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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。- ]' t( g* U6 ^
netlogo自带的social science--traffic grid这一例子当中,# j5 _" ?& ]' _8 e
globals+ u$ J% z( d% `4 A/ G
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grid-x-inc ;; the amount of patches in between two roads in the x direction# Z/ a% _/ r D; n$ g, t
grid-y-inc ;; the amount of patches in between two roads in the y direction8 x" U |- [7 ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 n: t8 i* D& [ Y* ]
;; it is to accelerate or decelerate/ g+ y/ o/ _9 g
phase ;; keeps track of the phase
& C F+ Y& Z( S num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 I5 J# {# G7 C' m: o3 X7 B" |
current-light ;; the currently selected light @2 q' S! E- y, g8 t- ]9 d* g
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;; patch agentsets0 I, P/ l, A: `! S6 X
intersections ;; agentset containing the patches that are intersections
5 E1 o1 f6 t6 L' V8 s8 @ roads ;; agentset containing the patches that are roads
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+ O- ?1 f/ d, S* ]) Iturtles-own
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speed ;; the speed of the turtle
; |! z* |' s* Y6 ?6 k1 D up-car? ;; true if the turtle moves downwards and false if it moves to the right
% p% ]+ a/ P" `1 j wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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8 [) Y3 J6 n4 n9 {5 g intersection? ;; true if the patch is at the intersection of two roads7 C" k* i7 d- ]5 }, Y2 {
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) [# D& O \ O3 Y& P
;; false for a non-intersection patches.
4 E: z& X* {0 e9 H8 K+ s my-row ;; the row of the intersection counting from the upper left corner of the$ f3 E/ H6 r( \6 \, V- U
;; world. -1 for non-intersection patches.
) P' n2 [6 W ~# r" ~% p* i0 v my-column ;; the column of the intersection counting from the upper left corner of the+ A( O' }1 f0 b1 Q+ \7 B* h
;; world. -1 for non-intersection patches.0 V. {. u. b. g' g% A
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 X2 M' W4 r( _, ^3 u" E auto? ;; whether or not this intersection will switch automatically.
4 n: ?' l7 i$ k0 f2 u; T ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
2 s' M& q$ m- d& S9 @6 t;; Setup Procedures ;;1 O8 e: [! n) u, }" W B6 u- J6 y4 y$ R0 b
;;;;;;;;;;;;;;;;;;;;;;3 d( d$ T; U4 s& A! W
O; [ g9 P) b;; Initialize the display by giving the global and patch variables initial values.' j! N' u3 `8 R
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ q( \1 N. v/ w) G! j;; be created per road patch. Set up the plots. j% F. | Z H0 r- ]
to setup( ]. p% }( V: C5 I
ca
; ~5 o/ d6 X" l' A) s8 o- c7 \7 r$ i! F setup-globals9 }! |9 f2 Y4 ?3 m
% J% Z2 L, G$ ]0 o/ }. o; B ;; First we ask the patches to draw themselves and set up a few variables
( d, x5 j0 @; T z setup-patches
6 { z# Q5 o9 `) {% H% c make-current one-of intersections: C: k* s+ Q, E2 l/ I
label-current5 H8 f- ?, a; G5 Q8 ]
. E8 _! r$ i, D9 D: H set-default-shape turtles "car"
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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 "8 X3 |, E, y/ f! U: U. s
"road. Either increase the amount of roads "
+ |& m& P1 { F/ O! O "by increasing the GRID-SIZE-X or "
6 `2 Y, k; C; y "GRID-SIZE-Y sliders, or decrease the "6 O) d5 d4 A7 v
"number of cars by lowering the NUMBER slider.\n"- X6 P1 v/ Y& R) K& f
"The setup has stopped.")
' i! s9 L/ R/ R- [8 `* @; A3 K stop
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# B) T9 n9 r/ I* a ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% v% d! V$ J8 \7 \ crt num-cars) S# T9 x+ ?2 x8 C7 a8 ]
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setup-cars3 W3 b5 q5 l7 O
set-car-color, L4 k8 p" [2 ]+ [' F/ V# l' U0 m
record-data1 O* N" j7 \9 {% _/ M2 a$ O
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;; give the turtles an initial speed
9 C1 }* D: o" p- n* J. f ask turtles [ set-car-speed ]! Z+ q7 N5 `2 f# E1 W
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reset-ticks* o' y' ^8 E9 K) P' ?: t
end3 O+ O) y V; |& G7 C. Y0 Y9 w7 G
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;; Initialize the global variables to appropriate values
0 q; {8 [: W$ l* wto setup-globals
; }/ \1 H) f5 ^4 I8 W; i. D set current-light nobody ;; just for now, since there are no lights yet+ e# v8 a) ^! x ^; c% l$ i
set phase 0
, E; h2 l) L5 X/ ?0 G" w( t0 i set num-cars-stopped 0
) v" Y6 I* `# [; z6 ?0 v% i2 q( v set grid-x-inc world-width / grid-size-x
% B1 v9 X" B- C set grid-y-inc world-height / grid-size-y
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0 `: F( `1 @* N" I" G* ` ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' T, T1 [/ |4 Q1 |+ n% i8 @. i
set acceleration 0.099( u9 C) k& d+ K: U+ y% c
end6 K; t1 }+ I$ F% ^8 F
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 ] Y/ l$ {/ F& c* G/ w" P7 {
;; and initialize the traffic lights to one setting8 v0 c, Z( [) }6 ~4 [
to setup-patches
6 N8 g5 N! ~7 N ;; initialize the patch-owned variables and color the patches to a base-color+ M, ?( h5 x6 P M, K$ _9 D
ask patches
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set intersection? false6 Z( H$ J+ T8 w; E
set auto? false2 X4 M. `/ J+ Q+ F& x4 [" j
set green-light-up? true% g+ Q3 g1 N, A- ~1 _* {# |
set my-row -1
! z; R9 t d+ r' P! w% L set my-column -1' [/ i4 V% w* o: K# U7 U1 r) ]! e7 I
set my-phase -1
3 A& s) K5 m2 @( W8 ^- Q; b set pcolor brown + 3
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) C2 C% P/ }/ Q" T; ^! i ;; initialize the global variables that hold patch agentsets
6 s+ N2 ^1 C$ b! o) o1 m' P set roads patches with
8 C7 I9 A1 u2 r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. |, G6 G5 m% c$ j. X; i5 u& f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: q* f+ n% X" }% I; g
set intersections roads with! b- R5 `3 h! o. Z* v( ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 G% q# X6 m5 T: O) h) H6 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* S+ D' f6 X f' I% g
" Y* |% P7 W1 J* [ ask roads [ set pcolor white ]
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end
- S' N7 t% k$ c* x2 I& J其中定义道路的句子,如下所示,是什么意思啊?
- U7 Z' V" b# m4 j0 A& z set roads patches with b* K% \. @, D% d W* C( X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) |/ u6 J/ T! T& @! z) l! A( x+ ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. r: p2 \, H* {0 d# O. \% J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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