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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。
; o7 N# x% v* K0 K' q6 ?5 g8 b, ]netlogo自带的social science--traffic grid这一例子当中,3 `) `0 o% e3 _0 x- z/ @, N$ M- k
globals, a8 r0 l! ?! b# _+ C* k
[! N# j# G1 G' U3 D/ H- o0 d
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
" ?7 q! x3 J; U" q5 j) e2 J  grid-y-inc               ;; the amount of patches in between two roads in the y direction' N- N/ P& y' J1 U
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# h$ L" g; h2 ?5 }  ?; G3 l( ~
                           ;; it is to accelerate or decelerate3 L% y/ k  m) T) T- R2 S
  phase                    ;; keeps track of the phase
6 x' |9 u, i! @7 w/ H+ [  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- F2 P& Q0 R1 `4 `( Y2 H- \( i- C, w
  current-light            ;; the currently selected light
5 M! x+ R) Q" v, Z/ `: P9 j" K  L
% h& B) N) L  Z7 l8 _  ;; patch agentsets
! K7 K% Y1 u' T2 x& ?% [% E  intersections ;; agentset containing the patches that are intersections
" N. E1 L: p3 n7 F  roads         ;; agentset containing the patches that are roads3 o+ _; \! w: p
]$ r* A/ |$ d8 O# T8 Z0 s4 L
5 b  c9 D- W3 X( Y4 y# A
turtles-own
, {% M/ o# D- p- F0 `. C7 c5 U. k[8 j" a( g+ @: Q" r4 l
  speed     ;; the speed of the turtle" |# @0 b" q. D: c
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 ?# l4 |! e9 \# |  r2 d+ S
  wait-time ;; the amount of time since the last time a turtle has moved- {& D" \2 I$ W: |0 h
]% e) C5 i/ y5 U( s
& u- w9 ~( G$ W
patches-own- N: x2 M. R6 `" t8 }4 X: D6 s7 h
[  R% C) g8 o0 p  g* z# [' w
  intersection?   ;; true if the patch is at the intersection of two roads+ s: S; u  X/ ~# a/ l; u. p
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* O* j$ M- N$ V# o" w. f
                  ;; false for a non-intersection patches.
$ h1 B+ r" ]' @8 [  my-row          ;; the row of the intersection counting from the upper left corner of the/ n! x% h: J6 t8 h
                  ;; world.  -1 for non-intersection patches.
( W  y7 g4 c! j  my-column       ;; the column of the intersection counting from the upper left corner of the! L' H5 \% F; D- A+ Q' `
                  ;; world.  -1 for non-intersection patches.
' F! U  {7 U2 e* f  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ e" f* z$ g. E/ d0 i, L- V  auto?           ;; whether or not this intersection will switch automatically.2 f. M& `4 V8 [# B) P- ]1 a* P+ E
                  ;; false for non-intersection patches.' E8 r2 M  ]3 `( a' r  C# a
]
; r; k7 A$ H4 H3 {5 [
' Y3 y  @  z4 G0 k$ V# k: r- m8 d" ^8 h9 r' E
;;;;;;;;;;;;;;;;;;;;;;/ f- q2 ?# ~& ~* y
;; Setup Procedures ;;0 h. a3 j( ~6 ]3 i
;;;;;;;;;;;;;;;;;;;;;;2 l  J5 a9 W7 |( v. g

5 V2 \$ \  B8 c" r: m;; Initialize the display by giving the global and patch variables initial values.
3 S$ t. ]) ~2 q% E# L/ K;; Create num-cars of turtles if there are enough road patches for one turtle to
; K6 d0 N/ s( o5 H! x;; be created per road patch. Set up the plots.$ `3 \( Q# r/ D* m
to setup
9 E- j8 X% E: o, C3 C  ca2 L/ Z% _1 p1 k
  setup-globals: \: ?* a) Z( a, P1 k/ j
+ Z6 z$ \0 d3 ^* p2 n6 B
  ;; First we ask the patches to draw themselves and set up a few variables
# k2 u( ~+ [  R+ v5 @5 J& m  setup-patches' e5 M; m3 |, h( ^& s  \8 |) {
  make-current one-of intersections
; T( o( Z& N5 d1 g3 W3 q/ n  label-current
# m3 e) C+ E; N3 p7 w( B  l8 _: s$ R  u
  set-default-shape turtles "car"
2 j, Z9 i$ M) B
/ }/ S& K  ~; S' {, q$ c  if (num-cars > count roads)
; n' [! G0 ], O4 o$ y  [
# t2 B8 u' L: K: D1 a    user-message (word "There are too many cars for the amount of "
9 p; B5 d2 D% a                       "road.  Either increase the amount of roads "9 n* G/ ?# Z1 I) [' x2 h& T: j
                       "by increasing the GRID-SIZE-X or "9 p. f! K$ ~4 N' ~
                       "GRID-SIZE-Y sliders, or decrease the "3 s- v5 y' _  d* u- Q5 @2 f' P
                       "number of cars by lowering the NUMBER slider.\n"- L! T8 O- _, @$ b# T: [
                       "The setup has stopped.")# `3 d6 f  t9 }8 l/ h# q+ ^* B
    stop
9 x# `  c7 A/ S7 i. _  ]
! V4 [4 O: w) g7 J: k% G( h
6 v$ y1 {* V+ ~/ ]* Q" Q3 b" L  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 \. k+ Q. M5 H3 k6 u  crt num-cars! P& H' X* x1 D6 i. a+ T7 Q
  [
% d5 T0 R3 W: Z, X    setup-cars! M" l( |! I& C# t7 N
    set-car-color/ h( r2 j- N) b
    record-data
/ K: L$ T7 T; \5 {' H+ o  ]
2 y0 E; K8 L% C7 I1 I% s( H" x
  ;; give the turtles an initial speed8 Q( T1 [0 x( ?6 m# K  h
  ask turtles [ set-car-speed ], z# _0 M9 S, i% r+ x7 \: B" l

% _0 C, Q; p1 t3 p  reset-ticks
- E0 g+ ^$ r3 w' `2 Y4 Tend. r9 V% R& m; J+ ^
% @% k7 u4 i  L% L
;; Initialize the global variables to appropriate values
, d1 F" w- L6 B8 v' nto setup-globals
$ b# M) V+ `% b8 b+ Y  set current-light nobody ;; just for now, since there are no lights yet
$ |5 y: X* v1 l. g9 @  l$ T+ X  set phase 0
; T( Q4 F4 l9 o) G3 k' \  set num-cars-stopped 07 H0 B5 g- z- e* M# h+ W
  set grid-x-inc world-width / grid-size-x
& b) H" Q% o- e2 e2 F  set grid-y-inc world-height / grid-size-y1 F2 N, `8 Y. ~+ b2 q) `0 s6 c

. _: o& O6 h5 |8 b! i1 \2 ?& q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' w4 q5 u6 H# f2 K, V, ~  b6 k  set acceleration 0.099$ [! r! g% K5 i
end
% s/ z. M' m4 d4 P
; i0 C) f0 h6 K, f2 Z. N;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- {' e9 u% E+ p' g. _: H# N0 X
;; and initialize the traffic lights to one setting
/ N5 s+ R9 I$ ^# Mto setup-patches
% E( r8 t$ I  u, r7 n  ;; initialize the patch-owned variables and color the patches to a base-color
; u4 S3 Z: O. ^: w  ask patches
: o  {" W8 N7 d( e  [
9 h8 B1 b8 s/ d- M- S- j    set intersection? false
* r+ h" ]" p0 P) N  Q# N' X, l8 t0 j, ^    set auto? false' a5 b( t( H7 I9 o5 A0 e* W
    set green-light-up? true
( O& U0 n6 |, g0 Y; f' F    set my-row -1
1 h* C: I( m) l4 t    set my-column -1' b! d/ g7 M* g: N
    set my-phase -1
! B. W9 a/ ^8 `5 Y    set pcolor brown + 38 I1 A; f( d/ j3 `6 d) j
  ]# J* B% S3 b+ q

0 r5 L- ~# `6 ]6 P6 U& B! K2 p  ;; initialize the global variables that hold patch agentsets: u' x/ q& r- y( J. X; ]. t- R
  set roads patches with$ Q# w/ W1 c) L2 h7 d$ C
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 E" k2 ]7 A8 W: b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* P5 w$ a" w8 f2 ]  set intersections roads with3 E' F  `! Z* R* f% t, d/ F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 C; D! R* t  O3 c    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) _% ]& i8 [$ |; Z$ _' S1 }5 K
- d! x2 V' E. o2 f: I  ask roads [ set pcolor white ]
3 ^( H: N$ c1 c. O- R7 ?! S    setup-intersections; _- e7 c. M1 b# Y  f- _8 A: Q
end
1 b, |3 @1 l% c* S8 g1 |其中定义道路的句子,如下所示,是什么意思啊?
# _0 \( f: ~1 C) h7 s set roads patches with
) e% G( ~7 d: z# V1 ]! `5 k    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 U& @8 l/ T! I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% @# G: R0 K$ ^! |" s! {
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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