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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。
3 f& d5 Q5 z5 h: ~8 f6 Rnetlogo自带的social science--traffic grid这一例子当中,
" r! J6 b& B& i( a) _globals+ z, W! B5 F* Y5 a
[
6 M. h# F) n3 `4 b: M) @) I( c  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ y1 t4 G! w& g# ~" G- C  grid-y-inc               ;; the amount of patches in between two roads in the y direction
% @: C7 w9 N% A* |  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; R" Y! l+ H7 p6 S( Y+ J                           ;; it is to accelerate or decelerate
6 @& I$ l. j5 `9 ^$ ~0 d! C" Y# T  phase                    ;; keeps track of the phase+ f) h1 ^/ q" V6 J6 H  d
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& {5 T) V' n$ }: T3 q
  current-light            ;; the currently selected light
* h4 H* T+ C5 k" s( q8 S
/ I5 z! F! [: k1 C6 T" ]4 C; j  ;; patch agentsets4 a# T' Q5 J) W; Y; w" ?
  intersections ;; agentset containing the patches that are intersections* y; h/ j2 v6 N
  roads         ;; agentset containing the patches that are roads4 c9 B2 u+ Z6 C9 h4 Q3 w; m
]
9 Q5 D  H1 I2 `; f; ?+ L
( H- x" q# x% E3 kturtles-own8 a# x/ E" A" M- z
[
# W. I8 I; X8 K9 w: W$ |+ r  speed     ;; the speed of the turtle  m0 ~5 H; P5 m8 ]$ a1 z' {0 e  w
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right2 P) M- D. X6 w
  wait-time ;; the amount of time since the last time a turtle has moved
4 }3 j+ D  b% J, @; x( s1 ?]- y; g$ ?0 [3 s( ?( @7 m0 \
+ z- Z% z' R" c- l$ D5 W/ e
patches-own! i! b) g/ A1 k! K9 _
[! {. X( @- l4 U/ u
  intersection?   ;; true if the patch is at the intersection of two roads  f7 N3 y( H8 c3 {* K
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% I1 P2 u& r4 L& J3 ?2 d2 N: F) h: X                  ;; false for a non-intersection patches.
( v4 A" E+ |6 e0 z+ B0 B  my-row          ;; the row of the intersection counting from the upper left corner of the8 P6 v& ]+ H. ~% F
                  ;; world.  -1 for non-intersection patches.
/ w0 J& @! V8 }4 W5 ~( ~  my-column       ;; the column of the intersection counting from the upper left corner of the, `- R" g; w* C  q& [# h
                  ;; world.  -1 for non-intersection patches.
, S& m* l# t# \  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.7 j* h; }6 j2 O+ V
  auto?           ;; whether or not this intersection will switch automatically.! f$ P- g0 z% q0 ]
                  ;; false for non-intersection patches.: p- K: V5 A7 \, g) l
], `+ k: ]- x/ H8 L4 M, G% F

3 S! E+ L5 t) P3 o
+ D9 D" J1 [9 }$ \. ~;;;;;;;;;;;;;;;;;;;;;;. ^- E9 r; D, K. O
;; Setup Procedures ;;
  v- l7 W: I; K. f/ K% B;;;;;;;;;;;;;;;;;;;;;;
& }2 f4 u: u" _6 l/ F* i1 @# c, V; G1 O' D7 U3 p
;; Initialize the display by giving the global and patch variables initial values.9 c$ t2 y6 H) E9 X
;; Create num-cars of turtles if there are enough road patches for one turtle to# a% I/ E: B% B2 O0 B' w! H& p
;; be created per road patch. Set up the plots.: K; i( g7 m. a& g. @" s% d
to setup4 g. E# G( k, ~8 j+ h- J$ U
  ca
/ T; D, B* F# I( z6 o  setup-globals9 g7 S4 H% W9 t0 G1 a* o+ ~

7 r* c0 N" ?+ K8 D6 X- ^  ;; First we ask the patches to draw themselves and set up a few variables
# M5 ]) e5 U$ S1 a  setup-patches) c) o# c" X* e) x8 j% o2 x' f- g
  make-current one-of intersections7 {  m3 b" N  w7 \1 i
  label-current% ~* {$ D: k( ]" |, }; W

0 x" O, v. k  Z- k  set-default-shape turtles "car"
4 x+ `, G' P1 `2 ~2 b% S
& |% {" G% s8 N# B" f1 d  if (num-cars > count roads)
! j3 ^6 Y+ e, b3 }  W  [6 m" q9 x, A- O9 Z8 G. `7 }
    user-message (word "There are too many cars for the amount of ", c: n2 D; C8 a; o8 R$ x! R4 F8 J
                       "road.  Either increase the amount of roads "5 F6 Y4 ?! g# q! ~% T: ?! _4 v# Z* c
                       "by increasing the GRID-SIZE-X or "
2 Y) h$ n; a0 s6 o* @                       "GRID-SIZE-Y sliders, or decrease the "
# c5 O4 f. g3 E* i! V$ k+ h& R                       "number of cars by lowering the NUMBER slider.\n"' y5 x! {/ r: f  X5 c2 d: U
                       "The setup has stopped.")
2 I7 ?' v3 U2 W& f) U' Y    stop
" |3 ?; V4 ^6 v  ]
' R" b* f  t+ O/ H
- x  D  c, ~# n! Z, Y* A7 [$ S  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ P( J+ r# x' s2 l( P5 b! x  crt num-cars9 i. T5 g9 Q9 w
  [
# m5 Y+ s/ Y2 \. W+ K* j    setup-cars
, F2 X2 ?7 d" }/ M    set-car-color
! Z# b$ D; m9 R    record-data
0 u/ x: o# I5 o! T7 q7 Q, M  ]
6 x+ _( i9 u: T1 n' ^. J; v5 t2 E; _  T! W
  ;; give the turtles an initial speed
# d7 `7 U9 V: x  ask turtles [ set-car-speed ]- C/ ^9 T- Z* @! e3 o
& [9 i/ ]6 i( {. V+ S
  reset-ticks
: j9 k5 z! N2 B% X/ M9 j" Kend
/ h1 A" U8 o6 n) R+ ]. W8 w
9 S  T. ]" g: ]5 i, e;; Initialize the global variables to appropriate values
% s3 g; `# r8 _( Pto setup-globals
# W1 d+ Y) g  v7 M  set current-light nobody ;; just for now, since there are no lights yet2 ~' o" j" m; r
  set phase 01 g# T1 {! |) f+ T) d+ }/ p
  set num-cars-stopped 0
% d1 j* u) c1 e$ t  set grid-x-inc world-width / grid-size-x6 A2 ?: [3 R% G$ b
  set grid-y-inc world-height / grid-size-y
  B5 @. k' }; C5 P% K( U
' G2 S# ]5 l6 O0 q' D8 Y% S. U  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 Q6 R- D" F# `% R0 k
  set acceleration 0.0990 X) G" ~8 b3 }  j' h
end5 B. J5 z- l9 P, ?; J% s

4 ^  D3 m; C" \8 O5 l% N;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ g1 B9 ?6 O- s0 B) n, @/ V0 n;; and initialize the traffic lights to one setting
1 k& l) z! }# h. F. Qto setup-patches0 \# _# E: Q  w9 a
  ;; initialize the patch-owned variables and color the patches to a base-color
5 Z9 A7 U* `& m/ F% x  ask patches- j7 g. e5 }( [
  [: M2 x* k+ f/ l& k/ C3 N& S
    set intersection? false2 U) \0 _; ~4 z! @+ I
    set auto? false8 w( J3 L2 ^& ~( a
    set green-light-up? true
3 z. i' ]& g" G1 X7 k( b5 ]3 E% q    set my-row -1
  _% T5 R, T. K$ b1 m    set my-column -1
# i5 |7 _9 A" Q( @6 {  r/ i    set my-phase -1
( e$ B* p# _7 |! A8 x    set pcolor brown + 3
6 ]4 ], K' E' c+ c5 e5 T  ]7 D9 ^# Y2 D9 m9 y7 ]0 o) W
- H% G5 m* A8 Y" L7 p2 D
  ;; initialize the global variables that hold patch agentsets
9 H  e7 _& ^9 `( \6 y3 S  set roads patches with
) {. ?# ]; [# A7 e" _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  j6 n# {9 r( M$ o
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( f1 @* }* F# x# [  set intersections roads with( h* z+ A9 s/ C: J
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& B! H$ J' r* p+ j4 m, L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' T9 U) Q( i* Z0 g4 S
9 W8 {+ o, b. K7 a+ H- J
  ask roads [ set pcolor white ]
& t! ^$ h4 B$ O( A    setup-intersections
3 l$ E4 h: g2 Uend. i% Z7 p  Q! |7 T7 ~. [
其中定义道路的句子,如下所示,是什么意思啊?1 ]" L3 r) i$ S6 l2 o1 L5 b. n
set roads patches with
. O' Z6 N1 P1 k! n$ z% h% C    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 Q. y5 L( l6 Y" Z1 u1 N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ o5 A7 ~1 ^7 }( M# z) 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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