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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。! S% h" p8 n# {9 `0 @/ P
netlogo自带的social science--traffic grid这一例子当中,5 N0 v* G: N1 @5 {1 f( }" R
globals
( Y# M# q' a! [4 G: \( Y[
/ B2 b1 |5 u( o7 V' d/ B  j6 I  grid-x-inc               ;; the amount of patches in between two roads in the x direction
. K3 y' h0 {* w& X* l. y; {& c* n  grid-y-inc               ;; the amount of patches in between two roads in the y direction! c) j) O! e. j: z. ^
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) G& [& Y4 j  z0 n                           ;; it is to accelerate or decelerate
) e, J, ]; Z% ]6 u7 U  U* m  phase                    ;; keeps track of the phase
$ K8 e! W8 k% a0 u  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure) k+ ^2 F, J) m$ d% s  p
  current-light            ;; the currently selected light
8 }* J  g- I( [* I( a8 A% [
# n8 A1 \' W$ N+ q5 X, e( g  ;; patch agentsets
" i# c; }* `# `6 R  intersections ;; agentset containing the patches that are intersections
- a- l8 G$ L, `! ^6 v  roads         ;; agentset containing the patches that are roads
0 Y5 i( G; b" ?! h; \: S]! T! H8 L+ B. _$ _

/ T9 l6 S) Z) J; t' b, I+ i: wturtles-own' R2 ^2 r, d$ t! C, r. G. U5 \% m
[0 R0 y0 G, ^+ f% a9 `  b
  speed     ;; the speed of the turtle+ C4 L# j/ T+ E4 |+ s3 F  }% |! F
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 ]8 k+ j. l, m8 [- J1 C( y! A! A. u  wait-time ;; the amount of time since the last time a turtle has moved
+ y) k; ~# f! z$ U]
: L9 k  O7 K- G7 r; @$ h
% l- m& c( P. @/ Ypatches-own
) _# H: }/ A% V5 V5 p! k4 p9 V[
8 n( @3 u- X3 t3 S' A8 C4 M  intersection?   ;; true if the patch is at the intersection of two roads
, s! Q) x3 ?" Q1 g& L  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ s5 e4 X* Q' f3 V2 @/ s7 n                  ;; false for a non-intersection patches.# B& G4 B; i: }" J# [- x
  my-row          ;; the row of the intersection counting from the upper left corner of the
" q2 h6 L8 e5 r& h7 F3 H& r                  ;; world.  -1 for non-intersection patches.
4 z% K  U4 y" V) K  my-column       ;; the column of the intersection counting from the upper left corner of the
% |3 c- Q6 q1 M; c                  ;; world.  -1 for non-intersection patches.' k+ g1 K5 U9 P5 D: _4 P1 o
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: X/ \/ z( p7 I* v  auto?           ;; whether or not this intersection will switch automatically.
* Y; t6 Y' E, e. D2 m  Y                  ;; false for non-intersection patches.2 }( ?8 k4 ?( N3 i& c* o5 B: g
]
! I# l; I# {$ F& F- M; Y5 d
( A. q, ^' \% Y) p# k: W/ I" V
6 _# V0 T' }5 Q# f: Z;;;;;;;;;;;;;;;;;;;;;;
) [) U" d9 J0 i" S! f" y! t;; Setup Procedures ;;1 o# j6 `1 J5 X! k
;;;;;;;;;;;;;;;;;;;;;;4 `# U3 B7 u: R" m
6 Y# D- Z3 [% Y% J; H0 G( o
;; Initialize the display by giving the global and patch variables initial values.
& s% i- U" m9 C5 q$ h- d0 E- {;; Create num-cars of turtles if there are enough road patches for one turtle to
/ W5 Z6 j' |5 r- k;; be created per road patch. Set up the plots.9 w0 A7 S1 U. k
to setup
, e* D0 q6 n& S  A  ca1 g) \) R9 z0 ?, ^
  setup-globals
( V5 B; U) L0 i) N' `, Q" i& Q* }4 U& P  y2 p7 Y
  ;; First we ask the patches to draw themselves and set up a few variables
8 T& C( ^9 i1 ?4 F5 W5 t  setup-patches* e3 X- d) L& x7 b1 x
  make-current one-of intersections( v8 x5 P  n. I' w  S6 P
  label-current& O) L) E$ Q# v, F0 A

$ M4 z/ x9 A7 M. y( p$ m: N  set-default-shape turtles "car"! I5 g+ V4 o. i- u# d8 H

6 h; z$ L; f! c# y) b; W/ }  if (num-cars > count roads)
6 U8 d- J) c" m, A  [3 W- ]& y2 r; k, o/ x* ~/ `
    user-message (word "There are too many cars for the amount of "
& E& }  b. N2 C                       "road.  Either increase the amount of roads "
: B' m$ ]" K% ~/ `8 ^. P: R5 R6 t9 C                       "by increasing the GRID-SIZE-X or "
6 e6 H; H& q, l                       "GRID-SIZE-Y sliders, or decrease the "
( `8 x  j/ e/ \                       "number of cars by lowering the NUMBER slider.\n"  i% A9 ]0 D0 Q6 T" w, s! B
                       "The setup has stopped.")( p: k+ g, E7 B: X' S
    stop
4 E" j5 Q2 G& E. i  }/ d  ]
# X" j+ U+ K7 m9 C9 I& x
- ^" [2 Y7 X4 @4 i6 \  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ \% n/ S+ C( H4 H) A  crt num-cars
2 |, n8 m; S; r6 V5 r) F2 t  [" w5 I* t( s1 I
    setup-cars
  U- ~7 s! F2 c7 P- m    set-car-color
4 _6 @4 j4 q* ~( p    record-data
7 R6 Z9 v: y& z( y  ]) M+ y- L& q: T8 t8 K
+ ]1 U2 y8 k! U/ }; D1 b9 g! X- W
  ;; give the turtles an initial speed  y) X8 h6 q) f4 m4 G8 e
  ask turtles [ set-car-speed ]: Z' a% K! `9 n/ l% E$ |! g) ^& z; D: R

" A4 h, Q: `: ~: [& @" Q  reset-ticks- r# b0 @3 @2 F8 a/ h1 ^
end% B# q" ]* B% m" H3 N$ Y0 w

' z( W! P# \" H) P8 j;; Initialize the global variables to appropriate values
% P0 v. T' c* M* Ito setup-globals& {8 `" _7 J5 R
  set current-light nobody ;; just for now, since there are no lights yet
; r1 a1 k+ S4 b, o( t9 p  set phase 0
' K% S1 e# J& z& \5 t1 c# l  set num-cars-stopped 0% w7 F8 d. V: E5 j6 E% O9 ~( R. E
  set grid-x-inc world-width / grid-size-x
1 `: E# ~  o% s0 a7 a8 R3 Q" ?  set grid-y-inc world-height / grid-size-y9 Z# X* V- l* u% R9 j2 B

$ Q( t2 a! n& b: g+ l( t4 e6 T5 R  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; B: v. m! ^, n, ]  j  P7 Z4 |- m  set acceleration 0.0993 _' a; `2 s4 P5 r
end! w/ t1 O/ R* |" H- u0 G. |" H
2 ]; A+ M+ Z" I4 [, H" D/ i7 c
;; Make the patches have appropriate colors, set up the roads and intersections agentsets," I: m5 S7 ~- [+ y2 M: i
;; and initialize the traffic lights to one setting, {" j# O3 w, V- i1 }
to setup-patches
0 l' D- {$ C5 B( M  ;; initialize the patch-owned variables and color the patches to a base-color; w) w% }  l4 P+ }( B  \/ S
  ask patches! g/ y. N' Q  A1 X
  [) n+ S2 X, @7 v5 _! S. c
    set intersection? false
0 J. u! U4 X. f/ }2 C) R" q    set auto? false
6 W: d: [5 |$ `# D    set green-light-up? true
; g1 T+ H: h' T0 {7 _    set my-row -1
# j7 ~4 q" \3 p: \    set my-column -13 |3 z+ ]) O- z: k  o3 _
    set my-phase -1
2 Z" P! L5 B$ \2 F) ?  T2 c3 }1 y+ |    set pcolor brown + 39 B7 c' N/ _! L- {( k
  ]
/ E* X3 A2 W0 ]% ?# ?- P3 X: |
$ D9 N: B' R% _: j  ;; initialize the global variables that hold patch agentsets
/ F( W  E7 F* Q) ^+ K  set roads patches with
8 L1 g+ \6 Y7 K. l2 R5 Z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 H0 z" B8 c  z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 G* T# A0 w* m9 c, u. d
  set intersections roads with% B7 `. N: U5 Q" F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: L% _- D+ ?3 d9 v/ w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& ~2 U& [/ ^' G* }, |% p" I

1 B) s* `. h* r/ x; y8 G  ask roads [ set pcolor white ]0 r0 e) U7 X* \) _5 m$ Y* e- ]- `
    setup-intersections
  v3 X2 N: W% n- \  o- r! e; I, }end' z+ J, ?4 n6 u& F. i" W* h* V
其中定义道路的句子,如下所示,是什么意思啊?; c& ^# p8 L6 j; X& J$ X9 y) i8 y
set roads patches with
+ {" L( y" x" B# x1 E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ S1 a) P3 S& h9 ?4 _" c2 E# h$ d    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 @6 z+ B  o8 Z* G  M) s; q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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