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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。. ~1 e! X( Q+ H% W" l
netlogo自带的social science--traffic grid这一例子当中,% a' ?2 Y+ J0 A( d& ]
globals# \# P( q9 Q/ V# f! l& {& Q
[
9 I9 z8 O6 b8 ]  {* {) N4 Z  grid-x-inc               ;; the amount of patches in between two roads in the x direction; h* v* c- u" Y2 h. ~: ?
  grid-y-inc               ;; the amount of patches in between two roads in the y direction) ?/ a) B( F% m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) ~  Q" Y5 g7 Q6 l; |
                           ;; it is to accelerate or decelerate
8 p' p) D/ N3 U( r  phase                    ;; keeps track of the phase
# N1 U1 S( k! y) I4 x' p- I$ W  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 B3 c3 T' j! {: ]/ f; k" J6 J  current-light            ;; the currently selected light
/ {. C8 `6 m4 u8 ~* ?! c8 A+ B# ]# O3 y
  ;; patch agentsets8 p  [9 \3 u' s$ I8 F1 [( R+ V- q2 E& U
  intersections ;; agentset containing the patches that are intersections$ D% o% }, h9 V0 r" U1 x/ E  D
  roads         ;; agentset containing the patches that are roads  c1 E7 Q8 a+ q4 u! S
]
) c% y1 P/ O- P1 W# Y
9 f( h! Z0 A9 P% Jturtles-own  l6 g7 ]6 C7 T" E6 \( d
[
1 ?' V4 q  m( P9 h$ c# i7 g  speed     ;; the speed of the turtle8 n8 c7 E) f8 H
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& S9 |9 p: P: N9 _$ ?3 m# E  wait-time ;; the amount of time since the last time a turtle has moved
7 r& e6 O+ @' w% N- _5 i]3 T! M2 k1 D+ {: {, `3 \
7 V6 S+ h& a* j" a+ |% ^
patches-own+ v+ y9 w/ ?0 {# F9 w4 h, S& V% u
[
% D( T# ~+ Q1 P  K+ B  i  intersection?   ;; true if the patch is at the intersection of two roads
$ ]4 M4 E9 K8 R3 {3 K  green-light-up? ;; true if the green light is above the intersection.  otherwise, false., ^& }8 I$ @1 T" Y6 e
                  ;; false for a non-intersection patches.* a0 @: G2 y4 a5 [: x! M, c
  my-row          ;; the row of the intersection counting from the upper left corner of the1 K" n  [5 M% O" Q
                  ;; world.  -1 for non-intersection patches.% k  J5 \" T* y1 ?
  my-column       ;; the column of the intersection counting from the upper left corner of the
- N; [0 r0 ~' U. z                  ;; world.  -1 for non-intersection patches.
" A) F! f# p/ A# |$ h8 o  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* I' b+ N  j$ w
  auto?           ;; whether or not this intersection will switch automatically.
% J' i7 E/ [* B5 s' g3 h8 q                  ;; false for non-intersection patches.
7 z6 p& T$ A/ E]
, c5 t" b+ U3 P% x3 v
) ^+ L  X$ D9 ]' u
, b9 @. Q8 l5 s% F/ K;;;;;;;;;;;;;;;;;;;;;;' k" a* n7 T0 I# r' g  M7 d
;; Setup Procedures ;;
7 J5 S2 Z: r5 d+ X2 _" a;;;;;;;;;;;;;;;;;;;;;;
. F  H; V# h9 t. a  D7 K
0 w8 Y& X( I% o( Z% Y% W% C;; Initialize the display by giving the global and patch variables initial values.% M. o5 d- M# P3 [2 i
;; Create num-cars of turtles if there are enough road patches for one turtle to8 l! f& F0 e! f# C# T3 p
;; be created per road patch. Set up the plots.6 q8 @7 J' r) |; x' x
to setup7 o# b5 m- M) v1 }- b# _
  ca
, e1 d5 @9 X( \  setup-globals
# }* x, V3 {. o7 i  A9 m" s: L3 k6 _2 {- ~' _8 m6 Z5 x
  ;; First we ask the patches to draw themselves and set up a few variables' s+ \1 r" b  _7 l; }
  setup-patches
+ O" D' t3 P9 f, e; n* S9 |, \  make-current one-of intersections1 q4 V3 ?$ }* f% }- Q4 C, _# D
  label-current
0 q1 b5 z+ Z, O2 I5 c
- J! L5 v1 A5 o  |3 J8 F  set-default-shape turtles "car"% c4 ^8 ~/ R9 T; ~0 q; E, a
  ^6 a' t0 A- }( z/ h$ u
  if (num-cars > count roads)- h/ l$ I4 X2 V
  [+ s/ v4 `: `5 P4 q* b0 }
    user-message (word "There are too many cars for the amount of "
7 n+ n3 \/ I4 G$ H6 A                       "road.  Either increase the amount of roads "
1 l( k$ u7 k1 M. l5 J7 R4 t! b3 u. b                       "by increasing the GRID-SIZE-X or "
0 r4 N; x& o1 b$ k/ X$ H" K                       "GRID-SIZE-Y sliders, or decrease the "- o6 l( N9 O. t" V& Q
                       "number of cars by lowering the NUMBER slider.\n"
* M, `' w  c! w: s! D0 G! n                       "The setup has stopped."). q+ I  V4 G9 J, I& B
    stop4 Q" m% ], N* d$ O
  ]
6 l6 x: |" X/ k% [; ~: G- I4 T( Z8 I/ I, o6 D8 q6 r% S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. U% d9 A; q4 x6 m" G8 V  crt num-cars
. _8 ]: |. a) A3 I3 z  [! R7 V5 o, n! g. U3 r; B
    setup-cars) b" u9 A% I+ a
    set-car-color
4 o0 M" g% P6 H6 _4 ^' S    record-data
2 D' O' |9 m. b  ], G+ z' \* D, {/ |7 w

4 Q5 r. g8 ~& P! x: x& o( ~  ;; give the turtles an initial speed6 T/ W: t, Y- v6 a1 p
  ask turtles [ set-car-speed ]4 ^4 Y& w. ^7 o2 m# \
  l1 R$ d+ l. E. |' q  d: }- H( F
  reset-ticks
0 Q+ n+ x( Y  U0 u! pend% |6 {* v4 G2 n; @4 p9 H
# k2 k; X/ L* A- v1 i
;; Initialize the global variables to appropriate values
% B9 M8 l) s9 ~+ o$ j, p( j# C- tto setup-globals% O9 m% D3 y& q$ g
  set current-light nobody ;; just for now, since there are no lights yet  _& |( d& u6 E( v
  set phase 0
6 Y; \4 ]( G/ N( ^, x  set num-cars-stopped 0
3 J% Z  W: p! L2 x  set grid-x-inc world-width / grid-size-x
  c9 s! {. U2 A: O& s2 J- w8 a0 @2 `  set grid-y-inc world-height / grid-size-y. n, X" I, T1 U9 u. N+ w

6 i, b3 Q3 F; n  C* c  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, s+ m( J4 @3 x" r+ V6 Z; M' u
  set acceleration 0.099
  d# p2 W9 N/ U$ w) c7 g# ]end2 c6 K% H( ]  N; q, w* J
7 V% a: x! R6 M3 l/ C1 ?
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ E# D# Z( L2 g' m
;; and initialize the traffic lights to one setting( F5 y' j& V, t6 \) w( ^' Q
to setup-patches7 G1 h6 @0 O1 s) @. T$ e
  ;; initialize the patch-owned variables and color the patches to a base-color' ?2 o* |/ E! V' |) Q7 y$ v$ I5 X0 q
  ask patches
( L) C) c, c* A, b5 w  [
; L5 |  t- k  L4 Y' r    set intersection? false% j3 A! c  s# U5 ?$ Z7 A
    set auto? false+ n  f9 S# d: y4 N
    set green-light-up? true
0 U6 m2 F% f1 k1 G" R5 z5 O    set my-row -1: q! m7 B+ j6 ~1 _& B, G
    set my-column -1) E+ p2 _$ [; A6 T9 c( F& `6 b
    set my-phase -1
# l1 p% T8 Y6 R& f$ q# P! J    set pcolor brown + 3
. ~. X  j( @& U, Z6 {7 U  ]* |, f! H2 L% V$ ?4 d
' L1 d4 w5 q% u. Q/ l! q
  ;; initialize the global variables that hold patch agentsets
6 o* `  O: W+ b9 Z  set roads patches with% S' [' j+ i5 b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 ^/ O, m* i* ]  B- O8 E    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 {( A# i8 E8 y7 q4 n  set intersections roads with
, i& o4 X; X$ U) Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 k. L! [( z% O9 r' ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 Y% c7 O: k# T$ _. n

0 v0 r; e0 ~9 \8 S1 s  a$ h3 l  ask roads [ set pcolor white ]
" ]/ t3 z3 P; A- E; G2 J' c+ m    setup-intersections
5 R# {' r+ ?3 ^! Kend
8 R, ?5 g$ |3 Y+ J" e9 b其中定义道路的句子,如下所示,是什么意思啊?8 v; o  Q5 i; y! [5 K+ v. D
set roads patches with
) m& ]$ D! M5 R) F9 a  ~4 K. S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# X! c+ n0 {5 T9 `! r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], q7 m; z' B/ ]! p4 M0 g
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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