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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。
0 T2 t; ^& m! g! t" |netlogo自带的social science--traffic grid这一例子当中,
+ v$ d% X6 s9 `globals4 v; @% X0 l( E. Q3 C# O) e2 i
[5 A; G8 R4 U6 T7 `& i
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! K5 e  [) q: X8 @  R: Z& x" L9 O  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! l8 M' y- n" b; b  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  q9 v7 o1 L* U; @" D6 h
                           ;; it is to accelerate or decelerate) q0 y& h. r1 C7 [& _
  phase                    ;; keeps track of the phase
# L+ O& u$ d5 [9 V  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 b# j' |/ C: ~2 a2 f# J5 X1 M" U  current-light            ;; the currently selected light
  W# A& M% R5 J7 T' v
. t  q+ Y/ l- k, i$ X  ;; patch agentsets
% q( t& {4 S, u+ [7 A9 A$ O3 i$ x" D  intersections ;; agentset containing the patches that are intersections% G/ y7 K0 }9 V; o5 o. A
  roads         ;; agentset containing the patches that are roads
- i3 d3 A# [3 y% L+ x/ O) Y]
. u9 y! W5 c. X: q+ }5 z
) H4 Y) i8 }# A) A  [# Z8 @$ |, |turtles-own
% ~' B1 p- R1 C* i3 N% L4 t[
/ O/ q; i& G" {9 P  speed     ;; the speed of the turtle
  K8 }" ?3 `( x! B4 g* u  v6 E  @  up-car?   ;; true if the turtle moves downwards and false if it moves to the right) Q( |( i8 V/ \" v
  wait-time ;; the amount of time since the last time a turtle has moved4 f3 w$ @2 ^5 [/ E
]
4 u/ y3 B# X- L6 s
" P) ^$ }9 @" v, F# _patches-own7 J" t9 X9 q1 y
[
9 S. K5 ^$ x- ?: J$ M: I! N1 Y  intersection?   ;; true if the patch is at the intersection of two roads
. ^% ?* N4 P! D  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; T( y! ], v! O: X                  ;; false for a non-intersection patches.# I! w; r# V; r. T9 Q
  my-row          ;; the row of the intersection counting from the upper left corner of the
0 u( ~. L8 d# X+ Y                  ;; world.  -1 for non-intersection patches., Y) Y$ o) T" u  {" `
  my-column       ;; the column of the intersection counting from the upper left corner of the
1 h3 S; ?0 w( Q' \: o  ~& h                  ;; world.  -1 for non-intersection patches.
9 c  G* w) y% K4 ^( c  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
/ ?9 U& ]0 F  W9 ?  auto?           ;; whether or not this intersection will switch automatically.
2 W& a& v; E4 N( j* D" g, b                  ;; false for non-intersection patches.$ v) [( o  C  w( j
]! s) N9 ]! a; O
3 _4 W% ?% P+ R" l5 Q
4 E2 m* C9 ^( v5 T; d- F
;;;;;;;;;;;;;;;;;;;;;;: w* U! q6 D* [% p. F* h9 ]
;; Setup Procedures ;;$ G# j; M3 b5 _1 H  l$ |: O
;;;;;;;;;;;;;;;;;;;;;;" p4 G2 c! R9 Y8 Y! N
3 y& Z. [* E/ p. F
;; Initialize the display by giving the global and patch variables initial values.
& h' e, C% H: {" q1 Y1 P- z; Y! c;; Create num-cars of turtles if there are enough road patches for one turtle to1 C7 W2 Z& z1 g9 @
;; be created per road patch. Set up the plots.
3 ^2 P- ]& E# W& X+ d+ nto setup# q+ l) g; W9 p6 _6 O: c( P
  ca( \% |8 V! Q) S- r' h
  setup-globals1 _. x, a; L; k, h0 N: m
0 G7 {2 c3 g; d* ^- {' E' `* y
  ;; First we ask the patches to draw themselves and set up a few variables
) s5 K2 T+ M- s1 q" w# m  setup-patches
9 e3 A4 _. `, A5 o  make-current one-of intersections1 B, W. p1 f" [1 @' s
  label-current
7 G6 V, F4 G1 f! E
( i4 I) x& g9 g  set-default-shape turtles "car"
. C6 L5 Q. s/ k% \0 b% F
  B9 V: B" R: q' p5 T6 y& v( O# S  if (num-cars > count roads)" [1 X2 p8 t; z% ]" ?
  [/ J; G2 Y, K* Y/ h) m8 C1 b5 K5 p
    user-message (word "There are too many cars for the amount of ") C1 p# s4 O4 x3 V: c) @
                       "road.  Either increase the amount of roads "
% P& t/ L% H9 w' v. W7 i7 d                       "by increasing the GRID-SIZE-X or "" _1 Z: g4 E8 M9 }) X
                       "GRID-SIZE-Y sliders, or decrease the "
# S1 Q( p3 G/ F' O; N% J                       "number of cars by lowering the NUMBER slider.\n"
/ b6 O: m8 l) C- |                       "The setup has stopped.")
# A% b6 e" q7 o! C2 |& D    stop
0 {9 m! G0 i' q/ a  ]
6 T6 h1 u% a# t+ Z( Z0 u& X: W% S/ l2 h' w4 e& c
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ Z$ w: y3 J" p* x' }! y$ q  crt num-cars
& F& _& R1 S- n1 n, t2 M  [! n* _5 }7 G. y
    setup-cars1 J4 V! @, r& t
    set-car-color, X- b. x4 J( e" m# C
    record-data
, p5 r3 s; {# x, r9 M0 R  ]3 Y6 a$ ~; F! F2 C0 ^; k) v

( @) C  D4 ?" E5 {  ;; give the turtles an initial speed
/ S. h0 m; h9 ~, b+ S  ask turtles [ set-car-speed ]$ K0 s' O* g. N2 R7 O
' e* w- ^. w; ]  e
  reset-ticks
4 p% b* u- `# y: M9 hend
- L5 ~9 D5 v9 \2 S: X$ `+ u# T" @* v3 j. C* f; r9 ]
;; Initialize the global variables to appropriate values. f4 I) @2 @( u* x# Q& K# f& P
to setup-globals
: t3 K8 P) P1 x9 l* g  set current-light nobody ;; just for now, since there are no lights yet( [5 k6 z9 e! Y/ r
  set phase 00 p. S3 k7 _' ]9 R* S
  set num-cars-stopped 0
/ }3 l9 \' F( G* X  set grid-x-inc world-width / grid-size-x
2 B+ s! [2 d9 k3 J7 z; d8 d/ k  set grid-y-inc world-height / grid-size-y( V- ?% R! L& k! V* x# V' O
+ T/ y  H7 y3 U1 w
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 g# y$ V- \7 D  X1 i  set acceleration 0.0995 C0 _  _# b2 W5 u1 Q( W
end
7 V0 X8 |  h& j2 q% v7 A( w  Z% c2 p
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' R' v0 W# }: W/ x* @
;; and initialize the traffic lights to one setting
2 M% r7 j3 x# u+ i/ k1 K! kto setup-patches, S6 n1 V! ?: s# M
  ;; initialize the patch-owned variables and color the patches to a base-color. l, ^5 L# y% N: x: h. J, I/ b
  ask patches
2 b4 g/ P# f8 Z: |! T; U" y  [
+ C7 l; c* N6 _4 N: }2 d    set intersection? false
# }2 {9 G: ~3 q0 q) L$ G    set auto? false3 z1 C" j; J$ T& D9 c1 i8 ]5 G
    set green-light-up? true1 m1 b7 c& P1 |% Z: y
    set my-row -1
+ k/ Y3 ^- k" K0 M    set my-column -1
6 ^$ V* M. V7 O5 w    set my-phase -1
8 d/ M8 L5 b) v    set pcolor brown + 3
9 F; q/ X! h0 n" ?9 E  ]
! T' n$ A6 j* L' V3 Q
( [% Q( R8 y+ [/ S& }  ;; initialize the global variables that hold patch agentsets
, A9 x* R) _+ g& U) I, N. h7 C  set roads patches with/ c! \* ?$ O4 d" [/ M" }
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" F3 {$ S& Z( c" J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" O  Y+ J7 U) E- E) y
  set intersections roads with" ?6 i2 [) p" j3 O: ]- \4 _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 W" b+ S, a+ q& I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ f7 }. y& o4 [) p- V
; r- C2 {0 o4 u2 O
  ask roads [ set pcolor white ]: ^8 h8 f8 I; C. A: O5 j* ?$ h2 j
    setup-intersections
, i  S! r, w( \% \' o( m5 jend
9 [$ N* e5 Q+ [" R其中定义道路的句子,如下所示,是什么意思啊?
7 j( x; \- a, c* B- r6 f  h set roads patches with
1 W  p1 B* p" Z/ k8 f( j! D    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ o1 O" l' v6 ~; e( h; S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 ?" {. Y& b5 J/ a( o! 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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