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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。# n2 p- t' R* D, I  @
netlogo自带的social science--traffic grid这一例子当中,9 O7 t" y3 A7 ], H
globals
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  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 ~, t) N. o6 i6 e  v. ?& ^# V0 @
  grid-y-inc               ;; the amount of patches in between two roads in the y direction3 Z6 `- A0 b+ c
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 b/ Q" o+ i9 B, C5 ~
                           ;; it is to accelerate or decelerate
+ ~9 u7 }0 G# ]2 i7 E+ J  phase                    ;; keeps track of the phase- L6 O6 z8 m% D
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
) F9 d  j' P2 |. f5 I, K/ E  current-light            ;; the currently selected light
* v9 D. H% i" ^; q* Z
- O' t3 }4 m9 `; K* Q+ t# S  ;; patch agentsets
% x& b( L- E# J6 u( V! S  intersections ;; agentset containing the patches that are intersections  E$ R  P% h4 d) f3 a
  roads         ;; agentset containing the patches that are roads( d0 f( a2 {- E
]& t% Z& m# H2 p0 _
" {1 d# H+ j" z1 E
turtles-own8 @9 M5 r! [# L9 R! e% n. P
[7 l: G; P! t: {, J) U1 j0 M4 L
  speed     ;; the speed of the turtle8 j  Q8 ^  i9 V/ u( R" f
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
. T5 ~: G$ y: m5 t6 l  wait-time ;; the amount of time since the last time a turtle has moved
5 d1 O; L- F! x- ?  Q2 Q]8 k# O2 {6 Q! `# y% E
' Q7 A4 q0 H# F6 I& s* X: Z& F
patches-own+ W9 ?" p; T. J
[
- o/ o4 d* x4 {2 e/ ^  intersection?   ;; true if the patch is at the intersection of two roads& }+ {- g/ p* o
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.7 C: e; r) r! U: f
                  ;; false for a non-intersection patches.
; M. H. \  g1 ^4 i2 o  my-row          ;; the row of the intersection counting from the upper left corner of the
/ v# ^( b; r& V- w1 f: a; K  H                  ;; world.  -1 for non-intersection patches.
0 x7 y( {- M$ k' l, i7 o& m  my-column       ;; the column of the intersection counting from the upper left corner of the: Z& {" {# ^1 u: o7 ?
                  ;; world.  -1 for non-intersection patches." V9 h0 K& r" f$ Z8 B- K
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. ]! X* U# v: Q1 h' y  auto?           ;; whether or not this intersection will switch automatically.1 g5 T6 Q* {  ]5 G6 b4 h- J
                  ;; false for non-intersection patches.
* P, X) q4 U& K# b/ ~]
3 B+ u; g; Q; M* F; h  H
$ R" \! X$ c% O) b  c
5 G1 X3 I) A, I;;;;;;;;;;;;;;;;;;;;;;
  H' @$ T5 G/ K: S, q;; Setup Procedures ;;
1 x1 ~! ~3 P$ K2 ~/ m4 I;;;;;;;;;;;;;;;;;;;;;;, H7 \) C! Y* F7 X

8 W0 n& f- ~+ h8 l8 p6 I2 @;; Initialize the display by giving the global and patch variables initial values." b6 r, r8 F% q& I
;; Create num-cars of turtles if there are enough road patches for one turtle to" I3 p* ~. c1 j
;; be created per road patch. Set up the plots.
6 i0 }8 Z8 p% i3 [9 |! ^: F2 H/ Yto setup- k& G$ m$ G2 R4 s: v
  ca6 o! t$ y& y, f" h  [% k
  setup-globals
, _5 v' Y3 N/ S; u3 D8 b! J) W
1 k# ?5 B4 Z7 {  ;; First we ask the patches to draw themselves and set up a few variables; \- `. M' Y) @" _
  setup-patches  M) @: r1 ~, N3 }/ x- |  g
  make-current one-of intersections, V/ h* w" J& |
  label-current* A1 s7 N0 d  X
$ `; J- T0 z0 W' a
  set-default-shape turtles "car"; `1 y  {! P+ [" ]6 R
+ v9 I: p5 W, c1 a3 J
  if (num-cars > count roads)' k, u3 R4 g6 E
  [3 L4 y2 I6 ?: f( T( p' s
    user-message (word "There are too many cars for the amount of "& I+ y- E: e9 d- ~: M' ~2 O
                       "road.  Either increase the amount of roads "7 g. o; S8 s) D; [' b& ?6 R+ V
                       "by increasing the GRID-SIZE-X or "/ _5 |+ H2 L9 x. `1 f
                       "GRID-SIZE-Y sliders, or decrease the "7 K& x1 b6 {! g
                       "number of cars by lowering the NUMBER slider.\n"
/ |4 P" k( ~; {, i( S6 b" H5 k! J+ l                       "The setup has stopped.")
8 A  \6 G* V2 v3 g/ R3 ~    stop
4 y5 y& `9 w3 E: p$ j3 }  ]- Y% `! l' q4 ^; r' b# B
1 F* C% j7 x' _5 h+ R+ f& P
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 U- r; `* ?% ]7 Q( c  crt num-cars' F) @: |7 q& y; \2 d
  [
; T) f$ ]7 t) h# C* K7 Z. |+ v: }    setup-cars
0 g. j# j& g/ @& b; h% \    set-car-color
8 B& U3 u' G/ G+ D  ~- k. b    record-data
9 U8 A" U1 P' w2 x! ]  ]) j9 K6 H0 f# I! _# s/ t
9 C- O4 U* x& z) k" F; A' Q
  ;; give the turtles an initial speed7 \* c! d0 u6 t$ n) I
  ask turtles [ set-car-speed ]
: ~/ U; E: R3 ~. ~. m- I9 q2 h+ G+ o+ [* H$ \1 B# a, i
  reset-ticks
# P( y* l/ T' J3 r1 \end
. _* o9 \, S2 r2 p1 h0 K, ]/ W. }, E
;; Initialize the global variables to appropriate values
: u1 f5 Z) K. f( _/ L9 ]to setup-globals
8 x! j: i2 z( j& s9 ^  set current-light nobody ;; just for now, since there are no lights yet
  r$ x5 A2 R; f% I  set phase 03 X$ a' N2 W  w% W
  set num-cars-stopped 0+ I0 K  ~, ?. J' i6 J
  set grid-x-inc world-width / grid-size-x
! `2 z4 k( b4 E# W8 U& E$ K  set grid-y-inc world-height / grid-size-y
) D, h; ^8 x( \& V2 ]  \! A0 z# s& B1 W; E2 x
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' s* u6 m% c, u4 S2 f  k6 Z) o
  set acceleration 0.099
" z2 d9 l9 O/ rend
$ b) Z6 D9 E. [! G* k8 J
: V- c  R3 ~# @3 {8 P0 [8 Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ X5 y/ K# v% A" C% t6 E, ]
;; and initialize the traffic lights to one setting
: r8 Q1 o9 n4 J% b" hto setup-patches
# y- @  N% \& ^  `4 T' R( p  ;; initialize the patch-owned variables and color the patches to a base-color# U' F) F6 C  X- ~0 u; a1 V
  ask patches4 m" @/ w/ D) v  _" o
  [$ a9 ^) v' s* P6 d6 G
    set intersection? false, D9 N: S4 n. x
    set auto? false7 {3 q+ {0 N7 b& w% j  t
    set green-light-up? true; c. R: E5 M( {/ @1 a
    set my-row -1
8 E& J' Z/ f* `* g9 x8 k% @- |9 g    set my-column -1
7 n$ Q. s/ B% T; H9 W+ q    set my-phase -1: }# t; h: F- w. Q" _1 Y! T! U
    set pcolor brown + 3
% _9 J* w: p* b! r  ]9 O( m, f& Z& ^, h

& |* y. Q( A  H  ;; initialize the global variables that hold patch agentsets6 Y9 \1 [1 b5 L
  set roads patches with7 k9 c' v2 J. z9 D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 l$ q; W+ c4 b: M# R; l2 T* a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- `1 ?" ]/ _  E3 G  set intersections roads with1 @* w# P1 P5 g3 z6 h4 @; n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 l; u/ y$ @& v; o% B- @& K& p
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* Y! A- l. b6 L' |7 W" w0 [* w# t  l
6 m! |7 t$ e% {% t! T& S, X; i7 V
  ask roads [ set pcolor white ]
% {0 }) n$ r: ?; o) Q    setup-intersections
' _/ ~* P7 O" Send
. H2 q7 S, `: }9 e其中定义道路的句子,如下所示,是什么意思啊?! _  j2 P; G) f; k5 O* A4 \
set roads patches with: D% o, @. i7 q0 q( N: ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) }/ v( z7 C/ ^' u, Q5 X0 V# P# \, t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 A; T, z, M3 K5 C, g
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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