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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。* g1 @$ a% J; t( X$ K4 \
netlogo自带的social science--traffic grid这一例子当中," n" l0 m+ A; g& h
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
8 q5 N# d" Y/ T! e" `0 |% ~& v grid-y-inc ;; the amount of patches in between two roads in the y direction; t0 F7 \8 h* [9 x' U* Z
acceleration ;; the constant that controls how much a car speeds up or slows down by if
& Y) ~% ~0 f/ Q ;; it is to accelerate or decelerate
. E0 H- ` y! y# t. | phase ;; keeps track of the phase; i8 n; e. P7 I
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% S0 d5 m+ E. f0 L6 e1 E4 P# p current-light ;; the currently selected light$ P6 K& V+ d) i$ P+ O
3 k ^; z* B1 u" } ;; patch agentsets
7 b* d( V6 m6 ]! l: G M1 e intersections ;; agentset containing the patches that are intersections
6 M0 [1 H% f0 i5 J roads ;; agentset containing the patches that are roads5 i+ P5 f$ @* d# _2 _* b
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turtles-own
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, y" x% ?" E1 p5 _ speed ;; the speed of the turtle5 z3 [, p5 E7 F1 g) Y
up-car? ;; true if the turtle moves downwards and false if it moves to the right
( \1 t3 J3 l( F wait-time ;; the amount of time since the last time a turtle has moved
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+ k! w- U/ z" D3 L, Q1 c) e5 J! q7 Ppatches-own
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intersection? ;; true if the patch is at the intersection of two roads$ P. a, o. e. s: a, N# a7 w7 G. H
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' N6 t( i4 G6 c q3 ^
;; false for a non-intersection patches.
( X# c5 Z. L& q4 M9 Q' E. o- ` my-row ;; the row of the intersection counting from the upper left corner of the
0 U0 b# L4 `7 n& E8 K$ n ;; world. -1 for non-intersection patches.9 k7 R6 [" `8 M
my-column ;; the column of the intersection counting from the upper left corner of the
, i: B9 U8 g' ~$ g& f' K1 u: p7 W9 O ;; world. -1 for non-intersection patches.
; t+ D* p% Y, ?6 g" K my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 j9 W# S7 a$ I# _2 |- O8 k/ ]
auto? ;; whether or not this intersection will switch automatically.
8 j) [; k2 [' q7 I3 f/ m6 i( w; J0 Z5 E# T ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 e( F6 T) P9 X9 x1 }& w m
;; Setup Procedures ;;- p W' Z! A& d* H$ y
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" ~0 e. S& b8 J, C2 |4 E;; Initialize the display by giving the global and patch variables initial values.
. i. q2 l9 {1 t F, R! b s4 l;; Create num-cars of turtles if there are enough road patches for one turtle to
* F$ f$ f1 e5 u G;; be created per road patch. Set up the plots.
$ [0 r: m% f& q# M: jto setup% Z- d: `# _- F o* {" M
ca
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;; First we ask the patches to draw themselves and set up a few variables
% ]3 u/ T5 U8 K* o setup-patches
9 G2 @8 J( ^2 ^& U. G9 i% _) } make-current one-of intersections# C) K6 W2 c0 K) ]/ |) s
label-current
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set-default-shape turtles "car". F% m5 Z$ { G2 ^- }
3 O, L. n7 A! ~. a. K if (num-cars > count roads)7 r! A# k7 p2 T
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/ Z6 j! P* c& A/ U3 ~ user-message (word "There are too many cars for the amount of "
/ w$ F- p( s: a% } "road. Either increase the amount of roads "
9 J: v$ \& {3 P3 q "by increasing the GRID-SIZE-X or "
8 ]6 ?$ Y! N5 }) {1 H& i/ [& H "GRID-SIZE-Y sliders, or decrease the "( p0 ~3 K0 X8 C
"number of cars by lowering the NUMBER slider.\n"
2 e/ Q, L. u" D$ e, q3 o9 e "The setup has stopped.")% k4 f x/ C; i" `, j: b
stop: }& r. ], W# `2 k9 Y1 H# W
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. o- z4 o/ l2 ~. x6 s* V y1 ^8 \' t crt num-cars G) X8 Y) m' D- C' c- X. E: {" l
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setup-cars* I; n& _7 l: S: E5 m0 {8 n
set-car-color8 H. @6 h3 Y2 T
record-data$ g$ L* n+ {/ X2 A9 Z, N+ |, z
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- ^ G* Q9 D6 N4 b4 y( I" u% n7 _ ;; give the turtles an initial speed
6 q* E3 Y1 }; ~) S$ ~! p& T ask turtles [ set-car-speed ]
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reset-ticks9 x1 P X' W: b1 o
end
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;; Initialize the global variables to appropriate values
, p% N, q, E' d }# \to setup-globals
' Y/ Z! _3 [7 ~- c9 v1 m set current-light nobody ;; just for now, since there are no lights yet
4 M% M* h: B, M- B set phase 00 e) L$ p( ^1 X) c
set num-cars-stopped 0) Q; s# u, X' R& W: D6 j: X2 m; L
set grid-x-inc world-width / grid-size-x
! r/ _: t1 ~, q# H set grid-y-inc world-height / grid-size-y
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. H9 Z' G3 B0 z8 S4 X# l ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# C ~, M9 `6 G' [4 v5 @ set acceleration 0.0992 s% N. l; }! n+ o6 x5 q
end
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g/ G. s$ H! m7 `: G6 Y% `;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
`6 R q6 J% ~" a% L, k;; and initialize the traffic lights to one setting: `1 J# M2 \: ~% V& s) x) ?1 p$ w9 l
to setup-patches
/ Y: i$ n! U( w5 [ ;; initialize the patch-owned variables and color the patches to a base-color
: v D, F: m) p- Y- C5 F ask patches
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set intersection? false' H R: e" g( K4 A
set auto? false% E1 C: O9 K/ r2 _8 Z
set green-light-up? true* b1 g! m& |" L2 {# f+ m8 V
set my-row -19 E2 w, n2 O9 C& s, T% l
set my-column -1" x* n% W, `. }
set my-phase -16 a( V5 N3 m) ~8 c a' E
set pcolor brown + 3& q$ T/ B- H8 G; r4 d
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* E9 o5 K( t" _. J7 E+ T ;; initialize the global variables that hold patch agentsets
" |* X3 k9 Y/ p+ D0 _5 ? set roads patches with/ Y" ]! o' Q: [ [( S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, R9 }& W4 R; ~/ x5 [0 n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* k- D/ o7 h, U# n' b6 ]+ ?4 Y
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]. b1 v1 r i: s+ J
setup-intersections4 F1 y0 \/ P/ M+ O6 s3 m; O1 Q
end
. f3 |% ~ O* @- t2 C( r其中定义道路的句子,如下所示,是什么意思啊?0 V8 S& y4 a: N5 j9 C+ q l
set roads patches with8 b* f e2 e0 g1 A
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ p0 [; V7 Z! e( W0 u/ ?7 H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ G: e0 t5 l! u* _/ S2 @; O
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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