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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。, R9 V2 _0 @. f4 i/ R
netlogo自带的social science--traffic grid这一例子当中,6 B6 S" N! [/ c) M
globals
( }1 H8 X* g; z$ H/ j( w[
: [' Z+ ~! a6 S* m( F# }  grid-x-inc               ;; the amount of patches in between two roads in the x direction( W* {" x5 r+ P- F  u9 l
  grid-y-inc               ;; the amount of patches in between two roads in the y direction, j- B6 D% C/ c) o' J0 p
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" E4 i( J* C* G8 J                           ;; it is to accelerate or decelerate
0 G$ N4 r3 Z: ?  T! o$ ^  phase                    ;; keeps track of the phase" R2 P* D. C$ C1 Z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
& @' s9 D( p: I6 }! P  current-light            ;; the currently selected light
5 Z1 }# D' \8 t3 a& }- Y1 t: a& R# q% @
& F9 S5 M" H; M# F3 {% n! l/ D7 d) m  ;; patch agentsets
+ b1 n' z, B( F$ B( l  intersections ;; agentset containing the patches that are intersections) H( K! q9 w0 f0 w. [* ~, V4 z
  roads         ;; agentset containing the patches that are roads: d& N( s* N8 v) `" P
]
4 c# X6 U6 F" B
  @- t  w6 H' D: u' ?$ b2 Wturtles-own0 S' O6 {) _& n' W6 t8 v
[' D( P! P" S9 p  j7 ~
  speed     ;; the speed of the turtle
% _, ~, ]( }: a- ^3 P3 A3 a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right" z7 ]4 k1 w* F: n
  wait-time ;; the amount of time since the last time a turtle has moved
! h$ V6 {3 @5 g- b! o]+ p& W: I5 C" D5 j1 Y' o5 v; w# H

- F1 m" S6 z, @4 k: m# }( X" ~; dpatches-own$ w& N. D! C: d6 S4 P7 B
[0 e1 T/ j4 m4 |# |0 o, _5 F
  intersection?   ;; true if the patch is at the intersection of two roads
' }7 H0 @0 {" I2 D( `0 ^+ M; y! u  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ Z. e8 W, u- h1 p0 [) U                  ;; false for a non-intersection patches.. }/ q3 f% m* ]. A3 Q8 p. i
  my-row          ;; the row of the intersection counting from the upper left corner of the  S8 t# }; ]/ M5 m/ g1 Z
                  ;; world.  -1 for non-intersection patches.+ j3 }# P) ^( |3 E. O. l
  my-column       ;; the column of the intersection counting from the upper left corner of the% e3 g( l$ P2 s1 k% Y6 G) U
                  ;; world.  -1 for non-intersection patches.
1 `5 E1 M6 h6 s# [$ c( [* U  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.5 q1 W" l7 S( g
  auto?           ;; whether or not this intersection will switch automatically.' p* P& ~; W6 M( I
                  ;; false for non-intersection patches.5 Y! G0 o) G7 i( s* z# G
]
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! I& X9 _  s: s! K; O3 d, |! X7 o! m- d( I0 {; L/ v& _" J
;;;;;;;;;;;;;;;;;;;;;;/ h: O3 {4 K8 ~7 d
;; Setup Procedures ;;3 b& y5 d7 G" F9 l7 ^
;;;;;;;;;;;;;;;;;;;;;;. V; |" g  z, I9 ^& L$ \# N8 H8 t6 w" h) o

: v7 y8 f% r1 ~$ V* G' [;; Initialize the display by giving the global and patch variables initial values.( C" x4 X8 t7 Z7 J
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ M7 j2 H& F) ~% L  ~( }* o! t;; be created per road patch. Set up the plots.
, `5 L$ O3 E+ M* ato setup' R9 P  A( s9 X( d: \
  ca
0 K5 _) _% U- {' \3 b  setup-globals
- b  m  _2 K7 u! M% L
6 K+ {! V. ~& Y* I, `  ;; First we ask the patches to draw themselves and set up a few variables2 C! `9 |7 U* j4 t- b& j' l2 `3 d% d
  setup-patches
/ M" W5 T, w# L9 ^2 P  make-current one-of intersections
" }" ^) Z) u' F; ]& w  label-current% v( L6 d% g: V/ H1 N
* y4 t* P; s$ s3 C" }. f
  set-default-shape turtles "car"' v/ d1 o" {2 ~3 f2 B7 N* y* T
6 D1 a$ _0 {" e' m# A, l
  if (num-cars > count roads)# F* d8 S! k" O' a: I5 ^- E0 D' z
  [! X5 r2 Z* g9 l3 x% M
    user-message (word "There are too many cars for the amount of "
3 p/ w4 z3 C/ ]) d4 {                       "road.  Either increase the amount of roads "
; c% W# j, T  Q: p' q3 F                       "by increasing the GRID-SIZE-X or ". M3 X  B* i1 w8 I, w5 N; j+ Z
                       "GRID-SIZE-Y sliders, or decrease the "
3 H$ `9 A$ f0 g2 T' h8 ~% j- V, R                       "number of cars by lowering the NUMBER slider.\n"
* R7 @+ e: @6 u( i' e9 ~" Q# c                       "The setup has stopped.")
- X0 [6 ~% a' x! q! ~) D    stop
5 I3 v8 s6 b4 o3 n* e0 P* Q. L  ]
/ k- g  Z, X! Y4 j. E- C1 [6 c8 b% m1 X  T6 }& H
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" I$ k! m7 p! s1 N" E" y; e5 e. ~  crt num-cars
  s* w, O+ M$ M+ G, I9 X  [
8 q9 [/ ]" U/ R    setup-cars
9 H: K9 g' ^& ~, E. X1 R& k    set-car-color) a- S) ~5 `0 y& Q! i  o" s% ^: }1 v
    record-data
+ f2 W. B' O# ~& {0 U  ]# I4 ]( G9 Y7 x  @

" t) g3 D& [, w. H+ u' `  ;; give the turtles an initial speed- `4 Q1 n' m. l
  ask turtles [ set-car-speed ]
  V( m. t# j! \5 W+ ^& `1 Q1 f8 r* a) Q( X2 F! H2 M! j
  reset-ticks. @1 x4 v8 Z3 ?# }  I' g
end
' v2 f2 G6 ]  _) w. Y. r* s. Y7 D' }6 S" ~# Y
;; Initialize the global variables to appropriate values
9 D' h" e( Z  b; m+ z/ u0 \) a7 B* uto setup-globals
% ~/ h* u: q9 D5 z" T  set current-light nobody ;; just for now, since there are no lights yet
  c& Z) x% T7 c( A  set phase 0
0 u) S, z; A  G% H  set num-cars-stopped 0
2 q5 m2 g/ n$ C) w  set grid-x-inc world-width / grid-size-x
& ?. `' {3 }- E# ~" I  set grid-y-inc world-height / grid-size-y, b$ A0 ?8 h9 E( r/ S" b7 H

  H5 ^2 n: x1 ?6 v3 ?1 u+ z6 E  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 J. i/ h7 K5 @7 C& s. [: ?- Y  set acceleration 0.099+ a: F' a& `0 K& o: i. A% j
end
" p* O2 U  z* u2 n: r! |" T: d4 J1 n" g! P* s3 w0 v+ P; Q3 a( u
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ ], W$ g( H8 ?5 ?  Q9 P5 Z
;; and initialize the traffic lights to one setting
  {) m* T9 D1 Q5 Fto setup-patches
) z+ m+ l7 A6 H& T  ;; initialize the patch-owned variables and color the patches to a base-color9 h; R  _& j) m
  ask patches
- s$ Z7 W! ~, Y, {1 ?' V  [" f+ x2 m: g0 d7 K
    set intersection? false
6 E! B) ^  e* _9 b8 A    set auto? false6 t$ `3 M. s$ c" y* j. N
    set green-light-up? true
  P) Z, J  l# Y4 A    set my-row -17 o1 |" E6 ?. T. h: Q" S
    set my-column -10 ?7 @- V: T8 u3 X# x) A- F
    set my-phase -1; x/ C0 [+ o0 [  M: Y
    set pcolor brown + 3
' p: ?5 I% O5 Q5 l+ H! E' ]  ]
3 Q; X; A- w  Y4 w& s1 _8 B0 ^0 e
- t5 a9 o' [; d  ;; initialize the global variables that hold patch agentsets. n! y, k7 K0 A5 [, G# S
  set roads patches with- ?, C7 t$ \3 o; D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ Y* r8 ]0 O" Z1 a( ?3 I" g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  J! r2 x) P: C3 ^$ [  set intersections roads with( Y& t+ P2 E7 L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ |* ^- j5 o3 w/ e/ c2 F+ V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 v! u5 D2 p: O# o
; i, g+ G: o' g# x7 f- g6 D5 j  ask roads [ set pcolor white ]; f+ |5 j$ Z/ l4 u# ^
    setup-intersections8 w  [, L* o% x$ r
end  _/ t. x5 W, B& e: J3 p
其中定义道路的句子,如下所示,是什么意思啊?9 n4 K6 k$ P5 o, B/ v
set roads patches with
4 z6 p7 x+ a! R; y% L/ A0 l( p- }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ F! K6 F! V6 W, I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 q+ y4 X( Q5 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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