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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。
; t  W+ ~- q* k5 q* Tnetlogo自带的social science--traffic grid这一例子当中,
- i" l- M' @+ N5 H( Nglobals
' t' S2 f( y  Z2 z" l[
4 i4 L- E! [! W  grid-x-inc               ;; the amount of patches in between two roads in the x direction" z: W  f6 ]6 w+ o8 e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction$ z) S# P3 ]7 e
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: S3 J+ u+ K' D$ o2 L! d+ j. c
                           ;; it is to accelerate or decelerate/ H6 T! S; W* g3 ]% z% T) ]# v
  phase                    ;; keeps track of the phase
5 I* K# c9 }$ O+ T$ b1 j7 M( Y! s  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- Q+ V) ~& T" G2 Y' y/ a
  current-light            ;; the currently selected light0 }4 m1 \8 `9 p1 i. `, E$ h# a
2 `7 H+ l$ L7 U8 \
  ;; patch agentsets
* r; N# ?" o" A6 G7 A  intersections ;; agentset containing the patches that are intersections5 M' ?' d$ E! Y9 r  |
  roads         ;; agentset containing the patches that are roads- w( l( `  j& w* ]; W, H. W
]) ^. |* x4 n+ @! [. @  J

4 D0 |/ F, K. b  n+ ]turtles-own! ^* U: Z+ b  W9 a! c* Q
[
6 o/ ?$ U" s' @  speed     ;; the speed of the turtle6 ~0 R$ l* {$ U+ [0 w/ d$ N1 ?
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; b- R, i# d! H7 m  wait-time ;; the amount of time since the last time a turtle has moved3 q) T/ y0 T# @9 E
]
0 b* i. x8 v- y
' ?4 M/ i4 K6 ]8 W$ W2 W% ^patches-own' m7 U6 n, U5 I* H- B
[
" c. ~; F! C  V& D  intersection?   ;; true if the patch is at the intersection of two roads# u$ ?2 G9 w+ ~( A( r
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.! g+ T3 V9 K* q$ |
                  ;; false for a non-intersection patches.' O5 B; q& O9 p0 P* u( b
  my-row          ;; the row of the intersection counting from the upper left corner of the
2 L) I* E5 G. |: f" j9 `5 O                  ;; world.  -1 for non-intersection patches.7 L2 a" n2 b- C) D* S% ]* F/ G0 s6 f7 C
  my-column       ;; the column of the intersection counting from the upper left corner of the
8 d: K9 q# l6 c7 I) t) i) t                  ;; world.  -1 for non-intersection patches.! H; n- k, b& w! V- j/ z$ }+ O
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
: @% z: U/ @* {* H. x2 H  auto?           ;; whether or not this intersection will switch automatically.
) W9 T  w: {6 K% ?" y  C                  ;; false for non-intersection patches.. Q+ E4 e3 I2 W2 I, V7 V
]
* b) g7 q. I% k, I- f; e! p2 h2 S- S8 p3 \

; I: W; i* o6 Y" i" E9 O;;;;;;;;;;;;;;;;;;;;;;/ s9 }( {8 P$ [: P2 ]
;; Setup Procedures ;;4 \: r! z0 w$ _
;;;;;;;;;;;;;;;;;;;;;;, ]" D7 d2 m9 {5 f6 B$ ~

) f' @. f4 K, i9 s, a2 e) h( |;; Initialize the display by giving the global and patch variables initial values.
/ V$ t+ r* m4 c! ~;; Create num-cars of turtles if there are enough road patches for one turtle to. r# @1 ^9 }) C- }" H- z/ _) w
;; be created per road patch. Set up the plots.' \: _# t' T+ W% v
to setup
( x, T5 K& t: q9 G+ A  ca
$ ~5 y% t5 e( K* E2 w: J  setup-globals: X6 @9 T9 d1 G4 l& e

  ]+ N: S6 G# W. V, [: d  ;; First we ask the patches to draw themselves and set up a few variables
3 R' I# D+ `! E  H1 ?/ A! M  setup-patches% k2 x. j3 X/ Q' L+ s# D( B0 d
  make-current one-of intersections
% t# k" [; I& ^5 j0 o( Y  label-current2 y$ `8 X2 H, m1 f
1 Y1 L9 z3 U$ e' p
  set-default-shape turtles "car"% j, {; p0 i& a( C6 b  H
2 o  i; g9 {& H/ }
  if (num-cars > count roads)
7 X* @. e8 y4 j9 S8 R4 q  [
. l, B  _& o6 t! L+ L. ?$ I    user-message (word "There are too many cars for the amount of "1 `  U' \5 o2 A( p1 p0 b  O) R: B; v
                       "road.  Either increase the amount of roads "
" [# E9 o* Y1 T0 Y# t& o8 L# p5 ~                       "by increasing the GRID-SIZE-X or "3 B" n" p' ]5 v
                       "GRID-SIZE-Y sliders, or decrease the "
2 n2 |3 g6 c2 \& V( `! a4 n# Y) S                       "number of cars by lowering the NUMBER slider.\n"
) T2 b: u% V9 g; ?                       "The setup has stopped.")
( l9 L6 |9 @$ x( |    stop% H) r/ P' m2 F6 p2 Y" n2 G
  ]( @' v/ P: f3 t" D! d1 u

6 J) U- S9 f5 o* M  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: y- T0 A8 [9 m6 M' R
  crt num-cars
/ J- G! Y0 r+ V1 z, _& C3 w0 y  [
2 ?3 s$ e. S( v/ _    setup-cars& o2 T$ M; S/ `* ~% S3 l: U
    set-car-color
; S4 e. o& |5 n' g9 \    record-data
1 m' l' I1 @0 z! p( G' W; m  ]
# o$ L* S" P6 G0 S. Y3 V% w
- c. G# f. ^# E- d  ;; give the turtles an initial speed( x9 K! ^# ~7 V' ], h& ^
  ask turtles [ set-car-speed ]+ O. `+ w3 }$ Y8 T4 q* V

5 m. f2 I+ Y- o3 a  reset-ticks; f, W) u! {/ J( T; Z1 t6 v
end. Y: f) O( m1 y
$ O, `% \+ J7 B3 F! W0 [
;; Initialize the global variables to appropriate values
( h* C9 |: F! `$ i/ C, zto setup-globals' ?) E3 R* G* e; U$ z
  set current-light nobody ;; just for now, since there are no lights yet
/ u0 e  F" Q% M7 U& b0 ?  b/ b  set phase 0& p, c5 O: v) R* k) D
  set num-cars-stopped 0
# M% P3 w9 N/ h: c3 E8 S  set grid-x-inc world-width / grid-size-x
6 `% k3 p" [& v0 a; G" w  set grid-y-inc world-height / grid-size-y$ ]8 S/ J9 L: B9 W- E
6 a/ M% I8 \8 I: X
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 K/ Y7 D( X2 q$ a4 `9 e1 r  set acceleration 0.099
4 H0 \5 E- l& W  k6 lend
& p/ v5 C8 i  b: H3 g9 c, d* B9 c, v' O7 O& u- e2 ?2 J) i
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 @4 j6 F5 ]' v: v" c3 u% e;; and initialize the traffic lights to one setting4 B* q0 c9 v9 r" T) m7 j0 d. w
to setup-patches
1 A# R6 s/ t3 Z  ;; initialize the patch-owned variables and color the patches to a base-color
$ ?  Q8 Y) v  Z" _7 }/ o! }  ask patches
7 F* u% c8 J/ h* g( r8 @; |  [4 h9 |" H+ W. e8 o5 R8 \
    set intersection? false
, M( N" X9 }0 E* {$ E! A, b+ n    set auto? false
1 q$ m# t5 w' c" w    set green-light-up? true; ?2 [7 w: X; Z5 i* C
    set my-row -1
" y/ \- t& `' z; p' A3 {+ d    set my-column -1" E" u% B& z: j1 e( N
    set my-phase -1+ J$ \5 K: y1 }0 T4 y
    set pcolor brown + 3" l+ B: A5 d; U4 A
  ]# h; m( T& t- e- t( B

5 Q& \" t* D) ^* u  ;; initialize the global variables that hold patch agentsets. B: w* H: W6 G' v6 \
  set roads patches with# ?9 Q" c1 U( K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. ~# {5 [% e- v) W% h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 I2 r9 Y) x! {0 \7 L) s8 q  set intersections roads with
7 B; `# s& ~; e" y  H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& s' p) M, i$ ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& n& M3 |/ {6 h/ m' P7 |' A) l/ e
( G7 x+ X; ]0 d) V4 E
  ask roads [ set pcolor white ]
5 w( {/ J+ E; x4 W. I7 p# A/ H& L    setup-intersections- I9 e5 _& c  E# F' m! X
end
/ e9 c2 l) E9 E* ~: I其中定义道路的句子,如下所示,是什么意思啊?
! J. J: I/ o8 L" U9 g" ~4 e set roads patches with9 \/ C* }3 H6 r# D) d
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ a5 x9 f# x1 Q6 N6 _0 [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" ^2 d" r6 e, A5 Z2 ?! C4 b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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