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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。  ^2 D; s" K$ S
netlogo自带的social science--traffic grid这一例子当中,
- B" r  i, w) r! j& @* P$ ~1 Nglobals3 ~& o0 ?$ l6 u
[/ u6 V0 |( Q0 O9 K
  grid-x-inc               ;; the amount of patches in between two roads in the x direction; k0 k, ]* h8 d! |" x. @7 A
  grid-y-inc               ;; the amount of patches in between two roads in the y direction; O# K5 R: v) ]) Y: s
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 G1 B$ T1 P, j7 B# H                           ;; it is to accelerate or decelerate' F; `( R1 N9 a  q, I& Y. n& [
  phase                    ;; keeps track of the phase# j4 T3 M& o6 [! d
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
8 e* J# c- l( x" x$ `0 I/ S: Y. W  current-light            ;; the currently selected light
. z/ o2 }" n. G2 F/ f; n0 ~% X% {0 n. E5 C4 h2 k+ |4 F0 S
  ;; patch agentsets! x- S  z  l4 J/ E; \
  intersections ;; agentset containing the patches that are intersections6 K4 n7 I/ Y4 b' ?/ r% E% Z4 F. @
  roads         ;; agentset containing the patches that are roads
' S& H0 P0 {# q3 _2 ?]
% `" l* u/ X/ b2 C  |# E3 t
$ ~% M% n: t$ m$ i# c5 Nturtles-own
3 a) H7 M7 U9 p* f4 T- G3 [0 Z, i[( Z; w: j. k( x0 `- |
  speed     ;; the speed of the turtle
. n+ _- I+ ~  `& W" K7 L  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ ^7 [" F- w' t+ y' I
  wait-time ;; the amount of time since the last time a turtle has moved' Y( l* c2 v3 E1 q/ x  \  D
]
! k8 ]; C, w# k. o
4 T- D1 M8 |2 O- [4 H8 t3 Npatches-own
0 L7 O9 n8 w% o: Z[
' y  D+ [+ G6 b) _& t  intersection?   ;; true if the patch is at the intersection of two roads
5 u% V* n1 L' E! X  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 {6 b4 [7 H! l! E                  ;; false for a non-intersection patches.9 M2 F7 \! y& A, K
  my-row          ;; the row of the intersection counting from the upper left corner of the; \, u! S/ u! N+ J' {" l+ F9 S; I. @- @
                  ;; world.  -1 for non-intersection patches.! o& ^& Y  l' H9 R0 P" o
  my-column       ;; the column of the intersection counting from the upper left corner of the% Q* L$ A/ V; x4 S
                  ;; world.  -1 for non-intersection patches.: h# e' l8 B( {( k8 g, c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ U! B6 A; B+ Y* N2 V- x+ Z& v' u0 G  auto?           ;; whether or not this intersection will switch automatically.
/ V  P  l, L; O4 [                  ;; false for non-intersection patches.
/ `) m9 ?2 X! R" k) d+ {& X- ]]
" s& |; L- O" U( r7 d: c' J+ X! t7 q

, U. B6 q- n$ e- H$ I" x;;;;;;;;;;;;;;;;;;;;;;
7 K! g7 A; O! I9 t;; Setup Procedures ;;
8 ^$ j' x/ M* `; ~6 n+ C& J;;;;;;;;;;;;;;;;;;;;;;
7 L+ l* Y  {" H6 Y) ^) u1 J& _3 w& p' L
6 |+ |8 A+ @* G$ [# s" d;; Initialize the display by giving the global and patch variables initial values.) F; r& D+ r4 F+ J
;; Create num-cars of turtles if there are enough road patches for one turtle to; B# X8 h  k7 y
;; be created per road patch. Set up the plots.( h$ S; ~+ W; i8 [  l
to setup5 j, z! v+ T) B4 C1 ^7 P
  ca: {/ y& w1 _3 f! T
  setup-globals
7 F5 j. p8 Z5 [- H
7 C1 H9 [+ h0 C; n  ;; First we ask the patches to draw themselves and set up a few variables
3 c+ I( J5 [) V1 M. r) o1 c  setup-patches. H5 K- H8 N- j% J/ R
  make-current one-of intersections
; D, j) j7 S( K  label-current$ t0 X- |" g/ I5 n4 }3 L
3 G" Q9 A# I$ h5 z7 W$ X% ?. s
  set-default-shape turtles "car"' H- C) h( _  n; e. b

% ]; Y6 {4 _' l, v/ Y: j  if (num-cars > count roads)( m/ U8 M2 z7 N) Q; o5 }
  [
. H8 x6 e* q$ z' g3 ~( Z    user-message (word "There are too many cars for the amount of "  D! \) @! ?1 M
                       "road.  Either increase the amount of roads "
. @! F3 Y6 l2 [6 ^; Q2 b                       "by increasing the GRID-SIZE-X or "1 [5 ?$ W! d% h8 C
                       "GRID-SIZE-Y sliders, or decrease the "
: W7 A' [; |/ |$ |* g$ P1 x                       "number of cars by lowering the NUMBER slider.\n"# l. s2 u5 R2 z' _0 m) q
                       "The setup has stopped.")9 v7 I1 _5 m8 e+ F. U8 W
    stop
( ^6 O4 X1 l  Q, ?  ]
3 q8 f9 G3 \) {, |6 A) f1 ~3 D2 n
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  G. o/ F7 g6 ~
  crt num-cars
) Z* j( F0 S4 V7 b( V" y7 K  [
! ^0 X, x. A/ |" R# H    setup-cars
8 w( x/ v2 {. M# X# S9 C    set-car-color# ~/ ^1 m+ j, q+ s9 w  J
    record-data
( Z& ?2 c8 z: `) M7 @& d5 O( T  ]
6 g# h9 J* _) c1 P) m' c1 _
; l: i5 ]/ b: G; f, w  ;; give the turtles an initial speed
: Q" ?  K" C' U% G" A* W' v: G& x  ask turtles [ set-car-speed ]
* l6 d1 Z0 `5 s3 x( ~- o4 [1 _4 L" k; N, n: e
  reset-ticks0 }" p/ n; @/ Q, {* Z, I0 Z* q/ t
end9 b3 n2 h/ D8 E3 e' m

  w" L- v. s( A' f  M0 h/ I6 U;; Initialize the global variables to appropriate values- b4 l9 L. g) i9 B# s' a; l3 f+ y
to setup-globals0 c# k! {: ~2 B) y3 H
  set current-light nobody ;; just for now, since there are no lights yet
8 D/ q! ]& X3 c$ y, n  y- s  set phase 0. m  g9 p; p  r( _8 g  @9 c
  set num-cars-stopped 0
4 Q6 N9 C8 _& v! {% r, w1 e6 c3 q  set grid-x-inc world-width / grid-size-x- X/ a. g: K0 p2 J+ [
  set grid-y-inc world-height / grid-size-y
0 K8 _* f/ k. ^- j/ U: x, @( [. ^
6 {. w+ v) O* X8 h  w4 B  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary  v; ?  }9 J- ?" D# x& H, U% e8 T3 U
  set acceleration 0.0995 F1 Q& L  ^! e5 O
end
1 C7 d( q7 K8 n( D7 g) ^( I: `3 ~8 G5 v3 K+ @, f% H
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 f9 b! }3 ^& L2 Q6 R. |1 K* W; `
;; and initialize the traffic lights to one setting
+ ^8 ^9 C+ o3 a7 F5 b; sto setup-patches' Y  D, r$ Z- Z* H7 m
  ;; initialize the patch-owned variables and color the patches to a base-color# T% n- y/ L8 I- Z$ I& n4 J0 D
  ask patches
4 l* S, g# L% R, @  [
7 X: W9 _" [* H    set intersection? false
3 P+ h! |! ?! ^- W    set auto? false
3 L1 R  w* D. ~6 b& H2 q    set green-light-up? true* p" Q% W" t# G: c+ n
    set my-row -17 V5 q% W" h/ I2 G3 R9 m
    set my-column -13 `- W* d% S  i! \8 K
    set my-phase -1
7 h; M" `" J/ R2 r, N+ K/ @5 `7 Q    set pcolor brown + 3. y; v8 Q; p. j9 C  K4 j7 K
  ]" h4 U8 I5 C& Y8 n

, S5 R( n* v4 D. e& a  ;; initialize the global variables that hold patch agentsets( \5 A" ~# C) t6 z+ s
  set roads patches with3 M) F. @2 @) G/ a1 t1 c
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 r, t) u$ m) q, H* e3 r2 G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 ]/ `8 Q5 R  l$ F, }- w9 n  set intersections roads with& [2 c" t+ c! I8 l- E6 t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# t" Q" ~+ z. S3 R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 M# ?6 C# @! r! Y' _* @0 F) i5 \; c; s+ d$ w
  ask roads [ set pcolor white ]: G% X8 E6 u" m2 f0 F5 g
    setup-intersections# ?! r. ~6 w5 q
end
: `# U5 \) v) [9 u. Q1 n; e9 B其中定义道路的句子,如下所示,是什么意思啊?
/ v$ E) W+ D, T$ I' d set roads patches with2 w! e% \- m0 r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
  |# v$ D* H. R) X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" F6 g4 F) }; S" ~# }+ A& o9 @  g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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