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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。
- M3 ^- g( ]3 n- q8 r8 Wnetlogo自带的social science--traffic grid这一例子当中,
9 x( H& b" z9 \# r2 {7 \- tglobals$ a2 T+ N6 B$ j
[
5 t% k' j5 u  b6 l3 T9 ?  grid-x-inc               ;; the amount of patches in between two roads in the x direction* V$ T* S' U0 z1 I2 ]
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
; l/ j( U" E4 _" ]9 l* t  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
1 N" @% ~( C$ U8 ^                           ;; it is to accelerate or decelerate
6 R$ ]5 J9 B0 N5 K# E% V  phase                    ;; keeps track of the phase9 k; ~" N! q! Z8 {% ]* b, Z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 P) Z8 U5 Q; Y7 U0 l  current-light            ;; the currently selected light& r' j! y) Z& t

1 q4 p5 E, n7 T. Q  ;; patch agentsets: ?# t+ z4 h, v1 \8 O  C7 |0 a
  intersections ;; agentset containing the patches that are intersections" ]1 {5 O( I& X
  roads         ;; agentset containing the patches that are roads
: W6 F0 ]/ x/ J2 {]4 _- V+ L+ R+ t$ B5 X8 V3 U3 w

, y/ n0 p! g$ n# e+ bturtles-own" O, z9 k/ l; Z5 D( @' Y
[
& L8 d" |' k4 X8 C. }  speed     ;; the speed of the turtle% P4 w' {: U) c
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right# `8 w6 h: R/ E0 w4 P  b7 I
  wait-time ;; the amount of time since the last time a turtle has moved
* E6 [' ]  X4 ?3 c' @: y) b]" p6 F4 b! a9 Q. F
, c- c- I+ D$ z
patches-own
- X& m; R7 }: n) r/ J. Y) d[
. b" C# W/ c' `  |$ l  intersection?   ;; true if the patch is at the intersection of two roads
7 Z( N9 b0 H2 J" R  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# ^  y4 D8 U' O
                  ;; false for a non-intersection patches.0 H- g: |5 }3 K* u/ b4 [% Q
  my-row          ;; the row of the intersection counting from the upper left corner of the) x& A' K& l1 a: @# ~0 F# P3 N
                  ;; world.  -1 for non-intersection patches.
& Y. B% [3 y2 {1 w  my-column       ;; the column of the intersection counting from the upper left corner of the' f* N, Z$ Q7 ~2 M9 D0 l
                  ;; world.  -1 for non-intersection patches.
+ u- m# r# g- D9 W2 i7 C9 x  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.1 {, J* |- f2 W
  auto?           ;; whether or not this intersection will switch automatically.
% q7 D! O4 U/ [& e. V& e2 q/ {                  ;; false for non-intersection patches.
& w9 v. f) M( z' {# d]
6 l, v* g: u0 B/ I0 @: F4 T1 ?: A* G  i" e4 f' Y

6 [' r8 Q$ ?5 f) H* w" V;;;;;;;;;;;;;;;;;;;;;;
: c4 V4 G6 U$ U# j. U;; Setup Procedures ;;. \7 \* ?  N- }; a+ w; O
;;;;;;;;;;;;;;;;;;;;;;
% I( R1 \8 d$ h0 T& ~1 y$ r. d
- t5 @& e7 B  U: d. X;; Initialize the display by giving the global and patch variables initial values.
; T3 Y& Q. H5 _5 e7 d;; Create num-cars of turtles if there are enough road patches for one turtle to
2 ], ?! B, [# g;; be created per road patch. Set up the plots.. e) j  z& l; D( u, G
to setup0 X- T) z* Y: i8 k- j+ W
  ca  G0 Y: P7 i: N
  setup-globals
: [( T2 a  _: G$ n8 ~
/ B. Q& C' d/ l* r5 a  ;; First we ask the patches to draw themselves and set up a few variables
) K* |# ^/ W0 k  I& f  setup-patches0 D4 i+ n" f; X  b- _5 v# I# ^
  make-current one-of intersections
( e! f! O1 I4 A, P  l* O  label-current
* b! z  T$ V/ x$ e1 N& |- q
0 d8 U4 D; g5 {' S  y  set-default-shape turtles "car"3 Q" s5 \+ W. y5 i

$ Z; }' X: O0 Z4 r, g9 D  if (num-cars > count roads)# x& |/ `, _4 F
  [# S& C4 X. N9 |' B- T  W# S- g
    user-message (word "There are too many cars for the amount of "
/ d6 P) U; B6 a. m! l7 U- f, k& V                       "road.  Either increase the amount of roads "
  m" k  p, @( l/ K2 y                       "by increasing the GRID-SIZE-X or "8 e# }- |) e1 h4 o, B% i
                       "GRID-SIZE-Y sliders, or decrease the "5 u0 ]6 q0 {7 d+ c
                       "number of cars by lowering the NUMBER slider.\n"
/ a$ I1 h! _4 S                       "The setup has stopped.")/ A; G7 i# W' ?
    stop
' ]* y0 W4 i& C+ L7 g$ Q7 d  ]
; d" G% ^/ Q; t" a4 Z+ w! W' [$ u0 `1 _5 @: e8 y! ^" I9 Z0 o' i
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ {7 w' a2 o/ R5 P  crt num-cars1 K) K! R8 d+ D+ s
  [  H# ?7 V: y% P. Q
    setup-cars1 h, X* n9 ^) o1 A5 n9 `7 f; |
    set-car-color  Q7 ^# s+ U( a' O( @8 m/ h
    record-data
4 A2 B' f! [: H4 H' \: N  ]
5 Z0 c; I& w; l3 A
" ?  ^7 e4 q9 _# P3 V" o" ^  ;; give the turtles an initial speed* i. `' |- Z: V7 b3 B
  ask turtles [ set-car-speed ]5 ~: j  Q9 x0 H, K$ Y: d8 V2 {
; E# [( M7 Y5 x( H1 [  Z& b0 {# C! \
  reset-ticks
' }$ S( Y( [( K7 i: l+ J1 h! r( D- fend
* ?: q! \4 X; z$ H. b1 i4 R, w
* O% H9 q( B' O9 N: P;; Initialize the global variables to appropriate values
! C% r" l; h0 }' x# tto setup-globals
7 c" T3 }) h3 A8 g, \/ e: l0 D  set current-light nobody ;; just for now, since there are no lights yet) M4 r+ C+ {. w6 }# X
  set phase 0! W# N3 D% D& ]
  set num-cars-stopped 0
1 l& L2 D+ m1 `! T* r3 d( e  set grid-x-inc world-width / grid-size-x
- A3 L% D$ ~. U* T  s) h  }  set grid-y-inc world-height / grid-size-y
+ N3 J6 f3 ?; t' C( b# Y$ c. n4 g7 m5 M5 W* T, X/ \& ~
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* @+ l2 O$ K; h) Q0 B' b! I
  set acceleration 0.099- \+ @8 r1 w2 X& L+ P
end
: k% Y% I) m5 h& w, @
  c" p9 d5 v8 R# |% b1 H;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 Q& ?6 E# l' m9 A& I* z, n
;; and initialize the traffic lights to one setting, K# s( z6 a8 X5 o( S7 e/ q7 x+ V7 u
to setup-patches) j! {8 ^7 q% F) r
  ;; initialize the patch-owned variables and color the patches to a base-color" X) E: p2 t- z' ?4 O% s
  ask patches
$ K! Q$ y. S+ f& F3 Q  U+ |3 ^5 t* L3 B  [2 u; }& n$ Y; [
    set intersection? false( k) E, n# c' R0 k! y
    set auto? false
2 X% S$ M; ?( X0 R: ?- G. c" V2 `# b    set green-light-up? true
6 Q# b, w, |( c6 R0 `! q7 Y    set my-row -1
, B& E& m% R3 z! ~    set my-column -1) v8 ^% L2 u- S/ \0 G( Y
    set my-phase -1
' V9 {$ A5 K( O7 @7 ]    set pcolor brown + 3
2 K% s/ }, ]( ]  ]0 n: e# F0 A# p) h! W' {

$ i' X# I6 t* l: y; D5 G  ;; initialize the global variables that hold patch agentsets* A7 R' p2 h# ?" ?
  set roads patches with. W# ~7 n) }$ v1 N4 _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' S* _8 Q+ \0 D. j( ^, v( E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* `+ k9 p5 N) V" t* G  set intersections roads with
& h7 T0 v$ U" H5 M; _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ ]9 b; X) \% x6 n5 f. L9 z) N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) A% _! q3 Q. S: r6 ~
. F- j0 J  ?. Y7 P7 B9 [  ask roads [ set pcolor white ]) E: @- B% L: t+ L
    setup-intersections1 v+ M  L; M7 P7 i7 S1 y+ P# k
end
8 s2 b/ k0 M4 C* z其中定义道路的句子,如下所示,是什么意思啊?" u/ C, C1 t" Y* s2 N
set roads patches with
( G! [. ]% ?. I) ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; [# T9 b, ~5 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 |5 K( m' ]" a" i% q% Q1 ]
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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