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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。6 p) d0 h( n+ |5 [, q. @6 N, W- y! K
netlogo自带的social science--traffic grid这一例子当中,
: G( A- Y$ {; L' W8 Qglobals
9 F' W1 @( A( H, a, U/ i& P6 y$ f[
7 T5 C0 _# k; u) s  grid-x-inc               ;; the amount of patches in between two roads in the x direction" Q' I. o  D4 l& {% {1 C0 l6 Z. [) L& ?
  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 v- z9 g( A' e' w' s
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
( R$ c; A' Z1 o' J3 h  X                           ;; it is to accelerate or decelerate
3 L* ?$ O8 C$ A. q2 o5 u! i  phase                    ;; keeps track of the phase4 _% U7 O' M: u3 o1 E. T
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
- G- P& X2 B; d1 z0 ~0 I$ u  current-light            ;; the currently selected light
- r: z! l( V+ K. d3 w" n6 @0 x8 w; Y
  ;; patch agentsets
2 O% V( R" [/ c  a" D  intersections ;; agentset containing the patches that are intersections
! Y. r; E* z1 K  v  roads         ;; agentset containing the patches that are roads' s: }/ `# B; w) t% |. c& R
]
4 r0 t  M* A9 t" f/ y
6 h$ `0 |+ Y: H+ gturtles-own
! C$ z6 @( u1 ^7 k6 |[, F$ n" `% @9 M( u8 \
  speed     ;; the speed of the turtle
2 [+ W* D# m' Q; t/ s" a$ h, H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 w4 o; [4 j0 @0 B  wait-time ;; the amount of time since the last time a turtle has moved
4 c" Q. x. K" K! V]
% t1 f' d* E: H! H2 _8 {0 l) r+ X% p$ X
patches-own6 j4 C. D9 G8 P- u1 N
[4 n# J# p6 D8 j$ S1 K* f
  intersection?   ;; true if the patch is at the intersection of two roads
3 U+ m6 h/ i& D' T+ p  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
, z4 Q6 S* M2 [. l9 E: ^$ j: {                  ;; false for a non-intersection patches.
" [0 Y! _& x) Z, k8 O$ M  my-row          ;; the row of the intersection counting from the upper left corner of the
( H; P5 Y+ \! q9 D% }0 w# F* \                  ;; world.  -1 for non-intersection patches.  J1 G( J9 x- h. T) t) U4 F
  my-column       ;; the column of the intersection counting from the upper left corner of the
% A6 E* S* Z1 n, s4 D                  ;; world.  -1 for non-intersection patches.: S5 P1 h; l9 U$ ]6 M
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
  g- F( S" m5 A; C) P2 @7 }+ Y  auto?           ;; whether or not this intersection will switch automatically.. O; {0 W& J$ d4 V
                  ;; false for non-intersection patches.9 ~+ j2 @% I/ M. M1 x
]
) v8 U6 j) ^7 z" l5 b, n' V- \4 J: J- Y6 x6 f2 ?' v2 A; C

: L; W% O# K- K( O;;;;;;;;;;;;;;;;;;;;;;
% ^# h% t$ `* B5 C8 v;; Setup Procedures ;;) o$ f# @; `. \" \/ j
;;;;;;;;;;;;;;;;;;;;;;
( W, o* g# s" b! F+ w
9 g* }. x) [9 ~& [;; Initialize the display by giving the global and patch variables initial values.: u, r+ q% p6 L3 X  i& q
;; Create num-cars of turtles if there are enough road patches for one turtle to! x* C( o8 R! }  Z3 ]# P) b! c
;; be created per road patch. Set up the plots.6 d+ {- H8 d1 k8 Q  w$ W, `: |
to setup* K6 C* s6 o) Z( }/ ?, a2 U
  ca, b$ u$ w9 H, h: w1 Z
  setup-globals: S) l; P. \$ }. b

, K) P6 ?# g" p  ;; First we ask the patches to draw themselves and set up a few variables
+ @1 H9 J5 i/ [3 Y7 b1 s: f  setup-patches& G% E& p, a! x8 _1 ~# n
  make-current one-of intersections7 o3 T3 |3 R9 v
  label-current
# z7 }* s" N# h2 o2 G
, g1 v& A( _8 L: ~5 I" n- |  set-default-shape turtles "car"+ t& W" z; K1 \

% [0 q4 y  M$ I0 `8 C6 \  if (num-cars > count roads)
. H; g. Y( \: f7 u  [2 b# Q9 A# ?" V  c- ^. d% b6 @7 r. E
    user-message (word "There are too many cars for the amount of "
" J8 [* w) j4 x# |                       "road.  Either increase the amount of roads "
) s+ L+ b( x7 t; X; q                       "by increasing the GRID-SIZE-X or "
- e: N% p. p1 V0 S2 a                       "GRID-SIZE-Y sliders, or decrease the ". D- ?8 M5 u5 w
                       "number of cars by lowering the NUMBER slider.\n"
  s" R& U, _2 F* M                       "The setup has stopped.")
, f: a5 h4 X7 D- J1 U    stop. |7 B- L4 g; b( e% s6 Z/ ~
  ]0 @$ T$ H7 T. k( Y: m
+ F! C+ |  J; V
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( Y- d% C0 w. L9 R. k: e5 v  crt num-cars
' Z4 u8 Z& v2 ~; O4 C0 N% N  [
- \: s2 Z3 v. d- p    setup-cars( ^2 q" B3 Q4 [3 Q! A9 W$ R
    set-car-color
+ u8 o" S( w9 s7 z4 Z* o# p    record-data
2 D# l8 S, [$ B" s  i  ]; l8 F# c6 L" X

% c, P& _- a7 p  ;; give the turtles an initial speed! m9 A; F- s' G( l4 T
  ask turtles [ set-car-speed ]3 I1 E# J2 A) N1 a9 [" m5 _' A
% L5 ?$ \, y' b. B7 x
  reset-ticks
1 k1 k: V0 i3 }0 kend
, F- q# N9 `0 R3 n8 A, d$ {+ r
7 @! W6 z9 o1 O: L;; Initialize the global variables to appropriate values0 f* c) i6 w, E' L
to setup-globals
6 g" l/ O  ?2 \4 X. g+ g: X  set current-light nobody ;; just for now, since there are no lights yet
5 b2 g% r$ |- s0 S) s* |( U7 H* p* Z$ {  set phase 00 q4 t( s  {5 v' U" d6 l- d8 @" v% C
  set num-cars-stopped 0/ o6 ], Z3 d9 |4 h/ v
  set grid-x-inc world-width / grid-size-x/ X# x, W7 Z- k0 `9 `9 ~+ S
  set grid-y-inc world-height / grid-size-y; D3 o; M6 [0 h9 R' h5 ~

3 W7 ^& v& @/ s  c" I  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# d: }! D# K( I. a" v  set acceleration 0.099' u5 H% v$ T% B
end: r8 \' N" E* n
  }' H* h, g' m6 E4 m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. Y- ?2 O  a4 `;; and initialize the traffic lights to one setting
2 F. e% Z, w5 J! tto setup-patches' Z2 f* \$ Z; O; n0 x9 H8 |  ^
  ;; initialize the patch-owned variables and color the patches to a base-color& j1 X. q* R: s+ Y3 X- d( A
  ask patches  m5 D9 g& D, M: U; _
  [
3 ^# Y/ Q  z  l    set intersection? false9 ?0 Y+ X$ W$ X( N# c
    set auto? false
" d$ O4 h! c3 V" L& B    set green-light-up? true
- j0 a  i: |1 b5 U9 R    set my-row -1
: m% _6 l, w: C    set my-column -1
5 R3 |) c7 ~! |/ Z: c/ I# K1 o  |    set my-phase -1* J# `! J! ^7 d* n7 N  {$ Z' N* I
    set pcolor brown + 3
( l* `/ g$ y  t2 H  ]# X" A" C) J$ J" p9 ]! c$ K( s

1 `( I% \% m" F% R5 c  ;; initialize the global variables that hold patch agentsets
/ B! o  w! N8 _  set roads patches with8 `8 p* a' H$ z; R; |7 H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# Q) P* Q! o9 J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- O: r0 N7 j+ L
  set intersections roads with
) q4 u0 P# w+ p# H3 H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; \" z! L; U9 o% w; k/ T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% P: [' M2 h! b3 M) d( x  s2 e( G, n) }6 C
  ask roads [ set pcolor white ]
% i# \/ {; N. p' i7 U8 r! B    setup-intersections) O! ~: l0 Q8 g0 X
end
6 w; x) A. y9 u( Q其中定义道路的句子,如下所示,是什么意思啊?
4 G% H: e8 W/ l5 h0 ^ set roads patches with
% a7 c$ |1 _2 q# W8 N1 {! F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% [9 a$ ?! i$ d) r; O; v3 c4 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  Y( s2 ^" e! H7 R# Y& c( x
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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