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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。; K9 k$ G. h3 ]1 K  v% I
netlogo自带的social science--traffic grid这一例子当中,- `, j. k2 m; p8 m) o9 t$ ]
globals
; v3 o5 h7 t# T; j[: H3 W* E1 t5 o1 s0 m6 r  O
  grid-x-inc               ;; the amount of patches in between two roads in the x direction: o$ e, e7 X1 K
  grid-y-inc               ;; the amount of patches in between two roads in the y direction) Y, L9 D' D: Y! C% ]1 }! y7 i
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 `0 O6 c" |2 a5 T* \1 T' |5 }                           ;; it is to accelerate or decelerate5 V5 p: h( b) w- m: Z9 u
  phase                    ;; keeps track of the phase
$ T5 D* ~; ^0 `8 C3 E2 u  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 U. L$ o7 [9 Y7 ]
  current-light            ;; the currently selected light; Z+ D+ v/ O" Q2 s) a% H% V" R  S
/ V+ m: u6 i. b+ j, F
  ;; patch agentsets
7 z$ N  P( H( \5 H  intersections ;; agentset containing the patches that are intersections
$ v$ M: t2 j) K# W* W1 B  roads         ;; agentset containing the patches that are roads
) k! E3 R/ k! B# l. C: y]" m1 C7 a2 E0 v8 A3 b* c8 ?

* d' w9 k+ S2 T+ J, Oturtles-own
5 v# K* B2 [" R1 E% I" S6 w[
9 h8 `; I4 i2 d  speed     ;; the speed of the turtle0 c& \% @5 F# V9 h0 i( ^
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 m8 h8 v) y- s4 P+ R
  wait-time ;; the amount of time since the last time a turtle has moved
) ]' h' L( N& X' W, x2 h; k]0 T7 y2 p7 V9 w6 t

2 D$ R$ A1 h+ d- wpatches-own! I  M% O2 p4 y6 n
[
4 {- K4 {/ [9 O4 m  intersection?   ;; true if the patch is at the intersection of two roads
- c; J- |8 v! w* r6 s  ]) t# w  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.0 i: b8 l9 F* s, Z4 ~) V3 q) c* m
                  ;; false for a non-intersection patches.
0 d9 C( B# N. {7 ^$ M; U" L  my-row          ;; the row of the intersection counting from the upper left corner of the0 q# F$ A7 w% K1 ~2 x4 z
                  ;; world.  -1 for non-intersection patches.8 B% {  z  e6 m. e% p
  my-column       ;; the column of the intersection counting from the upper left corner of the8 B+ I) [1 Q& H, g
                  ;; world.  -1 for non-intersection patches.2 H& O) U( Q! P* c* W1 G, [
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. h# E5 W6 u9 I9 d# [; _  auto?           ;; whether or not this intersection will switch automatically.
) m8 w- l. ]) x' T% K6 e6 V                  ;; false for non-intersection patches." m( ]  c* e3 P
]! o$ o& J0 R# E( F
4 u9 ]5 b' }! l
# X  b- ?) p) t1 q& y' ?
;;;;;;;;;;;;;;;;;;;;;;0 G9 @$ o' Q! o, ^$ S
;; Setup Procedures ;;
( o+ B* w# Q  O. u;;;;;;;;;;;;;;;;;;;;;;7 ~; l9 L3 N4 p5 ~2 k& r
: G! N7 d8 o# b1 D; @
;; Initialize the display by giving the global and patch variables initial values.: D' r5 x1 B/ j5 h8 J" a
;; Create num-cars of turtles if there are enough road patches for one turtle to
& F: x9 V, M% k/ r% |2 B;; be created per road patch. Set up the plots.
! ^+ p; F9 [& s1 D  x5 V* Sto setup
" }, ]8 `& Z- h% b# V7 \  ca
2 }/ B+ n) g7 }6 e4 K  setup-globals
  Z/ a$ |8 P/ {* Z# W: J  ]
/ W$ c- K4 q! w" Q, U7 p  ;; First we ask the patches to draw themselves and set up a few variables
; w2 P" f: }5 C9 a- Q( Z* z& z0 `  setup-patches
# {& i/ r! }/ O) R+ F0 A  make-current one-of intersections6 ?3 O: e+ [1 M; B2 v8 j
  label-current" h6 v; D, g4 q5 J# m7 T

( k9 G% _( U) Q/ c* f  set-default-shape turtles "car"! q+ N0 }7 K0 ?! Y

8 J. r! x. q5 B2 O2 y' N  ~  if (num-cars > count roads)5 y$ d- J4 s* C" ~$ }8 J) G
  [0 p" O+ t4 x' f& W& ^4 ^% r
    user-message (word "There are too many cars for the amount of "0 o7 u/ U1 b3 g! e- q% J$ U9 }( |
                       "road.  Either increase the amount of roads "
5 a0 c- k( |1 T1 I6 J                       "by increasing the GRID-SIZE-X or "
. H" w0 S0 u& R1 z. x' f) m                       "GRID-SIZE-Y sliders, or decrease the "
4 {4 O  R/ y3 l1 U6 E                       "number of cars by lowering the NUMBER slider.\n"
3 E, K, s2 E3 B' ~  ^! z                       "The setup has stopped.")
, y3 m7 H2 B- o; v$ \3 ^- {: Y: v    stop
0 B8 j3 R: ?/ [/ \. E! q, W# T  ]
9 M' W% Y" A" E1 p9 f+ ^2 M7 n$ H- }
4 j7 ?* v& N1 y& Q& l" B  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 u! b; l3 ^% L+ V9 B  crt num-cars
6 R8 n/ ]# c' @  ^  [4 }( h, ^" Q: O1 U4 I
    setup-cars
9 x  l3 P" l6 A+ _    set-car-color' A8 Y3 u0 F0 O; ?( B* [, }1 D9 F
    record-data8 g% }" C( m6 i8 R( u! T) x9 N
  ]
0 K3 P& ]. \9 A5 P/ e
1 ?: u: c! `( z! c. B  ;; give the turtles an initial speed. ]. n& l( L  h0 J9 u* X
  ask turtles [ set-car-speed ]
6 I" S; V* Y% `' b* d  {
" h# X6 w2 ^3 L& p3 B4 G! v" `, H, Q* ]  reset-ticks
9 O; }: A$ U3 o9 C; p  Iend
1 t8 f0 |% B; F( t% j
; U! W2 U9 g$ `$ N$ G: d* g3 m;; Initialize the global variables to appropriate values
; ~$ x: p+ R, A/ \: T0 mto setup-globals
+ W7 a7 D0 \2 H, E) j  set current-light nobody ;; just for now, since there are no lights yet0 G2 {+ d' r; W" H' V
  set phase 0
2 j; Y4 z1 O; ?0 L' l, _% d# B  set num-cars-stopped 0
- D  P- q% D8 ~" T' h  set grid-x-inc world-width / grid-size-x
# k! \, l8 S8 f) V- h+ S' j! q. F0 Q  set grid-y-inc world-height / grid-size-y% Y. y" G0 J0 f/ o

% e8 I/ D- o6 I# @! ~: k6 A9 u  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" F! u0 [% w9 Y5 K) p# n
  set acceleration 0.099
1 j% F2 ?2 n$ h) ^$ B4 n* _" Tend
/ v5 r) d' m) i1 m7 S; o( h' A1 A2 Z+ l/ ]- Q; n( p
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,3 X9 J& K' Z. b0 G
;; and initialize the traffic lights to one setting
3 b0 K( x% l0 y. yto setup-patches
) |5 f( x) `: p6 R" |& @; Q  ;; initialize the patch-owned variables and color the patches to a base-color
2 Q6 g4 x5 u& ~+ \  ask patches6 f+ P8 C! W' o; {
  [0 `% w) U( d. k- P: K
    set intersection? false
3 V3 D% U( Q: {5 }' o    set auto? false+ Y2 L3 ]) k) \! i0 h& Z) m
    set green-light-up? true' {2 D8 Y9 a" P' ?2 n
    set my-row -1
7 H7 n- |7 }7 }, p6 V1 x    set my-column -1
9 w- I9 O6 Q1 ~; J" |    set my-phase -19 G. ]! U2 {( p: v
    set pcolor brown + 3$ r; R$ M8 k6 e2 S2 d  c, {1 T
  ]# q) ?6 t2 [9 o0 _

/ b1 C9 N1 A: r8 e% N  ;; initialize the global variables that hold patch agentsets& X( I$ N# j% m& O* F% B' E, {" B
  set roads patches with
4 X# k6 l% ^: h/ }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 K$ G2 q  I$ b  W' F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 E* p( H( p) D) v( x6 L. D7 R! C  set intersections roads with/ ^6 Z- u6 T7 E$ U( g' R7 u9 V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! {; O% p6 z) X- I3 q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 D% c& @3 o4 X, ^( i
. i6 Y3 j- g* m, a. G  w8 {5 V) N/ D  ask roads [ set pcolor white ]
( c  F3 S) s( P" O7 d    setup-intersections) h1 {+ S( ?, N
end
4 B9 l# V, U9 F7 Y其中定义道路的句子,如下所示,是什么意思啊?- O) E  @6 p7 [$ {5 b
set roads patches with
9 M2 J5 W5 @3 v% T* u1 b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 ^) {* P; C7 F/ c2 u& R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ P5 z0 C! A$ T5 d$ G$ h! q  t  O
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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