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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。
2 A0 m! g4 W. S8 f7 bnetlogo自带的social science--traffic grid这一例子当中,
5 |/ V! M% l; V% }/ iglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
4 @9 o; w0 J5 c0 P5 m4 ]$ d9 b9 T, { grid-y-inc ;; the amount of patches in between two roads in the y direction
/ a4 c) V& {% s! m' m3 @/ p acceleration ;; the constant that controls how much a car speeds up or slows down by if: z5 r/ U& k# j$ L+ j, G
;; it is to accelerate or decelerate a3 o& c1 F$ v) i
phase ;; keeps track of the phase2 T5 G" b: \" r( T
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. V" y! l6 C6 v0 @5 c+ P& }4 J( z current-light ;; the currently selected light
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, k+ C+ I( f4 V+ m0 D, Q ;; patch agentsets q2 }& t9 ^1 x5 ]; B) N% G' V
intersections ;; agentset containing the patches that are intersections
8 u1 Z8 D) b" U( y4 r, P& O roads ;; agentset containing the patches that are roads2 Z+ J# `' X: F' i, J5 t; R) h) G7 } j8 C
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7 f- _# L2 w! Pturtles-own
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3 k+ L% m5 j; y( q speed ;; the speed of the turtle/ {+ k6 \2 V: k/ v
up-car? ;; true if the turtle moves downwards and false if it moves to the right
$ y b6 B0 {" [ wait-time ;; the amount of time since the last time a turtle has moved+ d' p( m+ H) s+ z
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads3 ^" \" q/ ]7 }
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) `+ _+ G) `: ]9 E ;; false for a non-intersection patches.
5 @. G% r6 V) K" { {- ] my-row ;; the row of the intersection counting from the upper left corner of the- j- e7 m: P) H- l! }$ C% Q
;; world. -1 for non-intersection patches.
9 m- {* ?0 \' e. a0 n& g* w my-column ;; the column of the intersection counting from the upper left corner of the3 m p4 M) h/ U8 L6 Q4 @0 b- a9 y
;; world. -1 for non-intersection patches.
5 t' B X' w# D my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: x4 e' \; |; } auto? ;; whether or not this intersection will switch automatically.
+ Y/ s! G7 u, s' [/ ?4 d ;; false for non-intersection patches.) d3 d; L* r+ t2 e8 N$ Q5 N) B3 J
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;;;;;;;;;;;;;;;;;;;;;;. p" n$ W# ]& z* s' {" ?
;; Setup Procedures ;;
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$ [! X- C- b) q% P( g9 b* |. };; Initialize the display by giving the global and patch variables initial values.6 e6 X+ n, G/ K) }( P9 ]/ ^ n
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ k: d" M1 f/ E) ~8 |;; be created per road patch. Set up the plots.
4 q, ]' Z: T7 H3 @4 x/ kto setup
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( A F8 }& R/ L0 v5 |6 N setup-globals) _! r' z+ e. D0 }
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;; First we ask the patches to draw themselves and set up a few variables
, |* u7 _7 }# X, d& T$ n8 U setup-patches; u! L& }3 m$ j
make-current one-of intersections
: H! G- a" N6 H( e J label-current
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set-default-shape turtles "car": \7 N* A& `2 X
* x& ^! `( y9 l4 ? if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "$ B' ] ~# l$ I. n. U/ z
"road. Either increase the amount of roads "
R% B" w/ T5 s! D$ [3 J "by increasing the GRID-SIZE-X or "0 U! X& L0 ?4 `0 z
"GRID-SIZE-Y sliders, or decrease the "0 D# s, g3 t( ^
"number of cars by lowering the NUMBER slider.\n"
5 @- S2 w# Z6 H8 p# z% [ a# b "The setup has stopped.")
7 _: L1 h$ U$ P3 A% N m stop- V9 ^/ |0 i' y- \$ [! u1 \
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 v8 I6 F6 s. o# ~- `6 t crt num-cars' f$ x: X9 c8 w/ x: i! _+ \+ b$ n1 N$ O
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setup-cars
6 z8 K1 C: E. h! O" I set-car-color d$ C" M9 o D9 D& j# L/ S
record-data
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) O: m$ R0 l' d5 ]9 j! s7 `5 l) G ;; give the turtles an initial speed4 R& k7 I6 w/ D: l5 h3 A* C9 o- Y* G. `9 a
ask turtles [ set-car-speed ]! U5 i$ I4 D# e, X4 g* V, M4 ?
' n: R& L& f. B F) F* b. X0 s reset-ticks
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( D2 ~" ?1 {. N. A$ m" V: u9 |;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet- i2 B3 U2 N/ s: T: m9 M3 B
set phase 02 B5 E) L, t" W& |, F- A
set num-cars-stopped 0# x6 Y, R/ Z. k! L' K/ ^; d
set grid-x-inc world-width / grid-size-x
& J* D7 y. z6 v set grid-y-inc world-height / grid-size-y
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4 e; ]% y5 @8 B7 n* z- E: |/ ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. d# @( \/ @8 U set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets," b$ v2 i4 e, J. Z" I
;; and initialize the traffic lights to one setting
5 ~8 y: O- q. ~to setup-patches
7 ]3 M8 z1 |/ [1 ~; Y( q ;; initialize the patch-owned variables and color the patches to a base-color" [& ^+ h" U: X) P$ J2 S( B6 h
ask patches
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set intersection? false
7 \# u1 [- I9 c set auto? false
6 r8 J! h w3 X9 [& O+ ]" ] set green-light-up? true
7 W6 V p$ v& l set my-row -1! M0 Y1 a% y/ v' C6 F& F. m
set my-column -1% X I( j5 G& O5 g
set my-phase -1
, B0 t. h& A/ x2 |7 { set pcolor brown + 3
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1 b- A/ f' r$ w* a. Z ;; initialize the global variables that hold patch agentsets# [# Q. R" d6 |3 }6 S5 e
set roads patches with
( T# e6 f! @3 t4 Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 c! ~- s2 ]( A% Y# X+ u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& F' f" V7 x' ?% O' y set intersections roads with7 H; H( \) H! I( h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 z1 ~% Z! G" g2 u) O( ~' a5 _ b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 p. ^. w2 F1 g6 ~3 Z! t: _( D
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ask roads [ set pcolor white ]. |, P5 i! o: R- v
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?6 u i j6 t0 |& a
set roads patches with) A7 D: y0 Q" k! D; i# {) G1 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 M& W, D# z- H8 x K! x0 _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 y9 _1 b/ c# t6 {" w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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