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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。# z$ M- K$ N  f& V2 [
netlogo自带的social science--traffic grid这一例子当中,% h0 [  J* i" V$ b
globals% s/ S- A( m& o( w9 Y
[
5 {! D) f. J/ n4 O! q  grid-x-inc               ;; the amount of patches in between two roads in the x direction. v1 @8 h' R7 _: m1 a! k
  grid-y-inc               ;; the amount of patches in between two roads in the y direction& L+ u5 `0 ~. w. i6 i: O
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if+ x- ~$ l" `0 j6 f
                           ;; it is to accelerate or decelerate
4 c7 i0 \/ P' d  phase                    ;; keeps track of the phase
# [& W) e9 {0 w3 w  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 ~0 n; B0 i" m1 o  S) ~' ~0 j6 c( G
  current-light            ;; the currently selected light0 {* t8 n1 A4 G& c5 `8 y8 Z
  \7 [3 m0 l  H4 I: S
  ;; patch agentsets
( m5 X4 V- ^5 {* ~3 G9 z( {/ F! V  intersections ;; agentset containing the patches that are intersections
! w, F: c7 W. Q  roads         ;; agentset containing the patches that are roads+ G5 ^. F6 b- d5 L. m
]
0 s* H! S! ?4 V0 E) `4 a+ k: D, C- D2 z. ]# s
turtles-own
* k. p8 j( {/ o. D9 s0 B* x[
  S# U" L" J  x) ?3 Q( D- k" _" e  speed     ;; the speed of the turtle8 v0 N8 K, {& V/ c; I0 z
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right0 s; r. J& ~3 o5 a' K6 [- ?) p
  wait-time ;; the amount of time since the last time a turtle has moved" I7 z% J! g' B8 H, S  y: M6 k0 Q
]
9 V5 b4 t( z. e! j
3 `  ]- f: Y; N# ]patches-own
6 i  Z1 t1 c( o6 X/ O% ^[8 ~: o* P2 ]# w3 F% N4 I* r
  intersection?   ;; true if the patch is at the intersection of two roads
1 y* G  W' \7 B5 h  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." f) v( S1 t$ B2 u, x- F5 B8 ^
                  ;; false for a non-intersection patches.
" \& `/ @4 ~' L+ t$ f  my-row          ;; the row of the intersection counting from the upper left corner of the4 c  l4 h$ B5 S
                  ;; world.  -1 for non-intersection patches.9 R9 h( D: V, o! w6 Q6 g
  my-column       ;; the column of the intersection counting from the upper left corner of the
2 \% b$ Y1 _( u3 u% M" l( F0 w                  ;; world.  -1 for non-intersection patches.
. d% I8 a- ^' v! h; D! J( B6 H+ P  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
" S7 A2 x" ^4 g% g" ]  auto?           ;; whether or not this intersection will switch automatically.
" [9 i& o: A8 k8 k- @: C2 P* I$ i                  ;; false for non-intersection patches.$ A3 _: U0 K+ {) U2 O6 S
]" ]6 n& f( f% x8 G% P
4 w) }  H+ t) Z" r; S6 J
9 ~2 ^, Y, F) g0 V, C$ s
;;;;;;;;;;;;;;;;;;;;;;7 F$ b- @- Z1 ]/ V" ~0 m! B/ `
;; Setup Procedures ;;# h0 L& v' O0 F. v6 Y; E/ {
;;;;;;;;;;;;;;;;;;;;;;" @* R' e. ?, T" a# t
/ B1 J' y# o% T% U
;; Initialize the display by giving the global and patch variables initial values.
$ Q) v. y4 T1 g2 o7 Q;; Create num-cars of turtles if there are enough road patches for one turtle to$ n1 ?  S% t+ f- `: E9 e* L& Q
;; be created per road patch. Set up the plots.
' X2 P* a: R* Y3 T: K+ ?to setup
) h: }9 [; ?( h  ca! z6 O9 i$ Z) P) h% o" G9 G" |
  setup-globals4 n# k3 L$ F6 q
" E. T* {, B+ a6 O. a' C* X1 w
  ;; First we ask the patches to draw themselves and set up a few variables* n0 w# U' G4 J1 E5 U6 z4 R5 ^/ z
  setup-patches
% A+ M% P$ s5 s# ~  make-current one-of intersections
* k& c& I+ {3 _5 I% G% k  label-current: U. L- c; U: B) q) w1 L
; k: H1 ~& ^8 W5 L! x2 N
  set-default-shape turtles "car"
5 [8 w2 D9 B( G5 V+ k& ?1 x
7 h5 o3 j8 D, l7 z! Y5 r- a  if (num-cars > count roads)
1 k3 g2 G+ @. B- j  [+ c: L+ L3 [* n' q, L
    user-message (word "There are too many cars for the amount of "
- \; r$ d! {& |* U: o( ?                       "road.  Either increase the amount of roads "; p& _6 ]" M; B1 S
                       "by increasing the GRID-SIZE-X or ") K! {* ]7 D% m, D( T* W) Y" U; A
                       "GRID-SIZE-Y sliders, or decrease the "7 Q3 E/ E: f7 c6 \5 |+ n( e+ {
                       "number of cars by lowering the NUMBER slider.\n"
3 a6 D. f4 I5 z3 R" G                       "The setup has stopped.")
5 f% l- u$ P6 _    stop
0 X/ |/ d( {0 k  ]
! u( w' T: e' `$ e5 L- v1 H  Q. l$ H, ^# W2 Y- y1 _% b
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- H% u- X8 h3 {$ o4 ^% {& ^+ O+ Z  crt num-cars
6 T, T7 E8 n' p& @# d7 u  [1 R# w! t! T: b% y: K  W
    setup-cars
6 ^+ e9 B3 z7 y! [8 c, ]    set-car-color4 X+ T: f3 B! z( |8 F
    record-data
. R+ Z! S) r! H2 Z4 M% t7 R2 ]  ]) b0 p# Q! z$ b
% c7 `1 K4 g0 g% \
  ;; give the turtles an initial speed3 H6 _, t, T9 L- o2 t, M5 Y
  ask turtles [ set-car-speed ]
0 p0 M& M  ~& M) u7 ?& R2 k- i  D  X+ n9 [2 s4 L  B
  reset-ticks$ m! B' T4 Z+ e  |/ j5 @8 J) t
end/ E0 u4 |& U5 Y0 e5 s

# I; E0 H  I+ B* V;; Initialize the global variables to appropriate values$ B$ ?- |& p  |) V1 x
to setup-globals
0 X. d9 ~+ H- \% b. s  set current-light nobody ;; just for now, since there are no lights yet9 x% ~* z! V* b' l9 l- N( L
  set phase 0
4 M/ Y' O6 Q, l' D2 p) D9 G4 B5 ^  set num-cars-stopped 0
9 e1 ^/ r  @6 ]$ y4 l  set grid-x-inc world-width / grid-size-x
( p! d( A- S. [  set grid-y-inc world-height / grid-size-y
4 Q6 |, m4 ?3 o  ]. T9 w9 T8 R% P
7 Z6 G5 y$ h4 w. x5 Q3 W6 k5 k& W$ L  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. |4 P- {" }# ^  set acceleration 0.099( e( E' L& \0 S( _9 I) E
end
* y4 e# g3 h+ K8 N/ Y  r5 [7 v) z8 k4 b6 \: n  U. j
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: Q; U+ ^0 z, e! y" `
;; and initialize the traffic lights to one setting
* }# t: H% W; }+ F! Jto setup-patches
, ]: q+ T% T/ a1 q# v8 D5 j7 n  ;; initialize the patch-owned variables and color the patches to a base-color) n, B, `- E# m/ X7 T, J3 S; G6 H$ x
  ask patches
* H; r& J6 r, V  [4 N. b6 a. o0 \9 K. a0 q
    set intersection? false
# ?9 A1 L" c& V. h; c5 T    set auto? false9 B, W! E, r5 _9 ^
    set green-light-up? true
6 a! E( r! b6 F2 e    set my-row -17 P& H* e1 M; V/ }: n) \
    set my-column -1
9 Y9 x& o/ C6 ^8 ]/ m, ^* V    set my-phase -1& x" Q7 v( u  C& p
    set pcolor brown + 38 \/ l" m$ ~' F5 q6 L# y, d0 e
  ]& s) j3 o5 J* ?. t  \

( ~+ n/ ~* L" t# W9 Q  V+ e, s  ;; initialize the global variables that hold patch agentsets, r$ I+ n5 e" ?7 M" C
  set roads patches with
" x3 v5 \! I2 I    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( W6 L# j& z% Z  s; S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ y0 K# u! N2 _  set intersections roads with. C6 Y" J+ M* L* E+ m% u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 I& K8 `- W, {* b0 K7 z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ d8 F; G) N" B) r& J  `1 }0 c" e) Z- C' t. Z( R
  ask roads [ set pcolor white ]3 f2 x' l. S- ^/ l/ K
    setup-intersections
" Z3 i+ T2 m: u8 t+ H: U- Lend
3 ~8 w( M( {; y$ n- Z其中定义道路的句子,如下所示,是什么意思啊?+ Z/ H0 ~- @4 T# Q/ n
set roads patches with; D! ]2 U/ w* T- Z! e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: u4 F0 E$ X7 \2 R/ V2 T9 J8 X
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& O/ j+ L+ H8 [, O" u! d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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