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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。
( K8 `3 Z, ? z9 @& ?, g- |netlogo自带的social science--traffic grid这一例子当中,/ \: n+ l9 X5 n; O2 \* [9 |" j* ~0 G: s. H
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction' ]4 c( z3 f) B8 o V) l( Q
grid-y-inc ;; the amount of patches in between two roads in the y direction2 e8 C$ u8 i/ P n* h
acceleration ;; the constant that controls how much a car speeds up or slows down by if" H! V0 n$ f" @+ g
;; it is to accelerate or decelerate
* k; d9 v7 h3 J$ `; k phase ;; keeps track of the phase, w* g. C2 W( W4 W. c, i' S7 o
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 H8 C0 h2 L2 q4 o) q current-light ;; the currently selected light
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L* d; K) W: o ;; patch agentsets7 C; f& \5 `% F) }3 B) j
intersections ;; agentset containing the patches that are intersections# X* V# s' W7 E9 ^. @4 S
roads ;; agentset containing the patches that are roads, j- G; ?% i% P; {5 a
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turtles-own
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3 [# t' v6 H0 S t" V speed ;; the speed of the turtle
% l! K/ I5 ]/ j5 a up-car? ;; true if the turtle moves downwards and false if it moves to the right3 t) ~8 Z+ W ?* m M* w0 C2 m4 x
wait-time ;; the amount of time since the last time a turtle has moved; X! _: R/ j0 U( B$ a, b4 X
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5 G0 }$ p" T. A- o+ R: l1 z( ]patches-own3 R4 o. R" e; K- y/ T# M
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intersection? ;; true if the patch is at the intersection of two roads% C: V* v6 b" \. _6 y3 e' t) y M' k+ B
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% y" J" ?/ z, F* m/ S ;; false for a non-intersection patches.- x: M1 u0 M' y
my-row ;; the row of the intersection counting from the upper left corner of the
, q! D$ p; K, m: s% f u" S% R! _ ;; world. -1 for non-intersection patches." n! [4 R! H* X) x
my-column ;; the column of the intersection counting from the upper left corner of the) ~, f) s6 ], x( M9 M
;; world. -1 for non-intersection patches.$ c: m: |$ _0 J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 {( A# }& _, ?/ e6 S z9 v4 s% w auto? ;; whether or not this intersection will switch automatically.5 A5 V, ^8 X( J5 W4 e5 o0 \5 a$ Q0 v
;; false for non-intersection patches.0 I$ P( j% ?) b% {& H0 R9 r
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;;;;;;;;;;;;;;;;;;;;;;6 M! P% c7 M# d7 U
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.4 h3 `' V; u, I) x8 t: i. \; [# ~
;; Create num-cars of turtles if there are enough road patches for one turtle to
; S. _4 x( B, E+ x7 @1 k;; be created per road patch. Set up the plots.1 c. q7 k: [, u8 d' O, j
to setup
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setup-globals7 i4 k0 G2 j9 r( g* k" |
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;; First we ask the patches to draw themselves and set up a few variables6 k. W7 h: P, \* }0 T
setup-patches* e3 b& \5 P: R% W' G# }
make-current one-of intersections }1 W) P9 q# D
label-current
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* {. {1 R) J# O 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 "
t& A1 ]4 N8 O! M8 w" c "road. Either increase the amount of roads "
. Y, x7 Z/ i! y/ r "by increasing the GRID-SIZE-X or "
3 O2 `$ F% V* G) G8 u4 } "GRID-SIZE-Y sliders, or decrease the "
) J1 k+ G+ [1 F. |! \3 X0 g "number of cars by lowering the NUMBER slider.\n"3 E% v& e+ F9 H" v5 j
"The setup has stopped.")
1 W! I+ M' I4 a2 x3 z stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" L& `/ U! t1 t/ t5 {0 Q crt num-cars( [1 Y5 h- C( {4 _
[
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set-car-color
. S- i& a; B1 v# N record-data
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;; give the turtles an initial speed
1 B! U$ l) v) C1 u g. w" @ ask turtles [ set-car-speed ]
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reset-ticks
/ G) @1 g0 p1 E9 Fend
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;; Initialize the global variables to appropriate values/ ^' C5 [: T5 ^; q
to setup-globals' W3 W$ M5 |! `4 I) F. F
set current-light nobody ;; just for now, since there are no lights yet
! V% X- p3 R2 Q set phase 0
% N* ?( N' M+ Y9 R set num-cars-stopped 0
8 ^ D. ^0 v. d set grid-x-inc world-width / grid-size-x$ k8 H9 F% u; ]8 O$ t
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 boundary8 G* ]: ?/ x& C7 o$ i6 Q
set acceleration 0.099& Q! f/ V3 j$ @5 j/ b
end
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, n* d9 j. E3 R x5 N+ u7 t;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( |6 k3 u6 S2 \8 k# k; p' H
;; and initialize the traffic lights to one setting
$ M- O+ u5 v1 f4 _9 I! vto setup-patches" d+ m: Q+ d0 W- {6 H6 l
;; initialize the patch-owned variables and color the patches to a base-color" M4 U) j7 ]7 _5 d; k/ @+ A1 g
ask patches
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) N) B- c6 A" B) W0 H4 T. c+ W7 p set intersection? false
; H' p( C# @( y) ]6 u0 n) r; [ set auto? false
, g/ @, d# j% h& T4 t" O set green-light-up? true- K5 a I3 |0 z; ^
set my-row -1, O! h( a2 F6 R% D
set my-column -1; [( P ?8 s* T9 k" r( E
set my-phase -1
* }. }' a& ~& L set pcolor brown + 30 M) } r* U @" y, p. i
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8 X- Z& e% I; C( p! D9 [$ W# e1 G+ H ;; initialize the global variables that hold patch agentsets0 z! f: F {( R8 R
set roads patches with6 I9 H. I- u9 W2 I3 _7 c- }/ J- i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 r- Y" @" s# A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ v( V# Y, W! U1 g! r1 p
set intersections roads with
8 X" ~4 m: {+ u# c2 C: C, m5 [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" \/ W/ G& q, O p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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6 b& ^( C6 m4 s6 N4 a ask roads [ set pcolor white ]) Q) i- O+ J1 a* F( d
setup-intersections: s- j. j N) ]
end
: j: Z# X, Y" m+ T1 C6 @其中定义道路的句子,如下所示,是什么意思啊?
3 b( @. o2 ^( R/ U' ? set roads patches with/ w# |4 K2 ]( _! ]. F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 [! y0 R7 u) x8 d8 S/ x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 W5 l7 w. F B1 t! m" l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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