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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。
: D( r H* X( C. K/ F1 K6 onetlogo自带的social science--traffic grid这一例子当中,
$ B V6 N8 s. Z' }: h" Nglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction# U! d: f- `, C4 F
grid-y-inc ;; the amount of patches in between two roads in the y direction2 y6 V% a2 p% ]2 h
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 @' b- p6 Z$ y, a' `6 A
;; it is to accelerate or decelerate4 W0 ~! y& e( J
phase ;; keeps track of the phase. N, _7 R5 J# }2 {; x) K4 O L
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure6 I2 m5 h" {1 R0 m. K
current-light ;; the currently selected light" j& i! N/ E# p, H
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;; patch agentsets
" q8 Y2 G* F/ C" R. ~ intersections ;; agentset containing the patches that are intersections( W" V& {$ E, e
roads ;; agentset containing the patches that are roads
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turtles-own0 r$ p& t; u( s: J! ]. F( g" y
[
5 @0 s" U6 `, R6 A. o speed ;; the speed of the turtle
: D4 o( T. X+ c: v/ B8 O1 z6 i up-car? ;; true if the turtle moves downwards and false if it moves to the right/ D( l* A/ J0 R3 H
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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" o2 \! |' x' y4 K intersection? ;; true if the patch is at the intersection of two roads
5 e: W- K- N/ w2 y* x green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ ~( e8 z3 ?- C/ j4 h ;; false for a non-intersection patches.
2 x! t* q8 ]2 y0 e/ e2 Z my-row ;; the row of the intersection counting from the upper left corner of the
( U. g9 ~' i4 w5 U& o1 D8 W ;; world. -1 for non-intersection patches.
0 |7 D9 T2 |5 ]. ^* }, t6 X my-column ;; the column of the intersection counting from the upper left corner of the# ?* g' w: f% Y8 D: F- r. y1 j, B/ Z
;; world. -1 for non-intersection patches.
; t! b$ `0 [4 _+ C2 c my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ D3 w R0 ~5 L" z/ E auto? ;; whether or not this intersection will switch automatically.
6 o- D; S6 D. }5 m( y0 c2 ? ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
/ e& |/ w. c9 e% t5 c$ _: F0 R;; Setup Procedures ;;# _+ |; R- F. o
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.- n- H$ Q0 L+ N# I2 H( t0 s1 L- z
;; Create num-cars of turtles if there are enough road patches for one turtle to
# K) X9 M3 k5 h& G( x p7 w3 N3 X! p;; be created per road patch. Set up the plots.6 d: g* g1 d5 f$ I
to setup/ `+ s5 \# R+ N5 T- P
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setup-globals$ V' G U! ?- T4 O( T8 l
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;; First we ask the patches to draw themselves and set up a few variables1 C" m) e; @8 c) U
setup-patches
( H; O4 P6 r: f _- a0 T make-current one-of intersections3 R$ ^) j3 B3 v8 j
label-current
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$ f7 q) |7 H4 m" W) k1 Z8 r: b set-default-shape turtles "car"7 j! k r* b: a7 b
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "" a. ]9 ^- T. w4 I
"road. Either increase the amount of roads "
9 t, Y* K- ^5 @# U "by increasing the GRID-SIZE-X or "
9 `$ i4 x+ a8 I/ o5 S "GRID-SIZE-Y sliders, or decrease the "7 T7 c9 s, w9 i4 W% g
"number of cars by lowering the NUMBER slider.\n"0 ~) z" t& @* @ t' k
"The setup has stopped.")
# U4 X) T6 }1 }( E stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color [2 x% B. a1 K+ C
crt num-cars
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8 \6 A8 p/ t5 p2 p setup-cars
; x9 S- f9 l7 y! @# p5 p set-car-color
1 ?; S2 I+ c: M. | record-data* L" |- q2 U/ t2 v
]
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;; give the turtles an initial speed
/ F1 B) u0 c. P4 [' V% R0 G& ~ h ask turtles [ set-car-speed ]- E2 d, U" r) c! K* f
. t4 n9 t; i* b2 P- z; K( H reset-ticks, k7 N2 K3 o0 x! [6 H
end7 q1 h5 V6 ^- L
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;; Initialize the global variables to appropriate values) z( P7 {6 N/ c1 h% U" ]; ~3 s$ q; Q
to setup-globals) K* s1 {$ f$ V w5 H& t
set current-light nobody ;; just for now, since there are no lights yet# z9 w+ @; K2 W( r
set phase 0& Q& m4 O r% x" H
set num-cars-stopped 0
2 y5 ?# {+ H: _ set grid-x-inc world-width / grid-size-x
% c" R: n$ q# F/ n/ [! m set grid-y-inc world-height / grid-size-y
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# W6 K- d0 a. ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 O$ W/ R; o2 E- d* d5 F set acceleration 0.099& A( B y* y: j# s! ^
end' V0 s3 q: j N4 c
4 @/ K2 O0 J8 T9 H p" Y. _3 W;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# q, X P( r% U- ?$ p3 Y) A, @. X
;; and initialize the traffic lights to one setting
8 @3 A: O# s& ^to setup-patches
) L0 e' X4 h2 {& @ ;; initialize the patch-owned variables and color the patches to a base-color8 y. b' Y. y7 l/ }, F
ask patches: b8 K- M% K' I. m3 \, Y6 r
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& L- W. C7 B; I% B set intersection? false
5 f7 f0 n! E7 D9 k6 B& L: `" ~. ? set auto? false
) j ^3 [( R; J set green-light-up? true/ u" r' y' M& I7 \* \1 X
set my-row -1
+ X }8 x( ]4 o. u set my-column -1* F1 x& {4 }! w7 R7 u8 H
set my-phase -13 b5 u6 ]; b( U3 t0 q' u9 [
set pcolor brown + 3
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, J2 ?! o- z4 x ;; initialize the global variables that hold patch agentsets
" I9 u" G3 J0 X3 ` J set roads patches with: z! C: p. D! V+ n u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' A) |( W5 v s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% o( @* ^1 \$ I set intersections roads with
% _- b* J! g5 i2 ]' `9 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' O+ u& g4 {8 l- q, m& L, j1 f, o: I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]) U0 Y% B' W1 i+ H U* s
setup-intersections
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+ p& e4 d5 l# [1 d4 p$ }1 R# S; ^其中定义道路的句子,如下所示,是什么意思啊?! S5 X, L; h z2 }1 F5 a+ n! `& L- l
set roads patches with6 B% t0 E9 U9 _8 s; _5 [ ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ v, H9 ~9 M9 K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' D: L1 b( g0 R/ z# z+ m1 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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