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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。
/ G6 k  s7 B0 q" |+ L; e; S% Rnetlogo自带的social science--traffic grid这一例子当中,
2 ?0 j$ b( `5 O' K& Y2 e) Eglobals
+ E! k5 L1 I& V& s. x! g+ C1 j[
! _' s; Z9 m  H4 m( c  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ F( J( ~- k0 }6 i; Z6 W
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
1 t8 A$ K( o% n; s  acceleration             ;; the constant that controls how much a car speeds up or slows down by if* V2 n8 t" R& P- B
                           ;; it is to accelerate or decelerate0 w. Z( E# N& N& J$ W( }: [
  phase                    ;; keeps track of the phase
6 I, U5 ]# [/ v  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
- F8 R; f4 W1 N/ r& r* U/ f  current-light            ;; the currently selected light* F% P: t- t/ \7 h0 o( G
1 P, u- F* c8 a- i- k$ C* T
  ;; patch agentsets
) Q% t7 c3 K  }" t5 T: a  intersections ;; agentset containing the patches that are intersections
; ?% ?! ?# Z* }6 @' x% I  roads         ;; agentset containing the patches that are roads
5 U# P* u4 E' `6 \3 p! j$ u- d6 [# Q]) V4 W' g: D1 g1 a9 C9 @
9 L0 K  ~; P. e, o7 P& w
turtles-own% S  i! a9 [% Z% s" w1 c9 b3 x
[0 T# }+ A7 N9 m' ~1 `
  speed     ;; the speed of the turtle& Z2 u& W: @4 O$ \5 y  z" h
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right% R! ~; S1 ?" y$ J5 d
  wait-time ;; the amount of time since the last time a turtle has moved$ Q% ~8 k' _( w1 k
]' e5 K' h9 y' G! u
1 r+ c: V' W& d9 I3 q, o
patches-own( K( g3 A- @  G8 l, d3 }
[
9 |  f& L* K. F- P- ~& H* ~  intersection?   ;; true if the patch is at the intersection of two roads
* v4 |; b; L0 \6 F  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  s6 U; I7 @+ f3 t( S: B
                  ;; false for a non-intersection patches.
' M6 `9 d$ H) C" C  my-row          ;; the row of the intersection counting from the upper left corner of the- n0 j2 N2 |5 D; r
                  ;; world.  -1 for non-intersection patches.
2 H- t6 \* f! ]5 w/ x2 E8 j  h# y  my-column       ;; the column of the intersection counting from the upper left corner of the
. n5 }9 |  i, D5 U- |. u1 W                  ;; world.  -1 for non-intersection patches.1 [# a% `2 }8 [" A& m2 m
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.: h3 l. Y# ?- E
  auto?           ;; whether or not this intersection will switch automatically.% A* @. C% e+ `' O; H+ P3 |
                  ;; false for non-intersection patches.) ~% m0 y/ G8 x" F/ i! [1 _
]
+ v3 D+ O' i8 D6 g8 d( b1 b' e2 z3 O2 K/ ^

* P& N0 t2 Y5 p7 ]& @- ];;;;;;;;;;;;;;;;;;;;;;
" ]! s# f* u$ |% P* D* M;; Setup Procedures ;;
9 l0 D& B2 F$ ~7 U& I4 H;;;;;;;;;;;;;;;;;;;;;;
  q# ~0 g$ F& `% I  r
1 K; m+ U% O, |& {. w5 G1 m;; Initialize the display by giving the global and patch variables initial values.
; y$ S* k5 g, l0 K* h3 S2 k;; Create num-cars of turtles if there are enough road patches for one turtle to( D2 H# W0 [- ~) u2 D# I( F
;; be created per road patch. Set up the plots.
9 b% g$ C6 |5 f! u' _to setup
4 R6 B. R8 r: d8 X# Y; c  ca
$ L+ v3 y& q+ [( W7 `  setup-globals9 |4 A2 Y$ P8 @* K$ p
7 U8 y6 N+ {0 D
  ;; First we ask the patches to draw themselves and set up a few variables- m. }" l( H  a) r, {. Z7 a
  setup-patches
* H& a/ k* O1 P, ^* u  make-current one-of intersections7 q; f0 b, F; i0 {# F
  label-current6 j" n, F% b9 D# r
! l: J' u7 }' j) J5 u, ^
  set-default-shape turtles "car"' \- E# O2 P" L) h
# N/ v1 L/ H6 K6 u( e: b+ V! Q
  if (num-cars > count roads)3 g$ B1 ~" B% D) F' i5 L
  [
+ ]0 X* H4 @- \+ J" w) z0 f4 a; F/ b    user-message (word "There are too many cars for the amount of "
% X. W- r/ u$ E  S6 j3 M                       "road.  Either increase the amount of roads ". J( c% _) U% J
                       "by increasing the GRID-SIZE-X or "' F5 M- x7 d! a- y5 O* R5 e. g7 s
                       "GRID-SIZE-Y sliders, or decrease the "
- l/ ?& E8 k1 ?4 ^9 k- T% m8 T& ]                       "number of cars by lowering the NUMBER slider.\n"
5 S9 p0 W. c% m" M; r                       "The setup has stopped.")5 S. S& S/ c* q* b* x$ o
    stop
/ o9 u, d: P% v! _4 ]  ]$ M9 f; z4 n' ?. a" n
3 ]/ l- M7 j$ H. Y
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 \1 h; i& X2 Q# \* n/ Q  @1 a  crt num-cars! i% O, s8 G) v8 c/ z
  [
: f; `, a/ f: h5 S- O* ~    setup-cars7 y* g! ?4 ]# U( n% N4 |
    set-car-color! d: t7 [2 Q+ P/ h
    record-data
$ c4 `; ^1 r+ j( i. [) J% o! L  ]& V6 }3 `' D. o' Q$ e2 n; u. z
* G" ?4 {& T7 R
  ;; give the turtles an initial speed
, G# b8 n( |3 |% v$ I  ask turtles [ set-car-speed ]: r' _4 h. j1 r* |# B2 A5 \
4 X) n9 R+ N# l3 u
  reset-ticks3 q$ B4 Z( ~2 K1 Q
end
4 Q7 A5 y2 E6 v: i; `# a0 a3 I; i7 Z# ~: i+ |
;; Initialize the global variables to appropriate values
8 `5 e& o& p4 Y4 U8 q# Vto setup-globals: e9 }" r# @9 T4 i1 @6 l: x
  set current-light nobody ;; just for now, since there are no lights yet4 [0 O5 J7 o  ]. h
  set phase 0
2 D- y, j* m) b; x  set num-cars-stopped 0) O& P, c( M5 j
  set grid-x-inc world-width / grid-size-x6 q! D$ F+ W) \: p, s
  set grid-y-inc world-height / grid-size-y" J! g" J, N, S

. H" z+ k4 i* d+ C9 P! T, H6 a  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 M7 H$ `3 G, E: `$ L
  set acceleration 0.099
$ H5 l) a1 q4 w, i% [) m9 Kend
* G  r& a- X0 Y, @& H
) C7 V4 r5 ~' }/ [3 ~  O;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ S9 c1 F" |3 a5 Y
;; and initialize the traffic lights to one setting
% r; S0 s( H9 S: i0 Hto setup-patches
' ]8 D) n, Z% l, m  ;; initialize the patch-owned variables and color the patches to a base-color2 Y2 r% m$ C( G& J
  ask patches+ T8 ^: R+ C' ?' Z
  [( k& f0 b5 n6 b7 R
    set intersection? false
( Q) n6 F4 |; Y4 v3 U5 w    set auto? false
- w& }" Z' u. w7 M" _: L4 O    set green-light-up? true
8 v7 a  T( x8 t& q: q9 v    set my-row -1
) O! V5 k& D. W+ q* _+ f    set my-column -1
0 {' w5 Q( d6 r' K0 D    set my-phase -1( x" \* b* [5 S; l% |1 }8 v
    set pcolor brown + 38 T& |& \" U5 d3 P4 |# f0 j1 f. C
  ]
2 l, A; z2 h2 v2 ]7 W; q, _' R  [# W5 U9 w8 M1 _
  ;; initialize the global variables that hold patch agentsets) h' Z% u$ M7 t# J
  set roads patches with
; T5 R' I2 V' H4 `5 w) [) e    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 t: b+ `) {3 l3 O& O) ]    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 m4 S* o( u3 Y' Z# [
  set intersections roads with4 f+ F; e  P1 z  u/ y6 M
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ C9 o; C2 d% s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 `9 W8 u* ~( n( S. R' Q. [

, x( V( W- I0 d0 L. B; w  ask roads [ set pcolor white ]% R6 e! h& D6 g, E0 l2 N( S+ [
    setup-intersections, m& V! f" ]% S: m% B+ P" n
end
: W5 v, k" o0 a3 g2 i其中定义道路的句子,如下所示,是什么意思啊?) T8 k* O" S' V0 O8 G' g
set roads patches with% x) s: ?/ K+ [( Q, O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. Q* b& M: z; t2 n- g8 {" @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 N- O% M: m& ^8 U7 [* n
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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