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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。
6 N5 z* l1 i" U/ F2 I; wnetlogo自带的social science--traffic grid这一例子当中,6 T$ d0 K6 }$ l8 Q. d
globals
" a* y3 D' u4 r% A4 y' _[
* O; G# J. I* i- E8 P% C  grid-x-inc               ;; the amount of patches in between two roads in the x direction5 ]1 Y; |& \6 }6 k& M4 ~
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 `2 L& w% K" M* k, B/ m1 P  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
- Z+ w2 M/ R4 f                           ;; it is to accelerate or decelerate0 ^: V1 F: N: ~
  phase                    ;; keeps track of the phase
9 a( o5 W4 H, K2 R  ^1 Z/ k  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
4 P/ M* k5 \- R# p4 g- O6 t  current-light            ;; the currently selected light5 M3 Y* w$ c2 w$ N
" d; X$ [1 j+ K5 i7 F6 M
  ;; patch agentsets
) j* y+ g: E  f/ g  intersections ;; agentset containing the patches that are intersections$ L2 y8 u4 H& W& [2 p
  roads         ;; agentset containing the patches that are roads
6 n& a; G( ~9 P) Z]
6 j% Y5 M; Q8 |9 C5 V
; `9 t/ C/ g3 R* C# ]4 P6 `, Kturtles-own9 s2 C7 i7 J0 o
[
! X$ N# ?2 a0 m5 S6 z# W5 L. h' {  speed     ;; the speed of the turtle% a4 X6 m& c0 k: X% A- z# g
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: e1 {0 I8 b! _$ Z; m+ i, U& d
  wait-time ;; the amount of time since the last time a turtle has moved" e$ K+ r8 E+ K3 E+ r
]" M; F3 G7 q/ `6 T0 q6 W5 w

" D+ {; o. V) w8 ^% k% xpatches-own
; E' ^/ f; S/ m- c2 k1 g, g$ x4 H) `[8 ]; B7 `( {0 |/ F' r3 {
  intersection?   ;; true if the patch is at the intersection of two roads
2 u, H+ W" c6 R3 R1 X% D0 `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ M" S+ q: N) h- I# x/ s% W                  ;; false for a non-intersection patches.
0 ]: |8 x" w3 H1 y6 e& B7 l  r, e  my-row          ;; the row of the intersection counting from the upper left corner of the" e( B3 g3 [$ S2 M$ z. H
                  ;; world.  -1 for non-intersection patches.
7 V5 f( D9 c* R) d- t/ E  my-column       ;; the column of the intersection counting from the upper left corner of the1 o. `! M6 x2 Z# M( l8 h
                  ;; world.  -1 for non-intersection patches.
( G, ]  l% R, V; ]2 z  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.1 |0 K; D4 s0 k; q) x
  auto?           ;; whether or not this intersection will switch automatically.
$ X$ L9 w3 Z( r  C, u: R3 p! z                  ;; false for non-intersection patches.
! A6 y, Q0 J6 I9 G+ R. ?. O8 ?]: B# x; B* G. O9 c5 @

6 |$ }  C+ c' N+ m8 c! C, F5 S3 D# s+ m' a: c% K
;;;;;;;;;;;;;;;;;;;;;;1 p  L8 B4 n3 D. y
;; Setup Procedures ;;% O  \7 X- R% I0 p
;;;;;;;;;;;;;;;;;;;;;;6 c- j# t, I  |2 ^9 p

: `9 V! U: m$ {1 S;; Initialize the display by giving the global and patch variables initial values.0 [  B! ]) D( i: ~/ j
;; Create num-cars of turtles if there are enough road patches for one turtle to2 _7 Q- S  `! Y1 [+ B; q& d
;; be created per road patch. Set up the plots.. R6 G0 S' k( C0 R5 v6 y5 F
to setup( F: w4 R5 v, d1 J
  ca& n: F7 p7 t+ Z  ~2 S9 `9 u
  setup-globals
& d- P+ @+ _* {6 c* y7 h
4 G: Y( x0 \6 |$ ~. r/ A& r, g  e  ;; First we ask the patches to draw themselves and set up a few variables
7 f8 `5 Y& z9 G  setup-patches3 i- N; j) U; F/ Z& R( y/ y
  make-current one-of intersections" Z$ X2 ?3 k2 B5 E- W! c/ f
  label-current
' }, g7 `/ I( m% t
9 S, W/ \! l  |; M0 K! [  set-default-shape turtles "car"/ d0 f! ?7 A: ^( m8 i4 b# F
9 H9 h( \* N' P' @
  if (num-cars > count roads)
8 ^  \, u0 f; f0 P4 T; o4 d& n$ W. r  [
, M; x8 Z$ l3 v4 u6 i# B    user-message (word "There are too many cars for the amount of "
8 K% U! h1 P8 z; P8 n$ {2 x1 r% R' t                       "road.  Either increase the amount of roads "& t0 b0 t% K/ v% x- {  k
                       "by increasing the GRID-SIZE-X or "& d, _% d0 H: m- g$ y4 H
                       "GRID-SIZE-Y sliders, or decrease the "
8 j+ a# c! y' e$ `                       "number of cars by lowering the NUMBER slider.\n"3 E6 D# Z% M' L6 ]' i
                       "The setup has stopped.")
1 \. ]5 p# Y/ x    stop$ `6 Q3 N& w& z) a: }  B( W6 [$ ~
  ]% {* M- ~) M2 Q7 H

# D" Y+ Y2 _' g  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 G& d+ u1 E, e( ^% \$ |9 r  crt num-cars
* P; C6 y. g9 @- S0 p  [
  |& L  m! K( ^4 A    setup-cars
8 `" w/ R4 d" P    set-car-color
$ d- A% H# d& o+ C8 `8 D/ }    record-data
, H: C, J/ l! |9 [/ u5 \) k  ]6 Y, }6 @6 W8 j5 j4 N3 p# ]) |8 X
6 I  x" j( g6 S- F, H' X0 p$ d
  ;; give the turtles an initial speed
0 a) v6 k5 I( ^- D$ G% G  ask turtles [ set-car-speed ]
# ?$ M; e" C% e  g4 B1 w$ S* c1 H  m1 P' d% y; H
  reset-ticks
4 ^" N3 W( U! ?/ rend
: Z! ~* E1 k- g: _/ w% s" R5 ~% O( K* d- W
;; Initialize the global variables to appropriate values
  Q( y7 }$ J: F: C, Pto setup-globals2 m# _0 I. z9 Y8 H1 N
  set current-light nobody ;; just for now, since there are no lights yet
( |+ S1 p# H; q. E, ^  set phase 0
0 M" o4 U! ~8 g8 l5 W  m  set num-cars-stopped 0
$ u  S% W" }+ Z% Y0 N  set grid-x-inc world-width / grid-size-x
5 G# X! ^/ V6 }* p; K+ d  set grid-y-inc world-height / grid-size-y+ u! P2 o8 }5 p: i% C: z$ n8 j

% a2 G) h0 L3 A, s% O  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( K# n, G, t* r  set acceleration 0.099; K5 [9 i1 k' v& [
end
$ I5 z& ]7 U5 o( P$ {  z- s2 ]) X8 N0 c& I' K
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) E7 z$ E7 s7 T9 w( ^;; and initialize the traffic lights to one setting
6 Z( {; |/ A; ]9 [; hto setup-patches1 j" k7 F: Y0 o6 @8 c# a
  ;; initialize the patch-owned variables and color the patches to a base-color* d, ?, N, F% G3 T) m5 `0 N
  ask patches
  h8 g/ E% v5 }) Q  [
; W, S' \9 [* {: H" Q# D5 Y    set intersection? false
! Q+ V1 q, v8 o" d; E6 |    set auto? false
/ `* E' v% Y$ V1 P- c3 a& O( b# b5 \/ e    set green-light-up? true! x7 s8 Q( g- Z7 P! ?* x" p- }, ^
    set my-row -1
+ j, _. f& W9 b8 k, N# b: \    set my-column -1
! Q* Y: K: e- n    set my-phase -1& S2 o2 K& r- E2 \
    set pcolor brown + 3: y0 B% r4 Q/ r3 j2 V# G$ L. @
  ]
! Q1 v) F; i2 D
, p$ j+ N# x* Y" T  ;; initialize the global variables that hold patch agentsets
3 M, g# b/ Y/ m% v  set roads patches with/ S7 ^6 w0 U1 \& o+ }
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! c9 f# e8 K, j# {% P& Z/ s  P* V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 W1 G7 e9 H4 M  set intersections roads with
; `2 b" L  J- R' O9 `( J3 M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ f; |  u$ H$ B/ t) B2 a* D9 m    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 P% e9 {. i7 x: `3 e
) Y8 O, n- h" K# a  u, B  ask roads [ set pcolor white ]( R1 h6 O# x7 \$ }
    setup-intersections
7 ?4 A6 R  I+ f) [5 v  M- rend/ i: ]9 ~8 \( M6 J. V4 V
其中定义道路的句子,如下所示,是什么意思啊?7 \1 O$ g" P1 y5 m; l% F
set roads patches with
7 T2 j+ P! G3 d4 ?9 S: F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 Q5 p( g& k) f; w
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' O5 }+ D9 b) F  a. q; g: 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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