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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。  Z$ ^1 ~1 c6 b/ f( g7 w: W
netlogo自带的social science--traffic grid这一例子当中,2 c# K9 A$ l; t; G+ H
globals/ Y0 W$ |8 w( [  w4 [( e
[
( T2 V6 P: {0 `1 w- n  grid-x-inc               ;; the amount of patches in between two roads in the x direction
- F. G3 F* f+ s" o- ]) n5 M: C# c  grid-y-inc               ;; the amount of patches in between two roads in the y direction
& m3 s1 d1 Y* V* e7 E& `  acceleration             ;; the constant that controls how much a car speeds up or slows down by if& \" ~# ?. {  l' M8 v( `1 J+ x( \
                           ;; it is to accelerate or decelerate
; M, }. R4 K$ [- z  phase                    ;; keeps track of the phase/ m- _6 B) E+ c8 P; s+ `1 T
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 J7 o/ }' r+ f3 a
  current-light            ;; the currently selected light0 p% |2 I  {" I6 Y3 a, P

3 Z& G9 x$ r: v9 T( C0 I  ;; patch agentsets
( L6 w+ R# p' r# Y8 u! I! n" {  intersections ;; agentset containing the patches that are intersections! s" q4 ^$ z5 h& I, P, P8 O
  roads         ;; agentset containing the patches that are roads
0 r5 A$ m( j: i. u: k]& h6 X' q% E6 R, B: T

4 o3 N- g8 s  k- C4 n# i) J/ Dturtles-own
5 `1 d, r0 P2 u7 n[
) C& S# Z( k  I; _- s) c) |+ t  speed     ;; the speed of the turtle1 S. U- O$ @" l9 L; u
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
* F% e* W2 G1 I6 P3 z  wait-time ;; the amount of time since the last time a turtle has moved8 @2 R# v* {% j/ u
]  s" o3 c1 Y' Y: L: _

" s( H' y4 {) ]2 z& \3 b$ c( wpatches-own
9 R2 T5 O% Z+ L9 i, R! Z: D7 j[
: `) M  K9 c9 M% w! I6 P/ Y  intersection?   ;; true if the patch is at the intersection of two roads% j$ H; ^4 j* N; A& z
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; B2 L( y5 b, x& I+ D                  ;; false for a non-intersection patches.7 E" h2 a! p* }( {' @1 X
  my-row          ;; the row of the intersection counting from the upper left corner of the3 S& u3 h7 q6 t! Z7 L
                  ;; world.  -1 for non-intersection patches.9 b$ ~" b# o' r$ Y% I
  my-column       ;; the column of the intersection counting from the upper left corner of the7 q( ?  c8 @8 {$ w9 m8 K
                  ;; world.  -1 for non-intersection patches.
3 J- I+ m' q& m+ k6 d0 s1 ^/ @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# v' H4 N' F- P% e" {! ~  auto?           ;; whether or not this intersection will switch automatically.2 v) x* G$ `+ v
                  ;; false for non-intersection patches.
( q: i" h; Z1 W]4 _! A# N& D  v/ C$ p5 `
8 }0 I! d1 J0 {' }, @7 A

% e9 q$ K& j5 {- X; P) J) c;;;;;;;;;;;;;;;;;;;;;;
  x1 J/ E3 `/ H& r6 O  c;; Setup Procedures ;;
! V3 k7 R  N, }; Y;;;;;;;;;;;;;;;;;;;;;;$ Y5 u, @2 |( r$ t- a) \
3 Z* t- O7 p4 _* X% a: {1 A
;; Initialize the display by giving the global and patch variables initial values.7 z6 `* `1 t4 }& [, P* {# J
;; Create num-cars of turtles if there are enough road patches for one turtle to
- z7 h0 c& V5 A4 L5 ?2 a;; be created per road patch. Set up the plots.
! ^3 ~; u6 W' }: W( k. Z& E5 l$ |* pto setup
; u1 O0 u/ i7 r4 R  ca# E! H6 C2 J8 c# W1 `, n8 Y
  setup-globals4 `% @, z) \! i: P8 T  R
' ?' j0 i$ ^# F( j' E2 z
  ;; First we ask the patches to draw themselves and set up a few variables$ L. V. r( t9 P4 W/ C8 Z3 a
  setup-patches
9 M: M8 Q; g# q' u( I  make-current one-of intersections3 n4 h9 P( {; h7 G- _* Y0 E
  label-current
: W9 z. `9 k2 D2 @
9 v/ g2 A& A; S1 [  set-default-shape turtles "car"
* m! v/ {5 ?+ f" n# O6 G" E2 {% E, d& c' P9 a& I
  if (num-cars > count roads)9 y" x$ y- C  L( p  S
  [
$ ^' @3 j7 k& H( h    user-message (word "There are too many cars for the amount of "
3 j. C# a' w) }                       "road.  Either increase the amount of roads "
) E( [# ~. m# D! Y                       "by increasing the GRID-SIZE-X or "
& X  P2 g% S! U  L4 D                       "GRID-SIZE-Y sliders, or decrease the "4 {0 u# {* {. N0 S: e
                       "number of cars by lowering the NUMBER slider.\n"
2 U  f" t& m( J) L8 ^2 ]5 O; @                       "The setup has stopped.")% E( t5 q2 z' K9 v8 ?" j' [4 i% I
    stop! K6 Q. M/ I; s* D- ^  A9 V) T- }
  ]% K: v- a% _) g2 D7 q

! u; o5 T) H& H* f0 {  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, M* c+ v8 |  K- J2 w' m8 T  crt num-cars  B8 g3 F2 d- C) Y: m
  [
5 P5 ]% G. f: n0 F5 J    setup-cars
3 Y2 O9 \2 F+ }* }. Q" d    set-car-color* R/ E) Y  i( v8 U) J
    record-data
( _1 p5 ?+ W3 x  ]$ K0 |! h& a; U. a1 p  P: Q
( f# u! Y7 m: {
  ;; give the turtles an initial speed: _1 O& E7 L2 _* O# t
  ask turtles [ set-car-speed ]2 U$ R5 L$ b/ X

* B% v& b: X: r. F* r& f  reset-ticks
, ]4 h! j( b& Yend/ D+ c1 ?( [8 C) z, }" e; t

% ~" H; a: M9 m( ?! T" u;; Initialize the global variables to appropriate values! I3 z3 \7 x  J* n
to setup-globals
5 @: M" i& z: u! ?, Q  ^$ M  }  set current-light nobody ;; just for now, since there are no lights yet  o/ o( a) Z  Y/ @/ z! d7 R
  set phase 0& }8 E8 N2 E! K* k: O1 u$ T
  set num-cars-stopped 02 w% l4 m! w  ], F& e) K5 s! b
  set grid-x-inc world-width / grid-size-x2 J% |/ a' x! A3 s
  set grid-y-inc world-height / grid-size-y# Q, h2 i; P: f% x1 b/ m

; W: r& r, g! [6 v( _6 Z+ B# m5 x  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ i! @# T5 g* m2 p  L  G  set acceleration 0.099. R' q! v9 V% W, ~" J& y
end
* C1 X* A  E' T8 |. N& c# H7 E9 t# F5 F7 t
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! E- D# k8 X  V% E' n;; and initialize the traffic lights to one setting
& U5 t. m7 z5 @! E0 D8 Oto setup-patches( N6 V" h* F# N+ `5 X7 e; n
  ;; initialize the patch-owned variables and color the patches to a base-color* }4 s* Y' B! R& G( B. d5 f, @
  ask patches
3 |; @; v$ N- U/ }  [
9 W  y* Y# a+ r: o8 D6 g% [    set intersection? false6 n, J# u9 z- _0 c+ m; q( x
    set auto? false+ R, n& }0 l/ U1 `! n! g+ B
    set green-light-up? true
0 M$ b# V3 i& i    set my-row -1
. o# N0 w: k/ f' U7 f, f, R7 u    set my-column -1
2 _2 w) U8 Y* `1 u  q    set my-phase -1
" {2 r  u. Z7 S7 h    set pcolor brown + 3
0 t6 ^, F+ @! Z% X2 a  ]9 {- n- r. [% h1 E6 j6 t

: W# b  V6 V; o3 {6 B* T  ;; initialize the global variables that hold patch agentsets
% k  q! |' }( ]" o: M; _# X  set roads patches with% c8 I  q$ p+ K0 H/ _6 a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 ^. \' F9 S. [) \( f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; Q) B9 N% A3 L4 Q. l6 W3 @' n7 T" I
  set intersections roads with* `6 `6 i0 E4 E. b3 N/ v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) ^$ K) v4 x" J" R8 ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 _8 h+ @, r; j+ x
2 e6 T5 Z8 o. v; A: E7 b+ G
  ask roads [ set pcolor white ]
9 }5 h# U- g* n2 ^    setup-intersections
, P* S; `$ k% b% `9 U! lend
! S% t7 B& ^5 p7 b+ V其中定义道路的句子,如下所示,是什么意思啊?" L) x  v4 a$ Z, W! H
set roads patches with
4 M* V7 S  L5 S3 e: @8 l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( @( s& H' D& i! [# `1 H5 e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! _2 K" _5 D- q& n
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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