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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。
7 Y! O4 b/ F0 O1 L" y6 nnetlogo自带的social science--traffic grid这一例子当中,+ e8 z! g. M% M: v6 t2 P8 k2 g
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
1 e* ]. u: Q2 P6 k, O4 I grid-y-inc ;; the amount of patches in between two roads in the y direction
" Q+ W: ]0 M3 V8 t+ |4 y# X acceleration ;; the constant that controls how much a car speeds up or slows down by if: W6 O8 |2 X. h4 S* \
;; it is to accelerate or decelerate) z. j& X5 X9 H+ _
phase ;; keeps track of the phase
( g1 ?0 ?/ L% { num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. `3 ~9 F0 \9 t
current-light ;; the currently selected light
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$ Q4 Z1 |( Z3 W2 t9 {' M+ Q ;; patch agentsets
! k- k+ o. k9 a9 k7 a intersections ;; agentset containing the patches that are intersections
1 |1 [& N3 ]$ z6 t roads ;; agentset containing the patches that are roads
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turtles-own
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6 z: ?( d6 F/ }' y3 ~ speed ;; the speed of the turtle
- {' \5 S+ s" T! t! O9 `! a, [8 [ up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 |3 d! n# [3 Q4 X: ]4 ~1 \, e wait-time ;; the amount of time since the last time a turtle has moved# H' J# A8 r1 s6 E5 U* X7 h, V
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9 d2 [3 L! `3 |" ]patches-own
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intersection? ;; true if the patch is at the intersection of two roads
/ N% t3 T7 N0 A* m green-light-up? ;; true if the green light is above the intersection. otherwise, false.
D( n5 d7 E- Q- x0 M ;; false for a non-intersection patches.
7 C) V* J+ n5 a6 E, ~. o my-row ;; the row of the intersection counting from the upper left corner of the
/ D% i! I$ @; O3 @# O$ Q, j% o ;; world. -1 for non-intersection patches.1 e1 N1 B- R' o. W3 K8 E
my-column ;; the column of the intersection counting from the upper left corner of the5 {8 l2 Y# J8 X! p5 }3 e# e. f
;; world. -1 for non-intersection patches.
3 E- o. \, S. Y2 y my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 z2 Z3 Z8 f) P- J auto? ;; whether or not this intersection will switch automatically.
/ D( G( e. H+ n: Y ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
# q3 ~- d. D. \& X; O" J' Q C;; Setup Procedures ;;" G/ W5 q% y& A/ ?8 ?3 h* f
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$ w( W. A# v5 |8 A) e3 Z# l;; Initialize the display by giving the global and patch variables initial values.
2 w# S/ k' j. W8 W! z% Q- ?7 W;; Create num-cars of turtles if there are enough road patches for one turtle to1 l/ ^+ [2 Y$ t1 k" b0 {
;; be created per road patch. Set up the plots.
0 S5 @; V3 K$ K& v4 D1 ~7 Ito setup
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setup-globals
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+ D( p6 u8 E6 y% S- t! | ;; First we ask the patches to draw themselves and set up a few variables! C7 S' i1 q( P @: I9 j/ Z6 E/ _
setup-patches
9 G* s+ L8 J$ P6 ?/ B% d% t make-current one-of intersections
% f$ r: j, g/ }4 B0 Q" B label-current$ p; ]9 n M1 z! R
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set-default-shape turtles "car": I/ F5 X& G0 V; i
: i* b' r1 i) Z- m9 ~6 C2 G: Z8 ?) C if (num-cars > count roads)
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6 Q5 }" f5 u8 ~. v; }( J, v user-message (word "There are too many cars for the amount of "$ E1 b( l& G/ ]) d
"road. Either increase the amount of roads "
( E s( ~9 {) _ {" z "by increasing the GRID-SIZE-X or "9 G5 k( o. `4 t9 w z4 R
"GRID-SIZE-Y sliders, or decrease the "
0 Q! t0 W5 j3 T4 J8 |7 M* Z "number of cars by lowering the NUMBER slider.\n"' ]5 U. J8 A# H4 R; U) ~
"The setup has stopped.")
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1 E. R1 N% o8 F; l+ e ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 |" N% C! [7 o6 D, X crt num-cars
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setup-cars
/ Y# C: l! ^+ z+ k set-car-color4 T) k5 a2 k5 ?" B U( y5 d1 K
record-data( V" p4 i5 [( q! A; p* B7 w# z
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, _. T9 v" d# z5 V0 B: }: | ;; give the turtles an initial speed! ~" E: s" y6 {! H, p% ~
ask turtles [ set-car-speed ]. x2 c. m$ d/ @6 Q7 J0 `- l
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reset-ticks+ l# v8 N) k! H5 P
end" U2 v, U; K* ]" Z" I T5 H7 H
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;; Initialize the global variables to appropriate values }' X; p4 y9 d" U
to setup-globals
- ^/ w" h: D; X8 t5 V3 [ set current-light nobody ;; just for now, since there are no lights yet
7 C4 ?* f4 u" g5 h- ~( W6 a set phase 0
4 _! |* V: X: B1 f set num-cars-stopped 0% a# p. f0 S, L0 z! _
set grid-x-inc world-width / grid-size-x7 t) x( L6 R1 Z
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& i4 S' s7 o: n! L
set acceleration 0.099
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- n% ~( B9 ? W3 v5 \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ M S7 L3 T. J7 C7 U# ~- P* ^( P;; and initialize the traffic lights to one setting* C: Q' y. E* e! @
to setup-patches
1 O" }7 |5 D: I/ O4 Z* w, S ;; initialize the patch-owned variables and color the patches to a base-color; o. L" x& d3 J& \9 p* P8 P: V) e
ask patches. U9 m% J! u; ~. y5 b# h0 s N4 O
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, Q! a# B/ m5 ]& h5 ]5 e set intersection? false/ n A, d) s! O/ b% B1 B
set auto? false
; U$ w* ^- Y0 E2 l set green-light-up? true
& H4 @$ f& K' i) ^ set my-row -1: H" [9 L" Z( }% ]! K, ?! p2 P/ _; z
set my-column -10 M; r8 c3 t& k& B$ Z+ `# ~$ O
set my-phase -1' \3 b) d: [( k
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets( Z0 a7 R2 g3 Y6 Q
set roads patches with% y! J3 K/ t& d" l" S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) D6 Z t [' |8 g* M: l* r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* k, n( L- ^6 F! P
set intersections roads with7 E/ O1 b. i! F$ O4 B5 f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, y4 t4 u% ~1 Y/ K7 l7 N. Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! b. @1 c2 U$ h: R; Z2 G" b
7 _( u, A9 c. c5 p ask roads [ set pcolor white ]+ X. K/ q! X$ M. Y3 t
setup-intersections
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( A9 P& x- G3 M* m/ ~2 N1 M& Y其中定义道路的句子,如下所示,是什么意思啊?$ j2 s) w4 E$ x0 J& N. ~/ i; _: h
set roads patches with
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$ A O' S1 h$ y- d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, E- q2 f' y) C% d* O Z2 X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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