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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。
  X0 T1 `. z! e. V1 tnetlogo自带的social science--traffic grid这一例子当中,
7 T( [  Z4 l/ C, S$ k7 w/ Q9 C3 qglobals' O( k4 s+ Z4 Q! F% U5 U
[
) D/ H) e8 w2 [! \  {, }$ ?9 w+ i; i. Q  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 P$ H& o, g1 g: G( x( l
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
5 ?+ F, v! u. ?; s: O8 c/ Q  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
6 U6 H; h' T/ }: R& M$ [0 J  l                           ;; it is to accelerate or decelerate6 \9 @$ W0 i' z: f9 C/ m+ D  \
  phase                    ;; keeps track of the phase8 U! w0 e( x' _/ O1 o! w4 F
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  `6 K1 y1 Q2 a& _
  current-light            ;; the currently selected light$ H" Y. v3 Y: J. L7 O0 K# G

7 q+ S$ ~! T, G0 H/ E. ~  ;; patch agentsets
2 |3 E1 ?& }) X6 ]  intersections ;; agentset containing the patches that are intersections: C" a3 `- S$ h4 l! M5 L8 f  o+ i
  roads         ;; agentset containing the patches that are roads
; j- O6 X+ H. H3 T% {]
& i* J( Y. h) A- ]& }2 i1 f9 Y- [. W/ F, ~* R/ w2 t4 ?% z
turtles-own' G' P  @) Z; P5 J* f) z
[( W7 L+ |5 _' v
  speed     ;; the speed of the turtle
4 q) r9 F0 u* ^' y; ], m' `  up-car?   ;; true if the turtle moves downwards and false if it moves to the right2 g8 D5 D4 e1 l% |! o( J
  wait-time ;; the amount of time since the last time a turtle has moved
2 S5 t# F6 x$ w* h]. Z. x' M3 e% {* ~( c5 X

) H: @8 l( m8 G! }0 a: |7 r  epatches-own9 ?2 t( j" l  H7 {
[2 ^* F2 L: ]3 W9 H% |6 g- d/ {+ o
  intersection?   ;; true if the patch is at the intersection of two roads
- {/ K/ ]$ ]" N6 o/ l  \8 P7 k  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.5 |! w6 F8 u, Z4 r' g# A
                  ;; false for a non-intersection patches.
+ S: [6 r6 Z. @. X7 i0 r  my-row          ;; the row of the intersection counting from the upper left corner of the6 P" O( U& l/ H
                  ;; world.  -1 for non-intersection patches.
- H5 y5 u8 c% n7 B  my-column       ;; the column of the intersection counting from the upper left corner of the
) R0 q/ C5 E+ F                  ;; world.  -1 for non-intersection patches.
% o' k1 r% V# b) {# F3 ?  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.: p8 |  y! J3 d' j
  auto?           ;; whether or not this intersection will switch automatically.
) l/ O% a9 B% A1 N1 X" H: @1 d                  ;; false for non-intersection patches., g# N2 H$ {5 f- b# Z4 ^; U
]
# F) Z2 a. M: D, O7 z
4 T2 \( N5 ^# L- C2 D% ^4 [+ q+ e" E: C* Q# I8 n
;;;;;;;;;;;;;;;;;;;;;;
4 A. s: J- k6 X% s; Y! E* ^4 Q;; Setup Procedures ;;
5 O, m* R  A3 H; p2 ~;;;;;;;;;;;;;;;;;;;;;;3 ^& ^4 N" |% ]  O5 k. C9 R8 s

  a5 o6 R* O, x4 U+ t4 E* o6 I3 J;; Initialize the display by giving the global and patch variables initial values.% ]4 J0 w7 D& y$ J
;; Create num-cars of turtles if there are enough road patches for one turtle to9 G( {. i6 q/ B, n. K8 [: ^
;; be created per road patch. Set up the plots.
3 u/ F, @' e; \: x8 jto setup
. s* @2 O) c% H- x# O; `( t  ca: {1 b+ [. s# P6 x7 z4 V, l& \$ p* x
  setup-globals
* i* j1 T0 A+ _5 \- @3 Y0 z; p# Z% n1 g  l& P
  ;; First we ask the patches to draw themselves and set up a few variables3 E! {1 h$ f. k  j0 i5 }
  setup-patches
6 Z, I( P9 Y4 `) G2 O$ z  make-current one-of intersections
/ i) v% @. i! {- C  label-current
! }* i* o! y1 J6 |) |: `" P' a: w( S9 x# ?
  set-default-shape turtles "car"
+ B& q3 e3 K* F8 s# ^; @' q/ J* a0 R
+ J' Z( L$ ?% z1 V9 m& R  if (num-cars > count roads)
" M7 L4 ]- r; `3 e! E  h  [% W4 F+ Q/ L9 v9 y% d7 v
    user-message (word "There are too many cars for the amount of "
' G! u* L% T; Y+ x  v' B" p                       "road.  Either increase the amount of roads ", i6 s' ~7 l# L! E! u
                       "by increasing the GRID-SIZE-X or "
4 q# {$ Y- e8 {5 G6 m                       "GRID-SIZE-Y sliders, or decrease the "
" D" f1 v0 V3 X6 ^2 V                       "number of cars by lowering the NUMBER slider.\n"
% m' }/ [7 S8 k7 l% `6 V                       "The setup has stopped.")8 P1 B. ?4 ]1 n9 T
    stop2 w% N* _: E$ {& p, n
  ]
5 ~- v: S1 u- c: N
+ @6 g) W* T9 ^  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
  E4 r5 a' k, i9 ]+ F  crt num-cars5 n$ ]8 n# ~" a9 h+ ]2 V5 h6 j. w
  [
. v" I6 u' E  C7 E4 L( W' y" C    setup-cars
0 `7 u( ~: e" C  E8 h    set-car-color
% a5 X3 W+ P- I3 O    record-data5 o1 B) i/ c9 f/ V
  ]
$ r5 P/ c6 \0 t) g# U
) q% o. M' G! `7 A, ~" ]4 \1 @, a# d; E9 T  ;; give the turtles an initial speed
5 z8 T. ]: K, R9 Y: [* g6 \  ask turtles [ set-car-speed ]4 E% z) L7 A1 m; Y9 \
1 c9 N9 z, ?" L
  reset-ticks* [/ {' y& w$ e+ ~. E& H3 v
end
" @8 {: O& Y8 w+ p1 @- L% ?- [; H
1 `! i0 a0 _* F  D% F  ^, X;; Initialize the global variables to appropriate values# F% Y8 o& E! K3 E1 \4 M% Q8 {
to setup-globals# O0 j' s* @+ a/ e  K% [
  set current-light nobody ;; just for now, since there are no lights yet
  f, `; f# j: l# b; N) i  set phase 0* A+ q9 b6 b9 N7 v* K
  set num-cars-stopped 0
; w" i. [! {$ p/ u" s  `! ~  set grid-x-inc world-width / grid-size-x% z6 ~7 @4 V( M
  set grid-y-inc world-height / grid-size-y- a6 ~' y) ~) _5 d+ G" `

! A) `8 a0 z1 z9 T5 z/ V) c% x( ^  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 L8 F# U( }+ ~  set acceleration 0.099
+ x) t7 c; b( O2 a% {2 g9 i( Pend
9 H: J8 M4 ^& v+ x2 B+ o
: \: u- _# D1 B; I4 f$ X) X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
  D1 A7 J. o4 B; U  P# C8 E& g;; and initialize the traffic lights to one setting
4 P) V; z) p8 @& X1 Eto setup-patches  X/ ]: Z  J+ y4 a" k
  ;; initialize the patch-owned variables and color the patches to a base-color- r) m5 |/ ~. L! W5 l
  ask patches
6 t9 h- }$ y( W. ^! u  [
( r; Y4 [8 O4 I& p7 Z    set intersection? false
" A2 t6 t. C8 n3 z    set auto? false! U; o, i, D7 f. ~1 }
    set green-light-up? true
" b, _; B6 Q( B" \; N" N& `    set my-row -15 o) E/ g6 h' d3 T# ~
    set my-column -1) o' W/ S$ P0 D
    set my-phase -12 M! n, i: V/ e  W* A0 i& @
    set pcolor brown + 3* d: j' g7 j+ m) B( ]2 b- V0 a1 f8 M6 m
  ]( P6 m% m5 ~2 Q

- M; }0 }9 ^: c' e! Q) Z8 @& ^  ;; initialize the global variables that hold patch agentsets
; m- @+ F: d/ x* x  set roads patches with
7 _  U7 ?8 O; v, J' f/ O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 U! y  O) ~3 X& R+ L8 {8 T9 v
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; X) v0 F. y2 \0 Q& t, e; b) ?7 A& r
  set intersections roads with* y) j% S" y; _( e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- o. O( h- r6 t' T' d* {# I; ^    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. ^# y" F& R( b/ y& ?
4 F  c; g0 v0 i( I* v( x
  ask roads [ set pcolor white ]
" l1 ?% w6 {) |    setup-intersections/ T7 q( w3 B2 d& ~+ t, j! V* N
end
/ Z6 a* N  W# C+ R- f) t其中定义道路的句子,如下所示,是什么意思啊?
+ b* ]8 ^" W1 X0 ?1 M set roads patches with. b- U4 W: _) n. g: j- \' N/ `: \- W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& `$ S* k$ W( l4 d. a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' Y* _/ i+ \. D! Z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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