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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。
/ b% _% x: p1 D  ?netlogo自带的social science--traffic grid这一例子当中,
3 s0 J, i7 n, W, u" j, S4 A' v. x6 o" @globals0 U9 c( c, i! b( W0 e/ t6 @, [! T
[
! ?* {' H. \, B2 s; b  grid-x-inc               ;; the amount of patches in between two roads in the x direction
5 w$ r9 D' q  n$ e7 ]# S( S  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 j% y# O3 r0 s3 B$ e2 p# l: `5 ]$ U9 L
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ r$ J1 C7 w, \" O3 P
                           ;; it is to accelerate or decelerate, e: y7 T  z* I" a* V) _
  phase                    ;; keeps track of the phase
7 u) p; e& y. H3 y" Q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 v% `* c5 m' [0 K0 |% }; R  current-light            ;; the currently selected light3 y( k% c  L, r

0 v3 i5 F: W$ E* D+ g4 A  ;; patch agentsets: @$ c7 J. M5 u& G) U- a' w
  intersections ;; agentset containing the patches that are intersections
1 D; [: V7 |- v4 R4 `  roads         ;; agentset containing the patches that are roads- j* v% _* z( \/ t! ?$ W
]1 B4 X0 A1 f* Q, U
2 k- @2 S) x! m- s
turtles-own) V8 o2 p' w2 l% [" E4 t
[
4 c) L2 u2 p4 |9 Z; E  speed     ;; the speed of the turtle) ]% e# j8 o7 ~9 G$ z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right! `2 @0 f  c9 j) S8 z8 }+ R
  wait-time ;; the amount of time since the last time a turtle has moved
; ~9 E/ D: l1 @]0 |( ^. u/ f  W1 }7 h
; F0 u8 E6 V3 d$ Y, y
patches-own
% P! N2 a4 i) m0 K# E1 i2 c[
. {* |3 R" @# z3 Z1 C% {  intersection?   ;; true if the patch is at the intersection of two roads
2 C& f* y( ]  F5 A+ l  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ `) [7 b: |8 r; s( E" |; I                  ;; false for a non-intersection patches.6 G) f( u$ z! `: F6 P' ?  _
  my-row          ;; the row of the intersection counting from the upper left corner of the& U9 X* I- w! z0 z. e0 o
                  ;; world.  -1 for non-intersection patches.
+ d7 }4 U1 _% T% D( u* e  my-column       ;; the column of the intersection counting from the upper left corner of the: D5 t% w) F3 R6 |" f/ e1 j4 L
                  ;; world.  -1 for non-intersection patches.$ `. M) H# ~; L+ e7 T9 `  P
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 V; E4 A: T9 P3 {3 @& n  auto?           ;; whether or not this intersection will switch automatically." }$ B6 t. Z0 Z  D
                  ;; false for non-intersection patches.  ^3 K" W. Q+ z. k
]5 X; h: A% [+ h2 X

9 N8 m! M9 U9 o
- p! h+ H+ n: P+ `( X;;;;;;;;;;;;;;;;;;;;;;
0 z$ \( V9 Z6 G  i  D;; Setup Procedures ;;
/ b. P2 Y$ W9 B) j  A! X;;;;;;;;;;;;;;;;;;;;;;3 ]4 h9 H9 m) H
4 Q* t6 p# O* x6 B1 D6 N
;; Initialize the display by giving the global and patch variables initial values.
* w$ A7 l" ]. e5 b3 P  f! K;; Create num-cars of turtles if there are enough road patches for one turtle to
( G4 ]. k/ c( A! f$ N4 p;; be created per road patch. Set up the plots.& @; S" m+ q- N  W# O, Q9 D
to setup
% O2 o5 m2 i: k, d% z  ca8 e& m# O  U. N: w6 V" E$ K
  setup-globals
0 p& m8 _; c& c9 g7 ]6 N
" U9 S4 Q. W/ h# u" S  B; E  ;; First we ask the patches to draw themselves and set up a few variables
8 `! K+ \/ y0 E; m  setup-patches0 \; U( T* W. S8 @, N
  make-current one-of intersections
+ ?6 q6 ?" `  }  label-current' t, U7 z' A, \6 t. W& L: Q3 l

+ }, D' C. ~" Y% l* N  set-default-shape turtles "car"
( O5 i  y' G: y! ^8 k+ X/ q
! y) a5 I! k9 I  if (num-cars > count roads)
1 P; ~* z% y5 a; r* ^4 P% g9 t  [  @' f$ e9 H" G; }7 u
    user-message (word "There are too many cars for the amount of "5 t; f2 O; v  b& `1 J/ U3 ~
                       "road.  Either increase the amount of roads "6 Q: X, H/ O( I- @
                       "by increasing the GRID-SIZE-X or "
0 _1 |3 @3 w0 {5 {% o  [7 F  V1 R                       "GRID-SIZE-Y sliders, or decrease the "
3 _" g! u! g+ c' ]5 L3 I                       "number of cars by lowering the NUMBER slider.\n"
, L0 g$ u6 ^- L( d: g: m' b                       "The setup has stopped.")  I& V( I8 a; a; J  j5 V+ L9 _
    stop0 s8 T  O7 i' o$ R; Q0 [
  ]
2 m0 z/ x8 F2 d* X/ L0 K( l
1 a, `& m; z  k1 y3 Y7 b5 Y  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  A* Z" N8 Y/ i% |
  crt num-cars9 k6 z; D; M# T! p, R% G% u
  [
$ z/ Y, B3 A3 ~6 c  `6 u- c" F9 e" o    setup-cars
. ]3 ]6 i) E& }* J    set-car-color
- l6 j- n* L& A7 u    record-data
( @6 ]* f9 [3 K% _# Z: A  ]
+ K: y; A8 K& _' }9 w4 W  I
9 {! M1 u9 l6 C3 p0 {& _  ;; give the turtles an initial speed) {: j9 S) b/ q  {" K5 k2 K
  ask turtles [ set-car-speed ]
" N, e2 e+ B" m. A: r* A
# i9 E! `! X' O- R. m% |+ m  reset-ticks
4 J% \( k% O: w" O. C- eend
$ p: }7 N* p7 {* K$ Y5 F
' p9 S5 R+ J" O" l;; Initialize the global variables to appropriate values
3 h! `: x: Q0 P8 Y, dto setup-globals: K6 _% ?0 H" d9 g
  set current-light nobody ;; just for now, since there are no lights yet. {3 K$ L2 p# G; c, B2 X& i
  set phase 0
: ?" {% y& h; }" x2 X, g  set num-cars-stopped 0# m$ L; q: ?; N5 x
  set grid-x-inc world-width / grid-size-x+ L, h9 ^2 @& v  ]/ `
  set grid-y-inc world-height / grid-size-y; P% t$ a- P! ^7 V2 ?5 J
& q( c" r& w( ?7 n% x
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 b3 M: J$ k6 _8 Z  set acceleration 0.099, I0 x) Z8 ]9 R
end
: L0 Q% T% a# q7 d! v( ]* W7 f: A  o0 d0 n% ~
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 a% p. }$ N4 V9 f
;; and initialize the traffic lights to one setting
/ ]1 @9 W. i* cto setup-patches
# }9 p' c$ b5 j2 N  ;; initialize the patch-owned variables and color the patches to a base-color
. b, X$ u% x: p! t9 Y  ask patches
7 y  c" a9 ?2 ]" i5 u  [" l+ Q5 \; M, U( Q% D  R
    set intersection? false
  |7 t  s) B4 T+ j! d+ F    set auto? false; q4 H0 I8 v4 k  J# o$ Q
    set green-light-up? true  s3 n) o2 R* H. j* C
    set my-row -14 O/ i& Z4 U& @/ c
    set my-column -17 L  m4 L. |  E; ?0 J1 q6 Z+ H9 Y
    set my-phase -1
+ l4 u, M. A: y/ k# |! s5 k    set pcolor brown + 3
; x$ B2 a! s6 k4 G( `  ]. Y. ~& _5 s3 w$ `+ K
$ y5 {" y# v' V; H5 s4 a& I. F
  ;; initialize the global variables that hold patch agentsets
6 \4 n2 z- M5 x% w  l  set roads patches with3 R9 a/ l* H$ [# x' u( G# H, l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ c. t3 I3 |- Y* E8 N2 X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# V- g& o, x& d$ Y% t% Y% ^+ z  set intersections roads with
2 n  \- @( O! H2 ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* m6 R- K8 M2 o- _8 t  {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" l6 Z, M) d1 |6 D+ F
2 H% o& i6 [# a' {" o" O4 H5 w% o
  ask roads [ set pcolor white ]7 _7 ~& A3 y& Q5 L0 R5 v0 D' z, d
    setup-intersections; w* U0 R' Y& @" R( `  j; l
end5 ^8 Z5 L) T5 P2 L
其中定义道路的句子,如下所示,是什么意思啊?7 ~: R5 m/ k* c/ y+ ]
set roads patches with+ D0 h0 z3 Z  W+ p0 F& T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 l+ A! M; G. @1 Q  p; |
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; ?; O: [5 f: J( v5 R' k) 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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