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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 [' f) ?/ i8 A; z; Rnetlogo自带的social science--traffic grid这一例子当中,* w+ P* I8 v  @& r) A! ^6 h$ Q
globals5 @) q* Q9 h# b; _# y0 G
[
! l6 [6 L3 M/ g' }" K1 `  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 B) A( S! h/ u- S, B) u
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- _6 q6 A! N, E! V  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
4 l$ T; w8 X9 i% F9 \, ]- ?                           ;; it is to accelerate or decelerate0 q3 B, D" h$ T1 f& A8 x9 O4 v
  phase                    ;; keeps track of the phase
7 y' x9 \# T* f9 b. L- O  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 l& Y* |4 e1 |* i  current-light            ;; the currently selected light9 R9 Y! y: u5 d, e0 w7 Y
' H0 ~# q: H8 J3 a" R
  ;; patch agentsets" T; G1 M3 x# _- g+ b
  intersections ;; agentset containing the patches that are intersections
6 M- R  L' ^& M* P: Z/ D3 _  roads         ;; agentset containing the patches that are roads
- m' w) X# j2 A( S# C* k, Z+ w]
' c( X1 p' i) `! P8 r: C) [# y( C! {  p
turtles-own9 N; U8 |, I/ D0 e/ ]0 |
[+ J! e) m; |9 s: _8 v4 |4 J, F
  speed     ;; the speed of the turtle. b4 j) P; d3 V$ B+ i4 h% ~2 ~8 g
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right2 I' u- m7 \' P' L/ T4 Y0 a( \
  wait-time ;; the amount of time since the last time a turtle has moved. C, @7 u1 n$ K# g) s0 L
]
( W2 q2 G# k' \) E' p- R; _, a0 R) j0 y
patches-own6 h8 v0 {& d2 q' H. v
[
0 K8 o) m% z) _* i  intersection?   ;; true if the patch is at the intersection of two roads, ]4 S. Y: n3 m6 S  _/ Q% `9 w
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* [- `1 i4 w1 Z& ?                  ;; false for a non-intersection patches.2 Z  t/ g& |3 I( V1 g+ ~
  my-row          ;; the row of the intersection counting from the upper left corner of the
- j; D7 q- p) R6 |' B4 Z" V% v                  ;; world.  -1 for non-intersection patches.
& }8 N0 h( y6 X! ?: |  my-column       ;; the column of the intersection counting from the upper left corner of the/ m6 H' \) f* y* Q
                  ;; world.  -1 for non-intersection patches.
, }, \# U9 a* e7 @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
6 Q  o$ O+ G! Y4 n1 m" b  d& x' f  auto?           ;; whether or not this intersection will switch automatically.
1 K/ W6 P$ b+ b4 `: u                  ;; false for non-intersection patches.# F8 y0 R: |, b6 t
]3 |0 P/ a' h9 ^; k
3 J7 R2 h/ p: w( ^  T0 v

1 A' [: l# e& G7 G;;;;;;;;;;;;;;;;;;;;;;. T* p1 B2 Z$ i
;; Setup Procedures ;;
5 [  t; n! e" G;;;;;;;;;;;;;;;;;;;;;;4 X! E/ o+ _4 E+ q& i) h% [

0 a: r( }( }# i  O- i' b;; Initialize the display by giving the global and patch variables initial values.
  _6 j( f$ X0 a0 I- S;; Create num-cars of turtles if there are enough road patches for one turtle to% h- Y: c, w: |8 i# u) D
;; be created per road patch. Set up the plots.. `/ W+ R# Z  }  Z' K7 g
to setup
4 Q" @& ]' T' ~9 h# V  ca
$ k% ]) |: K; e" l2 T  setup-globals; m$ C6 _# Y! ~- `$ ]* d1 {( d
( r' U: T" K6 w+ D
  ;; First we ask the patches to draw themselves and set up a few variables
6 `! C7 p2 M# Z# ?- x  setup-patches
% b* z: |: A/ d  make-current one-of intersections
8 ^' Q* K! {& P1 X* i  label-current' [) Y  j  d4 W; M1 [, i
6 [& [6 D' _5 {9 _2 q
  set-default-shape turtles "car": U: B$ A5 s, _1 {$ U# C+ l- _

* Q  P5 h. C$ ^4 R& h  if (num-cars > count roads)/ F# b2 [, Z* U1 A( x. ~2 z& n
  [% s7 \, ]  ?) g3 d: a0 C/ u
    user-message (word "There are too many cars for the amount of "
! q' t" p; N# {( Y$ ^                       "road.  Either increase the amount of roads ": ^. F: R* f' q2 H
                       "by increasing the GRID-SIZE-X or "
  F5 [9 p  ~$ v2 w1 z                       "GRID-SIZE-Y sliders, or decrease the "
0 Z4 J: p9 s- E7 t( l$ t+ l                       "number of cars by lowering the NUMBER slider.\n"( y) D+ y( |; q1 Y$ `+ O) |
                       "The setup has stopped.")
; S+ Q- q$ \% M: \7 J' @: o8 w    stop
4 H9 c! L  B' t5 q. I; E  ]
% ~3 ]8 f0 V' Q4 A( j2 z3 Y
5 v0 R0 }9 I1 F+ g  N  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& o# x' t( R; Z- P3 @: H
  crt num-cars! b4 \+ ~) `7 l  R: d
  [
' U7 i! C7 v( ?+ @    setup-cars  X- M% o, m) e! r* |* U
    set-car-color0 E4 ~. O3 e7 d# ?3 b! ?" q6 L
    record-data
3 F$ @8 @3 i3 r  ]- B; H' r7 V0 @- u% O
6 E; H3 ]9 U% F+ N5 q, f. c
  ;; give the turtles an initial speed
9 `8 f0 K/ b# }6 \; _3 {5 `! p4 f7 M& w  ask turtles [ set-car-speed ], _1 m1 Z6 A' x

. z6 I; j% G) p! z' ^  reset-ticks/ E! a3 z5 _, ~  U$ c! s6 d% t( }2 C0 J
end
1 Z* a2 N/ [" J6 Y
" @5 @6 L" i: G;; Initialize the global variables to appropriate values
& N/ [0 x5 B3 Z9 A/ Oto setup-globals
$ d  U  H' X9 }. d1 M  set current-light nobody ;; just for now, since there are no lights yet6 g* w) J4 k+ q7 W- v
  set phase 0
) q( U. F1 n9 o4 f' C7 Z  set num-cars-stopped 0
; E* S/ H) W$ ^8 b: V  V  set grid-x-inc world-width / grid-size-x3 |- R( Z* U+ k* ~/ T6 `
  set grid-y-inc world-height / grid-size-y% z9 x( Z# d4 T$ @" M5 A( s6 {* B

1 f2 }" n) S! l  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! j  c- O4 X$ e8 L& c# B& U7 |  set acceleration 0.099. o, y% r7 X* s$ V% ~: n. T+ Q
end' o8 t( S7 ]6 p- u  p* H8 I

; x2 @7 P$ `. B! M) c+ @9 D. S;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ w1 Y; S# y! V;; and initialize the traffic lights to one setting
3 W) c# s: Q) d2 O* Lto setup-patches0 J* c0 Q& A0 ?. J( [" A! c, z
  ;; initialize the patch-owned variables and color the patches to a base-color
( _: K5 o4 @' R1 u! n* e  ask patches
- l% }# p, s% C  [6 `$ U; y0 |9 \" I
    set intersection? false
2 d5 i( C( [5 d$ z; h" ~. c    set auto? false$ x. S! f0 J  W( y0 y. `: F
    set green-light-up? true" \1 J$ Y9 }/ @! [! O
    set my-row -1
: w5 k: w- S& I0 e* q* U" S! x    set my-column -1
/ B7 a  W1 ^. p% H0 T! y6 D2 q    set my-phase -1
! M- z6 P' m( n2 _; l$ d" ]    set pcolor brown + 38 Q. {0 i% m$ F1 M; n  c
  ]
. n' }3 n6 i- E7 `$ ~0 n, |9 r2 y" K; E# j
  ;; initialize the global variables that hold patch agentsets  M/ }/ H7 f' M. F. `: ?' Y
  set roads patches with
% L, j/ V* D& N. N4 j- T. Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 U- i0 C* y7 N0 w/ ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 L0 D0 G# k( e. e- b6 a. z2 B
  set intersections roads with, h, w! m5 o& \8 k8 d
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# [' U# H  z& K: I" i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* R6 z( y; {7 |  i: x/ t5 _* X6 q  ?' p+ J- H% K$ O: e4 F% o- A
  ask roads [ set pcolor white ]- N# u4 d# t7 Q
    setup-intersections
8 ~( |3 |; e; a# R% Dend
1 y( a8 `/ l: V" y0 F9 L其中定义道路的句子,如下所示,是什么意思啊?
0 a) `' S% Q/ w  @. k set roads patches with
+ N& P3 x5 G5 L/ p  }7 b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& B+ y# `, A( d  v! y. h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" F2 \: Y# |& 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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