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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。
  X! t3 j* o; ]6 _netlogo自带的social science--traffic grid这一例子当中,
- P! `2 j% g) y4 n& r6 P/ uglobals
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  grid-x-inc               ;; the amount of patches in between two roads in the x direction5 P- Y+ ~% l) @& S* i, Z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' \) _% E3 Z5 \3 C( [8 O( r2 |  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 @; X. V' _* W: ^9 g2 k  q& b: R                           ;; it is to accelerate or decelerate- t" q  S) o( W. W* m# u# }
  phase                    ;; keeps track of the phase
+ W# ^5 A1 x$ b0 H# c  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure" z- A$ ~+ W9 c5 I2 X* S
  current-light            ;; the currently selected light
! B/ K4 V; }8 E' Y, {6 b# c3 v+ F( q# S
  ;; patch agentsets
: o+ v2 y( C( p2 s  intersections ;; agentset containing the patches that are intersections
7 X4 S2 K0 S) u6 _8 E  roads         ;; agentset containing the patches that are roads& U4 A" x! b' p
]
9 l  B+ ?7 c3 y0 c! v- u+ p8 i+ s0 x9 K  j0 N/ s& d+ y9 P1 E
turtles-own
  O& S/ I; d/ M9 j[
& w* j: |- x* F* \' V; y5 K6 G& h  speed     ;; the speed of the turtle' }) A3 O# w& k
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
" |  {. A9 r0 V7 v3 S  wait-time ;; the amount of time since the last time a turtle has moved( f( Z1 D' E. n, F! W6 F
]  ]3 B5 T+ V- o' N; R7 O8 P
. E# Y) }* z" i1 g* g9 K
patches-own
# [  f( ~8 H2 W[, W, _* a0 |. W- f  c
  intersection?   ;; true if the patch is at the intersection of two roads
) h; v, ^0 f: o7 j: r  d  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.) {) ~+ D" m0 p7 L4 `& m0 n$ J
                  ;; false for a non-intersection patches.
; S  t: r1 {! o. b7 w) ?# x  my-row          ;; the row of the intersection counting from the upper left corner of the- e/ g" W1 I3 r
                  ;; world.  -1 for non-intersection patches.+ t" b5 m7 J7 H; U
  my-column       ;; the column of the intersection counting from the upper left corner of the
: {: Y& t) Z# v3 C( H                  ;; world.  -1 for non-intersection patches.4 `2 N- G: C$ p
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( ]8 k% ^* M2 r% `1 W: M! O  c
  auto?           ;; whether or not this intersection will switch automatically.% B" T9 p) k. j  _# O( W* Z& K
                  ;; false for non-intersection patches.1 k+ o$ _9 @2 Z) e) f: S
]
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! A0 d- w) E9 k3 p, J" ]: E;;;;;;;;;;;;;;;;;;;;;;* R# U0 R! W# f" s4 X; h" F: W
;; Setup Procedures ;;' w3 L3 U$ ^5 M9 H& a
;;;;;;;;;;;;;;;;;;;;;;
8 G. D$ Y* @' ^' O: D( U: c( C: ]
; @) O4 t0 x: J6 `% S- F+ {;; Initialize the display by giving the global and patch variables initial values.
. b3 E+ O& s+ o) l& U$ h* J  l;; Create num-cars of turtles if there are enough road patches for one turtle to
) m) c. U- z! {. @;; be created per road patch. Set up the plots.# t" d7 g$ O, I; Z
to setup
$ S! W9 f6 U' O( I' V9 ?* d& \  ca
& T7 W( L; Y0 G! m2 ]) [  setup-globals
: z! F  k" B% Q) Q* W6 g: l7 T
2 ?$ ]4 h! O+ z  ;; First we ask the patches to draw themselves and set up a few variables
2 P/ z  y5 u( A( {  setup-patches
, o/ a( U" n1 i( n  i' w  make-current one-of intersections6 a+ t+ h5 p6 G5 x
  label-current- E- @% p8 M. h/ G  A2 [

9 `% p: d8 l- L" z9 H5 V3 c: g  set-default-shape turtles "car"' F9 E5 I9 H5 `4 l
3 C" m: s3 Y3 H0 v( a
  if (num-cars > count roads): T* F! g9 \+ }
  [
( J7 f, m, y( h7 @# P. u( u: ~    user-message (word "There are too many cars for the amount of "
! X- w9 H* \% Q9 I/ S; J+ r; J% R# q                       "road.  Either increase the amount of roads "
, \  }, ^, D$ s$ L1 C                       "by increasing the GRID-SIZE-X or "
* p3 \3 d$ ^7 e* X                       "GRID-SIZE-Y sliders, or decrease the "/ H* V2 ^1 X8 D% |
                       "number of cars by lowering the NUMBER slider.\n"0 O7 _  V% N4 m! l
                       "The setup has stopped.")
7 w- C: G! q. z! O5 n    stop
" {: c% q3 @8 X$ M6 b  ]
9 c3 d4 c0 _, L6 C# W; O* @- T; r: Z' ]6 }
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 @4 Z" }: p" l4 [+ U0 F
  crt num-cars
" W7 l9 Y( t+ }7 Z7 k% b* e1 O  [; a6 \% W* z  K
    setup-cars
& j, z* ^% y  M9 r+ F    set-car-color$ U, r/ S1 T& a! b1 A
    record-data
, i! a0 n( q3 E& U  ]  T9 A4 C2 `0 O4 A& @8 _, ~% j
; H9 k! v6 Z+ }' A0 u
  ;; give the turtles an initial speed4 E$ M+ I0 B6 n# `* f0 F
  ask turtles [ set-car-speed ]
9 P: m2 {) `& k' ^. l8 Z7 y& D. Z& w5 K* a6 j: n, Y
  reset-ticks
: Q* s8 f2 B" p" {1 Hend
, |' Q; s. b; l! R! ^
) q6 q. ^: U) q1 S;; Initialize the global variables to appropriate values$ U& p' r5 r& _6 B% l3 i' a
to setup-globals# m/ S3 q$ B/ ]$ R; o$ o
  set current-light nobody ;; just for now, since there are no lights yet1 q! n3 J5 A! L! U$ A9 U
  set phase 0
' S# {$ g8 ]/ ~7 a  set num-cars-stopped 09 k: E4 J6 N- z  s' F
  set grid-x-inc world-width / grid-size-x) f, k) t. Y  U: |- R0 N# @1 |
  set grid-y-inc world-height / grid-size-y; d# W, o: y" r1 D
" Z* i# d8 J6 y/ v- g
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 T! e: x$ q. N: C, r  set acceleration 0.099
6 U- e# u$ n5 w- p5 H  K$ Mend
& d* a4 f9 a, v( \5 |4 l7 W) t. `2 m, r* {
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 @" a/ K" e! u6 B" D
;; and initialize the traffic lights to one setting
9 h8 w4 {1 t1 `) j8 u1 O- K9 oto setup-patches
+ j+ @$ O; k8 z  ;; initialize the patch-owned variables and color the patches to a base-color
4 \* W$ F8 C) ^1 i. ?7 @1 z) [  ask patches
( m& @4 z# W' l  [
5 {6 I! G- F8 }    set intersection? false
  G1 i) v3 ^3 n, E4 g    set auto? false
# p/ h$ p8 N% }* C: X    set green-light-up? true
* k! Z% U' r7 f, L7 R' ?% N+ {; a8 ^0 |& Q    set my-row -1
) j6 `7 v! ~# H- q( B    set my-column -1' w8 N4 Y; [' x/ B; L  T
    set my-phase -1
7 w& @* M8 ?+ v7 Q  W+ I5 [    set pcolor brown + 33 N& d3 e" Z. a7 j8 P6 s+ g/ k
  ]
) G$ j% I: i* W7 a# F: A6 Z9 {& P  W4 Z# P
  ;; initialize the global variables that hold patch agentsets) y* p) D5 K! G+ s4 f( A  j
  set roads patches with
& T% L+ _. O; L) m    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 g5 O/ ^9 h( k# ]' s. r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) v6 C' |+ ]! e. p
  set intersections roads with6 U+ l3 ?% M+ c# m5 J5 e* R) h! U- v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, W0 J9 i, e$ G4 n& ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  @3 X8 z5 d* _0 `0 }) w. o) X
9 A9 N3 u6 K+ _# X! @% z" ^
  ask roads [ set pcolor white ]/ y. y* h7 @( K
    setup-intersections8 F; g4 ?" _8 k4 {# P
end1 ]+ f  k. D+ j/ R, p
其中定义道路的句子,如下所示,是什么意思啊?. {* l$ o, S  k# d
set roads patches with
% t  J1 O4 x6 `# l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: J. p" R' {3 i3 e) ]' q- D! X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 x0 `/ g6 [, O0 V; l/ D8 Y% E, [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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