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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。
) E, }5 @: g+ M6 D* b4 p5 Anetlogo自带的social science--traffic grid这一例子当中,
" \& L) r) Z) G" }! Jglobals  y* l( X" K4 Q; d& o1 g, S3 W" w
[: [4 \- {; j: Z" n1 ^
  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 D4 L- _) U( g0 I% r
  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 X( F% G- I1 E% w
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
. }6 {$ Y5 L6 ]. {$ I+ u                           ;; it is to accelerate or decelerate" W( v3 L9 Z2 A- `3 k
  phase                    ;; keeps track of the phase( d* {1 K6 p% m# h& X8 a4 z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure6 s) i( {6 M, A
  current-light            ;; the currently selected light% f7 y* S. i: x5 W
3 k, m# I+ i& Y% l( j- h# \+ k
  ;; patch agentsets
3 M/ B0 Y. X. @8 X  intersections ;; agentset containing the patches that are intersections* y9 t* }3 n7 `( R9 {) b' h& ^5 `) x
  roads         ;; agentset containing the patches that are roads
; A8 r# h! g+ Z: Q' l]3 r* ]  E2 ]5 k

- }% S2 u, |4 p8 m% c% Nturtles-own, I  c8 Y4 K& N# k/ k
[
5 N# m: J# ?) t: Q! v% M  speed     ;; the speed of the turtle
6 X/ H: m9 I) K2 a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- M2 x! z7 z; @, I- P3 |8 Z  wait-time ;; the amount of time since the last time a turtle has moved5 S8 x" G: d7 P* B% t' R# r  J# J
]
3 r' w6 n/ W/ q( {6 f0 U# X( |. P1 _$ P5 y$ Z
patches-own/ @. G2 t4 M% N# Z
[  \) n# ^; P9 X! `) X) z
  intersection?   ;; true if the patch is at the intersection of two roads% |: ~6 f8 z/ _) y, }/ S3 V
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.+ q3 @4 t2 @3 o* g" C& ^
                  ;; false for a non-intersection patches.- j6 ^' }$ p4 D3 [
  my-row          ;; the row of the intersection counting from the upper left corner of the
2 n  s, K  Y1 Y) s/ R2 G* X! O                  ;; world.  -1 for non-intersection patches.
  o& a6 [+ _  q# R! f  my-column       ;; the column of the intersection counting from the upper left corner of the
+ _8 a; q, B8 V- s. q% e                  ;; world.  -1 for non-intersection patches.
' S" c9 @7 s6 ?9 Z- ]  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# v9 e& a6 ?6 r1 S" z  auto?           ;; whether or not this intersection will switch automatically.+ }0 {# v5 Y) {) r- R! G
                  ;; false for non-intersection patches.& C1 I2 S1 p+ D, _6 e
]
, P$ u' D/ _% [8 w5 P1 W2 ~* f* a3 }- R- W2 W

8 `2 R* g$ m  i: b/ ^;;;;;;;;;;;;;;;;;;;;;;) O" t3 C( k# Q: y1 f% N
;; Setup Procedures ;;  |* X, P, C. R9 J, d9 j
;;;;;;;;;;;;;;;;;;;;;;
& @- y$ v/ ]: W. n( Z" \9 V1 ~  R! t- }, U/ P
;; Initialize the display by giving the global and patch variables initial values.& g2 L! D9 J! z- q9 i1 P
;; Create num-cars of turtles if there are enough road patches for one turtle to- ?+ |# _1 d4 r# S
;; be created per road patch. Set up the plots.4 S- V! ?- ?0 M7 n7 r
to setup
4 w. [/ m) h( W! M" t7 r8 U. z  ca
* a3 G' `8 N9 T7 |6 e! ?7 x+ P2 X  setup-globals! V& b& N) a( ?1 s* n  z+ K1 H

  L  G6 C# y7 T% A/ `6 G, ]$ @7 {) @  ;; First we ask the patches to draw themselves and set up a few variables
. J5 H0 V, C9 q: @& ]  setup-patches7 y  f; D" r' D1 y6 P8 H
  make-current one-of intersections
( i: }0 U% R* ]( ]2 |1 |/ O! D  label-current8 n* I! C3 q. j

7 D6 y& \! o0 r5 f' X  set-default-shape turtles "car", t: S9 E: f  e; L! O& |

8 K  Y/ ~2 ]/ b& q! L  z1 _  z  if (num-cars > count roads)$ D. Q$ H) y9 Z2 O- }
  [
! k; ]/ I0 w3 r    user-message (word "There are too many cars for the amount of "5 A8 O" \: J! k  ~: q  t
                       "road.  Either increase the amount of roads ": o0 \( `+ m, o
                       "by increasing the GRID-SIZE-X or "! p5 Y" |& z2 T* E  ?+ F
                       "GRID-SIZE-Y sliders, or decrease the "
' Q9 E, [1 o5 S5 J# `                       "number of cars by lowering the NUMBER slider.\n"
. E4 h  H, v$ `4 V, ^                       "The setup has stopped.")
; z/ f3 D  F: V( z* i+ |. N. B" E. Q2 f2 X    stop+ j" w; y5 f! \% s3 A
  ]
6 A7 x8 P- Z5 W! N$ y5 B% I* A( `, y6 z+ b
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 H- m- J* X8 t2 u# l
  crt num-cars# R7 b0 o* Q  x: T+ C; n" P! k& q  G
  [
& J* ~4 L( U; |& T1 N    setup-cars
5 D" B  s* ~% w9 k, i    set-car-color
& A/ `0 L5 o' w% o$ u! H4 Y, @    record-data
( A+ l# N1 W9 d+ |  ]
3 e; y) f2 g+ j5 Y0 q. B+ x5 q! y, x& i7 ^7 B* h
  ;; give the turtles an initial speed
5 r3 }4 y. O* T* [  ?  ask turtles [ set-car-speed ]1 Y9 ?: B5 u  ~8 G) D3 ^* n

$ Z" T  s( S  l- T8 d! ]% Y+ C8 R+ |  reset-ticks
& [% u4 H. t. t; R( o0 wend/ S/ {+ S. F3 X2 E2 g, @; f

2 f9 q  f7 C7 ?1 x: t3 }/ I;; Initialize the global variables to appropriate values
: V1 k+ o4 f; a/ ~to setup-globals/ s* ~3 T% A! N% P& \2 L
  set current-light nobody ;; just for now, since there are no lights yet" ?9 O* }7 |& v& [  r
  set phase 0
, i/ f7 C- h( s+ k  set num-cars-stopped 0: d! A" n, l( J4 Z4 B) W6 {  e4 z
  set grid-x-inc world-width / grid-size-x# L& @! Y1 q$ I
  set grid-y-inc world-height / grid-size-y
9 X3 l% t1 G/ h2 ?+ `9 W! v1 S  A# j
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* p* B( u. U% b
  set acceleration 0.099
  _1 u; \, {- X; i' g0 @end6 }$ s5 t. F1 v1 v
7 g! b5 m) V1 y8 H- ]
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! E& O5 S9 j; F6 b;; and initialize the traffic lights to one setting
5 H/ j6 f3 D' _/ t) M6 R5 ato setup-patches
) I" t6 z. k, ]3 r, ~  ;; initialize the patch-owned variables and color the patches to a base-color3 G+ [' _( O2 g& Y) ^; U
  ask patches
* R9 Y( h+ @8 m  [; l  M" P6 ?* V( m! p
    set intersection? false1 r: G5 C& o" M$ O2 n
    set auto? false
; _- K7 p' d5 q0 D3 s4 ]$ p    set green-light-up? true! D" z* _: `8 b4 T* h
    set my-row -1! m. |1 K5 B, [% C% P2 N; k+ k
    set my-column -1' f; H! U, N; G9 `. C# n3 Q) n0 s
    set my-phase -1' j6 \( ]! }% U- j3 t
    set pcolor brown + 3' n' O8 V4 M: T' c  M( J
  ]
$ a$ Y/ O6 `% k2 t2 w5 v- j. e) F7 L, Y
  ;; initialize the global variables that hold patch agentsets! ~2 j7 q/ R0 S- h9 L' U& ~9 ?+ n
  set roads patches with) y4 s6 j: m  |& E! J1 r* m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- \: l% H6 N4 a1 \0 r4 l8 V; z. v% ]* D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 _$ P/ _7 R' P: N& x  set intersections roads with) f9 }3 p2 M' D3 h! ?; e% D' D  _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  F+ Q: f  p# D2 d- j* ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' }2 X: n, x# J* ^
/ n7 }" Z' e& i* u* \8 _  ask roads [ set pcolor white ]) ~* i( H6 j1 G
    setup-intersections
2 [! i! R( C/ R* ^end
1 L- G2 v$ r0 v5 Q其中定义道路的句子,如下所示,是什么意思啊?
' A3 F2 q0 q6 @* W( `% r0 r set roads patches with7 d7 d6 c1 ?: Q. E- p& Y8 t2 x3 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  ^7 p8 h% S5 K& s: J" V- D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. }2 L# J5 U; B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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