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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。
6 ]! U: i5 `6 r! f% ]  g* Pnetlogo自带的social science--traffic grid这一例子当中,! k% o6 D; C# p0 r3 x& g; P
globals4 D% ^2 S- M6 z! R* i' Q
[$ {- w7 [' `6 r! |* f5 h
  grid-x-inc               ;; the amount of patches in between two roads in the x direction; Y/ H- p& B' s! e1 x
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
; V3 i$ Y, t# p9 d- C1 a  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, V4 u- h9 d' C9 b- b# T; o
                           ;; it is to accelerate or decelerate/ {; P- I- F3 ?& C+ E- l* l
  phase                    ;; keeps track of the phase
) y+ P- f' a" f* |# Q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 x" u) t) A' D, j9 K  current-light            ;; the currently selected light
, {" j$ z: r* V3 R+ n8 K7 I9 L
: v+ g  `, t6 ~6 q+ ]; V  ;; patch agentsets
& _; K8 Q2 C# d  w: j9 P0 N- y. C' r  intersections ;; agentset containing the patches that are intersections8 U3 ?/ R  C; I0 O! H1 c
  roads         ;; agentset containing the patches that are roads
# ~6 W3 Z5 ?  r]
: v8 p# S) U: y! s
4 D# t, r( v3 L  gturtles-own4 J4 i, ~7 X: G" [- L9 h* r" I$ z) ]
[
0 b5 D* n% M6 S) a! i/ ~6 @( J  speed     ;; the speed of the turtle7 P: c- k$ v+ t- S3 D6 @
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right9 @% |& f- M  S
  wait-time ;; the amount of time since the last time a turtle has moved4 E0 `7 f; p* }
]& u  e0 {( Z* I, x/ @
2 @! I% h/ \, f- Q7 E) N+ W; w' ]
patches-own# v4 v. t2 T! S  N) C8 I
[
, R. h+ \! Z8 {2 t2 |* ~( z1 M  intersection?   ;; true if the patch is at the intersection of two roads
( ~9 r; X% J& T4 m* z" X0 U  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% e" Y/ |3 E7 {/ _3 O9 x' w. H                  ;; false for a non-intersection patches.
* `& d! c# m' B* @$ k1 R  my-row          ;; the row of the intersection counting from the upper left corner of the
& ?* r# m1 Y$ c+ b. [2 D                  ;; world.  -1 for non-intersection patches.4 ]/ O2 p+ O5 [/ Y" T4 x
  my-column       ;; the column of the intersection counting from the upper left corner of the8 R2 x" E5 d0 L5 p5 U& @' \
                  ;; world.  -1 for non-intersection patches., ^% X- ^7 S- I! v
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
" S9 u, q$ E/ m  auto?           ;; whether or not this intersection will switch automatically.1 _' E  h+ ]! A+ P2 a- z
                  ;; false for non-intersection patches.
  @; O. [5 ]* ?]4 f  @( [8 a8 G, X
" J! h+ w% _# [) p- [
7 {8 t: [# f. ?. p, o' u0 X) E
;;;;;;;;;;;;;;;;;;;;;;0 J  H4 z' c! f4 J3 k4 b
;; Setup Procedures ;;
4 y* O' t! p( C" W- v$ y;;;;;;;;;;;;;;;;;;;;;;
+ H9 W: q4 Q7 q
% g6 x. F8 h. N& O2 q3 D;; Initialize the display by giving the global and patch variables initial values., B& p- q4 H" `+ U
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 t" ]  X6 [' {;; be created per road patch. Set up the plots.
3 D# x) T- p8 g$ Hto setup
' w4 A+ n* G: Z. G. M% X+ Q  ca# ^$ r# k: s8 G* F6 I+ r) I* ^% F
  setup-globals# G5 `' ~: U( X9 p8 a

4 ~! h8 l/ o. W6 `" ~  ;; First we ask the patches to draw themselves and set up a few variables& l# I$ i( ?0 k$ ~6 Q  J
  setup-patches
( c, u. S6 i8 V$ r  make-current one-of intersections5 U6 j$ H% v4 W/ g
  label-current
2 }4 _; T5 `  G' z8 m
) Q. R4 n+ P8 C" ]  set-default-shape turtles "car"8 A; p5 Y3 z6 z6 R3 R" t
+ a( S5 M4 |3 H2 z4 x- k; S
  if (num-cars > count roads)
# C; v2 W  ]3 e, _$ h5 r  [/ \4 m; H% E' K5 e; B, E
    user-message (word "There are too many cars for the amount of "
* q! Q9 ^) I8 A* K. u                       "road.  Either increase the amount of roads "
  p4 f' L5 z1 D* e+ @; S                       "by increasing the GRID-SIZE-X or "
) P) C/ I+ K. a2 J) m                       "GRID-SIZE-Y sliders, or decrease the "0 v% w% K+ K" ]( [+ f, V' a( |
                       "number of cars by lowering the NUMBER slider.\n"% i7 |5 R! }6 @' R- n, I7 S/ ]( @
                       "The setup has stopped."). v+ }) }$ q. N3 u8 |( x4 U
    stop
1 s- V* {" W: u  ]) @3 ~4 b. `9 D1 ~

% O7 U4 x) h+ n9 t/ ?. j  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* N1 u4 A. p0 W  i4 a: d
  crt num-cars
6 ^' O0 Q" u: z$ B% k: g  [
0 ]2 h0 f- B, ^    setup-cars. W% d  C2 B9 l6 F
    set-car-color" B1 z1 ]# u; `1 |' Y( @& V
    record-data
0 F. v& ~& f, L" L2 C  ]
- G, J( m# O3 |- y+ x% ~
2 v2 _9 S  P# Q4 [4 X  ;; give the turtles an initial speed
9 H* J9 C: Z7 t( k2 _" b, H) u  ask turtles [ set-car-speed ]
- @' F4 R) T& O4 \3 K4 ], c! a! W$ n6 K
  reset-ticks
% d$ X! N4 F- w" oend1 U4 d( A( R) _1 P( [

0 F8 s- C  c" q, x$ L( }, i9 w;; Initialize the global variables to appropriate values6 M) x1 `! g- |* Y- v$ B
to setup-globals* X0 S' c* O# O9 s' u* S
  set current-light nobody ;; just for now, since there are no lights yet
  R* L5 G* Z6 u/ Y: ^( x9 M5 |  set phase 0/ ]" ~8 Y7 B7 k/ b+ {4 M/ y$ |  b! x* ~
  set num-cars-stopped 0
4 j% G! O/ u/ G; Z! h2 v9 \  set grid-x-inc world-width / grid-size-x' L1 C! g1 d; I) p
  set grid-y-inc world-height / grid-size-y$ q. c, V8 d6 _- v  k
1 H# u  O7 b: x  L6 {4 v1 y
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. ]0 x' y( H# a8 \: @5 [! Y
  set acceleration 0.0990 d+ \+ P2 f3 H* Y# n3 g
end/ C# z8 _" p5 D$ _& A# ]

: b6 Z. f( j& ?;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 P* H; A, t" B0 b( l  v, X;; and initialize the traffic lights to one setting% ?- E/ ?& ^" s; v+ p3 |$ n
to setup-patches
7 R1 g* l6 u- M) e& s  ;; initialize the patch-owned variables and color the patches to a base-color. J: d5 Q. A, B3 O# o, {0 O
  ask patches
* ^4 V$ r0 Y( p- \- G" d$ Q  [
8 y& m+ h. I0 y! ~* j    set intersection? false5 |1 W; e* I; K" Y% N5 }2 C, r9 e
    set auto? false
4 h3 _; b3 }* q4 ]6 T0 e    set green-light-up? true
- o7 q* J1 f# l0 K  |8 B+ `    set my-row -1
+ Y  n/ W! f0 @& ?+ ?4 d    set my-column -11 S+ M; z+ X3 X8 t) G
    set my-phase -1! K9 ?5 H, j6 r5 T& V
    set pcolor brown + 34 N( p  L# O0 i6 k' [' f
  ]) _# ]% W1 n6 ^+ z# v* D

7 C# ]: g, |: i  ;; initialize the global variables that hold patch agentsets1 K8 f3 \% {& @4 M
  set roads patches with
/ X* V" W- {" j: o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ |$ L% h& z- n; ]" B* x% a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; A4 l0 x  H# A' j% |1 N0 N  s  set intersections roads with
, q- T* R6 g! z) e- R: X2 d. z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( ~0 ?- ]7 F9 |! P# S5 Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% F1 y( J# K0 l6 K/ y6 u7 b, M/ s
  ask roads [ set pcolor white ]! o1 a& l' }, l0 U
    setup-intersections1 s2 y% U& q$ K' _# ?
end
; y1 ^- }' c! T! Z1 y其中定义道路的句子,如下所示,是什么意思啊?! r$ ^( d% @' n6 k4 Y, v; F
set roads patches with
- \  }) x: N1 Q0 t    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 A0 [  K  d- X9 s& g7 s    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( Q- V2 Q/ R5 N0 k- d
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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