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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 _6 ?1 X! a8 A+ d8 @! w! Nnetlogo自带的social science--traffic grid这一例子当中,' f0 ^+ b; Y8 B/ J5 N) L) D3 x
globals$ }! r$ @, U; }  i2 a. D* _
[+ e$ G4 K! X( _/ `7 S
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# t0 X$ ^5 Z/ F5 C# M* Y- L  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. p' ]$ e/ G$ e& l- H6 Z5 [) H& D  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
5 O$ x5 Q" K4 c/ \                           ;; it is to accelerate or decelerate9 U" W8 i+ ]0 y' Y" T
  phase                    ;; keeps track of the phase
  B2 X" D" w& f/ N  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
8 S, O$ t0 g8 x  Y  current-light            ;; the currently selected light* g; o* U/ g" u1 c. N9 I

4 x4 s( ^- x8 u8 n  U/ t  c  ;; patch agentsets
$ [6 d+ l6 m5 x; L  intersections ;; agentset containing the patches that are intersections
0 X! u  D8 |5 ]$ R  roads         ;; agentset containing the patches that are roads, T) ~: \3 [- {6 _/ B$ l
]# P& l, o! p7 V  _

& \  Z. Q# u2 m/ F1 M/ h/ zturtles-own
9 m1 D& U0 m6 \; @# H[4 D  `. Q# U3 P
  speed     ;; the speed of the turtle
; I5 Z) N5 z8 y1 \7 M2 R. M  up-car?   ;; true if the turtle moves downwards and false if it moves to the right/ w- F1 z5 a- I
  wait-time ;; the amount of time since the last time a turtle has moved
2 R4 G& L5 n1 @( ^]2 o: k3 C" _) _& h
) I1 g) @' k% o
patches-own
$ x- ^( \2 y1 \) g6 c5 [[
* Y# h( w1 r+ E/ S& T  intersection?   ;; true if the patch is at the intersection of two roads2 ]# F: C( A/ t0 W4 Q; M
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.' |+ D. c6 R; x7 X3 ?) p  J9 n3 n
                  ;; false for a non-intersection patches.5 u6 S) f5 ~) n+ e4 B2 K
  my-row          ;; the row of the intersection counting from the upper left corner of the9 O! Q" s! N$ }& ?9 B
                  ;; world.  -1 for non-intersection patches.1 e4 ^- R+ ?# q+ |
  my-column       ;; the column of the intersection counting from the upper left corner of the
6 I) l9 d6 ~4 o' a- W* R2 m, P                  ;; world.  -1 for non-intersection patches.
1 _7 S$ g# ?- r5 H; D/ E" o6 D" R  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ E, p1 Q" {# U. X2 {  auto?           ;; whether or not this intersection will switch automatically., p6 J. }# Q. K. r' Z0 u. w  l$ b* L
                  ;; false for non-intersection patches.
: O6 w9 ]2 D, o% N1 D]: e5 i6 \2 b' ~  J/ x; l/ S
$ w- |+ d. O4 a2 u- r5 ^' w; S

. |1 P! @- G5 U0 ~/ \, q1 g( N; Y  p& Y;;;;;;;;;;;;;;;;;;;;;;6 {7 o3 H1 j; e- Q; E$ r" l6 M
;; Setup Procedures ;;( i. I# m% z3 J- o4 h1 r
;;;;;;;;;;;;;;;;;;;;;;  @* B1 O7 ~$ z/ H! t( b
0 M$ c% t' q' U
;; Initialize the display by giving the global and patch variables initial values.- q. x0 f7 ?9 m) ~, J; w6 N; ?
;; Create num-cars of turtles if there are enough road patches for one turtle to" E- L2 t! V  Z4 `1 v7 t5 y1 g* q
;; be created per road patch. Set up the plots.
- }5 a  Z: x3 L# v5 I0 @to setup
1 Q6 Q# d5 U8 f  ca
" L' W* R7 _$ P, X5 ~# Q6 k  setup-globals# U' Z# n/ N: d. I# X6 W1 B
: y( y: v" p5 d; J  M1 T0 v7 ?/ p
  ;; First we ask the patches to draw themselves and set up a few variables
3 {# F, Q& H' S  setup-patches
" S" h" u9 j6 R6 x& M  o8 u  make-current one-of intersections
. j2 _3 B5 s5 Y. x/ `, p$ {" b  label-current& s6 l7 A" W+ C" O0 o( i

. l: ]% f6 B! B* ~8 z  z  set-default-shape turtles "car"
8 d4 y# f! H( I  j! n, e9 l2 S( S
  if (num-cars > count roads)+ e/ u& k+ @( X
  [
  N- y8 b$ v. C/ m# c' [! Q# @    user-message (word "There are too many cars for the amount of "
$ E$ L' W' ~7 h. ^                       "road.  Either increase the amount of roads "
  D/ L( K+ j& D4 e  Y) v                       "by increasing the GRID-SIZE-X or ". K/ e+ b4 h* x* a' R' e
                       "GRID-SIZE-Y sliders, or decrease the "6 o! [, n) d; a1 N0 w2 x' `
                       "number of cars by lowering the NUMBER slider.\n"6 C# ~; B6 z& J: v  `/ J
                       "The setup has stopped.")
9 |1 ]$ |, a1 l% ?5 t* ~. c( ?, h    stop9 t5 D9 Y5 _4 C* n1 }4 |; n+ j. |
  ]
, @" F+ R' h$ d& E3 L. D  B" L& |/ _# v" t: n  [
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- w, I8 n9 ^  g0 H9 k7 N
  crt num-cars
* }. g1 R$ `' K5 X" ]" E  [
+ V& I# P- i* v' h    setup-cars
( M! w7 M* j( ?7 t! J$ X4 m* }" j# U    set-car-color
8 ~# G, j- P8 _' M    record-data
1 A8 _2 d' a! |6 G2 Q7 C" _) u  ]
3 u1 h( k$ K. q% S- i3 s  a8 |3 [# X8 v3 D3 s4 J
  ;; give the turtles an initial speed
/ n) r. ^& X5 K4 V7 w! \  ask turtles [ set-car-speed ]
# M! J2 y$ @- c6 {4 X
& z' }7 x$ p5 B  reset-ticks  [' R. `9 x) |
end
  Q( n7 A, |: z' P% h2 t: i: m
# ]1 O! r0 I' m+ ^5 H) c) F;; Initialize the global variables to appropriate values
5 Z6 y; S9 _8 c$ F# d2 Y: ^% Ito setup-globals
8 u: X3 C+ V+ F  set current-light nobody ;; just for now, since there are no lights yet
$ c4 Q* H7 S0 r( q5 Y  set phase 0( I2 b6 ^" P! Q, F) d1 d" I
  set num-cars-stopped 0* S9 A0 @2 [0 d1 S
  set grid-x-inc world-width / grid-size-x
2 M% O: n# t7 I! }( n+ g6 Z  set grid-y-inc world-height / grid-size-y
" V  A5 _% H# F8 E, \$ f6 J( A- y. {: L/ l
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 c, B& R# y7 |
  set acceleration 0.099
+ `( ]0 K: K: T  O$ G' [2 Uend. O) t" ?& H: H5 }7 Q' {7 H

8 _" _; A. Q7 X$ i& R- J5 f' `7 m6 X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" {4 i" |8 Y& ~. e" e) R2 H;; and initialize the traffic lights to one setting
) [+ b' X6 _1 f7 @4 Zto setup-patches( z% ~4 h/ m6 `4 G6 v
  ;; initialize the patch-owned variables and color the patches to a base-color
) b1 h/ d* A9 D0 p6 D6 n  ask patches0 m( U) I# a& T" H
  [
  S. k' W4 ^1 f3 A  I    set intersection? false
* V9 h4 E" N! a$ ~# _    set auto? false. v4 L9 [0 z% j. Q: f3 S" M- t
    set green-light-up? true
; b2 O9 @! y- P0 q2 @8 ^  X    set my-row -1
; p1 k: A7 s. `2 H    set my-column -1! V6 m+ f, L0 S- ?, n! I
    set my-phase -1; e% W( F+ V9 V, S* T! P& ~
    set pcolor brown + 3/ |4 Y; l6 [- K% P! I
  ]
- N% Q- ?. M- l3 P0 D. |6 [& R' O- Y% D- G4 E9 }, L" y
  ;; initialize the global variables that hold patch agentsets% t( X# ?1 T% j# B' E( ~. T. k: a
  set roads patches with% [/ g7 T* Z9 E+ E6 g. ^9 n0 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% d) ~& i2 h4 `$ _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; j* `- q8 v( x* m, p4 z$ |  set intersections roads with
& b* l+ W# h3 y4 b    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 q( k7 v% D) m7 p* `# z  Q+ I# [' @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' i& K* P+ T5 X, g7 H4 D  Q) E7 d* {' ?, E7 B% y( m8 V* ]
  ask roads [ set pcolor white ]9 v( q$ @- L& s( ?* K: V* X9 f
    setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
3 W8 T4 G4 l# [  R- k$ j- \6 u set roads patches with
. `, I+ j$ q) D  A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" H( i4 T9 @9 m3 x& d" e/ G# }' W) k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 v0 X. h0 v! [1 @. T% w( h! J
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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