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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。
2 `( [5 q+ s' Fnetlogo自带的social science--traffic grid这一例子当中,5 c$ Z& ?$ U! w, u- V* e$ {
globals3 @: c/ ^5 s; t" {9 _
[
& @% m/ g2 z$ c. _1 Y! |. T  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# x# l, h1 p9 w" @' Y5 [0 L) F  grid-y-inc               ;; the amount of patches in between two roads in the y direction
2 u/ q* A% s0 O6 D0 D3 U1 C+ _" T  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: E) J9 @7 ~) V# m$ z+ {5 c
                           ;; it is to accelerate or decelerate2 x6 `; b. H7 H4 I4 O
  phase                    ;; keeps track of the phase
7 ~/ j. [0 a' b$ {  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 c( V1 y/ ^2 B7 P8 k+ C# t; O0 g  current-light            ;; the currently selected light
7 q* u8 x+ E8 i: w1 X
8 J) `$ @3 i0 k0 u, m% x5 }  ;; patch agentsets1 K0 Y9 ?6 W+ E9 y, `! p
  intersections ;; agentset containing the patches that are intersections, S3 \; E2 y- @: a3 {
  roads         ;; agentset containing the patches that are roads6 i* G1 L6 X; O# \: }8 W' Z0 {
]
6 A6 b% e/ F" G! N, u% _4 N
6 x3 }/ T; I" `3 h7 k0 P: Y9 r. g. qturtles-own( f% ]* [% }  r4 E! d" K! @8 c. P
[  u$ {* }% E) K( s2 r7 t
  speed     ;; the speed of the turtle
' Q6 j' ?5 [' s5 b  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
% n8 |, n8 F2 ~  wait-time ;; the amount of time since the last time a turtle has moved
$ @% X" J( P- W$ U- l]
0 e5 `" s! K! V: X0 V- |! b% W7 m4 u1 t
patches-own" _$ S# w3 x# ^/ n4 A1 e- ?
[, H2 i  \2 i& V* W) k8 A8 r
  intersection?   ;; true if the patch is at the intersection of two roads8 T) h3 R5 z: @" H
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! m7 K  X* O' B; D6 n                  ;; false for a non-intersection patches.
+ K) U' u6 R: M- y  my-row          ;; the row of the intersection counting from the upper left corner of the
+ G+ V5 i* e3 n7 M3 ?6 |- O                  ;; world.  -1 for non-intersection patches.7 f; i5 ?4 i% T" t- W, {" p
  my-column       ;; the column of the intersection counting from the upper left corner of the
* G9 Z( i3 O) A                  ;; world.  -1 for non-intersection patches.1 h/ z7 |5 `% x9 `, m
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
( y5 ~  A4 X! O1 Z' ?0 u( F  auto?           ;; whether or not this intersection will switch automatically.$ n2 T0 F6 o) ?+ X
                  ;; false for non-intersection patches.5 W, l& s6 P' P% m9 S
]# {) Y% M; W! H) \, m" C9 Y

  _3 k7 C) m5 Y+ M' ^, p
7 i8 v8 y4 {! F1 t: y, v# S;;;;;;;;;;;;;;;;;;;;;;
$ ~/ o* J: W: i1 g) T4 |1 p6 c. X( h;; Setup Procedures ;;5 S0 C7 R" l- s3 |" u8 U2 m& S4 @- c
;;;;;;;;;;;;;;;;;;;;;;
0 _# g5 o; v% {% P
* Z7 H; C# ~- d$ ]9 d  i;; Initialize the display by giving the global and patch variables initial values.! i' i1 L- E3 B! Y4 n
;; Create num-cars of turtles if there are enough road patches for one turtle to: r: j: E% n9 T
;; be created per road patch. Set up the plots.! Z% l9 u/ a# B- N$ R; t
to setup
7 D0 R0 x( N) x* c3 u2 u. N$ \  ca
9 v, S& y/ x) ?7 V- |3 X8 u6 Q  setup-globals
# G* i- j9 B. y2 ^! L: I
% }3 }8 F6 t/ Z  ;; First we ask the patches to draw themselves and set up a few variables
' t, W5 k4 Q+ \- }$ c  setup-patches
* d% v1 h3 m. |" h  make-current one-of intersections
9 q: n5 [; P5 p, A! a- _5 Z  label-current5 N( E, w8 F, [- V# f' z0 j$ |+ v

- ]6 Z1 L9 Y3 m4 L" s' X) _2 e' e  set-default-shape turtles "car"( E' H( t& t- W' u% W
0 W# @# Z8 O3 j( q9 S
  if (num-cars > count roads)) G! p6 v3 V; R0 f' a2 ]
  [
8 F8 d( N- K2 z3 _# l7 {6 J    user-message (word "There are too many cars for the amount of "9 Q3 u* B2 }0 d1 ~) G
                       "road.  Either increase the amount of roads "
& d. M+ K2 w( W4 c( \7 V( c5 m                       "by increasing the GRID-SIZE-X or "% z) {& Y8 `" z: a: R
                       "GRID-SIZE-Y sliders, or decrease the "8 a. M8 |% d* Q" |# {
                       "number of cars by lowering the NUMBER slider.\n"
- v& q% k: h' x- ]/ m, s" r, n; M                       "The setup has stopped.")$ c  Z: [# j9 W& ^& o
    stop
4 I3 Z* G! R1 N' x  ]
1 _" t! p! s' [* K# t$ j' R- E! c3 w/ l1 |3 S# p
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 f, z, _: ^, N/ k  crt num-cars
% {) J8 h+ y* C% b5 h. X  [
0 ]) t' D) S8 ]    setup-cars9 q' D9 z" U2 J2 }) T2 \( \
    set-car-color! {7 e! s; {% r. X! c9 E
    record-data
. k6 j# @0 ?4 x/ H0 I9 O' }  ]
: N2 i# P% S1 r
6 m$ S5 ~- V* u% T% h  ;; give the turtles an initial speed% J$ A4 {$ `( f$ Y8 E2 {* ]2 [
  ask turtles [ set-car-speed ]( O! o9 H9 a4 E- U2 e" v- o5 i

' |0 A' I* m# m- ?1 C/ K  reset-ticks
9 g6 k' I, d0 {. A) mend
1 d' S" D  I, d
5 M2 R, h: ^- d; x9 b% V;; Initialize the global variables to appropriate values; ^0 f+ x9 C* ]0 ~6 D( l- b  @6 K
to setup-globals
% |7 w/ Y6 d0 a; P" y1 Y  set current-light nobody ;; just for now, since there are no lights yet
0 j: m& B: s8 l: L: ^/ T; l  set phase 0
7 @( I7 {! E1 ]8 C: Y/ ^  set num-cars-stopped 0
" A3 I2 ?8 v0 r# ]* h  set grid-x-inc world-width / grid-size-x
1 b* b* Y4 w* o1 V3 Z8 V  l- F$ o  set grid-y-inc world-height / grid-size-y
0 m+ t4 v' C9 S$ `* o/ Z# j" U8 a" f& B2 B, C
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# V. y. [2 `. W! z  m( x4 {  set acceleration 0.099
) I$ L8 ?# J$ v& B" E9 r' bend
* v; j6 u2 Q0 ?2 K" @5 A
( w) ^. f& C+ U& ]4 O: B* ]$ L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& T* g3 g1 O) A5 d8 m+ Q2 c% M
;; and initialize the traffic lights to one setting7 Z$ E3 P  T7 j- ~
to setup-patches
( ~" y! R) m( n3 B! i: _0 t& |6 G  ;; initialize the patch-owned variables and color the patches to a base-color, ?) Q0 G% E( {- J) d0 o( A4 j* s
  ask patches
+ R" @7 U: b' B1 I: V  [
/ @1 j" \$ B0 H- v    set intersection? false) S! Y# I9 o' o  |$ H. Z" o4 D
    set auto? false
5 [9 }( _7 O( }6 r6 p# n    set green-light-up? true" k" C/ e1 p! ^) P6 _
    set my-row -1  R2 m' A2 I( B- |
    set my-column -1. ~' L  _$ v+ c. F# o
    set my-phase -1
4 b3 d4 B) E5 f' ?) h    set pcolor brown + 3  {# `: X  W" T% \6 R3 o$ u: g: _
  ]
( Z# [/ V/ k6 ]' p9 p$ m2 ]5 x+ s; S8 }! c* {
  ;; initialize the global variables that hold patch agentsets
  j. `" E: H/ E& c% g8 S. c  set roads patches with
4 J" j+ g" A; ^' p% `6 v0 ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; K" N5 v! U/ J1 Y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( B4 G! S! i( Y( g8 [
  set intersections roads with
- |& c( G" a) v, f: h5 v- O3 |    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 a, \( r9 h# C5 C* A6 y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# c- L, X+ d. m( A8 d2 H  d; d4 b$ D
2 c- v) d! l2 b& d5 T* Y( k3 n
  ask roads [ set pcolor white ]: g4 x! p2 Y1 `. _8 N, A
    setup-intersections
) `  ?, u3 r* H6 N, send
+ T3 U% L) B7 Y- |" ^: p其中定义道路的句子,如下所示,是什么意思啊?  G9 @5 v! f+ O; L! i/ k3 F4 D/ N5 g0 ]
set roads patches with
( S* \% k$ J4 g  T% H9 d; A# H  S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. l4 f" t$ a$ m: l
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* C( S  r2 Q, ~" ]7 q* L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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