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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。% n" z" a3 I3 {3 c1 F" T6 d5 v
netlogo自带的social science--traffic grid这一例子当中,
6 _& U0 C. Y1 cglobals
1 C2 e8 f0 f' T3 ]# v* z  k3 o[
, Z3 E) B# S5 g# d" a* X  grid-x-inc               ;; the amount of patches in between two roads in the x direction" `. y2 ^) s1 {7 @  D  W3 Z! m
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
2 c' e9 [% C7 k* p, P+ q( r9 ~* v  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, W- a3 U0 u# U$ |- S
                           ;; it is to accelerate or decelerate
3 H, a; w& Z) E1 l. E% q% T  phase                    ;; keeps track of the phase- B# h; o8 T5 O6 F5 Y: E
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ f$ J/ U9 `6 B
  current-light            ;; the currently selected light
, t* g6 X$ n# t% I9 H: z/ U$ ~1 h3 ^: N% P6 S) [6 G
  ;; patch agentsets
. f# y  R/ J" h  intersections ;; agentset containing the patches that are intersections0 s2 }" _( _+ k1 l( r. r! H( ]3 P
  roads         ;; agentset containing the patches that are roads& o, |% y, L/ {
]
8 b  f! H2 H2 G; z' \( r  C
6 d1 [6 w1 D  ?3 J7 O5 L9 Dturtles-own* V6 i3 ^& h) q# h" Z
[. m8 H8 l& G( o* e6 N" z: a
  speed     ;; the speed of the turtle1 C8 k2 C1 D4 B5 q  \# ^
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' }$ S# W' {; @: I) E  {  wait-time ;; the amount of time since the last time a turtle has moved
1 k) ^0 C' j; B# \, k]
/ b( Z0 ], M  S. H9 y
* ~1 t, Q( h# }4 _4 hpatches-own
! A  y! i8 N6 n& O6 D[) H$ F: V. d1 z5 j5 E
  intersection?   ;; true if the patch is at the intersection of two roads* G& w) ]2 v! M$ K% q8 I2 N
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 x/ M: ~3 n1 \) {                  ;; false for a non-intersection patches." P  l2 P- @* W5 _
  my-row          ;; the row of the intersection counting from the upper left corner of the
* b0 q: `; D: T8 \4 Q6 ~3 @                  ;; world.  -1 for non-intersection patches.
: ], _% b% D7 d$ {9 u* x  my-column       ;; the column of the intersection counting from the upper left corner of the5 w* h& J7 v  Z7 T
                  ;; world.  -1 for non-intersection patches.
% w2 q$ H5 k$ I, O; J" r' P  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.& \0 y5 ?$ R8 U! C( t
  auto?           ;; whether or not this intersection will switch automatically./ x& J2 L1 _( y5 Z  |$ A- c
                  ;; false for non-intersection patches.# F" V9 R% ]8 }6 @* f( b% x7 C1 ^
]
) p& O8 n+ A; Y3 M& u  [4 M7 [; m( ]3 n" X& r# Q9 c
2 m/ T1 [- y+ K  v+ @
;;;;;;;;;;;;;;;;;;;;;;9 p+ W# X. [8 x1 M6 U8 O
;; Setup Procedures ;;2 j/ x/ C3 v+ x  o0 g3 `( W
;;;;;;;;;;;;;;;;;;;;;;
: O/ N/ f2 G: O% `' q  L/ \# z2 y' A3 a9 l0 i) A- w
;; Initialize the display by giving the global and patch variables initial values.- G. u8 G' N7 S' d6 i
;; Create num-cars of turtles if there are enough road patches for one turtle to5 j' A  K' b+ ?
;; be created per road patch. Set up the plots.
1 A5 @* [/ z8 N4 O$ eto setup
) u1 `& V& n3 f1 k- V6 H3 F$ s  ca  ^( _1 B& `/ k; n' Y$ V
  setup-globals
1 N2 H7 p" I3 G
  h+ @$ K; J2 v& Q6 p9 x  ;; First we ask the patches to draw themselves and set up a few variables9 O! T) j: [9 J7 K
  setup-patches
( X. j- T, Q$ N2 W) k  make-current one-of intersections' s  S7 r0 J. O2 A
  label-current& I& Q; J% H! B" c. \; ~6 T% h. F
. J) D6 p" h  h
  set-default-shape turtles "car"+ w' O, S6 Q1 a4 c

7 b) N3 G. ~. w7 j; x* z0 v) \3 e  if (num-cars > count roads)
* k) N7 {( x+ y0 C  [
# g! Y1 ~+ W4 m+ G0 |; F    user-message (word "There are too many cars for the amount of "; [" x" A0 H! X5 x5 r# a; C( d4 K
                       "road.  Either increase the amount of roads "' F) _$ A& U) m& ]
                       "by increasing the GRID-SIZE-X or "' e8 F" m  r3 k) C) P
                       "GRID-SIZE-Y sliders, or decrease the "
. p# Z+ N6 I3 r" z$ ]8 z% q+ s                       "number of cars by lowering the NUMBER slider.\n"
5 z3 f6 K5 A1 U6 ]                       "The setup has stopped.")
8 S5 m& O7 X8 H; F    stop  z* ^2 H4 G9 K! A# q* i; y* e! y% w
  ]
# Y6 D3 D' I- z$ C- P
8 V. u9 H6 r: Q3 d/ m  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( F4 t+ N. d! Z4 g* i1 v+ M
  crt num-cars
8 d9 f' n7 i; L+ y3 F  [
0 p6 k# {' F" T1 U' i+ M/ Y    setup-cars  [. T4 K# P' y7 {  E; n9 |
    set-car-color
! g; G: L- u$ q    record-data4 {7 Y  \/ {: L7 N4 n: E5 n
  ]( P& I* q" f+ ^3 J- _- Y

. s+ {8 }7 @! @+ S  d1 ^  ;; give the turtles an initial speed
5 b8 Z4 ~; Q0 l2 K' p! N  ask turtles [ set-car-speed ]  b3 s: Q5 Z& R
5 n3 e% o+ e- I: Z
  reset-ticks8 H  Q% V; R4 l9 r4 z+ H- ?
end) v9 n( ?2 ?; r

. i2 `# v, g2 ?0 }) u  z6 };; Initialize the global variables to appropriate values; F$ r1 Z2 M% C1 G1 E
to setup-globals
2 c9 r0 Q- z) x! L9 [  set current-light nobody ;; just for now, since there are no lights yet( L: h/ n! {9 B$ _4 N8 q
  set phase 0: w$ Z" J# J. G( }/ t. n
  set num-cars-stopped 0
& `" P# v$ o6 ]& W. c& J  set grid-x-inc world-width / grid-size-x
! o8 [; n8 s( J) E( u, `  set grid-y-inc world-height / grid-size-y
/ O9 r. W* f2 G; u$ @/ W& Y# d7 i
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 t& ]# s, H, x1 {6 c
  set acceleration 0.099
$ m; O, g# u5 B/ K3 ]5 [7 Vend8 d9 S. X9 |: P
3 H1 }- l0 u, L( r; t+ O
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 u8 ^: V7 c0 O+ `1 p% V;; and initialize the traffic lights to one setting- S' F; R5 p* {" N) Z& T
to setup-patches
" }1 G0 J+ Z+ n) b+ K7 l7 J' {9 G  ;; initialize the patch-owned variables and color the patches to a base-color* Z' [; V; ?9 H  [4 x# ?% I
  ask patches9 Q6 A: M, E( x$ o' \1 b5 o
  [+ w7 D  ]" R4 q; b/ a6 q5 a
    set intersection? false6 e7 w4 g. ~) {. ^5 R
    set auto? false
7 t% B3 X' R. c5 J; k    set green-light-up? true
( T  G3 [' A; O7 H    set my-row -1  q: s& V+ d3 |8 [
    set my-column -1
$ |6 {0 o# E: k6 P    set my-phase -1
# X7 s1 X5 A0 L8 z    set pcolor brown + 3
9 a* n! ?1 N# @* R3 U  ]
7 |- m$ X" G) ~) A. r& x4 x; S* S& k1 v  }4 b5 e
  ;; initialize the global variables that hold patch agentsets% q1 \( O+ d6 z6 x4 P
  set roads patches with
5 G7 @) K2 I1 M9 q+ B4 X+ I    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, L6 `5 \2 O/ @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; Q+ e3 ?# [$ L
  set intersections roads with
$ a1 n) k! D! h9 V) Z, O) k    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# h  E& x3 y. Z4 ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], x1 e5 S4 S3 A- o0 A+ n5 c

' Q+ o7 E+ {5 s( F  ask roads [ set pcolor white ]
/ Z6 V& e+ t$ z9 g) O! \) W    setup-intersections
" h, w5 d* B7 `7 B0 y* Aend
: E$ p" ^! \6 S  d' z3 G其中定义道路的句子,如下所示,是什么意思啊?+ ~" P' y8 G. j5 c# z
set roads patches with
) t! b8 T/ L% q. V. J8 o/ S5 c( ~    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 o" U1 S# V6 e! ]% ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% e0 ^/ ~# ]( P9 _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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