up or slows down by if* ^: T, r) H4 T5 X
                           ;; it is to accelerate or decelerate
# w  Y' ^* p& L# l: p* Y- Z1 X6 _1 Y7 X( m  phase                    ;; keeps track of the phase
" a" u3 e2 o4 c% L6 C  N0 j% `, D  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  n/ }0 _) K4 h6 f8 |+ y9 F0 V8 [  U
  current-light            ;; the currently selected light
' l& O' o$ B/ G& E/ ?( q% k2 o+ G# P& Y1 @* j8 V
  ;; patch agentsets2 R$ g" \- H2 {0 J! A
  intersections ;; agentset containing the patches that are intersections
6 N. ~, \- L. E  r8 i% p. U: F5 h  roads         ;; agentset containing the patches that are roads! `, C2 W3 S: N4 C
]
1 h7 m  D) P9 N3 n0 {6 l* J$ N
: c1 d) j  n  Qturtles-own# ]" h# E6 @) j( Q1 @2 P% k
[
. s1 U! u! M# f( u9 s5 W  speed     ;; the speed of the turtle, O9 e8 [0 e* u$ W6 K& X- m
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right- X9 |5 m: ~/ }! E( j' I, P
  wait-time ;; the amount of time since the last time a turtle has moved
2 j9 D% y8 G- q, i4 X]% B! b5 m/ m& ]8 N; d, o) R
) `8 p) B. Q- a/ `$ J
patches-own$ E5 D1 j# q+ M1 @' G& ^
[: |- k* G. ^* I" E2 t# G9 w6 e. A
  intersection?   ;; true if the patch is at the intersection of two roads( {8 a' B; Q2 a2 r
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' H' y& S& `7 l+ t$ m/ H" x
                  ;; false for a non-intersection patches.; }1 @% ^. a( a. F5 V! j
  my-row          ;; the row of the intersection counting from the upper left corner of the4 `4 m  f2 q4 B' }& ^1 p
                  ;; world.  -1 for non-intersection patches.9 M2 v+ d$ j+ h; N# O2 Z
  my-column       ;; the column of the intersection counting from the upper left corner of the
* k& C8 K4 O# B% p  R$ [* U( M) O" G                  ;; world.  -1 for non-intersection patches.1 y* D8 Y) t, r! e
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* G( _! o- ?- b# d5 h3 y
  auto?           ;; whether or not this intersection will switch automatically.
7 f" t6 C- Q1 c6 Z# ~: i, I, X                  ;; false for non-intersection patches.
  v1 d& {9 Q+ m6 l; w]! B4 M$ z9 F: o; L" a4 H

1 g2 G5 ]" K$ y* u4 y# T
  `% U" }2 _3 N& Q/ f% ]$ M;;;;;;;;;;;;;;;;;;;;;;
3 I' M: W* L. W, a7 k7 y+ U4 v;; Setup Procedures ;;
: ?3 P0 `. q) i/ v0 l;;;;;;;;;;;;;;;;;;;;;;
- v8 V& s0 ]6 v0 u  G" C3 D) s' l& w% `7 O
;; Initialize the display by giving the global and patch variables initial values.6 u9 Z! O, B0 J
;; Create num-cars of turtles if there are enough road patches for one turtle to
( i7 q' P% a$ U0 }' G;; be created per road patch. Set up the plots.9 q' H) y; B" v& H7 E. |
to setup
1 `3 i' O5 E" a; e  ca6 ^$ o6 x; B. e6 q
  setup-globals
; ?, k7 t$ ~# H$ o
' i, \0 S' ]  W- g& `2 G6 s  ;; First we ask the patches to draw themselves and set up a few variables& k# J+ j3 y% x9 ^, d
  setup-patches
* ^4 o& a, u. O  make-current one-of intersections7 P& m, G( [$ c
  label-current) B3 |$ S6 Y- o$ i
- {/ w0 b  x1 R  J# r- s! Q
  set-default-shape turtles "car"( o* s+ @. g. \3 ?' q: `! r. R

( m' j3 ^- }( {; S- w2 [1 w  if (num-cars > count roads)" s, d9 g7 c; ^! O; f1 x
  [
, M- ~* z  n& r- ~: S, e7 L9 Y    user-message (word "There are too many cars for the amount of "0 S  I8 Z5 \  w, ^  a9 E2 S6 y; V7 x
                       "road.  Either increase the amount of roads "
6 m6 s" O6 n: |- O" I& x, @                       "by increasing the GRID-SIZE-X or "; R% s' C0 e9 x" l. u& c. ]
                       "GRID-SIZE-Y sliders, or decrease the "
9 D) T! q+ _" g                       "number of cars by lowering the NUMBER slider.\n"
. s& ~5 Y5 z" j0 g* i                       "The setup has stopped.")3 f7 j+ g( b: o8 k
    stop- }/ ~& J8 T! X1 k3 {
  ]' ?! l: s! S2 H, ?1 u% Z

& A& E# A  j3 s' v/ ~  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 Y  {7 P" m6 }" ], u9 W, e3 ~
  crt num-cars$ M. n! C: ]2 Q4 h
  [
) ^7 a# Q% f; S2 B/ y; m    setup-cars
( x- ?( ?9 U9 |    set-car-color
4 ~. i6 A! t1 G1 S  `    record-data
" |/ _* e6 l, |9 L. ^  ]
8 d2 x/ Y) K" ]. b6 V8 T2 x
0 U$ C. H3 g2 Z- U! }  ;; give the turtles an initial speed) Y5 l! e, o& x
  ask turtles [ set-car-speed ]  E) |" C! ^( U# r+ S. }
5 b! ~  u8 E8 s- e( R0 I
  reset-ticks. ~. V. S$ q2 W' b1 B
end7 @) _( m6 W) J

* h& s0 Z! M- L; M4 t5 T& s;; Initialize the global variables to appropriate values
& L2 Z1 z; ]5 V" C# fto setup-globals
8 ?  E7 Z! g6 J; D; G) Y  set current-light nobody ;; just for now, since there are no lights yet
5 _1 s; m6 M& b: V! \  set phase 0
  c$ \& q+ j3 L+ Y' T" S9 t  set num-cars-stopped 09 O; R3 j3 d! T; A7 D+ V
  set grid-x-inc world-width / grid-size-x
3 _0 a0 Q) j- r4 y' i$ N  set grid-y-inc world-height / grid-size-y
- O6 c. b. `- \1 d- m% A& ^, y- b* P2 r# D# a8 j  T
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( u9 G% i3 l( B$ A
  set acceleration 0.099# |& I* c" \2 R: B2 ~4 x- I1 H
end
( D  n. ~1 Z- k7 ~4 O% Y6 n, e0 B% v- a
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- a5 w2 h3 X, Z: y6 i3 Z& S$ C
;; and initialize the traffic lights to one setting
/ ?9 |: G+ v& U) B# J" Bto setup-patches
. o" C5 |1 ]( M* K* I) K  ;; initialize the patch-owned variables and color the patches to a base-color/ r+ {4 }- k& F3 F4 E, d+ f
  ask patches
/ }% |# h& a4 C+ G4 |$ J' `  [, I2 r4 V; t9 ]  w  h
    set intersection? false# i; @; e6 L5 j5 m/ E2 Y) z# O
    set auto? false
# l0 [7 q: o, i% f* n) t; c    set green-light-up? true5 P1 l8 T  G) @# U; i
    set my-row -1+ Y5 N* k% ~, |/ P6 R/ L* J- E4 `
    set my-column -1+ b7 I6 M. d7 Y( D4 s. {" W/ K. g
    set my-phase -1* m( K/ w' k% G0 h, v
    set pcolor brown + 38 v; i# ~. ?; Q
  ]
; |2 i' @2 w' p2 n6 Y, z$ g5 E. O% g& S5 Z/ U$ V, |2 k
  ;; initialize the global variables that hold patch agentsets1 y3 y9 T& f4 j$ g& G' g2 D
  set roads patches with& X2 x' s0 {) H; g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 b2 i+ n- u/ G, }7 I8 o1 K- R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! E2 T& X, O* H! @
  set intersections roads with; E4 I7 l4 ]2 P" k  i' B7 }6 P
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 R1 C; u$ _: r3 ]% j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# s4 l' m7 c$ v; a4 R
) X) i% ~( M2 v3 M7 S" E; T
  ask roads [ set pcolor white ]& G+ o9 N% y" n* [( E
    setup-intersections9 l' G* _" {# I0 H
end
& B) C5 l$ F0 |" x  n) H; m其中定义道路的句子,如下所示,是什么意思啊?) w1 o: d  R  x; [
set roads patches with  x: q3 d5 F/ @* Y6 @2 Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! ?1 H1 o0 @7 R& B8 }9 E    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 C9 z! K: P/ a) z0 A0 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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