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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。
* u7 [* Q$ G! \( {  X. w: }: r9 \netlogo自带的social science--traffic grid这一例子当中,% q  B# i6 |; |( k' p3 ]- ]+ v
globals4 l4 F! b- t% L$ i
[
) [9 ]' P" o7 F; G  grid-x-inc               ;; the amount of patches in between two roads in the x direction
' `2 Y, x: N* U4 q  grid-y-inc               ;; the amount of patches in between two roads in the y direction
  T" \& V4 S$ ]9 c" H8 X  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
0 S6 `, _5 q) A/ Q: a                           ;; it is to accelerate or decelerate
5 M/ W, M( W+ k( L- {2 u  phase                    ;; keeps track of the phase
4 u8 ?6 a/ r0 d, x0 Q$ D  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
% b" X  I- p: @) g2 t% m  current-light            ;; the currently selected light
" P. h  N" X4 W* b& J6 g
6 |* r' w) d7 m' |  ;; patch agentsets, y! x7 _% e2 a# }
  intersections ;; agentset containing the patches that are intersections
( P. F, q: G2 l  roads         ;; agentset containing the patches that are roads5 J0 b' [: u( L6 v: _
]
" I) s8 x1 \4 Z9 E0 a  U4 `3 ?# a; b8 M9 o3 G
turtles-own& J& R/ [" m( b
[
8 z7 m2 \/ j% K$ ?+ e9 r  speed     ;; the speed of the turtle2 z( M% f1 n0 K1 Y
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right( Q; f+ K1 a$ a7 F2 t) _) i
  wait-time ;; the amount of time since the last time a turtle has moved
1 M  P/ g& a: g  p2 J1 a8 S]) f. T6 o5 X2 D. Y5 ^$ v" J5 s1 [- i* \

9 L; @. ~, a( i4 Vpatches-own
( D+ z4 c4 Z3 p- |0 u3 s1 l- ^0 x[/ ]& Z3 I  n# R9 Q0 Q9 L( s2 V$ l
  intersection?   ;; true if the patch is at the intersection of two roads
5 F4 N0 [7 d% k  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. {6 K) X+ F. v3 q                  ;; false for a non-intersection patches.
. F" ?# i& O/ ]( ~  my-row          ;; the row of the intersection counting from the upper left corner of the
3 Q) m1 @& s2 K& B                  ;; world.  -1 for non-intersection patches.
6 w' f5 Q: X( r  my-column       ;; the column of the intersection counting from the upper left corner of the6 c, D+ K0 b) K8 _: a  A  ^. p; z5 d
                  ;; world.  -1 for non-intersection patches.1 x' e2 _/ _' @* ~! K
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 ]( }9 C8 K# J3 ~$ }+ ~
  auto?           ;; whether or not this intersection will switch automatically.) A4 g; _6 T  I/ f
                  ;; false for non-intersection patches.4 j) ]0 p, r7 U2 _  F& \8 O% Y
]
$ s6 g4 n9 g/ v6 x7 _# M4 |4 o$ \! y: P- ]2 K* e& A- ^) U

% X) P" r( i5 X# g' K* a; U& };;;;;;;;;;;;;;;;;;;;;;: u( C- E! j) Z6 D6 O1 [
;; Setup Procedures ;;
/ V, t2 @: A) S2 ]. s1 u;;;;;;;;;;;;;;;;;;;;;;' X5 a$ }6 a' |+ b; w* x( m

% s# X: j5 l4 F! h" X;; Initialize the display by giving the global and patch variables initial values." W& p5 W8 n) p& Z' m% ^
;; Create num-cars of turtles if there are enough road patches for one turtle to
  J. s% ~+ x5 W% c" `) W; y) h$ |;; be created per road patch. Set up the plots.
8 g$ X  B! D3 r* D+ L" S& wto setup
/ \& G7 T& L5 O$ r& h4 J2 V  ca
) D! G7 Q4 Q: n: U3 `  setup-globals; {( h6 e3 G( n3 d3 I( L8 |

  W' O7 v" t/ B% X6 `5 \  ;; First we ask the patches to draw themselves and set up a few variables
) Q! S4 a( \$ B( `  setup-patches
! V/ G5 g2 o; `6 y; b2 @$ Q  make-current one-of intersections
. `5 |' S) e: h0 m+ s  label-current$ H4 w7 S- q) G8 l0 Z+ \

. \- ]6 i+ [' Q  c  set-default-shape turtles "car"
5 g" A" B& z- ?
+ D. r3 @( q' r2 {: n  if (num-cars > count roads)
/ t; @( e4 @! T* J# J" D3 \  o5 I  [
% o  {- k0 U! i3 e- D    user-message (word "There are too many cars for the amount of "
+ g3 ~* C, k# X# ]                       "road.  Either increase the amount of roads "+ N! h8 B7 G: Q$ ]
                       "by increasing the GRID-SIZE-X or "" U4 |+ h' ?9 L" l
                       "GRID-SIZE-Y sliders, or decrease the "9 T; c& c) c( @# \, P
                       "number of cars by lowering the NUMBER slider.\n"
6 f7 {$ f/ w4 e; Z; g                       "The setup has stopped.")
+ g1 p7 ?+ b: u! j% M& ^; b    stop8 }5 m% D. Z; B( Z7 i) g6 _: U
  ]& b0 K* J) z' F# r

" l( i9 {9 M" L  n2 k  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ \" q5 I, L/ ?; H9 \; }; L3 w
  crt num-cars- N  D. G7 d6 A1 A+ _, Q2 v* z0 s6 S+ S
  [( a& l, L9 l* n
    setup-cars/ ?. o; F& w) k1 G. l
    set-car-color, Z/ G' }# [; N% Z
    record-data- A) R. B9 k7 K& f0 _3 O( e# O
  ]9 o. L4 x6 o! h  g

( F# K. |$ n. b- [7 f4 k! w) y  ;; give the turtles an initial speed( F% v1 }: p: C& ?/ I
  ask turtles [ set-car-speed ]: B- q  P. r1 I( ?
3 ]" y9 O: D1 O/ z/ ?
  reset-ticks
3 I( L8 S, S7 D. Oend% d: a, A8 p; a4 o5 t

8 U+ V- V- o. w$ G% S;; Initialize the global variables to appropriate values
% j2 r8 E  x, Q1 A! qto setup-globals
8 C( v3 ]  R+ t% A, s! x* S  set current-light nobody ;; just for now, since there are no lights yet5 s  o" e* l* _9 d% L! H" f8 n6 p/ ~! [
  set phase 0/ i% n: I; P5 V; h/ r9 \
  set num-cars-stopped 0
8 @( O2 C, f  |0 u" e: ^  s  set grid-x-inc world-width / grid-size-x
" r: K7 }) v7 u( A0 Q8 [& d  set grid-y-inc world-height / grid-size-y" E: h, U8 C$ `: e+ @

9 v  ]0 V" [+ V& G( T( @; h  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary4 X$ ^+ C" d6 ]8 G
  set acceleration 0.099; M  J* z! a+ A; Q+ ?
end% [5 V1 m* ?2 ]8 i# p
% ~# S. T2 o( U! y- O+ t1 G
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 Y% B; E" N# M+ K1 |
;; and initialize the traffic lights to one setting2 c2 m1 z. _& j+ G7 M: N& K& R
to setup-patches
2 F+ k) t. i; d' n  ;; initialize the patch-owned variables and color the patches to a base-color
- {1 S! a$ B- q+ u! Z. J  ask patches
! @: o$ P- D) N" F  [
' T' X# T0 x7 j8 z5 E1 e; [    set intersection? false, |+ G7 C0 z+ j& h8 t7 e
    set auto? false1 c* I& D, o9 ~# a5 y
    set green-light-up? true
+ W6 Q5 ~+ B6 |1 o; g9 _( F    set my-row -1
- |9 c& S- Y+ i& @) k    set my-column -1
% O3 {) F; m7 O$ s$ n2 X, A# S0 i! P) h    set my-phase -1
- d# g' _/ E# I- I6 }2 Q( h    set pcolor brown + 34 y* F( J. X4 z' p0 O/ k7 G
  ]+ N" w* y/ p& J
8 k, Z/ m6 k* P" Z0 R: [
  ;; initialize the global variables that hold patch agentsets
3 _% Y' R' I0 o  set roads patches with- O7 t5 o% F* c% @; k
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 ?3 u9 ?0 `5 k$ \. ?. d; k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  w* I6 @- M2 Q; Q% J7 y3 o6 n
  set intersections roads with0 G0 i: |% n9 q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: m$ p8 ~7 S( X0 l9 H# H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. J1 a# R- Z: {6 x$ ^, D) r$ y) X7 r) r6 _5 E+ D1 T
  ask roads [ set pcolor white ]
$ l& h5 j- L  G0 J    setup-intersections
& f# }$ C* `/ Y* W0 Z" b* ^. P3 Dend
# I; H# h0 |+ _" z# S! [, B其中定义道路的句子,如下所示,是什么意思啊?: R# H/ N3 O9 Z* x
set roads patches with, K/ l4 ?- V6 }) a% B2 ~
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' Y* h0 G* p; \% G% a& b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 v% J! Y6 w4 h. n7 A+ Q$ @; P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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