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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。
, u  j! U& I+ t0 A7 e, s+ l3 Lnetlogo自带的social science--traffic grid这一例子当中,  B0 V) U7 B  J8 w, v; v5 ]7 i
globals
3 m: K  R% O& t[
2 |. X+ e$ r, [4 O- H  grid-x-inc               ;; the amount of patches in between two roads in the x direction
9 ?4 y8 n% N) [' M: j+ `# z4 r  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 `# s" k: x  S! {6 j6 Q
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if& {# u7 h; s' P: D% j- m
                           ;; it is to accelerate or decelerate
- A5 {7 E0 H2 f3 A( h  I  F/ N  phase                    ;; keeps track of the phase" B2 F' v6 A  H" _4 E% ?+ Y0 \
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure3 Z, `% s/ l9 d8 o% Q% H  S
  current-light            ;; the currently selected light
: |( W7 q9 d% |! T- H+ P" P% v% Q9 c: f4 \4 P6 o! V/ R. }# |
  ;; patch agentsets
' G$ e7 u7 P: C  intersections ;; agentset containing the patches that are intersections
( M+ T. @- ~( L! F) t+ Z  roads         ;; agentset containing the patches that are roads; U: R  u" ^; S( |1 g
]7 o! D, }$ i* w8 X  U( X; w2 e

. L! R9 [0 d0 C  f; aturtles-own
) U' u" I% D% i3 H) H0 G7 c[
4 ^. m8 {3 r  v& x1 Q  speed     ;; the speed of the turtle
! p8 c0 x: R: {( h  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 ^4 l& h- m+ P4 D6 ^$ S. ?* H
  wait-time ;; the amount of time since the last time a turtle has moved% ]* d, n; ^% ?+ a. ?
]
8 k( N: h6 x" L; w$ Z% L6 r* K. T# Z" y8 u% ]" D$ w
patches-own
: D; u( r/ d" K% o6 v( o, X[. o* a. R, T' r% j7 _8 o7 C4 H
  intersection?   ;; true if the patch is at the intersection of two roads: P3 a% I" D' `; w! x: X
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 w( _8 w. n) x1 r) d0 s; I5 R$ |                  ;; false for a non-intersection patches.
0 A/ }* m% O9 r$ i) U# L8 U7 j. s  my-row          ;; the row of the intersection counting from the upper left corner of the# ]3 u# Z* ?' Y; L
                  ;; world.  -1 for non-intersection patches./ S5 r! y, Y3 x' V9 \7 f
  my-column       ;; the column of the intersection counting from the upper left corner of the: O5 p* H$ g/ b( w+ b  d
                  ;; world.  -1 for non-intersection patches.
0 x3 r6 c. \" z9 G- l  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( _& m( V1 ~: L
  auto?           ;; whether or not this intersection will switch automatically.: O! Y; Z: p. ?# o& J8 [' G
                  ;; false for non-intersection patches.* r- c4 |1 P7 y1 W0 P; [
]3 z1 v- K3 N7 J1 u2 X! E% ~2 U
% w' Y+ e! R2 x/ n5 Q" p% G# R( o

2 o( ^% N* w7 ~$ t. A;;;;;;;;;;;;;;;;;;;;;;' K) l! Q! U5 |% `' i1 v
;; Setup Procedures ;;2 Q8 p8 s0 ?7 y& H, U$ d' a- J
;;;;;;;;;;;;;;;;;;;;;;" j0 F1 w1 w5 Z' v! \8 Z
2 v2 ]5 B7 \5 l; J; M
;; Initialize the display by giving the global and patch variables initial values.0 \7 L- i, V( S; v6 v
;; Create num-cars of turtles if there are enough road patches for one turtle to3 \# G8 i  e0 s' U6 I* b
;; be created per road patch. Set up the plots.
: s! z7 U+ t) _# lto setup  {# r% t$ ^  Z: }9 B/ [& n( [' {
  ca; b) m7 O+ u4 Z* d. I
  setup-globals( B8 T" r9 |8 ?) Q7 S4 @
$ O+ o8 B' L6 i0 `) Z0 W% Y' o/ C- K
  ;; First we ask the patches to draw themselves and set up a few variables
4 V  J, u) ^4 W* `9 Z8 W- z  setup-patches& [2 G) l; [; k
  make-current one-of intersections
( T5 s, y# J; C$ W, V: b5 e& C  label-current
( r9 a. M2 I$ ~* [$ X7 b& e
- h, {8 L/ d0 a& e" [  set-default-shape turtles "car"' D+ D5 F+ a2 D6 w# ~
- `7 ]6 J3 w; u# b9 d
  if (num-cars > count roads)! p4 @# U+ i+ J; ~. r8 |% ?; ^
  [& [4 {; p& e. b2 G0 w
    user-message (word "There are too many cars for the amount of "" D) ~4 L( N5 B8 I" m- Y" d( Y0 z
                       "road.  Either increase the amount of roads "
% u) s) e0 G2 U2 O1 P: g! b                       "by increasing the GRID-SIZE-X or "3 `  ~/ E: D1 g8 o. r; m
                       "GRID-SIZE-Y sliders, or decrease the "! J9 f( {4 X5 Q( e7 m* g
                       "number of cars by lowering the NUMBER slider.\n"+ j  A2 f8 ?5 ]2 S5 z" s6 S
                       "The setup has stopped.")
9 a) m0 ?! M3 ~1 @    stop, V* B; X9 c+ x) e/ N* B) x
  ]
! S4 i# h$ R: Q+ d! p0 }5 J' [" e! G# B; M5 N  m* v1 v
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) Z; _9 \8 t2 _4 s9 Z+ {7 X  crt num-cars. E7 V1 l% i* s' V+ {
  [
& ^0 e& r: K$ z, L    setup-cars
0 Z; @7 J2 |( K7 o! }- A    set-car-color
% I9 a6 C8 H7 ?    record-data& h0 g' `# T8 b: I; B. }) v
  ]
% C2 E& R0 H2 s& b; i+ Z
, ?) @7 }# z7 ?) p# Y2 h  ;; give the turtles an initial speed
3 J( ]" f2 t2 l' o8 N- n# a  ask turtles [ set-car-speed ]
0 F( C; t) T$ p0 J+ x! k3 e5 [# a: \5 G) Q3 F: k
  reset-ticks, R) e/ O% e8 P% x
end0 {! x7 v# T; h

# V' V& S  G: a9 S- U% e/ S;; Initialize the global variables to appropriate values
  X. s8 R* u  j" L7 U: B" b- D/ X, [to setup-globals
% _: v1 c. M* M6 N/ c' D  set current-light nobody ;; just for now, since there are no lights yet- B1 Z" a- ^0 B" G+ T
  set phase 0* K$ l% [# s5 y+ c
  set num-cars-stopped 00 A, z" Q# C* h9 T
  set grid-x-inc world-width / grid-size-x
/ q1 e2 K, H# W& D; S" ]  set grid-y-inc world-height / grid-size-y: J$ g0 r; p& a) E! Q# l' `

. j  f4 S. l# y5 D1 T% [* a  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 a* m/ K% @9 K; x7 V2 A2 I  set acceleration 0.0999 \  r* V5 S# D: b, S$ a
end
' _8 ?5 e' w" r3 x( U- R- Y9 Q4 O$ D8 A& j
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 D5 F7 T2 [( ^0 O# z" k4 m! \
;; and initialize the traffic lights to one setting
* A4 _' h: [: y8 u% |' G/ tto setup-patches
5 g0 ?2 `/ g" B  ;; initialize the patch-owned variables and color the patches to a base-color( c& U$ W: Y  b
  ask patches) o( h  c+ ~/ ?* D! [9 C
  [- _% n; U2 `3 T
    set intersection? false( A7 |) I1 }$ {7 O0 e& y6 C) L0 P
    set auto? false5 G7 `% d1 P- K1 ]- R0 I5 n
    set green-light-up? true
  ]* {7 @2 ?, b    set my-row -13 v' I+ I2 h& j: I8 T- j  h- j# q
    set my-column -1
4 ?' I: I) y: P7 S3 I  t; T    set my-phase -1
$ q2 T% c6 c" S6 C4 M* z    set pcolor brown + 3
+ {+ n& M+ H8 W9 ]3 b9 s  ]' N3 l& ~- c# r4 i5 i0 L. M

7 D$ y! Q' O% i* b- a+ G4 m  ;; initialize the global variables that hold patch agentsets
% ^% w3 \9 x& m8 t! q4 W  set roads patches with
/ T0 m9 y- N1 g) `* t0 W, n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ K" T, O5 ~$ ]5 B  Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) B& @) x" Z( c3 v  @. c& M% t
  set intersections roads with7 i4 f* l% r- H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 ?, a8 V. I2 W  ^( }$ R( y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 g# y: P* W) y: y  ~9 A% C) @& U+ N$ |! F: o* T. |
  ask roads [ set pcolor white ]
9 h6 f& E# o- w$ M: ]) h, g    setup-intersections
/ Z8 X6 _3 A5 Z! m5 g$ xend
. o! `# f7 R* b4 Z3 y! f& x其中定义道路的句子,如下所示,是什么意思啊?
; Q# X' R+ B% d8 s2 W3 j% v  r set roads patches with
: w7 ]' c* n' v7 |- ?; f) j0 O5 R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% E1 l3 u2 H9 O4 ~9 ~3 o5 O    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 W) s* p5 c8 h2 }
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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