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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 l" u9 }! D1 s. E. u1 b8 F7 ?netlogo自带的social science--traffic grid这一例子当中,
: @/ s) S4 F5 t; Wglobals" ~, O5 p5 z$ ~# X3 `6 X" E. w
[
, z, K8 M% s' h1 V+ c& Q- M) {3 L  grid-x-inc               ;; the amount of patches in between two roads in the x direction, W3 P* U3 v& C/ \
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
7 J. U0 g8 Y8 R$ G6 ]& A: D  acceleration             ;; the constant that controls how much a car speeds up or slows down by if1 ~6 r4 G8 L. F5 c& z
                           ;; it is to accelerate or decelerate
0 x" O' T+ f: e* d! q4 B  phase                    ;; keeps track of the phase
) Y1 S% v; d- |# d: L  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" e. ]2 f7 i' i1 L- h2 _* T6 w7 K  current-light            ;; the currently selected light! b3 k/ \" S5 l! n" A. X; e

) U& g6 x9 P+ F1 ~4 ~  ;; patch agentsets5 Q3 f" s0 N  L' W$ i
  intersections ;; agentset containing the patches that are intersections
4 U; X8 W; |2 T3 C4 A# [5 P  roads         ;; agentset containing the patches that are roads$ t* h& }: L8 b# e3 S4 a
]( S1 v% o, ^3 h1 S0 N
1 }2 p7 N5 A, G# c
turtles-own6 ~- o& @  Q5 Z( t( `, ^8 T
[! _* h6 k7 d- L4 z0 N+ q
  speed     ;; the speed of the turtle$ g& B' D( N# N* T
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& P# d/ |/ o$ m5 L2 o  wait-time ;; the amount of time since the last time a turtle has moved
6 C& y) L1 l: [0 K+ v: |/ S]0 h) t$ o& {# L! b! l& Z) l4 @  \
2 Z' |3 {) ]# x
patches-own0 b$ E- a! g1 x. B0 S$ }3 k* ?/ S% Z
[
8 ~3 J# t$ T( j9 x! ~* L4 B  intersection?   ;; true if the patch is at the intersection of two roads
5 y2 f- x  r9 Y  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% v/ }# \6 j$ F, z! ?, `8 i* R                  ;; false for a non-intersection patches.# B" N( p* P* {6 p
  my-row          ;; the row of the intersection counting from the upper left corner of the2 {& b* {# `2 \9 P6 C1 g: i0 O
                  ;; world.  -1 for non-intersection patches.( Q, \! [) l9 R1 k/ Y0 e1 W
  my-column       ;; the column of the intersection counting from the upper left corner of the
0 L% S- x7 X2 d" t0 q, `; |                  ;; world.  -1 for non-intersection patches.
+ `$ s  d" n' L' P7 ?5 `  O/ n$ |: F2 y- l  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; G0 A$ z5 p/ S1 W9 l% b  auto?           ;; whether or not this intersection will switch automatically.8 Z( i( B& ~6 k  Q4 J% G% C/ s
                  ;; false for non-intersection patches." J! b4 s/ D) A; {) Z6 j
]
( N# ?) f! U% ?4 Z( ]4 B9 u5 ~" H0 a; f* _+ ?% O+ B3 Y

! T2 Z9 j# S1 k9 P6 h4 T/ Z;;;;;;;;;;;;;;;;;;;;;;
5 m1 R/ Z( w/ ?" n;; Setup Procedures ;;& W" u" w* k* @
;;;;;;;;;;;;;;;;;;;;;;, F0 h* t' ]) l9 P, c

; S0 h8 I$ Z. N# o;; Initialize the display by giving the global and patch variables initial values.
% l, t' A% l- }8 O- G, o* n;; Create num-cars of turtles if there are enough road patches for one turtle to8 O$ ]( a* s; T
;; be created per road patch. Set up the plots.% J& o* ^" F/ q$ K; c
to setup
; |' x9 Q% s+ f. Y1 |6 \- L  ca
. T8 |$ i5 T6 z% r. a& B6 P  R- Y  setup-globals( }$ J: W- c! x3 M: C
' v8 t) ?9 e) {0 L! n( H
  ;; First we ask the patches to draw themselves and set up a few variables8 _& W+ c; H. {- D
  setup-patches/ b/ `4 O* v/ \1 W7 Z& v+ M0 ^: @
  make-current one-of intersections
, V4 [( p0 \* x/ Q4 m* K: v  label-current8 C! a- R. s: @

" C" w! H5 `5 {) Z( J; d  set-default-shape turtles "car"
+ m+ U3 C, N5 o
+ z5 r: P% ^2 M* S8 V- r  if (num-cars > count roads)
4 m3 g3 y! m- T/ n" w/ i  [
) Q+ r% f& U, b! G% [    user-message (word "There are too many cars for the amount of ") g) H# y) z4 Q& t4 L" Z
                       "road.  Either increase the amount of roads "( J6 ~  C' A+ D. y
                       "by increasing the GRID-SIZE-X or "
- f$ m, @- N1 [* F# M+ {/ X: {                       "GRID-SIZE-Y sliders, or decrease the "
) b8 j  e: K% k4 z. h1 [                       "number of cars by lowering the NUMBER slider.\n"0 X" I! [8 S2 G) [0 n2 w
                       "The setup has stopped.")
, m8 R& w0 o4 E& i* T3 r; u6 J    stop
7 q' c% c$ \% H  Z) P% o7 L  ]7 G5 n' f. |( f4 i  T( |' I

! D# M' k; `, j1 T, [* y+ F7 G  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( a/ C+ ~2 X- [. N) w0 ?
  crt num-cars
, I1 h0 E' K' @3 Q: k0 k4 T7 }& l9 X  [
% r8 D4 @+ a0 x/ F    setup-cars1 E  A) X3 C9 H) f8 `2 y" w0 |
    set-car-color
: [& ]- |+ h1 L, V    record-data8 \2 y* n, }2 e- F% \$ ^* F* n$ j
  ]
% ?% E+ l& B- v% `. ]
, J- K# \' k: t" n, P  ;; give the turtles an initial speed
& j9 \" N! Z/ N  ask turtles [ set-car-speed ]! K) [/ l" y- l& `9 H0 c* ]8 R

/ Y3 }; Z2 x4 E# ~  reset-ticks
' L9 l8 d) u# {) Q3 G1 dend
7 t+ w6 e& z$ r0 O8 y) G8 C' r) l4 i/ M$ v7 X
;; Initialize the global variables to appropriate values
2 _4 w$ Y' z- z" H/ r1 f4 w' lto setup-globals4 F4 w! `& b  v# _5 x2 e
  set current-light nobody ;; just for now, since there are no lights yet
" w; `' V1 n$ b" _! c1 Q6 k  k& [  set phase 0' F# r" i2 W( r# G5 V3 q( l- y
  set num-cars-stopped 0
& }) t4 A  w" F4 m5 J  set grid-x-inc world-width / grid-size-x. h6 t  }) B9 L* ~8 J
  set grid-y-inc world-height / grid-size-y
- m: b+ x/ `( C2 }1 k3 o4 l7 H: o3 D9 ^6 X% k, Z; d$ L- T
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" o. ]- F8 N8 ~$ c. u! d" w
  set acceleration 0.099
# a& L7 ~& w$ n7 @0 V  kend+ g, m$ L( U) r$ N

; D% ?( b" l  q; k/ L* L: h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 h2 k$ B/ ]* b% |& g9 c. o;; and initialize the traffic lights to one setting0 x5 o6 O) W% n% c. O) }6 g, C+ b. e3 G
to setup-patches, ~& Y- q' s* a* ^  S
  ;; initialize the patch-owned variables and color the patches to a base-color( U  j+ y* A4 s
  ask patches
  n& S7 K' o& }& @9 g  [
# O/ k  {" \2 u, T! d, ~    set intersection? false( f2 I4 ~% o& d: x& L8 h' h5 w
    set auto? false
, e  J6 [8 @2 O% t! E: C    set green-light-up? true
, M! d  d3 _" T    set my-row -1' k7 ]$ [) x" ]1 f. i
    set my-column -1
/ E8 m- l  D+ s$ j9 x1 |    set my-phase -1
0 c1 Y  r2 i2 B: x8 U3 f0 ^) H    set pcolor brown + 30 b. ]3 x7 n0 L4 b$ f  R4 O
  ]
' M. m$ j" O5 {: W: U  W4 S: Y4 a# X+ x  B
  ;; initialize the global variables that hold patch agentsets
8 G" j# c4 ]5 J9 B  set roads patches with( K! U, |* A6 `7 d8 W6 ]6 _3 u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 z$ a( Z5 {/ z* R/ Z
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], ?  N7 q. h# O
  set intersections roads with( m$ U$ H' C' R8 t& s: O& D+ e. _" B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 s8 x" f8 n" T( [1 a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 v3 F# Y  G9 d& E; d: y! _3 q  O" ~, _9 p4 I  q5 m0 h5 \
  ask roads [ set pcolor white ]
+ r$ v* t# R; {# s+ }, `  L3 t    setup-intersections
4 O% O4 u, J7 Y6 Qend
5 @6 a8 C( N0 w* _: |3 M% K* b9 n8 ]) B其中定义道路的句子,如下所示,是什么意思啊?& n7 e; a  K) r- k( c- `- }( j( X; p
set roads patches with& u1 o3 z: V& |+ g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( D( G7 i" G. B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 x  O" m! f0 ?: ]& Z1 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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