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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。
. X$ S8 F3 L( Xnetlogo自带的social science--traffic grid这一例子当中,, h3 i% c0 I% ^  k2 N- v
globals: t: W. z- f9 q# f3 X  F# {- y6 t5 R
[" J3 H5 Y9 z+ W. U
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 M- E: u$ |7 Q  `0 q( c% H  grid-y-inc               ;; the amount of patches in between two roads in the y direction& `3 O) M8 L. O6 T- J
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
$ d& m2 V4 P2 S' E/ J3 ?+ G                           ;; it is to accelerate or decelerate
- U3 \7 A1 \4 G6 B% x, V  phase                    ;; keeps track of the phase
' p7 s% E, s4 C: u  P! `  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, a8 q$ l, L* ~! e* _4 P  current-light            ;; the currently selected light
# ^3 ^/ K6 I' @( z
/ H& C1 `6 y+ G, N9 R  ;; patch agentsets
: d( R: V9 G4 R( u! l3 N& u5 K, S  intersections ;; agentset containing the patches that are intersections
$ Z  f, h- r, O: a  roads         ;; agentset containing the patches that are roads! \( B/ N' T  T  M! s6 R
]4 ]; X0 O5 A0 O3 m( C

0 [3 W- L: A# }turtles-own
! z- t* E2 q7 V: s9 o- g[7 V1 f. c$ m: }8 l* K9 H
  speed     ;; the speed of the turtle
$ d  d( B; A# z9 m+ t  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
, U+ ]/ O  |; Q0 J' k  wait-time ;; the amount of time since the last time a turtle has moved
' L, I6 }2 t* M0 m, E) |3 Z* p/ q]
) I  t' F) F! i; i+ ^, o. Q
% k+ }' r7 }6 _' e9 E, o( H2 Y7 Xpatches-own. @1 b% R# w+ t4 E4 w' P+ X. S( x; j
[( i+ F7 `. r, n; r! s
  intersection?   ;; true if the patch is at the intersection of two roads
- P2 W0 a$ e4 m4 D# c* |  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# k' m' q' P; h" d3 @
                  ;; false for a non-intersection patches.  x/ b7 Y7 m% a$ s% L" a9 C
  my-row          ;; the row of the intersection counting from the upper left corner of the
. r. f9 G2 l9 T% `/ |( ~                  ;; world.  -1 for non-intersection patches." x) y" _1 X- O/ X. d( Y
  my-column       ;; the column of the intersection counting from the upper left corner of the' B5 Q* e% v  g: y* |1 ^2 [
                  ;; world.  -1 for non-intersection patches.0 {3 R+ I; d% k2 v* Z5 t% E) q0 @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ F" w+ ^. i* r+ `
  auto?           ;; whether or not this intersection will switch automatically.; p- L% J/ @2 M* A
                  ;; false for non-intersection patches.* X6 r1 H9 @+ o# d, m, c% R
]
& r4 m, Y) U$ w$ a- J+ M
  @' v# O  G5 n9 A, E  r1 M
& U4 Q+ t/ q; k  ~, {3 P; j4 R0 m;;;;;;;;;;;;;;;;;;;;;;6 p9 J; l# i) L  y
;; Setup Procedures ;;% i8 H4 \% a& E& l1 X* ]+ C: _
;;;;;;;;;;;;;;;;;;;;;;( T9 M- Q' C0 n* Q
5 w: \0 [4 j7 c
;; Initialize the display by giving the global and patch variables initial values.
1 A8 d$ V. Q& h; X( M+ D) ~3 t;; Create num-cars of turtles if there are enough road patches for one turtle to
9 V# Q2 {- }1 Z, [;; be created per road patch. Set up the plots.
2 M( m3 _! K) k- nto setup
8 y$ L- V7 W& c9 `6 M8 u) W  ca  v# {6 y& X; C+ d: U
  setup-globals( N$ k$ y9 b. p0 N' N/ c6 o2 H4 ]3 h. I8 ~
/ i* L  D! i+ ~$ Q
  ;; First we ask the patches to draw themselves and set up a few variables
& M( v: G# p/ H! K4 |  setup-patches
4 T; G; @" [; G& ?/ T+ U  make-current one-of intersections( `) [/ b* h. K; T3 l
  label-current
( {8 \/ h; j5 K
/ r& R  n' Y1 K  set-default-shape turtles "car"/ k. y* K( P) b8 T& G4 c* l% e1 c
# y4 ?( J  b7 t; k' s
  if (num-cars > count roads)
+ j5 S2 Z7 e" ]7 d' x; g! \; L  [
$ t- L$ E4 J2 n1 u    user-message (word "There are too many cars for the amount of "6 c: o1 d8 Z  j' c1 I1 f( S8 D
                       "road.  Either increase the amount of roads "
/ S  r& E3 _* {) ^6 R6 T: Y                       "by increasing the GRID-SIZE-X or "6 @- Q4 w- {( f( X
                       "GRID-SIZE-Y sliders, or decrease the "
1 o3 G/ Q# U8 N- E: x" X* P                       "number of cars by lowering the NUMBER slider.\n"& |% M! P4 g* \& W+ o  Z5 Q) W
                       "The setup has stopped.")
& R7 n5 `) D! R" [, }" n  W    stop1 o4 S( X7 |8 M  v. ^
  ]# F( i& W, X1 j7 ^" X: P$ x# p
4 J9 Y' B6 K: ?
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ ~, t9 b; k3 O/ q  crt num-cars
8 d* ?$ G. q& i& ]# a0 v  [& z+ A- q1 ?! m. {
    setup-cars
! O* x" U2 |$ s& `+ U3 a% }6 K0 E( L" j* r    set-car-color
  {2 s* g) A1 n5 `3 T$ h4 [& l  Z    record-data8 w* a, d* [( C" J
  ]: {2 O* M5 L/ `! P& T2 X, r

3 }' S7 L8 A& G3 }; o( r  ;; give the turtles an initial speed4 C# w2 m& s* T- u/ o: j$ z8 Q
  ask turtles [ set-car-speed ]  a/ v' r. m% V$ M

! ]7 ?( A- l0 K, P; ?  reset-ticks9 P# L  {" o) F; x; W! a# l0 i
end
5 b. }8 m* }; i1 |$ C2 i5 Q- t* U" K0 p9 L7 X) }8 D
;; Initialize the global variables to appropriate values8 Y! v. H* W  C" q. l
to setup-globals% I5 j( X0 @# n* Q
  set current-light nobody ;; just for now, since there are no lights yet
4 J, _% b7 W% G$ h, z* i8 |  set phase 0& G: N! V' u# G  M1 ^
  set num-cars-stopped 0
' B+ n9 I. W5 H  set grid-x-inc world-width / grid-size-x
% q& V" g3 {' I7 q  set grid-y-inc world-height / grid-size-y5 \5 `, @8 x" t. b( d  U+ o

# A- c" }7 A4 F+ C/ J  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! x6 `3 x+ B( Q# i- W8 H8 z2 H5 [
  set acceleration 0.099
& Q# z+ [% l4 \end) g$ O" p3 p9 Q  g  `0 f0 Q
* H* u0 N0 H8 A+ X5 F
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, {* l8 s2 Z% }: Z& m
;; and initialize the traffic lights to one setting
+ q7 g2 i; {- ?9 a8 mto setup-patches
& o: i, b! r: S" e' q" u4 g" ]  ;; initialize the patch-owned variables and color the patches to a base-color: }% y* u5 T: X" h
  ask patches" R* R- _$ f/ i. k! _
  [# {2 g5 j: }9 X. ^% v. U3 }
    set intersection? false- S" G' I/ ]; I) M
    set auto? false
) e+ A: }& q8 }0 B. F5 {    set green-light-up? true
6 {1 B- }& u# b% V+ t# Z    set my-row -1
) H- i7 ^1 `9 N8 W* i8 [7 P    set my-column -1
5 {! z& g/ K7 t, P: F/ ^    set my-phase -1
. j1 {* {' T) }, j& [    set pcolor brown + 3
) o9 q3 f  E& H5 B  ]  U& L2 t2 c) X) L9 H4 B

8 T# k; n# K) Q1 I4 v3 [  ;; initialize the global variables that hold patch agentsets9 C" @: C7 O  t
  set roads patches with: X  u! S; j$ U5 Z: i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 a2 g3 f. E5 |7 _! V9 |3 A    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) u1 X# E" S- P, P( ~# H6 T  set intersections roads with2 ^! G2 l) ~+ Y3 x/ }
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 i. w) x/ }  A. K2 @; f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 ~2 z8 ?  v- n
  @" i1 G* K& b: V6 `0 D5 w
  ask roads [ set pcolor white ]
2 v# c8 Z" L; D. b4 z    setup-intersections0 a* T: V4 y1 a
end
+ i, O8 R: N; T/ c7 r4 \其中定义道路的句子,如下所示,是什么意思啊?* W3 G& t- {3 `! b; B
set roads patches with! Q- O9 V5 d8 o" l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ E/ e7 O, Y" z" F: Y7 S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- M$ O% s5 ~; ?8 {+ ?- L0 t3 x2 ~  n0 y2 l
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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