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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。; U# {1 l/ g+ m1 T- ^. C
netlogo自带的social science--traffic grid这一例子当中,7 {/ U8 w; j5 Q
globals
# B" Q+ }  O$ ]3 |1 V# C, H% _  o[: D& P+ b+ N! Q: h1 a) E
  grid-x-inc               ;; the amount of patches in between two roads in the x direction1 ^# I& Y% m" m: {, p$ m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
8 b) r% P6 R( g1 c  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: L9 v' Q7 E% d1 H                           ;; it is to accelerate or decelerate9 G% _9 r3 E; ?
  phase                    ;; keeps track of the phase
* K* h8 k- d) i  T' b# J9 j0 i  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
' R  I% M; J6 d9 u  current-light            ;; the currently selected light' ^/ A: A; Y" q4 d8 Y# E2 W
8 |& `8 K6 Q" R- B: x4 e; l
  ;; patch agentsets8 j( Q! B/ d& F3 N
  intersections ;; agentset containing the patches that are intersections! {  e7 z7 G6 ~" F; [) W
  roads         ;; agentset containing the patches that are roads  e8 u4 ?& R1 e) ]9 l/ g5 n
]
+ |1 Y8 m( Q9 X+ ^: K* |+ E
) F" Q! x- l4 hturtles-own" Z8 [# A0 _9 W6 B: c& `* t  y
[* b" H" r+ x8 j8 ~
  speed     ;; the speed of the turtle( _; Q% A1 ^# b3 E. Y
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 }5 M& @& D7 p' z  V
  wait-time ;; the amount of time since the last time a turtle has moved
5 n0 j! D0 M6 d% @3 l. k5 `]
- `' A, I. ~  J. S2 }' f
% I( h! T, ^+ p. ~patches-own* A2 C: S( ?' e* t
[. Y6 U3 V- H6 |5 \# j8 T6 t  k
  intersection?   ;; true if the patch is at the intersection of two roads  w" |! O1 {1 Z. Z8 [+ U8 O
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; c6 W' O' i$ R# o* ~" S( C' H
                  ;; false for a non-intersection patches.
3 r( }* T# E- g3 U8 f% c  my-row          ;; the row of the intersection counting from the upper left corner of the8 o/ b" D& l" g
                  ;; world.  -1 for non-intersection patches.
; K& x/ @$ S. N8 [  my-column       ;; the column of the intersection counting from the upper left corner of the' `/ H. q/ c' I/ p  M  S, m
                  ;; world.  -1 for non-intersection patches.
5 Z+ _% f2 F( R* ^% L( I  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ i# Z9 W6 Z& i$ V4 I  auto?           ;; whether or not this intersection will switch automatically.
/ G5 B/ k% h2 ]3 D; r                  ;; false for non-intersection patches.
2 l4 ?- g( _' U. L]
6 c6 `, Q9 K, ~2 k- n' d  o! x" g7 O
" G7 S) Y4 w6 Z7 F3 w+ {/ Z
' P+ ]; q4 s: G( t" @;;;;;;;;;;;;;;;;;;;;;;
) y5 j' |3 h$ H) [3 m;; Setup Procedures ;;
4 ?. W- ^; K* u8 X* f;;;;;;;;;;;;;;;;;;;;;;
6 X, o+ t# P0 k: ]5 N) w) {8 G: |0 A- w2 g# b
;; Initialize the display by giving the global and patch variables initial values.9 W! _+ v; [. E$ G2 L( S
;; Create num-cars of turtles if there are enough road patches for one turtle to
8 N5 _. {: \* U2 F;; be created per road patch. Set up the plots.- y; J+ O; I& Q0 p
to setup
- V" y% i( a/ n; ]  K7 @. Z  ca
( t' h0 `2 S: q& O; z! p1 f1 ?" c  setup-globals
+ q; @. i% N0 c# j2 [  |/ K! c. H: ]5 l
  ;; First we ask the patches to draw themselves and set up a few variables
0 l) \, z' ~& r  setup-patches. n% T% X: P+ [. b
  make-current one-of intersections  y! w. R  U0 J
  label-current6 D3 p$ v* r. h2 x. [- g0 F
  `( ^  G4 I9 K* ^: ]
  set-default-shape turtles "car"
# ~: `3 e7 f" X; I1 J+ J/ U9 ?7 t. u* M" C+ ~! Z
  if (num-cars > count roads)
" T) S: R8 j5 z  [$ T. z" B- W4 J, y4 C* I9 M8 Z% K
    user-message (word "There are too many cars for the amount of "
6 C* \2 O$ H  a% E! o+ P2 O# @                       "road.  Either increase the amount of roads "
* j" H! ~: ?: _, q3 Z7 F! [* e                       "by increasing the GRID-SIZE-X or "
+ Z9 c9 D5 J8 C- G, U& f                       "GRID-SIZE-Y sliders, or decrease the ", z2 x4 Q& W7 ^7 B8 z' j. q2 n( J" w+ a
                       "number of cars by lowering the NUMBER slider.\n"
3 r3 \% v, S& ]" f                       "The setup has stopped.")
' o5 c( X' }9 c% }" f    stop
, n7 {, u. R1 t  ]- \  j  U8 L8 u, z' d" q
3 V6 Y4 }& ~0 P3 T; \' h. N
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 X/ C% z2 J& C  i! Z( j+ F. o  crt num-cars6 ]  y/ b6 x1 l
  [
  b# f6 d& ^! ~* C3 L  o: t    setup-cars) H- m: d( C! c) u5 k7 k- O& a
    set-car-color
& |% _7 s4 j8 d4 M1 G    record-data$ j: D( c$ j) f; U
  ]: v. Z, u0 m. Y% J/ z) g7 F  E5 Y
8 [: {$ U, f$ H6 \& ]: B% z
  ;; give the turtles an initial speed* w0 d; {9 V* ~* S
  ask turtles [ set-car-speed ]
, `8 Q# u" o! C0 o1 I; k  l% a# b! X% B& w. ~6 t
  reset-ticks
' o2 W$ ^& F  M8 S5 @end5 o+ f0 z- W8 F6 T! L1 c/ p
$ p9 o8 @' z/ `! p* e
;; Initialize the global variables to appropriate values
: J$ E$ F9 L+ \3 O! r8 ]1 u6 oto setup-globals
4 X" a1 O( H/ z( m- D5 s  g  set current-light nobody ;; just for now, since there are no lights yet3 l7 m; @* @/ Z- O$ N( p1 S5 s
  set phase 0
6 Q6 L+ {2 h* b2 o" ^2 m7 X" |8 B  B  set num-cars-stopped 0
3 ~3 L3 G6 [+ Z- A  set grid-x-inc world-width / grid-size-x
9 V# I" N/ ?% Y9 O7 ~( J  set grid-y-inc world-height / grid-size-y
' v; h! J1 p: Y6 P9 n' p8 d) u. ?" X; U( Z9 h. V
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' ~4 y5 O2 \5 t  V5 K! \; O$ F
  set acceleration 0.0991 K' D' u# o  R# c0 d2 V) q
end; c& G& |$ Y+ F6 r3 Y# F

9 x( d4 m; y4 h;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" Y8 {. _8 h/ O;; and initialize the traffic lights to one setting8 k$ T7 L6 c) S2 m5 {" x; B
to setup-patches; f& O  s( Z$ H2 D3 N% @
  ;; initialize the patch-owned variables and color the patches to a base-color
. A% ?& N" J9 |$ P9 o4 M* j0 k  ask patches
- K1 r% b% x4 M: V5 o( c0 `  [5 U" B, M. ~- E% H1 f
    set intersection? false
+ \6 @5 o( O, m+ {7 |/ z    set auto? false
1 x, y5 H$ I2 H0 }    set green-light-up? true6 F- V, }$ ~2 ]) F+ \$ C
    set my-row -1
1 m! k* G1 A8 ?( J' E    set my-column -17 y& [0 F2 Y6 N* f# |( i
    set my-phase -1
* S& Y6 g+ d* J) e  y    set pcolor brown + 3
6 c& @- S: M! |% C9 y$ X  ]
) t6 A0 P5 z( l  S& v
" |0 \1 @$ i/ k& Y/ F# h0 o- F$ e  ;; initialize the global variables that hold patch agentsets
! i' h* G- j/ \" l2 O" `, p% L  set roads patches with7 I) ]! @% U  {- c5 h8 e5 L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' h" U( X5 ~% Q% ^3 c1 U4 c
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ a/ J3 n- E" @4 n6 g5 S  set intersections roads with
% S2 F  T7 [5 {3 ~" J    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( \9 ^, C6 `2 ~( @0 [$ u. M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! n- i' o/ z2 z# e+ o
( W; F, R% q  i- f
  ask roads [ set pcolor white ]: ]# |1 u3 F  d
    setup-intersections
* y# A/ X0 f2 i* N8 Q0 Vend
, f# [/ @! w7 u, b  g& C: I8 k) Q其中定义道路的句子,如下所示,是什么意思啊?
$ k4 a0 P/ E9 e( j" c% ?8 | set roads patches with: D- |& }2 p2 _$ [2 {# L3 p+ e- D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% q, g3 A' @, Z# ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" Z: P8 X7 f' b( o# [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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