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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。
% M: }7 o7 o" ^" nnetlogo自带的social science--traffic grid这一例子当中,
; n8 y; D9 z& [& b! r# eglobals, i- `& {; a2 Z5 R. Y* W  ]
[
/ ^' l# H2 D0 {  grid-x-inc               ;; the amount of patches in between two roads in the x direction; q+ }7 `+ ?: x, b* p
  grid-y-inc               ;; the amount of patches in between two roads in the y direction# c! ^1 f4 I6 N3 I
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 u' p+ {, j/ h: H3 C$ F, p! u
                           ;; it is to accelerate or decelerate
  [4 v; F/ W% t, ^/ d  phase                    ;; keeps track of the phase
  o9 ]6 `- t/ _# J9 Q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
8 C' Z- d! X3 A! ?  current-light            ;; the currently selected light
6 J2 K! J. W( Z; C
- s0 t9 R, p% k. f7 Z  Z1 Y  ;; patch agentsets
5 L4 q# ~4 Q$ o( ?8 Y+ |7 u* X  intersections ;; agentset containing the patches that are intersections
* R; i" p! w6 m* X  roads         ;; agentset containing the patches that are roads
# D" V* z7 Q1 i$ L& J# Y3 M& O]" e2 u2 B7 A% N1 a( y5 u# P

) z' ?7 A9 e1 g/ tturtles-own" ^* k9 w$ s  e
[: |$ _, ]+ }) h2 U- j1 g+ ~
  speed     ;; the speed of the turtle
# s& Y9 L3 ~1 y7 W0 C; {& \3 ^+ a  up-car?   ;; true if the turtle moves downwards and false if it moves to the right0 M1 f/ X3 Q( D" Y6 ]! N
  wait-time ;; the amount of time since the last time a turtle has moved0 \3 ^% s0 j+ ]1 p3 ]4 y7 N
]
# [2 A' }/ i: }( C0 ^6 Q  C. `6 G8 d: S
patches-own
/ F; Y4 b# V# ^7 q9 P/ C[
* M$ G! V$ v7 b' z; Y  intersection?   ;; true if the patch is at the intersection of two roads
: h, l5 v# K) q( J+ K4 w: n  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 f4 V3 D! M6 W. x                  ;; false for a non-intersection patches.
9 h: Z8 O1 V2 s* Y% v  my-row          ;; the row of the intersection counting from the upper left corner of the
+ f2 r5 f/ o, g. h# G; A4 ^+ C                  ;; world.  -1 for non-intersection patches., }, w$ D- r7 l4 V# @8 b
  my-column       ;; the column of the intersection counting from the upper left corner of the
: \% U9 K1 f3 K                  ;; world.  -1 for non-intersection patches.
- W. C0 z3 t$ L2 ~* \# z  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.& ]9 L+ k& @0 r% C
  auto?           ;; whether or not this intersection will switch automatically.4 @: @; m# q& Z
                  ;; false for non-intersection patches.
* k# M; ^. {& X9 |' {) b4 N6 m2 M]
1 s, Q# Y: ~  A( M2 S8 t4 Y
% Z7 x7 l& T0 W- |0 c  t% h* i2 H6 {* Z! y
;;;;;;;;;;;;;;;;;;;;;;
; Y5 R: A. X) M( W) o;; Setup Procedures ;;' W$ b. Y" [, |* r3 g
;;;;;;;;;;;;;;;;;;;;;;
% e4 i% V9 |" E8 Q% ?6 ?" k% }' }1 z' Y9 F
;; Initialize the display by giving the global and patch variables initial values.8 \9 [8 o) F+ f, E5 R
;; Create num-cars of turtles if there are enough road patches for one turtle to
% J) v* ]7 f: ~( O' D( i6 Z3 @* X8 F;; be created per road patch. Set up the plots.
% u6 i" i6 [- ]0 n5 z, ato setup
4 s8 u' C8 t+ t8 {+ P  ca3 d  e( J4 Y0 t2 Q9 v' @/ Q  m
  setup-globals9 x& b5 k; I. c' l+ Q; e4 d; T

! Z. b' T( Y4 J1 ^9 v9 K( S  ;; First we ask the patches to draw themselves and set up a few variables1 d9 t  B9 H) a1 v
  setup-patches! \6 E3 v: o6 m6 T% P
  make-current one-of intersections( f* C5 Y6 D6 O" d5 I5 _# J+ z$ q
  label-current
! P  q2 v1 @" A( [% |6 Y) u% B. _/ F2 V: e
  set-default-shape turtles "car"
, u0 ?+ g" Q7 T6 J, `* l
6 f5 R! v- s+ x6 @  if (num-cars > count roads)
8 M& |! j& p  d, n/ E  [9 Q" ?+ R9 z; a- X! p6 ]4 ]
    user-message (word "There are too many cars for the amount of ", j: |! u" M5 N/ k
                       "road.  Either increase the amount of roads "5 |) ~/ h* h1 R$ \8 L. ^& V
                       "by increasing the GRID-SIZE-X or "
# |5 {3 s; P7 R! J                       "GRID-SIZE-Y sliders, or decrease the ": @5 P; R6 n; s+ R
                       "number of cars by lowering the NUMBER slider.\n"
7 N8 @) m1 m% B; b( K  ]( G/ }                       "The setup has stopped.")5 H- K  a7 F6 I" s9 {: J
    stop
3 Z( ^9 ^2 ?: V  @& o" t# h! m9 D( J! q  ]3 V6 Y% k7 |9 h1 k% y  U

/ q! Q4 Y- I! f+ A  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: H" h/ t9 ?8 Z" ~  crt num-cars6 {8 C/ R1 h( D1 G+ z$ c: B
  [
3 v! x# `9 ?: Q$ p    setup-cars
8 v  s  U7 F: d  [2 J- \2 U% F    set-car-color
$ l6 ?; ~3 ~/ E$ m/ b9 ?5 g    record-data
% g3 z6 v# i) B2 A  ]
8 l" `$ }- M+ [$ V' W- g; D& c$ d( C1 a& c7 N8 ?+ y2 }! ^
  ;; give the turtles an initial speed$ H$ ~- A( t( H) s: ~4 o, J6 Y
  ask turtles [ set-car-speed ]
/ C1 s1 r% l2 F6 l. K% [9 i" E2 t9 k" S" J6 i: }4 T
  reset-ticks& F8 y4 i- F9 ]/ Q2 O! [" Y
end2 i4 a% n, K# y2 P* K
- O$ A7 Q7 X! H" a9 i8 F
;; Initialize the global variables to appropriate values
0 u. J. x+ W) N+ L2 K3 B  q9 sto setup-globals( G0 ?' h2 p2 s( D1 h
  set current-light nobody ;; just for now, since there are no lights yet. T" I$ M( n/ v
  set phase 08 [) J& I" E) X$ E' a) a! B8 _
  set num-cars-stopped 0
6 H0 u! z/ a" W% \+ P% m% Q" i: e  set grid-x-inc world-width / grid-size-x& o( A% {. r4 c  [' _
  set grid-y-inc world-height / grid-size-y* S6 n. T' Y  c3 V

4 Y6 Y" F# r* {* P0 ?  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary- J. l' o, R: V+ U# U6 Q& k
  set acceleration 0.0994 U4 q: y, C2 b; Q* L" u" S
end
" \$ s6 U% u3 H- v1 a# F4 j- _
8 V5 d" i& Q% q! y  k# J% c' Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) h% O# a* K: g. Z/ d
;; and initialize the traffic lights to one setting
2 j3 A- `. Y% R' f; n9 Zto setup-patches
# Z4 C: f' s6 ^6 y  ;; initialize the patch-owned variables and color the patches to a base-color
- p1 j' h6 j" }  ask patches: |+ U9 V4 X+ r) w
  [' ^: G1 n; ?7 O1 p' u  T
    set intersection? false
' G! f; C7 }/ N3 m    set auto? false
. ]4 q1 `- j6 h- ]7 t! V    set green-light-up? true
  v$ R4 D' y$ i( K    set my-row -1  y) B& ]) N3 W0 j1 X
    set my-column -1
  l3 p0 @7 ]2 Z4 i3 ^2 P: W    set my-phase -1
! P- G5 M  a( @    set pcolor brown + 3
$ b8 e+ r  h7 q3 ~  ]1 l1 P2 ]5 Z) G2 C

1 z2 Y& T0 p7 x' _  ;; initialize the global variables that hold patch agentsets" w( j. S& o$ ~; V& M; Y
  set roads patches with
% E0 [2 @  Y  b, T6 {    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 E0 o! U3 C8 Y" o0 d; c
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" l9 F) _' Q" N
  set intersections roads with
3 y7 m% ^; r( D! f! e0 n1 e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 ~0 f, y" ~2 G1 w
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- G8 S2 C) S8 d' i- B; Z, K# w$ H/ W2 y- X7 K( ?* Q( F
  ask roads [ set pcolor white ]6 C' s0 {. l) I* B) S
    setup-intersections
% r0 H) f! ~7 B0 ~% i5 n7 xend. @. @( C* _3 N3 u& ~
其中定义道路的句子,如下所示,是什么意思啊?
# e! c; ^" \( s8 f2 v set roads patches with
+ q. D2 m: m+ V8 C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ e: \! n- s' A$ ^: @3 ]. R5 u    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 i' s) g) X& G# Z9 M% q. v8 ~
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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