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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。
/ E6 M2 f) I9 @; Z5 l. anetlogo自带的social science--traffic grid这一例子当中,4 C- o  _  r% g/ e4 O3 S
globals
( ?- B7 t4 X, o( ~8 H. j2 `6 {[' e3 f: W. e( I" w& b5 X
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 P2 h2 s9 C5 {  grid-y-inc               ;; the amount of patches in between two roads in the y direction
/ `3 U) X- `2 V$ c: T5 n  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
# r6 J" {  Y3 V* Q& k                           ;; it is to accelerate or decelerate
  \( Y2 \9 E) @! X0 ^# Y  phase                    ;; keeps track of the phase
! L% b7 |* L+ ]) h; N9 `5 o7 g( v  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
. r, \/ ]; C0 v2 t7 B5 e: {  current-light            ;; the currently selected light& e5 R* p  k/ P4 N  L" K7 `3 n

6 v$ t% r, Z/ V* U; ^! u0 t0 t" ~+ R  ;; patch agentsets
" t9 W& [& {" C& U! c5 D* z  intersections ;; agentset containing the patches that are intersections* ]9 r% K5 }3 ]4 U% {
  roads         ;; agentset containing the patches that are roads" {: W5 P8 S$ D6 d% ~
], S, C' p6 I: @: }! H& P7 {
7 B& R0 ]- V( T8 t- r) |
turtles-own
! }. T# k  e6 O( B9 M[+ Y* B$ b% s2 N
  speed     ;; the speed of the turtle) W- e4 V- N- O, T- e7 z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
/ y3 c. {. U# v  wait-time ;; the amount of time since the last time a turtle has moved
7 |1 c" x( g$ C0 @) j! ]]% e: X" g  D$ C% {2 C- q" E

; N( c% L/ x+ n! ^patches-own
; l' K& D8 q" j+ h, J[
/ V8 f$ _- T$ [7 Z3 B! G4 _  intersection?   ;; true if the patch is at the intersection of two roads3 \% k' f% e0 ?2 H/ q. T
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
" t+ D6 X8 ^! n- ]                  ;; false for a non-intersection patches.
, }+ q' a' d8 N- [+ Q+ X+ @. _  my-row          ;; the row of the intersection counting from the upper left corner of the
' d4 B" F. J# q* w5 X$ F+ ]2 t9 n                  ;; world.  -1 for non-intersection patches.9 b! A" J+ K7 f- V- d
  my-column       ;; the column of the intersection counting from the upper left corner of the
# W: h- O% B4 x2 R& J! c                  ;; world.  -1 for non-intersection patches.# S+ Y' l  @3 |, K0 m# Z: U
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. q1 L. _/ H* z; ^$ U* O9 ~' u1 H  auto?           ;; whether or not this intersection will switch automatically.
% x9 p( @: ?( t) C# o7 _1 ~+ k                  ;; false for non-intersection patches.
6 M" Z# w5 V! B6 R: f) g]) W: {4 N! B: _6 {' r5 s
- M6 ?4 Y+ R. ]2 Q" ?
4 w% y1 }$ `" U
;;;;;;;;;;;;;;;;;;;;;;
( L% K( D: ]% m; E, p;; Setup Procedures ;;* f- n$ `6 `* C/ I, n; W
;;;;;;;;;;;;;;;;;;;;;;
/ J3 @" p& |; @" a* f
) v( l. H: O" h. _* k% C;; Initialize the display by giving the global and patch variables initial values.6 M8 C, X+ N7 `$ L8 w7 J
;; Create num-cars of turtles if there are enough road patches for one turtle to
* t4 w* ]0 }5 k; x+ \;; be created per road patch. Set up the plots.
0 X% y9 J2 f8 `3 _! wto setup! y9 Q& p, O# q9 L, [4 ^
  ca0 ]% z" R  F3 \  z8 o1 ~: H
  setup-globals
) q) [9 L, ?3 N/ d
1 W; K2 v! x* o1 `4 @9 v  ;; First we ask the patches to draw themselves and set up a few variables
) [5 D8 }$ d+ d, }+ B  U6 N  setup-patches4 v: l+ G8 ]2 K4 R+ M, A3 y
  make-current one-of intersections, N7 K! Q, c, w0 ]. p6 @) q+ [
  label-current2 x8 }  D6 e* T6 ^9 s
2 y  ~' l1 K& I) o
  set-default-shape turtles "car"7 N% t2 t! q8 e
6 y; D2 @/ H$ t
  if (num-cars > count roads)
9 S( H# ~/ S: `( i  [# x) A6 C3 H/ X
    user-message (word "There are too many cars for the amount of "
4 U7 I0 N7 ~5 k7 x! K                       "road.  Either increase the amount of roads "
0 J( a8 g' r" E6 s6 `# ]% x) b+ h: o8 k                       "by increasing the GRID-SIZE-X or "
/ a3 K- D& K9 ?% o% w( C6 Q                       "GRID-SIZE-Y sliders, or decrease the "1 S) s0 D/ e) S. x' z5 z
                       "number of cars by lowering the NUMBER slider.\n"! E  A! _. e. T! R0 S) n
                       "The setup has stopped.")* M7 ~1 ?' i( u
    stop3 g0 M' x( ]  s; P- d
  ]1 ]- B5 w3 L5 H) z% E

2 z+ S' u/ j! M7 J& ]: ?( x  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 M% A/ h! @- R; `) x3 |5 p  crt num-cars
7 ]9 p0 H2 E1 C5 A& T% y  [
8 l3 U6 M0 x2 U9 L8 r    setup-cars
$ f/ U, b% h8 @% b! f7 N, @2 O    set-car-color5 L+ p5 L  r1 Y0 U
    record-data
: K& y8 I% d+ }% A& o- L* n  ]
% e; b; e- w0 F2 M2 |+ k+ q. u$ ?, v3 L& ]* L" Q4 ^( p$ X9 x7 w
  ;; give the turtles an initial speed
& d6 c: _( m- \5 x  \# @% e  ask turtles [ set-car-speed ]
, S% _8 z+ F2 Q: \6 E: X9 h/ Q  P% ?. `6 u  m4 \
  reset-ticks; W6 _0 k6 a1 @7 q
end, _/ J0 B( Z; q3 b
3 z, t% M7 f1 ^  Y4 t' f
;; Initialize the global variables to appropriate values
2 L8 _, H: x& c) u* l5 F. sto setup-globals+ ~/ m$ g2 b) x: X5 C1 A3 s  h
  set current-light nobody ;; just for now, since there are no lights yet
4 Q! M/ O  t3 ?  set phase 0
1 m/ b+ w# K6 E  h, |! ]  set num-cars-stopped 0# y4 u" q6 V; w+ G4 m
  set grid-x-inc world-width / grid-size-x
# d, A2 C6 a. p  set grid-y-inc world-height / grid-size-y" o/ K3 @4 c* \, g& ~1 G9 A# d0 M
, W8 K, u! X  F7 S
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' w; G2 n- `7 m4 j% Z, _
  set acceleration 0.099
: y& H! f; t  d9 A# x) }end
' i7 i/ E2 z! s% r, C2 L/ l
; X& S+ {2 B0 Q9 q# y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,  \& E" A" P% B% R
;; and initialize the traffic lights to one setting2 N; p. d! E( n
to setup-patches; ]! Z* Y* H( h( S
  ;; initialize the patch-owned variables and color the patches to a base-color
- x5 [5 |- @* \3 x; A) j  ask patches7 G( t* F5 E( ~* K! W  ^
  [
, l# j) |9 Y) O" ~6 E# i5 F    set intersection? false) \6 ^( t) |. o7 x4 c$ `  l
    set auto? false# v, N$ [! p1 @+ N2 D# u
    set green-light-up? true2 D# p  j9 k3 x# C' v' N2 D6 M/ E* O
    set my-row -1% O4 t( {  l$ m7 o
    set my-column -1
- O* A2 C8 V5 v2 k( A# R    set my-phase -1
3 _5 x: A7 M& B- V& j8 ^6 H5 v    set pcolor brown + 3
$ Q9 a. \; a! b. |  ]( E3 `, ]7 f; W
% W- `, x! W- P' Q* c5 o" P; b
  ;; initialize the global variables that hold patch agentsets$ Y1 T& W7 F8 _4 B
  set roads patches with
' S; u5 H3 Q8 ^" a" m0 ~    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; {3 J' ], ~" b+ f5 ]* A& q6 @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ o  p+ N) o. U
  set intersections roads with" ]' D: [" [' Q. u. q$ C% l4 _/ R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 V( E) w" j" K' t2 n
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 z) i- o/ s+ Q4 U8 @( x$ _
: ~; K' o4 U  N( a+ l, V/ X  ask roads [ set pcolor white ]9 ]; x" }1 u8 y$ T9 _2 N( }
    setup-intersections
) K6 R" i+ b+ \6 O+ ?end
8 o9 ^, p& h0 r1 i6 e  z+ U其中定义道路的句子,如下所示,是什么意思啊?
' B$ u) j/ E: R$ f set roads patches with" t6 D% Q' V- g) ?  @  `
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 C, C  q1 c& D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 @8 U; U, g. ~* M4 H
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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