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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。
1 C) u; s/ a/ A4 y) x; |, hnetlogo自带的social science--traffic grid这一例子当中,
* w! E+ i3 _* |" L+ w( }7 G6 J4 `globals; P7 b% o0 O- @* y
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3 d& N( @' b/ t( f- } grid-x-inc ;; the amount of patches in between two roads in the x direction
2 u; `' y4 I, ?- A, `6 ]4 C grid-y-inc ;; the amount of patches in between two roads in the y direction. m( h5 e+ f* m/ x. B% r; ^0 |7 C
acceleration ;; the constant that controls how much a car speeds up or slows down by if( K- A0 U% v* L: l# Y/ F9 Q
;; it is to accelerate or decelerate
( m- J+ f6 ^9 U4 ] D; e- G* o: p! F# I phase ;; keeps track of the phase- d4 X. M1 `, q/ Z- U
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 y! x% a4 ^' T! M1 {6 y current-light ;; the currently selected light: e4 E- W' M) W7 h+ u. M/ K
: ~3 e; \* N8 X ;; patch agentsets
5 Y; V& [8 y3 e8 C D" { intersections ;; agentset containing the patches that are intersections5 _% H; T, H: d( e& s. ]
roads ;; agentset containing the patches that are roads M: z0 ~9 H) y6 R3 T0 B5 e: b0 p
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5 I; C: x4 y1 W+ P3 n. B. ?- e; D0 cturtles-own" {2 r0 {! D, j4 U2 P A2 v8 U
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speed ;; the speed of the turtle; ?) p! M0 S& C- i
up-car? ;; true if the turtle moves downwards and false if it moves to the right8 m/ ~( e, H3 p1 K. }) P% ^
wait-time ;; the amount of time since the last time a turtle has moved0 ]4 G# Z! c8 N& w& P X! @
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patches-own% I/ T- |1 q& o
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$ V$ A; _6 ~7 `$ _6 U3 m/ T intersection? ;; true if the patch is at the intersection of two roads
6 o- f" q( s8 A3 V. K4 e) T green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% K: f8 `& a) R; f- i* f) K ;; false for a non-intersection patches.
( W9 d% q: I+ [. D: B my-row ;; the row of the intersection counting from the upper left corner of the2 ` Z) V7 p. ]
;; world. -1 for non-intersection patches.
# j& g% ?7 I1 E7 F% u my-column ;; the column of the intersection counting from the upper left corner of the
" f' n/ w( q# o, Z" d0 v; X* X ;; world. -1 for non-intersection patches.9 J `6 G) ?" d8 _% \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) b; O% `: p- l, g
auto? ;; whether or not this intersection will switch automatically.
- O2 N& _* D* P& Z ;; false for non-intersection patches.
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' e+ b" k% u* m5 t3 n# S: V;;;;;;;;;;;;;;;;;;;;;;8 v3 ?# u- v8 x& F5 l, b& n3 Q4 k+ K( W$ M
;; Setup Procedures ;;
/ S* c4 w# ?) l& n;;;;;;;;;;;;;;;;;;;;;;9 V/ ?& P' X/ F' Q# I
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;; Initialize the display by giving the global and patch variables initial values.: y9 h* D# M3 d
;; Create num-cars of turtles if there are enough road patches for one turtle to7 w4 ^' x3 s3 h* D& c% q# Y$ s
;; be created per road patch. Set up the plots.1 J9 {& Z8 a+ g# A3 c
to setup
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setup-globals( Y% W. x# K9 g. J2 U; y
7 S3 P1 I5 C5 t" o' b2 P7 B2 z ;; First we ask the patches to draw themselves and set up a few variables# ?4 P/ B1 K0 \/ D' E* N3 o5 K# m
setup-patches. d( t; c3 P8 D, E
make-current one-of intersections; D) \* Z) K0 W& K. d
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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4 d' K' u! }" G' q1 {( I8 w user-message (word "There are too many cars for the amount of "
6 v# k4 a' ` Q3 b% F- }' f "road. Either increase the amount of roads "0 H+ \; L' k9 o3 N
"by increasing the GRID-SIZE-X or "
0 d: Y) P" n, D. m "GRID-SIZE-Y sliders, or decrease the "" b! g7 ~+ J& f# Q5 }( d
"number of cars by lowering the NUMBER slider.\n"
& m0 U6 a; n. U6 ]& P "The setup has stopped.")7 \, f: s; X( O* K; l2 S* g- M
stop
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1 i0 a Q1 R" ]! ] ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color. W9 e1 |. e$ E) W- R U; `
crt num-cars
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setup-cars
" F& n0 X. w" X" ~0 F5 Q/ L) O set-car-color
1 k& j8 w1 |5 R) [9 k9 J0 \2 X record-data" b# E4 `( @5 }/ k G
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;; give the turtles an initial speed2 _( s+ J( l, p6 { }7 U: U* J( @
ask turtles [ set-car-speed ] h& s2 f* p1 n0 A. S {$ G
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reset-ticks
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2 b0 y( f) i7 [2 o$ ]2 n! D;; Initialize the global variables to appropriate values$ ]/ q( U% K m: o9 B4 S
to setup-globals8 C+ A3 y1 H- Q; `
set current-light nobody ;; just for now, since there are no lights yet
: M, n; ~$ T- Q9 t8 W- B! m set phase 0# ?. P) s) M: z, \
set num-cars-stopped 0
$ N Z l: _% D; H( ~7 k" o: ^/ V set grid-x-inc world-width / grid-size-x# s0 G7 N) |5 R8 p
set grid-y-inc world-height / grid-size-y R+ a/ q. G9 r; D
4 @3 d1 u" b4 Q3 C3 H9 | ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) K8 y) S- T. s) h/ n
set acceleration 0.099; n9 v e* w# j
end* c3 R, K# N6 Z: H6 p" O
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# q& \6 H% r3 p;; and initialize the traffic lights to one setting
/ t% f, `5 Y n- E2 t. x; Uto setup-patches
: f1 Q- K# z) v# A ;; initialize the patch-owned variables and color the patches to a base-color
' o3 n( E4 K* ` ask patches
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2 _+ c' S: x3 Z; {) B set intersection? false
: a% ^+ c5 C4 K3 C, C set auto? false3 ~4 @/ H& P- K/ V, t6 L
set green-light-up? true* b! e" d! F1 t& s# t
set my-row -1
; ^. w. _0 R) t, j9 d& h* j set my-column -1
3 \1 F0 _! I4 k% Z' V- O set my-phase -1
& C' X0 w/ Q3 p# D# _2 Q set pcolor brown + 3. ~. E/ g: m: [0 U( u
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" P( _2 w* N' J: b! W$ V: w' u ;; initialize the global variables that hold patch agentsets
- l8 f1 \! s9 b# U set roads patches with% i5 J( S2 j/ x e4 s) T3 B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, g+ V+ d3 L: a ^! U6 h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' I5 l. p7 Z* Y3 K! ^5 ?
set intersections roads with' j3 g) }3 L% R. G, A. M( j' M) L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, d9 B) C+ H E' [4 j' h
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ c) }: o/ O4 r9 _9 y6 w' C
9 s1 f. K0 b* P8 ? ask roads [ set pcolor white ]# m" y6 {0 q# |" \1 ?: C1 N5 V2 J
setup-intersections% e+ f) i+ T$ x6 q
end
; J' H$ y4 p6 ?2 @ [0 L* ?3 V5 d其中定义道路的句子,如下所示,是什么意思啊?1 I6 E( z8 B0 q( m3 r
set roads patches with" U) j: l/ T6 w. T- w$ P. [# \
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" o4 S( @/ \; A& n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 Z6 S8 d$ S# I; d; g: H$ F3 l/ A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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