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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。
9 x0 N3 X: Y' t9 Dnetlogo自带的social science--traffic grid这一例子当中,
9 }) A# N! Y4 v# n3 G0 vglobals
9 _* F; L( q' G' x! k" D[
* c) Q; D" K5 t7 P/ I/ u7 ~3 m2 e  grid-x-inc               ;; the amount of patches in between two roads in the x direction/ M; V. H$ f" J2 J0 {# g
  grid-y-inc               ;; the amount of patches in between two roads in the y direction, c8 b4 g4 m/ ~' g3 d
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if/ y+ j5 z& t0 H' ^% @' G) q1 |
                           ;; it is to accelerate or decelerate
: \  H) b0 i9 Y  phase                    ;; keeps track of the phase  ?3 w- D" V% {2 a% W9 Q% J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure5 d" Q' ^  i4 v6 h
  current-light            ;; the currently selected light
6 H' i/ H+ h" e  z7 `2 j0 B8 _: Z% Y: P6 _
  ;; patch agentsets2 s, M  r  G9 p6 y8 M; w
  intersections ;; agentset containing the patches that are intersections
1 C9 @; s- l+ v  roads         ;; agentset containing the patches that are roads
! U9 j3 E- A, K: z: `; ]" w]
9 U" J8 c( }; H  l3 ?/ ~
! ]  B4 o: }% o) m/ u4 Z9 `# mturtles-own6 t& d( h" h# {. h
[& A4 M3 I0 o& {* F4 }6 V, J
  speed     ;; the speed of the turtle
1 j+ {+ M9 J6 z3 r% V  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
/ D7 w) q/ i5 @) J/ _  wait-time ;; the amount of time since the last time a turtle has moved
  i6 ^: F) W% N7 u5 x0 T& R]
7 r& y, d3 `$ l+ {& L9 Y* e$ d% h. R$ G; B, D
patches-own
. ~5 n7 n& u/ Z2 t" w4 {[
, j3 ]8 v# ]6 |2 B  intersection?   ;; true if the patch is at the intersection of two roads) X( ?% v" g$ m& P, C7 A2 B
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.4 j9 K9 G- f3 G
                  ;; false for a non-intersection patches.2 K; ^! t3 v% U/ [
  my-row          ;; the row of the intersection counting from the upper left corner of the
, m' r" u* U# W0 T                  ;; world.  -1 for non-intersection patches.
5 Y/ ~7 Q; w+ Q+ r, C  my-column       ;; the column of the intersection counting from the upper left corner of the- ?+ |& O6 r( \! C" ]
                  ;; world.  -1 for non-intersection patches.
9 ~. W/ h9 g5 z) }/ ^& b  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.0 x* H- A/ q4 d4 p
  auto?           ;; whether or not this intersection will switch automatically.
( G8 R. t) x/ ]                  ;; false for non-intersection patches.
& T6 M: c" A6 B]
6 L( B' ]% E/ i! m& @# b2 H0 P* O. o2 S$ B
' h) ?+ p% H: I% }+ v$ [+ P
;;;;;;;;;;;;;;;;;;;;;;
7 s& G' _2 ?' e5 w* C2 C;; Setup Procedures ;;
; g* v+ w* M8 G: _2 R$ q$ r;;;;;;;;;;;;;;;;;;;;;;
9 K- c( k( V2 j2 l' {! `# Q9 z! p& r7 q$ R6 Z
;; Initialize the display by giving the global and patch variables initial values.
2 \; m/ a9 N; N7 T; W+ H;; Create num-cars of turtles if there are enough road patches for one turtle to0 X: _' w3 Z3 z. a: {
;; be created per road patch. Set up the plots.
$ h8 ^7 U3 M* Ato setup
# k+ {5 ~4 G6 d# Q# u) X) s' Y1 x! \  ca$ U) q) Z7 V! N: w' M! C0 O" ?; U1 k
  setup-globals5 ~2 ~3 p3 ^8 A2 Q

5 e0 X) K5 D6 h/ Z  ;; First we ask the patches to draw themselves and set up a few variables6 H: f* B! K( L4 O
  setup-patches3 X  L" _* j; o, m
  make-current one-of intersections
9 V. L8 g6 |1 ]9 u7 H! m  label-current
( E9 f0 y/ v5 Q1 ?/ p/ n' q. b
1 \1 }) V. ^. r# E7 L  set-default-shape turtles "car"& U# E; L( {1 H: T

& M. T7 ^* q0 G6 ^1 H+ a  if (num-cars > count roads)
, Q% S8 a; Y: y( k. y3 N  [
6 c- O. a) ^$ M9 ^( ]0 y    user-message (word "There are too many cars for the amount of "
: l- K2 o7 t1 {% L. O  K                       "road.  Either increase the amount of roads "
0 H; Z( n# d+ K; Z9 H7 }                       "by increasing the GRID-SIZE-X or "5 T! E/ [( m/ f7 Y: S' d
                       "GRID-SIZE-Y sliders, or decrease the "
/ Q8 z$ Z6 a: v& H                       "number of cars by lowering the NUMBER slider.\n"
, Z- Y3 T7 v% X% i' d) T, {; `                       "The setup has stopped."). K4 u6 s8 b% i; x" @& Q/ o5 D
    stop/ K1 |- d3 ^3 G
  ]. s8 F  q: E" e2 D- z1 G% P9 r
& |: z, T% d$ s6 T% S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 h3 Q- \  t3 _. L. K
  crt num-cars
. o0 Q- O) y2 U  [3 E/ `; q% T/ a% y( n& B) v- h
    setup-cars7 F. N& ~( Y( }8 Q
    set-car-color
$ ?& U# i# @7 O0 Y6 Y: l    record-data
. y8 t3 F( F" R$ ^  c  ]
" S# X7 m1 d! \. K3 T
! B( d% c6 N" a  ;; give the turtles an initial speed- b( b; k- Q: @, R# P3 F8 }) N3 W8 H
  ask turtles [ set-car-speed ]
/ u4 S1 k1 n; n- m2 q& @% l" [8 e" C, U: F+ z. N8 {1 _
  reset-ticks
+ ]' p: a( g! j' s4 K8 I# Cend) |% f7 e7 V/ B' e! A7 C, D
; U0 n, X! V9 c. f
;; Initialize the global variables to appropriate values* [! q. \& Q  s) v. L) c7 M8 {- O
to setup-globals& E/ C# q6 h% F; X2 k9 S* x  W
  set current-light nobody ;; just for now, since there are no lights yet+ b& ?, O' F" _8 M
  set phase 0* Z" f# x2 k3 K: O( T, D
  set num-cars-stopped 0
7 w0 _: k0 N! ^  \4 G  set grid-x-inc world-width / grid-size-x7 k6 e* n3 D4 Z% J+ p/ H2 }6 ~
  set grid-y-inc world-height / grid-size-y
6 H% r( p( U$ B/ |  E
) A# b+ C. B6 _) f  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 N' e& b, v$ k) w; e0 `9 C* x
  set acceleration 0.099
) S+ R. z" m7 e0 K# }end- z2 F- S, w# r* n  C

& a8 s* T# u6 u2 h' u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- |2 b! D: U( H; q7 u0 s. z7 v;; and initialize the traffic lights to one setting
0 ?2 w; n1 R% H/ b9 k3 x0 }' ]+ eto setup-patches8 Y3 R7 x  r) G- n
  ;; initialize the patch-owned variables and color the patches to a base-color
9 M" ]' v7 \) ^/ i% Y; J  ^. z  ask patches
% G1 D, F9 M- H  [
2 ]5 O) w& J9 `' {) Z4 |4 |    set intersection? false; t6 ^: z9 z0 t* u7 f
    set auto? false
5 v  f+ t- L, i6 O$ I. h3 X" {    set green-light-up? true/ [* P7 O* n8 F! d7 l
    set my-row -1
& q- b5 g1 Z4 w9 R6 w    set my-column -1
7 `/ H$ W3 d# {- L( i; @. u    set my-phase -1
3 i0 Y1 e( ]8 n$ V: O" D& B. \    set pcolor brown + 3
' j3 Y- F) y7 w" k  ]1 j4 ?) v& Z! M$ H: b  D8 E! a9 q

- M  D& X( e/ Y+ v* G; ?& X' G  ;; initialize the global variables that hold patch agentsets
. _$ _% b* y- F1 n9 k4 j  set roads patches with
3 l9 z9 g( ]1 S9 v: k& g- j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% m0 J* n6 R3 A4 B8 L8 d! W. c
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% _4 `; ]5 o. V+ F& h. V" S; m7 ?% F
  set intersections roads with0 b" `% O+ j1 N4 T9 o5 P+ j9 G+ @' D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* z5 d8 Z, P2 ~    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 i! F( w/ s8 e% x; u, q
. ]! `% L! S' W0 O# [- e3 h  ask roads [ set pcolor white ]" n9 }! B3 d; {6 v( j9 _
    setup-intersections
* ]- @% o7 w# `% A  [, }, j7 t2 j% mend
. a, K  }, f- G8 Q其中定义道路的句子,如下所示,是什么意思啊?
3 G+ E0 D% H9 F  o5 Z, @4 ]2 ^; l set roads patches with3 s# N* e8 L  f9 F: l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) \& |' ?/ J0 O3 f
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 ~  d5 e7 G: W3 P' q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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