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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 a# u& m  l) rnetlogo自带的social science--traffic grid这一例子当中,
) ?- b* x! v- ^( w4 d- @, x$ yglobals! k" ?- B1 Q% l/ o
[
" R; l  U2 w8 s, i  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 i* x; _4 ^5 ]! [( _  grid-y-inc               ;; the amount of patches in between two roads in the y direction
0 Z# v& e( Z( s  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
) {/ t, I& f. m1 @                           ;; it is to accelerate or decelerate
4 Y2 Z; s! V, \5 r  phase                    ;; keeps track of the phase) G" H- l$ s  y- S8 m1 f
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure3 x4 i1 |2 q2 p7 C
  current-light            ;; the currently selected light
' z1 H* N0 A4 j
' I! t, ?2 Z, p& p5 ^! B3 c6 y+ W  ;; patch agentsets- c0 l! E! `* e: w4 V0 Z) B1 I  v# R( o
  intersections ;; agentset containing the patches that are intersections
2 M8 V0 Q4 \) K) h) r! X8 j! ?  roads         ;; agentset containing the patches that are roads
+ r$ y- l, i. O8 c( ^& P]: ]5 S# k5 B% |: }& a: n: }) t
+ f  D- k1 \. k6 h
turtles-own$ E7 ~3 T" T- C, y
[2 A/ H  ?- r/ B  H5 O
  speed     ;; the speed of the turtle- s5 ~5 v+ f; C7 \' z8 |
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right! L' X, l: a0 x8 W
  wait-time ;; the amount of time since the last time a turtle has moved& b) S  [# l% x* E: F- ^6 j
]
$ v0 F# q2 a) X; C
6 C1 {3 i; `8 I$ @  F5 ^! tpatches-own
) ?5 x) t+ \) }6 q[  l& ?  J1 L9 F! t
  intersection?   ;; true if the patch is at the intersection of two roads9 [2 `0 z6 M% m( d! w2 z7 H% T% S
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  d2 N8 S$ F7 T! O3 o                  ;; false for a non-intersection patches.4 Q' |9 N; |3 E: y; H. i& s5 o
  my-row          ;; the row of the intersection counting from the upper left corner of the! ]& _, [! [. E5 s* u
                  ;; world.  -1 for non-intersection patches.
6 m% `  Y& Z9 ^) L3 ?% m: {+ x  my-column       ;; the column of the intersection counting from the upper left corner of the
4 W' ~% _( L1 G! K4 g* G& h                  ;; world.  -1 for non-intersection patches.
5 \! |$ K3 g; s& W! M  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; G4 C( [* g1 t% O  i
  auto?           ;; whether or not this intersection will switch automatically.. o( e* B- V) B: u& W8 r) i! r
                  ;; false for non-intersection patches.2 k, ?4 R" c: A
]9 v4 j. [- n, d7 @) K0 k- j, o7 P1 v. j

/ E# U& }, i, a! _$ R4 j7 g2 f5 o: R9 |3 o3 p$ L0 c# G8 n$ {
;;;;;;;;;;;;;;;;;;;;;;& e5 G8 B6 D6 h7 c, q$ y# t, k$ I
;; Setup Procedures ;;
1 K7 u$ C: O  E! v" [( t$ e;;;;;;;;;;;;;;;;;;;;;;: b( v. L: {5 R* n, R& q

# l1 @3 U+ h4 I# p+ @( K;; Initialize the display by giving the global and patch variables initial values.
/ \3 z) f  u, s( F6 Q! i# R;; Create num-cars of turtles if there are enough road patches for one turtle to
( n0 D' h  U/ R3 g! j;; be created per road patch. Set up the plots.4 l4 `, u9 V" ?$ B- G2 [8 t8 ]
to setup
" A) n8 S1 b% T1 l9 X  ca  t' M( ~: ]3 m. Q0 Y
  setup-globals
( {2 V' ?( H$ q, V/ R/ L3 S& T. Q2 ]* W  s( w6 |3 H: N* S! v: @" f
  ;; First we ask the patches to draw themselves and set up a few variables
- [$ z1 k% }3 J" t+ L1 U: S' l: U  setup-patches* A( S5 u) u% Q: h1 A7 P- N
  make-current one-of intersections
; S* r7 ^# P0 }3 r9 W4 q3 A* B  label-current
3 n. K, r. h3 T1 q8 @# u
. v6 g+ ]) {/ s/ M4 H# A  set-default-shape turtles "car"* {& h5 J1 j. e0 @
: x# o% C1 ^- A) v4 z2 @6 r
  if (num-cars > count roads)
; R" I+ R1 S" n  p; l7 L  [# L2 i3 T4 y* r! P+ ]+ j
    user-message (word "There are too many cars for the amount of "/ g: t0 e3 H) K  B
                       "road.  Either increase the amount of roads "* d; H5 \! ?6 S* u8 Z& \
                       "by increasing the GRID-SIZE-X or "0 f, u/ w1 ]2 @% ^" e# \  P( F; A* t$ X
                       "GRID-SIZE-Y sliders, or decrease the "
( D. K; G4 l& j  p/ `                       "number of cars by lowering the NUMBER slider.\n": ^) U) T' O$ y  ]7 v' s" z1 ~7 H
                       "The setup has stopped.")
% r- h& }5 Z$ _2 L1 h' H    stop) r: W% ]4 }+ L3 N1 p; }4 h6 d$ j5 `
  ]6 r: @3 n+ L  C- G" A
1 x- y7 V. M3 `7 j6 [
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ e" P  M5 U7 L3 D7 _: I
  crt num-cars# q# w+ n" l6 U* K5 z* F
  [9 I1 l" K( h7 `3 z. x9 Y
    setup-cars
/ Z, W3 j. I& k; h( S% J    set-car-color
/ M% j( _0 R/ Y: L. B% }0 J3 |' o    record-data+ G, g  G5 s4 i; _! d+ r1 l
  ]- K. S# y  g: m+ o

1 k5 y% |0 F  i/ [) L" H  ;; give the turtles an initial speed
+ z7 s( {3 b: M8 f5 |0 k/ g* j( a! |5 B& D  ask turtles [ set-car-speed ]7 {7 `2 o8 e/ w# J. F) z

! |& Y  c' Q. e, z6 g  reset-ticks; Q& h+ V1 s- i: P4 Y1 |
end& t9 W4 s0 p2 T# J) c
& n5 W2 Z) F# U- g# W$ G
;; Initialize the global variables to appropriate values
& n+ d- v9 J9 A1 L+ Uto setup-globals! X% c! ?  k" [4 k, J
  set current-light nobody ;; just for now, since there are no lights yet- _! z1 J7 G( N* I+ `7 Z
  set phase 0$ v6 i9 w/ @0 h. y! [1 L6 ]
  set num-cars-stopped 0' H9 }; T$ j6 m" p1 L
  set grid-x-inc world-width / grid-size-x
) t+ u( M0 B% N+ l( D" w  set grid-y-inc world-height / grid-size-y  k2 i; A$ v) U; X

9 D; W/ v) b6 G1 X  r1 \6 ^  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
* e0 P' n. S6 _2 W+ [  set acceleration 0.0998 K$ Z# G7 o- G; q1 c2 ]
end* g9 K. e3 K/ ^+ J

" m6 E' q" l. [  j; l7 e3 }4 K( Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' D! n  @2 O% S* m
;; and initialize the traffic lights to one setting- c3 S% z( n' X6 e3 n% U
to setup-patches5 H: C0 a5 n8 X! R- ~" U
  ;; initialize the patch-owned variables and color the patches to a base-color
* S* m- k' ?4 I0 z  ask patches& l7 P, |! a# [+ d4 c6 O% X
  [! U) ?( c5 j" A. A7 h- m1 b
    set intersection? false$ \8 U0 j! {: X+ C+ [0 Z$ j
    set auto? false. C& z9 Y2 R, `1 X4 `  B2 w+ s
    set green-light-up? true
* f0 U* j# d. }; v! W* S    set my-row -1' h- h# k7 N' }) ?% u
    set my-column -1* t3 K. [" F3 a, E9 g, Y" |! b. k
    set my-phase -14 s: B" j2 p3 \2 H
    set pcolor brown + 3, ?6 S2 y) _8 e, q2 M3 L1 y' l- M
  ]0 l1 z9 A- T% R& \3 Q+ @! t' A

, k' i" t( t+ J3 K0 ^  ;; initialize the global variables that hold patch agentsets
- P5 Q! D! S' I" I# N" j* f; C  set roads patches with
, Q+ I& C/ A' H. t# g) o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  `6 [3 h3 l2 @# Z7 j; @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) v" l" {. Q, ?  set intersections roads with6 M! y% p! K; }& L1 R  \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 S. a# _& ?9 J, \    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! H) g' D) u; P6 h2 g% u* k8 X
9 ]* g3 g* @# t
  ask roads [ set pcolor white ]
  r+ }3 `! \8 ^% o; G  H2 i    setup-intersections
; z0 T- b4 u3 e3 @* aend" L* y, K6 G5 \1 G0 g+ J6 `
其中定义道路的句子,如下所示,是什么意思啊?" |6 c4 K3 v9 _" s& I1 Y# [
set roads patches with$ K- C/ U1 O3 `9 ]; a$ c8 }3 }3 t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- }9 D2 b( S3 A( s. q- n3 R' i" I, f    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 R. l& e0 D, b2 ~' g" D; s
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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