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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。
' J2 N/ E9 F3 ~% Pnetlogo自带的social science--traffic grid这一例子当中,
& K. [' A2 f( d7 aglobals
* ~: Y) o# U+ Q8 F" R9 P$ A- T[# f% Y$ N7 e/ ^9 J1 j
  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 T9 j; m% ?4 Q$ y
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# [4 w5 N7 s' d: L6 H7 ~- K3 d  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
( m  o( @+ p  b/ y                           ;; it is to accelerate or decelerate! U. l  k& D! g5 H  X
  phase                    ;; keeps track of the phase
. a* _/ f0 u$ \$ ?6 w1 R  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ X6 i1 _! S% H# o0 D) D  current-light            ;; the currently selected light
& K* C' _9 ?' F, w1 F
: P  D1 @7 O- b# U8 X  ;; patch agentsets2 w4 {) @, i4 b" p
  intersections ;; agentset containing the patches that are intersections
* l4 Z! R8 ^9 ^/ H) @  roads         ;; agentset containing the patches that are roads1 J* ]+ B/ Q6 x7 @
]
6 V3 _4 `( j7 X( _9 J  y/ g
! a, Y& t7 e& |  Q: Xturtles-own
& v: {( T  ?( _% ]3 p* ~[9 {% L+ ^# @$ ]
  speed     ;; the speed of the turtle
; k( x( V" X: @  e1 ~0 N& {  up-car?   ;; true if the turtle moves downwards and false if it moves to the right% F( w; w4 o% ]( z
  wait-time ;; the amount of time since the last time a turtle has moved
8 R7 T: g2 G9 b# X- G4 ?9 v9 z% I]4 E8 |: r3 |+ D
7 ?% N& R% T2 I# O. k2 D
patches-own
# [( B7 E' e7 q: Y) }; L$ ]  C8 M% I[& _; c: H  V, _/ b2 t- r* ?
  intersection?   ;; true if the patch is at the intersection of two roads5 {/ p7 q( B4 A6 r+ b
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
# k& v* F5 A7 X& M0 f( G& y                  ;; false for a non-intersection patches.+ v% m/ j" l" F) ~
  my-row          ;; the row of the intersection counting from the upper left corner of the, S1 }9 c! p; {7 J6 S$ W
                  ;; world.  -1 for non-intersection patches.
) K  t: m* `: l! @, f4 Z, U  O  my-column       ;; the column of the intersection counting from the upper left corner of the
/ S; b1 C6 f; V$ E) |" g                  ;; world.  -1 for non-intersection patches.) y8 y9 U; Z3 _2 S( c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.6 I  v1 Y- ~. ]3 N
  auto?           ;; whether or not this intersection will switch automatically.
! t2 U' j* X; S" `4 Q1 C                  ;; false for non-intersection patches.
$ K7 Q$ Q$ s$ d( V]
, W4 ?* `7 D3 D  C$ h6 z# {, X" B6 S/ O. k

- v. ?9 T" a; t+ P;;;;;;;;;;;;;;;;;;;;;;
9 y$ ^! ?3 x% y7 r;; Setup Procedures ;;% z2 l% ~5 `# h3 I
;;;;;;;;;;;;;;;;;;;;;;! }1 \, m" v8 P1 Z, i1 x) M8 K

9 b  P9 h9 m) I: Z;; Initialize the display by giving the global and patch variables initial values.
3 n2 ^. M4 L! k, k5 B( J;; Create num-cars of turtles if there are enough road patches for one turtle to
; |: i6 U  A. d, t4 L1 b! Q- d, S;; be created per road patch. Set up the plots.5 n; z! I6 J9 ^, {, |& k5 v
to setup
: g8 L. `7 \. C. e! x* ^  ca
6 @% h- w8 T) }/ s/ l8 a3 @  setup-globals
0 m" K/ |: W0 d, C6 ]; A
2 @0 s/ ]; H3 C( W  ;; First we ask the patches to draw themselves and set up a few variables) T9 B% Q7 C: P( p
  setup-patches5 l4 L( O& R) V1 B- U7 m8 j' p
  make-current one-of intersections
1 [- z0 Q9 _6 X: _) C0 L  label-current
" w& e' W# [/ |$ z8 l% q5 z/ p0 X! p
  set-default-shape turtles "car"5 h& C* k1 B" W1 I

" A; ?; K. ?3 ^  if (num-cars > count roads)9 @* u1 y" n% k& v* s) a( ?
  [1 T  i. Z. y3 ?, N" C1 P' w
    user-message (word "There are too many cars for the amount of "; G- i( O* D8 T4 d$ {6 ]/ M
                       "road.  Either increase the amount of roads "7 h/ M: n3 S4 }" C
                       "by increasing the GRID-SIZE-X or "
  D* I3 s1 U/ V* w0 x                       "GRID-SIZE-Y sliders, or decrease the "
4 ?5 Y: b  t, w                       "number of cars by lowering the NUMBER slider.\n"
. c6 M1 a2 N8 e, d; V' O                       "The setup has stopped.")
" \) ]3 B. {( M/ I% v" r# a    stop  n/ W( ^. P! G7 U
  ]
4 x: W' w5 q% M" h
$ S( V3 a2 {" K  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) a- e, }% p' c, L2 ]& u( b: y
  crt num-cars1 n8 c5 _$ c, R
  [. k0 b& C8 K- E- _' C( V; T
    setup-cars
6 ~" T# B3 M7 t1 T6 i0 g    set-car-color$ W/ ]/ p1 O, y' Z" s0 r; S
    record-data
# j0 \' m9 E3 P4 B& T' i  ]
- [2 a/ K% ]0 ?7 i8 t- J) v0 ^3 j; N, q+ y* D: v. A7 i9 O8 f$ O5 b
  ;; give the turtles an initial speed
! A) s( K0 u- F1 W1 q/ q% R5 U9 h  ask turtles [ set-car-speed ]
  k9 X& I' Q2 a0 G6 G& Y
7 \3 b# V$ ~4 G. D  reset-ticks
4 R' |8 [% U7 s& `- ]+ j. `$ nend
- H7 m# y. Q$ N& Q2 r5 V: l- E4 }" R, u& j' v
;; Initialize the global variables to appropriate values
, R& V, z6 B% r" o3 }2 xto setup-globals% w7 l4 s, _8 {$ _
  set current-light nobody ;; just for now, since there are no lights yet
0 g  Q8 {* Y. M+ R" H, z  set phase 00 c: g6 X9 |' i7 F9 }; ^5 A+ w
  set num-cars-stopped 0
+ ~: V0 o6 x  b  P: k+ d8 W6 v- r  set grid-x-inc world-width / grid-size-x
: O+ N- `) K3 w9 g0 {  set grid-y-inc world-height / grid-size-y
( U' `1 j5 F4 ?
$ \2 C2 x/ Y7 H; {  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( M2 z5 C: }; B( ?  set acceleration 0.099, e# |( M9 Y9 ~" i% |, k4 P
end
* x2 w$ g+ z  @7 ~0 c& U0 E( l7 u7 A9 D' _  r" m2 M
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* B2 e0 }1 A. ?8 ]1 D) I. }+ [; o, b
;; and initialize the traffic lights to one setting4 e) O# S9 E8 s9 h) u3 k% p$ C
to setup-patches
& b+ h' N4 h1 z; @" H) k0 E( o& K  ;; initialize the patch-owned variables and color the patches to a base-color
# [8 y2 H. A# a+ l  ask patches# A( ^. ~. I- C: I% T! F5 }
  [- {2 X1 ?. D/ a" n; R
    set intersection? false, t& H: H1 W% J) Y8 R) }( G, U
    set auto? false6 g; U% Z% B6 S4 ]2 D: K1 n
    set green-light-up? true: T* b% _  j1 @% `2 J" P4 J
    set my-row -1
1 S$ h: w5 X  F    set my-column -1$ N- R7 ]3 A5 l7 ?% j
    set my-phase -1
/ q" D0 O5 B  g6 G    set pcolor brown + 3
) e+ z, o0 S2 ~; h* z7 X9 }  ]
* w: ?2 F! R5 |6 }- ^6 q: O6 d
/ |$ ~, o% S  B% W2 `$ @% Q: H  ;; initialize the global variables that hold patch agentsets/ Z; @" _5 S4 U, Z4 t* Y* h
  set roads patches with' P' s7 c% A# P. S+ P$ z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 ^) b7 S) @8 k/ V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# U) ?" |, S- z' p2 d
  set intersections roads with  d. P; F; @* Q+ f% h
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) J! a- N, q* v) |) H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ u( w7 G3 H* M: b& p: \
( x. _- c3 f: C* t4 g4 K4 K  ask roads [ set pcolor white ]) G' b$ b" M" d
    setup-intersections
4 a3 j' V% A2 z, Hend7 v1 a$ K/ X: k$ ^- a' N
其中定义道路的句子,如下所示,是什么意思啊?
6 \& i! g+ m- B5 v: K# l" O0 Y" Z set roads patches with! ^$ `) A9 Y6 r3 Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# Z$ l/ U7 l* T' G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 h2 @% n- w1 J& l1 _4 {  l
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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