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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 H2 O; p: n) R1 ?2 M, vnetlogo自带的social science--traffic grid这一例子当中,+ t) y' |8 p( d% S$ ~0 i5 ?
globals, V% x! Q( ?4 P: U0 u" w, T
[/ q) P3 {+ `7 u+ ]5 ]& q( b
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 p( J8 b8 m. o, \1 i  grid-y-inc               ;; the amount of patches in between two roads in the y direction* ?% f' N  {7 I5 t- F5 a$ B
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) z* N8 S: r4 j! O% l! _                           ;; it is to accelerate or decelerate
4 }" u5 d7 M0 [, v' l  M7 r1 i  phase                    ;; keeps track of the phase* u& l: i2 I! G# e4 K( j$ z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" t( }& Q4 W/ A) V  current-light            ;; the currently selected light
, U- B* M% Z4 c' d# N! x9 Z( O  @( N' @) }
  ;; patch agentsets) |. H8 s8 l- O5 U, d
  intersections ;; agentset containing the patches that are intersections
- v) R' t1 \" J0 z; b) V  C, `  roads         ;; agentset containing the patches that are roads
) P% X/ W1 @. H8 Y- Z: n- H]% g! ^7 u' K+ R

4 c3 U- u* R& J8 mturtles-own
/ H9 h" E# N6 l% K; K1 H' t* K; I[  a2 R" M- N, W  Q, l7 j; n
  speed     ;; the speed of the turtle
# w1 {2 j* P$ @, l2 Q$ |  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
5 X" m! N# ^1 B8 y+ A  wait-time ;; the amount of time since the last time a turtle has moved' I, _. a: _! w/ S  }& N2 @7 l
]
) h8 @6 @- @- |* V* F
! ~% C- \# h3 Y+ npatches-own
0 J# o. v4 z/ v0 M6 d[
) L1 R; p. |8 N  q  intersection?   ;; true if the patch is at the intersection of two roads
3 T) q# _. [8 C  e  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
6 H6 t2 e, D  C. Z; d; o5 Y* ?                  ;; false for a non-intersection patches.
2 }' Q( \( {5 T/ ]; f0 W  my-row          ;; the row of the intersection counting from the upper left corner of the
% ^( T2 |0 {  E0 a: W: R                  ;; world.  -1 for non-intersection patches.
0 `' E2 o: C) [0 ~( i" b  my-column       ;; the column of the intersection counting from the upper left corner of the
( v7 ]" D0 N5 b$ t2 @                  ;; world.  -1 for non-intersection patches.
( L0 w8 Q2 u# c. q" f4 q0 p& c  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
3 c4 A- @  V) R  ^, D  auto?           ;; whether or not this intersection will switch automatically.( u# b! M3 B1 L7 Y
                  ;; false for non-intersection patches.- o! D: N. J+ q  N5 z9 w
]
2 T; ~$ @# z, X! G$ y0 }5 J- p/ P! c& y$ D: Z# G

; M; r% X. U7 _$ |( F" W;;;;;;;;;;;;;;;;;;;;;;+ |+ @" [7 J  M$ A7 {" u9 ^* z
;; Setup Procedures ;;: \9 K7 ]( Z* E, \
;;;;;;;;;;;;;;;;;;;;;;. w3 O% [! ~8 |4 T0 W1 E9 t

: k1 _- d/ G6 ^;; Initialize the display by giving the global and patch variables initial values.5 e' k! g8 t/ j
;; Create num-cars of turtles if there are enough road patches for one turtle to4 C8 C- E. g" E$ D* _
;; be created per road patch. Set up the plots./ ?9 [( }: o) U2 e" b
to setup4 h; F/ ^7 s$ C& ]0 D0 Y% U1 ]
  ca
7 O7 R+ T2 M0 i, p+ g  setup-globals5 ~; ]! M8 n: B5 Y

: [9 [1 k: a6 m. J9 U1 f) y  ;; First we ask the patches to draw themselves and set up a few variables
6 O' p" U" S, l  setup-patches$ k2 z2 s8 B: s
  make-current one-of intersections  K8 r8 \- I3 j) ^9 A
  label-current
+ }  D7 I9 ]# b! k6 p: ~: y  _8 e8 g- P( h! Y) o
  set-default-shape turtles "car"
+ p3 w( ~* `3 S5 m/ Q# J* F# z! ]& _, Y) K
  if (num-cars > count roads)
8 F& P2 N* O7 i. T% A  [; p3 s, q) i* M& \4 R8 {1 I' m8 P1 h
    user-message (word "There are too many cars for the amount of "
# |5 [2 F- g3 G/ w                       "road.  Either increase the amount of roads "
; U7 L( O5 V2 F0 ?& G                       "by increasing the GRID-SIZE-X or "1 j8 B9 T6 ~# [$ O" t
                       "GRID-SIZE-Y sliders, or decrease the "" z# Y% w  V6 I7 F+ J, B
                       "number of cars by lowering the NUMBER slider.\n"
. @2 W( {0 k0 f8 T                       "The setup has stopped.")
8 t7 n2 {' [' o$ g# s& q    stop: w& G1 u* C$ k+ c" M2 H1 f# n8 |2 P
  ]
2 Q# ?" U8 [" S4 f: i) Z: Y
. m" B4 O* O! c( c  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' q4 E' N. A& ~- f- y7 J  crt num-cars
# o# T6 E  S$ x. y  [; S& i: [' G" u; E# X
    setup-cars
) @; a1 f9 S4 }* [    set-car-color# j8 `( y$ a' a
    record-data5 L2 l/ _2 j( E# N/ @8 e
  ]- a! u- ?( t: ^

1 q& k& p" L$ m9 }+ F) a; J8 P% B  ;; give the turtles an initial speed0 m8 B: m) Z3 |- {* v" P2 P
  ask turtles [ set-car-speed ]
: e% z1 s9 v3 s+ C$ l: [
- S+ b' D9 u; ^( b! N  reset-ticks$ Q" N) P+ W% v' _) M9 l2 T5 H2 W
end
1 q) }0 k) y) a( c- @: X3 n5 V: R, ?$ |) G0 h; P- E  l
;; Initialize the global variables to appropriate values
0 p  F% B# B7 N4 B) V8 kto setup-globals; ]5 D2 |0 N$ O  B! @, D5 G
  set current-light nobody ;; just for now, since there are no lights yet
# f7 R* ]  m+ t5 z5 p/ I+ ]; L6 a$ R  set phase 0
1 K* j" i2 V' F2 w8 Z$ B  set num-cars-stopped 0( z+ s, _8 E% S0 g
  set grid-x-inc world-width / grid-size-x3 u+ N& h( h$ p# l# ~: `, O$ ~
  set grid-y-inc world-height / grid-size-y
7 B3 k' z! w! x" i  d1 e* G/ p% E+ y. E- B+ [! ^5 l
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
% l9 p6 Y, `/ `) n( Q. }  set acceleration 0.0992 D( q! e' }0 R; W5 d+ T; D. r
end& V% v+ o8 w" X7 j7 A7 l

3 K3 R9 G7 ^  Q  m+ b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( T7 z# b+ w1 u8 N7 _) l% R. V
;; and initialize the traffic lights to one setting
9 `1 G+ i7 P+ Z' Jto setup-patches6 Y: |! `3 `4 m
  ;; initialize the patch-owned variables and color the patches to a base-color, V  B9 C6 Z; ~2 p
  ask patches
* I0 ~; F$ D7 q$ e' |. j+ B3 p  [+ R8 t' v% W$ {8 I/ S2 _
    set intersection? false
( y. O' L% `" o/ d& \3 A$ K5 y    set auto? false, s* M* U+ O) H; G. p
    set green-light-up? true" M3 O4 }& `" \( ]+ b
    set my-row -1
# C8 q, F  e+ y" D, A  c+ e    set my-column -1
5 ~( ]- C2 n- @" t4 s    set my-phase -15 z& E  N! U4 p( o
    set pcolor brown + 3
( y/ u4 w* j. L+ H  ]
  b- l+ @, A1 o0 `  D" w! g
5 N4 y2 R2 ?- r1 e" l/ Z  ;; initialize the global variables that hold patch agentsets
* u, O: E9 D/ h+ z) v! G% n  set roads patches with* r/ H9 m" i! U9 g# ]$ v0 j" r9 |) C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- [/ V( V) Q3 r( p3 T4 i0 h) r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 s9 ~& `! ~% c3 K& q
  set intersections roads with
0 y5 p$ k1 {; c& B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ e0 b! Y2 k2 ?1 N7 a0 T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 Z! G6 _$ a* ~2 S, W# @5 w2 ]
  `" B" h8 m' G! u: n% T
  ask roads [ set pcolor white ]
# k3 z/ a0 e9 \2 G6 g" _    setup-intersections
, m% m6 Y; U1 fend1 p2 g2 l6 Q  G8 U) z* a7 U
其中定义道路的句子,如下所示,是什么意思啊?
: l; Q7 R, r8 C; J% l9 @+ |7 _# D: C3 G set roads patches with
: t! o+ n0 w% E2 w6 v    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 r7 f" q7 b* P" o0 q* W* U1 m4 S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 v9 O& K% y# C8 v  @, I7 {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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