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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。
. g0 `- K5 K% d8 Z5 N) d8 e& gnetlogo自带的social science--traffic grid这一例子当中,0 m1 h- i. M, e
globals( S p: X# O( Z- L! @& m1 \2 E" P
[
4 e- l( ~+ ?6 H r1 F4 O: |3 x grid-x-inc ;; the amount of patches in between two roads in the x direction
- D" f0 n1 H% _) f9 R. c! H grid-y-inc ;; the amount of patches in between two roads in the y direction
! b# F, [( [7 Q% n P' |: X4 e acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 ^* ?( w" ^; o4 G+ i7 L ;; it is to accelerate or decelerate# z- A+ U6 l2 q# g
phase ;; keeps track of the phase* b1 r' [/ w; X; C
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- ?" w# H: ?9 C( a& s current-light ;; the currently selected light
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- U5 c$ \. v2 J+ N# }; i ;; patch agentsets2 q) V# Q2 `# a- F7 g- H
intersections ;; agentset containing the patches that are intersections
7 w' w- z" a$ M0 M5 f* I roads ;; agentset containing the patches that are roads/ x$ Y! K& W# u- h# Y
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1 j3 T% |6 ~6 h, [# j3 qturtles-own
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$ x0 C/ B" A4 p0 t$ \8 B h speed ;; the speed of the turtle, c) H: r: t0 B( M w% F
up-car? ;; true if the turtle moves downwards and false if it moves to the right3 B0 R" r8 L& V8 e i: e
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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5 o. h6 m0 G; b intersection? ;; true if the patch is at the intersection of two roads
+ s. h: ~9 m! h, ^1 M green-light-up? ;; true if the green light is above the intersection. otherwise, false.2 n/ T2 I- S$ p
;; false for a non-intersection patches.
- Y8 n$ ^, A$ o( G2 i* n% C my-row ;; the row of the intersection counting from the upper left corner of the5 h/ v9 I# o1 Z9 @ W$ j
;; world. -1 for non-intersection patches.3 d! g- E$ X9 y7 ^1 H
my-column ;; the column of the intersection counting from the upper left corner of the+ |% r+ g) m: _1 z$ R
;; world. -1 for non-intersection patches.
/ M! b5 q, i- X( m; O my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: x+ K# ?: e: G3 a/ K: R! |7 N auto? ;; whether or not this intersection will switch automatically.
) C8 T: \0 a0 L+ k4 D8 _ ;; false for non-intersection patches.
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5 E) v5 c# ~9 p2 y& O5 j8 r;;;;;;;;;;;;;;;;;;;;;;
' H8 G5 y2 u2 i: K% Z; Y;; Setup Procedures ;;
5 Q* W* R. T- Q8 C: i# ?8 W$ ?$ W: o;;;;;;;;;;;;;;;;;;;;;;
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" _+ [0 a0 \: N H8 X1 e' w0 h( g;; Initialize the display by giving the global and patch variables initial values.* B. }9 l3 J7 R6 m- T
;; Create num-cars of turtles if there are enough road patches for one turtle to1 [( @" u/ q, [& O/ V/ r
;; be created per road patch. Set up the plots.& V! W3 p [$ w0 z
to setup
# Y0 D1 s% S6 R- G7 O- A( ?7 m ca/ u" K! ], i0 X: o" q' j6 Z
setup-globals
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; O- n' D& [, m V" d7 Y ;; First we ask the patches to draw themselves and set up a few variables N) `) |2 Z' \- p: f7 r
setup-patches
, S/ w( u2 L' G6 Z1 P* u6 ^8 V make-current one-of intersections
5 S4 w1 N$ ?. U5 {7 \2 G ? label-current1 R. b; I/ A, g( P5 {
) L& g, v$ n0 z3 W0 T* ? set-default-shape turtles "car"" {9 M/ n) c4 Y. U
6 e+ N" v' G5 V) P' w: R8 D if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "9 E5 L9 }3 k' T, o& t- K- z
"road. Either increase the amount of roads "7 i. F# ]8 e( M9 M2 u& \
"by increasing the GRID-SIZE-X or "
& p' X9 Q; B2 k+ ^' Z "GRID-SIZE-Y sliders, or decrease the "
( t5 D, @: I! z+ I0 O- w "number of cars by lowering the NUMBER slider.\n"
8 B6 |) C) O; v5 n8 { "The setup has stopped.")
; z7 b* I4 j9 K# l0 j, A stop- j+ G- F; a8 `2 l9 h
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$ N7 _% p& F o9 B ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ M2 P/ D/ n$ P' V
crt num-cars
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' \& h9 Z- ~$ ~5 y$ ~ setup-cars* b/ N) t& s; e
set-car-color
& U$ O7 x) y5 u; ]# Q record-data: c2 o: }2 }4 L$ U) ]" S
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' J- b$ r& }: b! p; L5 s8 R ;; give the turtles an initial speed$ M5 x" t3 y8 h, n( N0 G/ H' i5 y1 y
ask turtles [ set-car-speed ]& }- w" h/ K8 A& u; Q
z% ~/ f; b1 L& ]4 [ K7 y reset-ticks
* c& c. S* N9 l3 ?end" C: a& W( {& g: K
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;; Initialize the global variables to appropriate values: P& V; l4 E+ b5 m& S5 J
to setup-globals, K4 E o* l& V0 w0 |+ E) R
set current-light nobody ;; just for now, since there are no lights yet2 l# ]! S+ d, B
set phase 00 a/ H3 W# w3 N
set num-cars-stopped 0
" j: y) ?" ^+ v( z9 m set grid-x-inc world-width / grid-size-x
3 g0 v T( r6 \' `5 H/ e) g6 p set grid-y-inc world-height / grid-size-y
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% T5 Z S9 M- N. D$ T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# M/ Y+ T3 ]4 d K set acceleration 0.0996 w8 T; N" X6 N1 {- ]- v; J
end
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" ^/ u8 P/ H+ {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' d4 d! i0 N6 L# I
;; and initialize the traffic lights to one setting
2 P( H2 k- P; v$ }- Fto setup-patches
5 f' G' k& g$ i: K, k g ;; initialize the patch-owned variables and color the patches to a base-color& t! E( }5 s/ _3 h0 B
ask patches* F( ~7 u' v/ f& S
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set intersection? false
+ J. m( M f6 T) A set auto? false5 f6 e7 v+ I9 Z5 l+ b
set green-light-up? true+ S+ o! X$ A, q% [3 O
set my-row -1
5 B! V' r" m+ O) B set my-column -1
5 }) S& M) V" y7 R: m8 x1 O set my-phase -1; s( _: U8 l! W0 F
set pcolor brown + 31 }4 K9 s; J1 F% z* _0 j4 i
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;; initialize the global variables that hold patch agentsets
5 D- v1 R+ i3 `8 F% p* a" `; } set roads patches with
) U7 G) T5 \9 J9 W9 Q6 s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' k! s& N2 F7 H, C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 y& q8 L7 b/ L+ X/ k1 U5 a. j7 z set intersections roads with
8 d! D4 e8 E) K" \+ R# u! F# @3 \7 L [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! |) J% n' V- R e, h' U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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# {- o) f0 E4 }" Z7 h+ [ ask roads [ set pcolor white ]
6 j. K% w' w: g8 y9 ^ x setup-intersections
+ i0 x$ d) m. I. Q: X+ U9 L: Jend
! `! i. E3 t9 @% A& U* _; V其中定义道路的句子,如下所示,是什么意思啊?
9 ~9 M% _# @5 [ set roads patches with6 w5 }' ^, l+ l" B7 i( P7 H. @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 y u& F6 _# n& ^6 ?1 f3 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. U" r- k9 ?6 E
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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