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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。( g: {  U" }' O- S* {4 o
netlogo自带的social science--traffic grid这一例子当中,7 x( p+ d$ P" X) K4 _- r1 B. I
globals
7 c% b7 H) W5 R  I[
, x3 F4 D1 C& i+ i6 O9 D, B  grid-x-inc               ;; the amount of patches in between two roads in the x direction& W& ?8 I: ~) t  q0 }6 G3 L
  grid-y-inc               ;; the amount of patches in between two roads in the y direction2 F! A9 `  V  h
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
, n: @  ~9 J" o6 Z7 E& Z                           ;; it is to accelerate or decelerate
1 |* u# t, `& P, R) ~6 A  phase                    ;; keeps track of the phase
0 Y; e" Q5 m( [  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
) E7 v( I) X, u& N4 S9 X. u  current-light            ;; the currently selected light5 T$ o$ b& g) _1 t& J: g$ _

/ g/ e8 K1 R9 t6 J  ;; patch agentsets0 U. O# E. z( m2 N4 j+ a5 m, P5 z
  intersections ;; agentset containing the patches that are intersections
* g5 G  J4 Z/ D0 O  roads         ;; agentset containing the patches that are roads5 a& v$ x" f  J, Q
]; m* c3 g; s2 M* r7 A; J$ I2 r- b
) G3 j! s2 I9 q0 r$ c
turtles-own
; q, |) p; ?8 s7 f6 T[  t) H' `3 q% }
  speed     ;; the speed of the turtle' t1 g1 y. J8 `3 n) t8 y5 A
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 s* i# x( ^& e, ^" `0 p* X; }
  wait-time ;; the amount of time since the last time a turtle has moved$ A2 f- b$ g* l  @# I$ w5 z
]- }% T, D' F2 A7 R' J/ w; j

2 ~. q8 @, o. }patches-own. l8 [1 f, P$ }4 V1 I, e! d
[3 s0 U( W' S4 \5 A' q
  intersection?   ;; true if the patch is at the intersection of two roads0 }% c  L% Z" |" K1 G+ E
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.% H8 Y8 W. |8 W$ i* L
                  ;; false for a non-intersection patches.
, c% F& X/ f2 e* g- x  my-row          ;; the row of the intersection counting from the upper left corner of the
! V1 U2 h9 k. ^1 w3 @( D                  ;; world.  -1 for non-intersection patches.# @% `; d# l- ?0 T, ?
  my-column       ;; the column of the intersection counting from the upper left corner of the
# z& @4 i2 z6 E4 U, A                  ;; world.  -1 for non-intersection patches.
& H/ s: o. L% E  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 S% A  R. `$ M+ f& ~6 K6 L
  auto?           ;; whether or not this intersection will switch automatically.9 \% U' d  @$ P! L7 U4 z' _- A0 U
                  ;; false for non-intersection patches.1 ~: e# E# b% }; n- s
]2 z1 `- g# _8 f

" d7 ]; A/ e5 |& v2 X6 j2 ~. U6 M7 Q8 Y/ s% ?
;;;;;;;;;;;;;;;;;;;;;;! U+ j3 e* u9 @( ?
;; Setup Procedures ;;
5 r4 y  O+ |$ ~8 I;;;;;;;;;;;;;;;;;;;;;;- J+ R6 j1 [9 H! E2 X' U2 i( o

  d+ |! ^" l4 K/ S( N2 d) Z: F" P! l7 [' w;; Initialize the display by giving the global and patch variables initial values.
1 }1 a$ R! D/ ?;; Create num-cars of turtles if there are enough road patches for one turtle to$ m& }- b9 Y" G7 M% U/ h* u4 H8 _
;; be created per road patch. Set up the plots.! Y. |* D- F  h% \2 y: x; Y
to setup" r; Z9 c# n$ d7 H
  ca& n/ f/ b5 m* ?; {4 F0 L
  setup-globals
6 a9 f8 ]7 @" K2 n' p9 j
1 @: \4 \1 P# d: J  ;; First we ask the patches to draw themselves and set up a few variables
2 z" }* ]9 j) R  N' S  setup-patches# }& P8 Y  m& {3 L8 B, h9 [
  make-current one-of intersections
* F/ L9 x8 k% d' q  label-current  a" n! Z- T2 V, }& r
7 E9 m3 s% _( @: S  I3 B
  set-default-shape turtles "car"
- |& N8 _& u1 H% s! {7 {6 T1 q2 i2 D( T+ q" F5 x0 N$ V0 u
  if (num-cars > count roads)' c' i! p1 A5 e: x. @) C1 c$ t
  [
) ~5 h4 T9 g, G; d# x9 A( s! G# K7 o    user-message (word "There are too many cars for the amount of "
, }( W; ]! ]) u: W                       "road.  Either increase the amount of roads ": l( l$ Z) q# F$ A: `4 {# Q
                       "by increasing the GRID-SIZE-X or "6 F$ L1 K) T0 ]1 G
                       "GRID-SIZE-Y sliders, or decrease the "
: x2 Y( S& S% E( ^% i                       "number of cars by lowering the NUMBER slider.\n"' |- ^# m' d3 v( E1 A* _6 ~+ _" l
                       "The setup has stopped.")
5 {3 |$ G1 k4 |. i! r    stop
$ m; `4 G  a0 }- n8 P/ G  ]9 d! P, s% n; a
! v2 S, C! C6 I% w5 j2 S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: F; R5 g  g" j* Q  crt num-cars* ]  }/ I1 c4 o1 L) n
  [; ?' Y( k5 n  }' \+ Q3 f! c& T# T2 l  m
    setup-cars
( P1 E( Q2 R0 S! w( c    set-car-color  W  r$ ^* I; M# I9 w7 U" X
    record-data
" M8 _, H* w9 P* y" C& L8 A/ D6 p  ]
: O0 s: I! P6 U- f6 x6 D1 u, {8 b6 w- v4 \" n8 R: s
  ;; give the turtles an initial speed
% k  w2 r7 U9 e  j; A* t# x  ask turtles [ set-car-speed ]
; w0 A& Z6 o( l" G& N
5 J0 y) {7 `. L: v5 D  reset-ticks
. J) t8 l1 F7 s. C: b9 o% G; p+ nend, @& v; `+ ~* H/ M8 Q6 `7 {  [
, t& W* l1 Q- R7 z. S8 W1 X
;; Initialize the global variables to appropriate values: Q) R7 U& a- c( y4 f1 b8 t
to setup-globals5 Q+ w3 G2 X5 P2 B
  set current-light nobody ;; just for now, since there are no lights yet" F) K% Q0 Y2 L9 `( X
  set phase 0
: z8 B, ~( h/ _8 g% `6 ^$ f# e  set num-cars-stopped 04 C7 G7 w$ c5 R3 i+ a# \5 e; h
  set grid-x-inc world-width / grid-size-x# I! Q! T+ D4 E- ]- A; x
  set grid-y-inc world-height / grid-size-y
$ j" V# i4 K* D' [+ {4 i0 j$ U" D) F+ }* ^
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: P, q8 [- o5 ^  set acceleration 0.099
; j* `( D7 d5 \% y/ Y* kend
2 k% }6 R3 }, ~: K7 \/ \( I
+ j, n) b0 k- {% `;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 l/ k  X5 d& n1 N: G* U$ ];; and initialize the traffic lights to one setting
1 [5 Q% ?7 A( K+ y8 i& tto setup-patches
( J5 J0 T5 n; U& U  ;; initialize the patch-owned variables and color the patches to a base-color
) \! @1 X2 [0 @3 ~  u  ask patches
) @; M" O  S) V6 u7 ~# M- z5 U/ |  [/ a. R& {/ Y4 a' R$ \
    set intersection? false
/ ~! J- M* r% F% T    set auto? false6 g/ I0 s; ]  [! @* ^8 C! E
    set green-light-up? true
; w; o) V3 y; P  R) _    set my-row -1' t5 U1 u: Z2 D
    set my-column -1$ R+ m$ O/ `8 Z' v& j2 H
    set my-phase -1
& `" ]9 g5 Y4 Q  C- v    set pcolor brown + 31 t/ E2 c- N4 V, V! t6 Q
  ]
, D2 t7 H- d/ k9 I
3 N0 q1 c0 O' P  ;; initialize the global variables that hold patch agentsets
/ R2 s9 |: ?6 i9 k8 M- M+ Q  set roads patches with
$ ^) ~! ?# D8 [& F/ {& D8 G$ }# Z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& v& x' w% @) d5 Y- P9 J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 \. A7 V- V! I& [7 j  set intersections roads with5 P2 j; E' C$ m- [' x# R# c. O
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 i1 F  x! t# u. {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- b; `, x2 S; H/ w; c$ g5 y* g$ v& `4 {$ \% W, |1 N: {2 I$ C8 U
  ask roads [ set pcolor white ]
9 @" k. ^& c5 \6 i9 @& f7 E, t    setup-intersections
  d$ W+ {  G6 zend
/ c, k7 [+ i0 v其中定义道路的句子,如下所示,是什么意思啊?; R& Z) g) N9 B+ I/ ]- o  G- P
set roads patches with' H) B- m' e+ ^) C5 ~6 o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 l" D' ~. p2 d9 H9 H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ _  O, c! X" e, U1 Q$ H1 U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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