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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。
3 q; H& W% G* ?" bnetlogo自带的social science--traffic grid这一例子当中,7 x6 H* x  Y/ z, `
globals( S# {  l, c# \( t# @* r
[
5 k, V' [* w3 x  grid-x-inc               ;; the amount of patches in between two roads in the x direction
0 o8 |7 b! b8 b& J  grid-y-inc               ;; the amount of patches in between two roads in the y direction
- l" b0 S& [/ O3 d7 U" ?  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 G; M% ]9 o% ~2 h, U2 ?                           ;; it is to accelerate or decelerate8 L) g# g! s$ A
  phase                    ;; keeps track of the phase
+ I) d) U- ~$ J' I  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ |# ?5 E- S  M& g4 a
  current-light            ;; the currently selected light
2 ^6 n$ X0 i- o2 q6 o! y2 j
- P* S3 ]2 Y& s! c0 h8 A  ;; patch agentsets8 N9 A: Y& I5 u3 h
  intersections ;; agentset containing the patches that are intersections
0 V/ j" v; }& p! E  roads         ;; agentset containing the patches that are roads5 g5 X. U: D- E4 \& \: D* O) |
]
+ ~! L/ ]( @5 H, [( j
, r* C; l7 t" [% k; M9 X. sturtles-own$ v( M' t# ?8 P7 v. {7 i; l
[
; h+ q4 w* M& l) ^9 d$ J  speed     ;; the speed of the turtle7 Y5 K0 `! ?0 _; h, z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
, D5 i1 l' W8 r6 k  wait-time ;; the amount of time since the last time a turtle has moved
5 M' H, t6 ^! E  M, ]]6 k. v( _$ ]7 a7 ]7 k
: S5 ?' v7 z; F( W7 i3 ?- ]7 Q( o
patches-own
7 E) y6 U& u9 ?9 t+ [( f5 j; Z5 L& O# K[, P" K0 X: D1 m5 H+ G% z
  intersection?   ;; true if the patch is at the intersection of two roads
6 C  s7 ]& I# H5 `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! s5 V( T6 s0 y5 `$ c4 [                  ;; false for a non-intersection patches.0 [5 X' ]! I& y2 d5 e! M
  my-row          ;; the row of the intersection counting from the upper left corner of the
  O, M! [7 C  r+ Z4 L                  ;; world.  -1 for non-intersection patches.
0 j- e1 F1 f& S4 g  r) v  my-column       ;; the column of the intersection counting from the upper left corner of the$ f4 p! x0 v/ ?
                  ;; world.  -1 for non-intersection patches.  f" z( I5 Y( }" }- _
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.8 Q* ~4 f# `) I+ ~
  auto?           ;; whether or not this intersection will switch automatically.
2 Z. Z: Y" r/ }$ m" _+ O                  ;; false for non-intersection patches.
% i! U9 A" i& B$ O]0 g' G4 _) U$ Z
3 o, d' j6 r1 ^0 x4 H3 z
! @- P1 G2 {. E4 ]; u5 _0 A+ C; d
;;;;;;;;;;;;;;;;;;;;;;
% v) n* H  m! M9 B" n- ~& F2 `;; Setup Procedures ;;
% w  y: b% N  h3 s% u, _;;;;;;;;;;;;;;;;;;;;;;+ w3 e$ g3 B, V( u- L) |# k! ]

  D' x- l& W* V& m8 Y0 Z2 i;; Initialize the display by giving the global and patch variables initial values.
+ s, X0 T! ~7 F+ o- C# k. x$ H" F% y;; Create num-cars of turtles if there are enough road patches for one turtle to
% h+ y; d& X7 X" k- P7 [;; be created per road patch. Set up the plots.
) o9 a( p( T* @% z& xto setup- L% N: `. I2 |. l
  ca% r% O8 s2 q( _$ J( g, u' w
  setup-globals
% V, C9 w# X+ m9 N8 E6 h- K8 r+ F* Y# m; e( M
  ;; First we ask the patches to draw themselves and set up a few variables7 v% @4 E# V; ~: |& g
  setup-patches% e: q: D* q' j; x" R8 e; F
  make-current one-of intersections
. j6 m/ `5 q! A6 F; F9 V- N" K  label-current
3 |3 R' Y+ L" ?# W: s/ h8 T9 ^1 B6 e2 M0 ]0 S: A& l- ?1 V
  set-default-shape turtles "car"$ V* b9 p1 n1 j. k1 ~
5 y2 u$ p9 F$ o, g0 F3 ^$ W- Z
  if (num-cars > count roads)- P# f6 X1 U% ?+ k  \# r+ ~' }
  [6 l1 \6 ~# |# w; D. U
    user-message (word "There are too many cars for the amount of "
2 i" V* K7 o' g) [# w                       "road.  Either increase the amount of roads "& X6 x  O1 ~+ T: o% B. P9 k) x
                       "by increasing the GRID-SIZE-X or "
. Z2 s; y% c) {( G! E                       "GRID-SIZE-Y sliders, or decrease the "0 f* B, |: c% a
                       "number of cars by lowering the NUMBER slider.\n"3 w2 n; f! @* ~2 D
                       "The setup has stopped.")
- A( c' d2 m; g3 K3 B    stop% A- I  D7 K; F4 ~- R7 w# r
  ]7 @+ q; H$ P: _
3 \4 ~: h5 D6 C
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 X; l0 a) t- P5 F  crt num-cars
( Z. z1 J% a6 y( S  z0 T4 B  [
; m3 g! V0 F* y( j' N+ V    setup-cars
2 k2 N4 R. f6 h% s    set-car-color5 {4 S, t  M% M' J9 j2 `
    record-data
1 @, K( N% J' M4 v  ], b4 U8 h4 p3 J+ ~6 w6 t) \( x

& o" s" [+ B" X, Q% F3 ?2 g2 g  ;; give the turtles an initial speed1 I6 W6 j+ e& P- D3 o
  ask turtles [ set-car-speed ]
8 Q6 x0 O3 F: k& p! r# o/ s& s( C4 d) ~) ~1 ]8 Y
  reset-ticks
( w; ~7 F) s& M/ i9 f' pend, ~+ L  a. G$ _0 k7 s
/ W6 Y3 {8 E# _* X7 b) `9 M% }( U
;; Initialize the global variables to appropriate values
% `5 i' }! v$ ]0 R7 g5 xto setup-globals/ n4 z$ _$ R5 ]$ B
  set current-light nobody ;; just for now, since there are no lights yet
' U1 I5 {" d  e/ h  set phase 0
5 O. b. P: P; o3 J/ I! A  set num-cars-stopped 0
3 w- f3 f" {* T2 n( B7 [3 N  set grid-x-inc world-width / grid-size-x! w/ a: C  Z8 g( y6 x' U7 `
  set grid-y-inc world-height / grid-size-y
6 S2 }. e8 b8 u# T/ u" T( ~3 v3 D4 N3 n( Q  p2 [
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ l- O) k. `% [6 L  set acceleration 0.099* p; k3 e" \, t: L: G0 m
end
; w6 n* O# X" p  N- M4 O7 d2 P. `# f) H) w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,  a  u" y) c/ A  O
;; and initialize the traffic lights to one setting
: }) w6 o& }% T! Y- \% y! e) rto setup-patches, h9 D! J. ]5 |) X+ H" n8 ^
  ;; initialize the patch-owned variables and color the patches to a base-color
4 J! _' R! o) X. U2 Y/ L7 u  ask patches
' j4 L- W0 `5 B  s4 M  [& m- `0 w3 K/ u7 d! B' i2 z
    set intersection? false# X4 }- `; x: L
    set auto? false/ Z& ^4 E+ \& }, l6 q
    set green-light-up? true
& n% N& H5 s* M# X# H0 s, [    set my-row -1
6 E4 s4 r" J! I( f& P3 e& {. j    set my-column -1
1 |( q6 }% X; M$ Q7 m# j    set my-phase -1+ j5 f  J# @9 `' e6 w+ u
    set pcolor brown + 3
/ t' ]& V# V( r1 d5 f  ]- l3 _6 T2 y  C: D$ V8 Y- F

. w; W; i6 B, o: Q7 E8 Y, z1 x* y+ U  ;; initialize the global variables that hold patch agentsets
4 P9 ^7 f5 W" `2 A* l" A3 y  set roads patches with" K. Q; }/ F/ Y/ C2 R- \% f
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ G6 y; F; N( h) M! z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], C" l4 q: ]' a: v1 x
  set intersections roads with
4 D; O  g" t) U2 @& q# U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 H2 t9 Z6 a: {5 r5 C% [( V9 ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ `5 y; k5 I. S, X: B2 D' c+ c0 t4 d1 U  b
  ask roads [ set pcolor white ]  P; T' ~* K. f
    setup-intersections& m. Y3 p! |- i) ~" `
end
8 P# i0 K2 v+ I" F/ F6 g1 F其中定义道路的句子,如下所示,是什么意思啊?
" b( W' o# H% c0 E# G set roads patches with
" r% ?2 s  N, `2 P, I5 k, [) O- C0 q5 C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, ~" m. N* |: q- {2 ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' d; Y2 \/ ^. Q1 v6 Z$ \& o4 }( ?4 c* 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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