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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。
  `. t3 k- Z( k" Cnetlogo自带的social science--traffic grid这一例子当中,/ S4 D. G) Z9 c9 s' x5 a
globals
# @: R& E9 c7 R- o( r( j; ~5 p[: M% {3 n& Z6 l! O4 G; S2 K- ~
  grid-x-inc               ;; the amount of patches in between two roads in the x direction) y2 W: u3 K+ w
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 N6 z# M/ J  K( B8 p! Y  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, ~/ O( X, g& Q9 X& O% H
                           ;; it is to accelerate or decelerate
( D5 d+ Z% ]: X5 e5 g& _  phase                    ;; keeps track of the phase
% F2 I. J, |) O. x0 h  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 S( D" E( t% d) x  current-light            ;; the currently selected light
5 m" S9 T2 c1 j: W2 j, [; {; V" V. ^7 O& I* Y
  ;; patch agentsets
3 o; H3 k# B/ n! q& \$ r, n" M  intersections ;; agentset containing the patches that are intersections/ b! j0 x5 H* [1 y) u
  roads         ;; agentset containing the patches that are roads
7 m; `/ ^0 {" C/ h* W2 ~]5 q6 s3 y0 {: e2 f
# a( K3 i: `" t; S) q
turtles-own
3 n) q4 q  ?7 U( H& P+ ?[3 W/ T5 A& K, H# a6 S, G. z
  speed     ;; the speed of the turtle
1 u( P, y+ O3 s  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- B0 h$ j# _& ?' |! K  wait-time ;; the amount of time since the last time a turtle has moved
3 u1 U* l9 m# p4 B" w7 X# B]+ t- }7 w0 ]% I) X9 t7 v1 o

+ E0 c6 Y9 Q9 k7 Bpatches-own
3 d5 W" Q3 g7 x/ P% F[
; q* d# h% c' U! `) E' u- o  intersection?   ;; true if the patch is at the intersection of two roads3 ]- h- }1 \! W; i) R+ N
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.+ h# [" Y( E+ P, u: k/ ^
                  ;; false for a non-intersection patches.( p0 I4 n& U* W1 X  ^
  my-row          ;; the row of the intersection counting from the upper left corner of the3 h- S. L& Z- v- B' @
                  ;; world.  -1 for non-intersection patches.
' ^6 ~; O. V, c  my-column       ;; the column of the intersection counting from the upper left corner of the
4 `1 _; _! V1 f1 b8 }' g( y0 b                  ;; world.  -1 for non-intersection patches.
* B+ E& T7 k( L1 L  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* A* A" M2 u9 ?0 u8 f$ i# j$ e
  auto?           ;; whether or not this intersection will switch automatically.
+ C: n1 h/ b' u9 K3 R                  ;; false for non-intersection patches.+ l& O  J$ x0 x7 @" S
]
( p* X3 y6 a4 Z, u. S! y6 s: U; B% t4 F; z
1 x+ C& [8 e( @: {; b6 T) M
;;;;;;;;;;;;;;;;;;;;;;
( r/ y/ _/ g: H( @;; Setup Procedures ;;
, ~9 n0 Z$ \$ N$ k3 k. f. F;;;;;;;;;;;;;;;;;;;;;;9 ?. w5 f9 t# O) S; a. W
% d" y2 {! ?. m! P0 g! f
;; Initialize the display by giving the global and patch variables initial values.
" |9 f+ E" [! I* z, ?" H;; Create num-cars of turtles if there are enough road patches for one turtle to
# x. c( ]: e2 J3 @2 r3 K" y;; be created per road patch. Set up the plots." Z. b- v, X/ f* ~0 x+ b& g
to setup  h/ y9 C: Q+ g  e
  ca
! ]  e. J+ N: Y1 v7 ?! \2 B  setup-globals8 P* h8 s" ^4 P

/ `* p4 t# t" B, Q# d  ;; First we ask the patches to draw themselves and set up a few variables
# F5 [4 L. I7 R- }  setup-patches# g: Q4 u/ ~% h" V( r, e
  make-current one-of intersections
% i7 s' e) Y# ]  label-current
- A7 b- Y8 ~+ J7 }# I
% L  r. b/ N8 U1 I  F  set-default-shape turtles "car"
+ `( l# K2 p' s4 Y# _- Z6 ?) o1 Z. M
% J# D- [9 g1 k) ^+ V! L8 r8 n  if (num-cars > count roads)# l* ?- |# C3 o# i
  [
; R9 A4 g" o0 m3 h+ |1 u# t& M    user-message (word "There are too many cars for the amount of "
6 Z3 b- p2 D0 l# n7 f4 f8 [6 O+ u. U                       "road.  Either increase the amount of roads "
- k6 v( e, ^- v                       "by increasing the GRID-SIZE-X or "  V5 c' m+ j1 [5 [
                       "GRID-SIZE-Y sliders, or decrease the "
/ @: U* w1 c% Q8 ^6 w2 q                       "number of cars by lowering the NUMBER slider.\n"( h1 C2 ^2 h$ w: l+ Z
                       "The setup has stopped.")
1 e' y0 y7 b" T7 r; R    stop- a- U8 ^& i) G! \- X2 d
  ]' ~* K# k* f. n
4 `( B9 C1 m( n) G- @
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ g! X9 L5 B! Z. E- c# _% q
  crt num-cars5 L' g% E! ?: \: v$ k; C
  [
* j, N2 q# f' W, O7 @  @+ ^    setup-cars* j) ~$ @* M4 w& }  }# h
    set-car-color
& R- i" k, V) n& u) D8 a3 g    record-data2 H& H# X1 G; G% c) j
  ]4 P/ C' Z2 V9 k0 j, Z; S! D

3 k1 h2 g0 H% _. }  ;; give the turtles an initial speed0 U+ ^- a; i% u, J' d2 _
  ask turtles [ set-car-speed ]
; H" e' s0 Y3 ^- K$ l4 u7 B( m; Z) I1 S
  reset-ticks4 p& w+ S1 C& }3 b
end
! c' S' ^1 h% `3 G$ O5 C/ ^$ {" a' ?% k/ z* x. ]1 b  Y
;; Initialize the global variables to appropriate values# \  D+ n. z, \- y1 o
to setup-globals
9 f8 v; y7 J6 o1 L6 h  set current-light nobody ;; just for now, since there are no lights yet1 K( j% m5 w  j; W
  set phase 07 T& T9 I* z; W! p9 [* E5 P1 U
  set num-cars-stopped 0
1 a5 c7 t0 A9 }8 Z  set grid-x-inc world-width / grid-size-x
0 g, p% ^$ ~9 F* r8 Q6 D* @' l2 @. H( M3 O  set grid-y-inc world-height / grid-size-y
" z7 l/ }& b: o. }" R2 @
) l& h/ w! M% p& h  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 h' W2 z0 K, i3 Y6 j  set acceleration 0.099- P. l$ q$ K/ W* {4 D
end
* |4 z4 E  g/ ^2 z- @8 K# v. N* a2 O$ O8 b
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 D1 A5 ]2 s+ J" o) w;; and initialize the traffic lights to one setting
% }) f5 y5 l& K. L) E5 ~  Pto setup-patches% u6 x# d  }5 T( V2 N/ m3 c
  ;; initialize the patch-owned variables and color the patches to a base-color
' z) |# r% ]* p' K  ask patches7 K# E6 C5 n( }! p7 D! \, A0 R
  [
0 C" ?1 J. C3 m  Y3 Q    set intersection? false
& v  y% U& ~  J* T7 ^; p' E    set auto? false9 H6 q, V& a+ L" G' ^
    set green-light-up? true. `& A9 b( F. B, l! V* K" U
    set my-row -1
2 E9 l4 {) U! b$ ~& T) n    set my-column -15 \; i/ S( |; @. Y
    set my-phase -1
: D; F4 A  {& z7 \% \    set pcolor brown + 3
. E* J5 v8 c1 W3 R1 b  ]
$ u% ]9 {* V; q
$ U9 `* k6 n% B- D+ n6 k  ;; initialize the global variables that hold patch agentsets
* f9 I& T% w1 B0 ?, z* g* J5 H- X  set roads patches with
: f! D2 O/ v0 K% d% h8 R5 E5 T) y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: S+ n0 X) c3 Q/ W3 x    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: F% S: o' p7 t9 x0 [( h) R  set intersections roads with5 w  o% K5 m5 |1 Y& O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! w6 R1 h0 {! v9 ]" v$ O$ O! |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; Z' v: X9 P. `( @$ `" [: K0 ?5 S0 c4 ~7 r( q
  ask roads [ set pcolor white ]; w$ O( W8 o7 B" @, k
    setup-intersections0 \6 ]  }  y; ^0 w
end
* F1 W" y" _* {7 d6 E$ V1 p4 ~0 h其中定义道路的句子,如下所示,是什么意思啊?
) _# B9 E6 ^8 G! y: x set roads patches with
* t' L/ Q0 l8 p& i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& s6 a+ N" s  E3 k" a, k6 C
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 g: z7 L: m3 U5 Q) N3 p. t
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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