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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。
# h9 Z5 x9 n+ l; R8 N& u& tnetlogo自带的social science--traffic grid这一例子当中,
! ^; }8 e  h& P! w8 ^globals
" L; n. h! M% J! t& g9 L[  i% z; |! X8 p: z
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
' c0 J% R6 w* w3 O/ p  grid-y-inc               ;; the amount of patches in between two roads in the y direction
3 U6 b! J0 @7 p8 Z( l6 G' R  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
8 C3 h+ b- k7 ?                           ;; it is to accelerate or decelerate
% p- F& e9 g  L$ ~& V: y  phase                    ;; keeps track of the phase
3 |$ M8 ~; j9 w( t7 B1 @& }! f  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
+ }6 W* f2 m/ ?9 t7 p& X  current-light            ;; the currently selected light* |' S1 E5 M: O/ ^9 q' e- a
9 U  B2 p4 W6 q$ m4 W( n' d8 j
  ;; patch agentsets
% c4 @3 Y0 w2 m9 H9 H% Y- Q( j  intersections ;; agentset containing the patches that are intersections9 w) r% H' u9 A$ x. E: o3 b" K
  roads         ;; agentset containing the patches that are roads+ x& }1 \* s) }+ ?: b
]0 [" T8 X; n+ s/ \
  f2 ^; E" {- Q" ]3 ?& g8 s/ m
turtles-own
4 z" e3 t2 A; }; i/ ~" n[
8 C  H. Z0 E' c# Y. k, [  speed     ;; the speed of the turtle
4 p5 s2 x* a% A; r  up-car?   ;; true if the turtle moves downwards and false if it moves to the right# \. h* S* G' M5 g% Q4 `* E
  wait-time ;; the amount of time since the last time a turtle has moved# w$ E( l) {* r( d
]+ ?$ F% }0 K& a( W% T% j  n

" l' O5 S2 s/ M! S  Hpatches-own
( {/ D5 h0 L$ p! q' l& i* b[
. X8 P7 h6 h1 d- ?' ^: V7 L  intersection?   ;; true if the patch is at the intersection of two roads% N$ _. n% w& y3 u  B6 h( f7 ]6 C
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
1 C1 @# {/ }9 W. U' J* }% |" r5 r                  ;; false for a non-intersection patches.( ]# ~/ i; S" f7 Q1 L/ O& A
  my-row          ;; the row of the intersection counting from the upper left corner of the
0 @- t" v4 \: u7 _: V% m                  ;; world.  -1 for non-intersection patches.1 Y5 @5 n5 |0 V& ?" P
  my-column       ;; the column of the intersection counting from the upper left corner of the
/ l9 V. C  b2 R                  ;; world.  -1 for non-intersection patches.
  f7 W  w5 q2 y* j" X; R$ x  k$ g  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.$ |& t6 ^" V2 m2 A
  auto?           ;; whether or not this intersection will switch automatically.1 V) q2 M- U7 R* X8 R0 d/ C
                  ;; false for non-intersection patches.
( x9 y" p" H5 G8 E: K]$ `: s7 c) [; T( J

. t( ~6 E& E$ R* l7 s3 ^$ K: \# }( Y! s+ `4 q! g# r
;;;;;;;;;;;;;;;;;;;;;;2 g8 E" |7 a7 y' {+ Q# E
;; Setup Procedures ;;
% Q  G8 ?) S1 O2 s* j;;;;;;;;;;;;;;;;;;;;;;& W( O! K1 l2 k5 k/ f

: J. O0 P7 \& U5 q3 y' ~;; Initialize the display by giving the global and patch variables initial values.: m* @  V! e: \
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 r) L( A+ q# S: W- b;; be created per road patch. Set up the plots.! i9 [% y9 @  A. e" w4 s
to setup9 D- E! _9 M: k2 U- P  ]( a* N$ v% I
  ca
" C$ i+ a; [6 P$ r  setup-globals
4 t' `" l: h* Y* i2 ?% {- y( `
7 D8 c9 c1 M0 d! L6 T( l  ;; First we ask the patches to draw themselves and set up a few variables( q" ?7 }% ~/ S1 e7 ~
  setup-patches2 {- x# u) z" E( @- F
  make-current one-of intersections4 I8 a' Z" ]# Z& c1 s5 u
  label-current- O5 X# C! ^9 B

* o5 e6 N: f& M4 F% l! Q  set-default-shape turtles "car"
8 p+ M0 \, i* s: P9 y8 w% x, Q
5 G: |4 ~  }9 X* o- h  if (num-cars > count roads). y/ O) n) v9 c) N# y8 W
  [
+ \$ h% O* A4 i    user-message (word "There are too many cars for the amount of "
" ~; o+ w+ Z& Y9 y                       "road.  Either increase the amount of roads "3 v( P/ J/ b3 E: r9 [! W- `
                       "by increasing the GRID-SIZE-X or "# \. V; Q6 n9 ?  F
                       "GRID-SIZE-Y sliders, or decrease the "
1 N# u; I+ ^" `7 r5 @/ F/ J                       "number of cars by lowering the NUMBER slider.\n"
7 `$ F" H% `! X" t                       "The setup has stopped.")
) C3 c  ]( c9 V2 ]5 w; g+ g. k    stop
& o8 B* A" j: v1 ?4 v  ]
4 L( Z: O' ?0 }
: m* F- w' Z) K& m' p- ~& ^8 K. Z  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 V* x5 |: X* }: u  crt num-cars
, @0 K6 x0 {" z' M' j  [
* x4 n. ]9 h  e% e. o% ?7 A    setup-cars. m; G, K- T7 J( t/ H. z- P4 R
    set-car-color* Y: |" ?0 _, n: r1 S
    record-data8 ~" _0 f8 A. d/ Y6 f9 r7 a. z3 ~7 {
  ]" G4 ?" }  @9 O9 n

7 c- z" p( \5 O! \' b  ;; give the turtles an initial speed
/ v* ~# @, x) Q. Q9 k  ask turtles [ set-car-speed ]
1 s7 a3 @4 [/ N
: x6 r/ E' P6 `% \2 Q" j  reset-ticks4 A2 u$ A, S2 q7 l  K$ M% j2 {- {+ i
end) G* c  f% a0 H

, ]6 x% k' Q4 c% c8 [  j& v; _;; Initialize the global variables to appropriate values
( a* U. j) f1 Ato setup-globals
/ B, V4 |1 T3 n2 b+ v* F  set current-light nobody ;; just for now, since there are no lights yet
% K( H4 o+ x' m  set phase 0
. Z9 M; b1 F/ b9 U) S  set num-cars-stopped 0( d' m! k  |+ q2 O) p. h% @$ T
  set grid-x-inc world-width / grid-size-x; I% z4 N* t& \; O6 O  j% h3 c
  set grid-y-inc world-height / grid-size-y$ j8 R: a& E- Q! R& B2 ?* e# V
2 z& ^& N1 E6 i' L, _( q) P1 {
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, k- U7 q# i( j; T  set acceleration 0.099# }1 u( q- ]# n# e+ T7 f
end
  U, [5 g0 i1 @+ Q! {4 h5 C" R; B. I4 Y2 h
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ j' W1 Y' i& i8 A
;; and initialize the traffic lights to one setting
0 g) G+ P8 E' V( B0 D4 Y5 z5 c/ i- kto setup-patches
8 O9 m6 n8 s; f* q3 g( A' v2 ^" ~  [  ;; initialize the patch-owned variables and color the patches to a base-color
( B. k  I3 p/ O, V% p4 Q, t  ask patches
4 q5 n4 W, Z+ g' E  [8 V. B/ I  h/ o1 Q. j
    set intersection? false% j1 M# _( V4 g2 w! o3 h7 m+ B
    set auto? false+ w7 l, n4 B7 R4 e# n: M% w9 r
    set green-light-up? true( a: L7 U1 h: W
    set my-row -1
$ `! `# |5 J; |4 I9 s    set my-column -15 k( l- P* S- y$ ]
    set my-phase -1
5 k3 N7 H+ v7 x- l    set pcolor brown + 3
6 }# N) d% p* c9 n- Z8 [# Y  ]; A5 t! x" e( \5 |

  D6 V! O3 s- g5 @8 q  ;; initialize the global variables that hold patch agentsets) a, U) s2 D' B; t; x$ D$ k
  set roads patches with! M, ?6 T& U- H; `) y7 r2 n0 C; C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; h# z  |, I3 x) L& p- X. D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 g0 R7 d3 ]$ N  set intersections roads with
7 B$ x+ [1 |. i# \$ `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' T! y- k: T) O) }+ C- G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 |, b: z* s6 L- {# @/ h% P! G- ]7 ~
  ask roads [ set pcolor white ]0 j+ c' Y$ ~+ N% g7 v1 R
    setup-intersections% F3 P/ O# Z- D# I, y
end
0 R3 y" S8 {7 H  f9 J3 B* Q9 W其中定义道路的句子,如下所示,是什么意思啊?& G  t2 g/ e) B4 R6 S/ I
set roads patches with
# j% c( D+ p/ }4 f% x% P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 O6 r- Z2 \  ?1 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' w. |( J' P6 W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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