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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。
) ]6 A! H( C, u9 L7 y2 ~( Rnetlogo自带的social science--traffic grid这一例子当中,) \" b* a! L1 U7 h5 H6 w
globals5 `4 y) T: z" y5 J
[( X' D+ R3 j2 @1 ~
  grid-x-inc               ;; the amount of patches in between two roads in the x direction: j1 J0 e5 y3 H* T* Y8 K5 r( S6 b$ ~
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
7 R- d9 ~* {$ q  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' `) y, N  r1 c3 h+ L
                           ;; it is to accelerate or decelerate
( o/ Y4 t" k' I9 m: a  phase                    ;; keeps track of the phase2 @- ]! V! R! V) I$ b& j8 {* g: R
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure' i) r" h- B) u7 U5 t$ Q
  current-light            ;; the currently selected light
0 f: p" ^3 e+ Q! _6 y% F! l
) c4 u; ], L( h  ;; patch agentsets
! ?& G7 A" e9 F" l4 I) Z* x  intersections ;; agentset containing the patches that are intersections7 ?: y, ?* I+ k: z# n$ T9 F
  roads         ;; agentset containing the patches that are roads5 p7 M# i+ K$ K& I) `1 u
]
: j$ @0 {4 e" V% ^2 a6 U" A
5 j) {4 m: e$ V" h& {/ j3 m9 yturtles-own
2 ?- D5 J. s% R+ j; H1 W) i3 c[& H2 v9 j$ K' w. `4 Q0 E+ R) T' u
  speed     ;; the speed of the turtle
( b, i* i8 `, `9 y0 z! Y  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; \, q- L- R: K" c+ }& q  wait-time ;; the amount of time since the last time a turtle has moved/ b( |) N, ]  @% z' J
]
  u! U+ A# n9 \+ `" G" X
' }4 p; F3 ^2 g. Rpatches-own
' g# B6 z; L0 y4 f% W[6 f! p# ^3 ^$ I& w6 d. v+ ~( V
  intersection?   ;; true if the patch is at the intersection of two roads7 O. r" M4 E" o6 h& R5 u
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.0 }1 Q  I& L; L* }8 B+ }( }
                  ;; false for a non-intersection patches.: G* o4 v: |; H0 @; \" i
  my-row          ;; the row of the intersection counting from the upper left corner of the. N) Y; o' k+ S" [; ~4 @3 K
                  ;; world.  -1 for non-intersection patches.
1 X! j8 I8 D8 x+ A5 z2 m  my-column       ;; the column of the intersection counting from the upper left corner of the4 ]) r4 u8 w; A* c
                  ;; world.  -1 for non-intersection patches.8 M4 T( U! x2 {- }7 |+ b' ^
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
9 N& o( ?5 M) ?, G# l% B  auto?           ;; whether or not this intersection will switch automatically.- j: Z& r8 x- k3 s9 H
                  ;; false for non-intersection patches.
0 R5 L2 T6 n+ S+ `6 M2 E]8 |  w! Z$ c0 p& Q, ^9 |
7 t) M+ I4 g$ b$ T4 H& o( X, I( g' `2 Y
/ m* `4 n* c1 e( ?) v
;;;;;;;;;;;;;;;;;;;;;;) i. o" ?: z; Q$ w9 s3 [
;; Setup Procedures ;;- m2 O- Y8 f' T4 [; |0 b& t/ f
;;;;;;;;;;;;;;;;;;;;;;9 j) R5 Y5 x  ]9 e

# l  q$ D1 R6 M3 {;; Initialize the display by giving the global and patch variables initial values.) y3 ?3 s; ~! @  K
;; Create num-cars of turtles if there are enough road patches for one turtle to+ N% A+ M! K, @$ W  L
;; be created per road patch. Set up the plots.7 G, b; W9 E$ S+ E( W' y* U0 \# ]7 M
to setup
1 ?& \( [+ [0 E1 ], q, c+ |+ q! M- e  ca
. A1 Q2 B8 C, A1 o1 G  setup-globals
3 I% q# o1 j$ [! n; H- ~
  T5 b  w+ e1 l  ;; First we ask the patches to draw themselves and set up a few variables' Q) F9 h  Y  X7 f, e# y
  setup-patches6 G  q; F( A0 h
  make-current one-of intersections
  _- k6 a& a3 r# h& L0 v( T$ r/ ^' f( V. l  label-current5 `6 W5 y7 _$ }8 }
  R  Q! Q; A) l5 l- z% H% z5 f
  set-default-shape turtles "car"3 d3 {) Z! h8 [. X( d
- \6 I" G8 W  u$ @) I1 ]; _( B. [
  if (num-cars > count roads)2 V/ D% {. [  h0 i3 T& Q0 ?
  [
- \3 p7 C- Z$ U* B2 P* Z5 t6 C    user-message (word "There are too many cars for the amount of "% _8 q% C3 w2 |5 e( f
                       "road.  Either increase the amount of roads "5 B8 }) B8 W) {' H
                       "by increasing the GRID-SIZE-X or "
4 K1 p7 ?4 u- Z5 x                       "GRID-SIZE-Y sliders, or decrease the "; D6 s, p, |- x: O* B! ~
                       "number of cars by lowering the NUMBER slider.\n"
6 d) }0 z/ a+ F; w0 e/ y                       "The setup has stopped.")
7 u- C4 V: F& A$ W    stop0 e& g: d- s: ]1 Z3 ^5 F2 q8 R
  ]
; M0 d/ _* X0 K' A) \+ T! j9 U) ~' z' m7 {8 P. o5 G- v7 @8 m
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 ~) B# t8 t4 R6 Q8 S  crt num-cars
8 l( k( ]4 x* o% l; F; F  [
. L& |( f$ t7 j$ u2 ]    setup-cars
" P+ q' N2 ]2 u* |. z, M9 x    set-car-color6 r" B1 }+ J$ ^5 N! }
    record-data9 }7 L  b2 Z) H
  ]$ W" q, T8 p& k  v( _4 s! u

; J! L2 Y5 k! [' C- I' v  ;; give the turtles an initial speed
& U7 w0 V: `2 |  ask turtles [ set-car-speed ]
3 ^9 ]; y0 e. a* u
; q: ~6 g5 x' V6 Z' X, x. d  reset-ticks
, O- p% m: f" u/ R- x0 c8 b! Send% X3 Y) }' h- y& d6 Z

( e$ q  R- i0 O+ m; V;; Initialize the global variables to appropriate values) L: h- i- W5 j  f0 N0 r
to setup-globals8 x: @2 |" e& B( h( C9 r
  set current-light nobody ;; just for now, since there are no lights yet7 g/ k. z* S2 h! P
  set phase 0/ J# O9 i! e$ p/ `+ [
  set num-cars-stopped 0' `9 i, m/ `3 f* z9 j# J
  set grid-x-inc world-width / grid-size-x2 L6 X6 k( ^( y2 W
  set grid-y-inc world-height / grid-size-y
/ J: N4 S4 x% f1 l8 a
* n) b; s  V$ E* g. F7 r  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 q0 `7 ^( j) ~8 s
  set acceleration 0.099+ C; N  w3 C9 ]! O7 z
end
) d+ d$ s5 j, p5 f* V. `9 {6 |6 y2 R$ P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* j; ^3 o$ }0 `0 @9 O' o
;; and initialize the traffic lights to one setting# m$ ^, t0 H( L' P
to setup-patches
' W+ h: ?7 f; r$ y+ q; L  ;; initialize the patch-owned variables and color the patches to a base-color
' f& s' i5 K, d3 q! O% @# B" U' u  ask patches; N# q8 N1 e( C
  [; l" ~, }+ y$ k( ~$ j& f
    set intersection? false
" u/ k- e. b/ l. B' O5 A  S6 z    set auto? false/ L( g1 d# M% x1 f5 a
    set green-light-up? true& @3 E+ S, j+ J  _. C  L
    set my-row -1, O1 z& T2 \& u
    set my-column -16 \. Q: [% Z) `0 a
    set my-phase -1* Q+ ^- o9 T6 s8 B3 e% ?0 d
    set pcolor brown + 31 j) e9 e& y7 v. ]* k* {. q5 O
  ]
, Q0 g  F1 d1 H, O6 o/ o
2 Q) F2 r6 `& x. s* T  ;; initialize the global variables that hold patch agentsets* `8 u- z) p3 i5 J7 }* k% Y5 y
  set roads patches with1 C" ^/ J* Q) F4 }" L3 m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 y* v' o+ \) i3 P, R% M# p. H
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 b8 ^. i' u$ G7 w9 ?9 J- V, E" k  set intersections roads with7 m; a6 U: f! L& K, U4 V3 V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ _$ q  ]$ b! q  J! J" d
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: P* `' U. w+ T4 X" u; G: J6 c3 f
. d! q$ \9 ~' X9 R- u& n  ask roads [ set pcolor white ]3 F+ S% @: a8 L5 H
    setup-intersections
; i+ t9 ^+ I1 ]end
: Z1 F4 d2 N* f3 Q  ]: {6 V其中定义道路的句子,如下所示,是什么意思啊?" k$ d  B; L3 ?; ^
set roads patches with' q" Z! y9 z9 V3 X: J, X3 y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" T' H6 n; a5 ]& C& Y9 U/ o( G* `    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 z1 F0 z7 r- d% h9 ]2 e/ C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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