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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。2 _* y3 [3 b2 a& U3 B
netlogo自带的social science--traffic grid这一例子当中,
: _; \/ ~& H' l6 ~. e7 Zglobals5 j" Z5 c! o4 v; E
[- a; L* Z! i% e+ B  r6 U
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 [+ L2 a% y( i0 G' P9 y# f  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. m  o9 s+ g4 @$ M- f% J8 S  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, \( S/ A1 u6 \
                           ;; it is to accelerate or decelerate
" l+ g9 Q( W# Q# W) i  phase                    ;; keeps track of the phase. E& B: b! D8 F' o2 }) Z
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
: g  L9 q' z6 B1 K& A7 A  current-light            ;; the currently selected light
, e: W) u6 n0 S9 D" C$ U! W7 E# ?# E( k! r& g
  ;; patch agentsets2 w6 y6 B* p: T1 ?9 W8 z
  intersections ;; agentset containing the patches that are intersections( e8 |- J5 g6 v
  roads         ;; agentset containing the patches that are roads
% M3 S' V, x) R# G8 Z]
) S; O9 \% ]4 n+ v) v- W) ]* |/ @8 ]; m1 l- f4 U
turtles-own
. B5 D, l# I9 r8 ]8 I[' E# p) d% r) V& P* Z  ^% f
  speed     ;; the speed of the turtle' V, T, J* W7 J9 n
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right" D/ p8 C' h. b- l9 X+ A- i
  wait-time ;; the amount of time since the last time a turtle has moved
9 s/ }/ c; o1 m6 h3 a]4 X- n" ~/ m6 e
% d  |( x: C  d  ^/ A" J6 ^0 F
patches-own$ s) K& @& `$ J
[
; A6 f6 v1 \8 ^# u) B, w- p  intersection?   ;; true if the patch is at the intersection of two roads
; k3 p. I& g5 D  N$ i7 R3 Z  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.2 m, p! ]3 |7 T; x) p3 a
                  ;; false for a non-intersection patches.
9 p% G1 D# Y2 ^$ i1 u  my-row          ;; the row of the intersection counting from the upper left corner of the5 ?% L6 d: K0 P( K6 w3 ^  B, N
                  ;; world.  -1 for non-intersection patches.
. x. r9 ]* y% p4 V1 ]) h' M2 v  my-column       ;; the column of the intersection counting from the upper left corner of the
& J( @% X/ o6 p1 N  H( y, @8 `                  ;; world.  -1 for non-intersection patches.
& z+ _$ |, ?/ n) G  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
7 K5 X2 ^; R5 A# R% h' k  auto?           ;; whether or not this intersection will switch automatically.
; A; {! B) o5 {: N: t( ^                  ;; false for non-intersection patches.5 a9 T$ B0 Z6 z3 Y- Q
]% A( ~8 F7 N6 f- r+ S2 v
# Q# {: J; `4 @0 s$ r
2 q6 ]/ z) z4 C0 l6 E- W0 k% [
;;;;;;;;;;;;;;;;;;;;;;; r/ x7 l# L# V$ F8 R8 W
;; Setup Procedures ;;
/ m$ n4 [6 l0 Z4 U6 g2 |;;;;;;;;;;;;;;;;;;;;;;4 o7 p4 p) z/ f% u% }2 J

8 c$ @  [! B9 \;; Initialize the display by giving the global and patch variables initial values.1 ~5 U+ q, `1 D' E& E  ~
;; Create num-cars of turtles if there are enough road patches for one turtle to
! ~. J# {9 \$ _# w/ L4 L8 Q( @;; be created per road patch. Set up the plots.) O" k) y3 t/ Q- Q1 y
to setup1 {6 ^. {$ M/ }. E1 \& _( T
  ca
0 j% O4 p$ G4 ~1 {" S7 u  setup-globals
* I4 x3 L  f* V9 i) T# c3 b5 t* i, T: L) \
  ;; First we ask the patches to draw themselves and set up a few variables  R1 ^- ~$ b( K& o
  setup-patches
& P7 a  P0 e/ o( u" `5 Y% ~7 [9 T+ d0 i  make-current one-of intersections! f/ t) B; P. B$ I. y5 m& g
  label-current4 _% @: r* B$ e) B' k/ R
; S$ ~) B5 a0 l8 e- q
  set-default-shape turtles "car"! K; c+ }' u% s# \. w
' E# s4 f- w  Z9 q
  if (num-cars > count roads)
0 F3 n' @$ ^$ Q- Q: F  [) @" c1 A$ d- b$ F* w' l' q6 I
    user-message (word "There are too many cars for the amount of "0 ~* x8 ~, y; }
                       "road.  Either increase the amount of roads "2 p1 t, `6 A8 L, S6 ~
                       "by increasing the GRID-SIZE-X or "4 {& A3 X) g6 `. Q* l
                       "GRID-SIZE-Y sliders, or decrease the "
8 P2 a$ Z# R+ _2 g0 P0 Q9 p                       "number of cars by lowering the NUMBER slider.\n"
! t. b! m; ]* {. N3 e1 |7 K                       "The setup has stopped.")7 s7 {) i( ^: C$ C
    stop% Y, L& Q7 @  l
  ]
& b3 O: S4 ]0 s3 q3 E/ N1 x" f2 K
5 {( t4 N/ h* `" s  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: C0 E% y: \6 G0 T7 W0 H  crt num-cars0 h$ L9 C1 A$ V9 O+ |; X# y
  [( p6 r8 @9 Q8 E7 w# i
    setup-cars) U8 y* U& }9 {! ]! \& H
    set-car-color$ R' F) }5 a- V5 |2 t# a
    record-data
; I  Z+ d9 h2 ?- L. E& M  ]: d) V, J" [; y# p  G& r' {

, N  x/ L6 G9 _2 H/ R5 Z" {  ;; give the turtles an initial speed
, {4 ^% |) q. f, r, Y: N  ask turtles [ set-car-speed ]; `. p5 C+ G) j2 g# c

8 n6 J9 F% E" T6 Y3 w  reset-ticks
# [# H8 Y" ?( xend
5 \$ Q, P* i7 ]) U1 U) ^9 G, B1 V0 j, U9 _. [; f4 l9 P$ c
;; Initialize the global variables to appropriate values
9 }1 Q* e8 k9 [/ C0 {. Kto setup-globals& M& m6 {% b5 J9 d5 d* L( X/ t
  set current-light nobody ;; just for now, since there are no lights yet% R+ ^! m) m: |  \
  set phase 00 C( ]% t: ?. K' G. c( t
  set num-cars-stopped 0
8 i! h4 u- h& K# R/ j- m7 p  set grid-x-inc world-width / grid-size-x, H' G) U- f# z( _
  set grid-y-inc world-height / grid-size-y6 ~7 K3 w- j9 @6 g2 S* V
, w+ ]# X8 _' s5 H4 p
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! J0 H7 F) ], i, G, H  set acceleration 0.099
2 x! f# b# h( R& n6 pend( f/ I2 G( z8 H% X& a( V8 S! M( s% I
% t- U0 K# v8 G) ^: B& E5 G6 N( |' T
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 B2 q; k, Q6 `7 T: w+ X: ~8 U
;; and initialize the traffic lights to one setting# |% M; W* O% Q- |% s, _' r
to setup-patches1 T$ |$ W2 a4 ]' {' `% ]* a- ]
  ;; initialize the patch-owned variables and color the patches to a base-color
2 N; X) X+ {) V6 h$ _  ask patches
3 G' Q* V  f; Q! \# Q' h  [  W( B7 L. t" w& |9 z$ }$ r  J. D# y8 d
    set intersection? false- X% }8 _) r9 ]  \6 x
    set auto? false  J( q9 I. w8 @) M
    set green-light-up? true
6 T6 o3 a# \& k; W& G9 s2 C    set my-row -1! L+ r) J# @* ?: P. T; l
    set my-column -1# A$ N6 _6 O5 _0 ~
    set my-phase -1% B% T6 Y: o$ y* j: A5 t: o; A
    set pcolor brown + 3( q. M5 e2 v- ?% H
  ]" {& ~; h4 s$ _" n  }) Q1 b$ M
/ Q: m. y$ \/ {- P
  ;; initialize the global variables that hold patch agentsets' g7 i; ^# Z7 H' o9 J/ d
  set roads patches with' W2 r% h# l. S) \8 u4 P  j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 T; J+ g4 u( F3 {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 d1 [0 O* n) n- V3 C  set intersections roads with8 d6 A% L- T$ p$ ~* H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 f( S2 l0 @  [" ]3 _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 N% |3 p/ d9 m. m3 O( \$ G

  `+ U( }2 ?2 R) C. K) U  ask roads [ set pcolor white ]- k8 s3 l9 V) H- N% G" k
    setup-intersections1 I0 a! v2 M+ d" q' p4 U. E: g/ u
end
7 f, Q5 C$ j. g; M6 ~0 g. n( N/ M" M其中定义道路的句子,如下所示,是什么意思啊?; ?. @+ e# Z, C6 ?& s$ l. S
set roads patches with/ f$ y& A0 n: d: L* _# U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' O7 A7 [$ T/ m+ Z$ ?- K, I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: U, \# S5 h5 e7 n4 L1 O$ b8 }
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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