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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。
! H9 z+ \; L8 ]; b) L5 xnetlogo自带的social science--traffic grid这一例子当中,) V w5 `& m( E+ q$ j
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ `2 d$ H2 Z+ W y- \! Q grid-y-inc ;; the amount of patches in between two roads in the y direction
, t/ u5 K( Z% C acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 A$ f# Y9 W: J% Z& r# m- \ L; l ;; it is to accelerate or decelerate
! P2 C! }+ Y4 e, H/ R phase ;; keeps track of the phase$ a6 J3 j5 {, `+ x" J& q! }) N
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' |' N5 y0 l3 V3 ?
current-light ;; the currently selected light
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;; patch agentsets
( A& o5 c6 f" f6 P intersections ;; agentset containing the patches that are intersections( ]* f" }, s3 ^. l
roads ;; agentset containing the patches that are roads
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9 Q! Z0 I+ S0 ?; {/ y& nturtles-own$ s, w, R* p6 s, L9 S
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8 R) `( g+ Y7 Y' C speed ;; the speed of the turtle Q- W* i$ r3 [( {/ D: |/ j
up-car? ;; true if the turtle moves downwards and false if it moves to the right
% l- ^3 Q% @2 Q# v* g$ h/ {. E wait-time ;; the amount of time since the last time a turtle has moved! V# N/ A# k; s. f8 D
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patches-own
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1 t6 h1 g( ^$ @% j% f intersection? ;; true if the patch is at the intersection of two roads
* p9 m, {8 V' c/ e. g green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 e- V2 U- t* {7 D4 H& _+ M
;; false for a non-intersection patches.
0 H) u6 L8 \4 C+ m1 u7 g my-row ;; the row of the intersection counting from the upper left corner of the0 d, L* T8 M/ c( w6 Y0 f
;; world. -1 for non-intersection patches.: p/ e* P( z0 Y$ x9 P
my-column ;; the column of the intersection counting from the upper left corner of the0 |4 `; I, S% q! W k* x4 Z6 n; z
;; world. -1 for non-intersection patches.
8 f9 m. L- s _- ^1 |3 [0 ^ my-phase ;; the phase for the intersection. -1 for non-intersection patches.0 M7 L: F3 j2 x* ]: D! j* S( H( `
auto? ;; whether or not this intersection will switch automatically.+ A1 p, c5 @1 k3 c3 X
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;; Z& l( g/ M$ M$ |/ x! y
;; Setup Procedures ;;
' s0 y4 v8 V8 }( V5 ~;;;;;;;;;;;;;;;;;;;;;;
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/ Q2 D& @( D. \# K O3 G9 z;; Initialize the display by giving the global and patch variables initial values.
9 Y [" m: _6 Q1 F! @( a9 d* };; Create num-cars of turtles if there are enough road patches for one turtle to! }3 o3 I0 a( L2 U* \+ c1 o$ U
;; be created per road patch. Set up the plots.
; c F V! U8 H+ W9 _: K( Pto setup
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$ b, V [( M2 d0 k7 p setup-globals& e# x& |- X5 X
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;; First we ask the patches to draw themselves and set up a few variables
) [3 G3 E# W4 D5 Z setup-patches
: z' E5 }; R* E( @& z$ ` make-current one-of intersections$ y5 R/ K& F' s. B; \/ m* s
label-current
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set-default-shape turtles "car": R) S/ O8 }' T1 X" x
1 S) c! F3 y- J+ } C$ W if (num-cars > count roads)7 H3 y8 p7 G! c+ }4 \
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! k- o! v* ^/ I3 F' x user-message (word "There are too many cars for the amount of "& n, T, w4 C( j8 }8 n* F$ d& \( I
"road. Either increase the amount of roads "- b3 Y9 b% y% S @! T" ~2 Z; C
"by increasing the GRID-SIZE-X or "
& @, o, `' E' s3 w( c" o! q% f "GRID-SIZE-Y sliders, or decrease the "
- g, a& T2 `+ ~/ g) T "number of cars by lowering the NUMBER slider.\n"
, n+ v" G9 M# b) P5 T; K0 t' h( y "The setup has stopped.")
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4 X$ Q; O7 P; R! c( {! R ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 u9 Y# B6 T. V4 w1 l
crt num-cars
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! z0 ^' y% u2 X# U: F9 t2 V setup-cars
- g, f8 Y* h4 H set-car-color
) i: w- R9 v8 J n7 v5 C7 ~ record-data
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;; give the turtles an initial speed* w' u& n! E: ]3 [4 }
ask turtles [ set-car-speed ]9 ]2 m6 x; J/ m2 q
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reset-ticks
% N6 ^, G+ D/ X7 fend
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;; Initialize the global variables to appropriate values
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: A, ?& d/ J. V3 i: l9 |- X6 H5 y set current-light nobody ;; just for now, since there are no lights yet
9 S6 C7 e, ]+ E7 l7 v' y set phase 0+ q5 @7 k5 w3 ?; A7 j/ A
set num-cars-stopped 0" ~( h( q; |7 q# f# i5 j8 i$ E) _
set grid-x-inc world-width / grid-size-x
5 B e# L% d# N; V( F1 d9 l8 G% @3 N set grid-y-inc world-height / grid-size-y& A L) M( N9 }8 S- s
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 v1 W2 c5 ^5 ~& m* j/ S
set acceleration 0.099
: G3 i9 M0 w7 O8 ?- n% o; W; g) n- Uend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 y8 N+ ^' q+ V' a2 A
;; and initialize the traffic lights to one setting* B$ s* J" u0 o% n0 l
to setup-patches4 g5 Q: o$ S/ O* M# B2 j
;; initialize the patch-owned variables and color the patches to a base-color
_. o) v F9 C+ V3 ~3 N- z ask patches. h, q# @" S( R" l5 G, {& x
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, g( O1 R W$ L& `* m9 Y: e& x9 R set intersection? false. @0 j: c/ r. w, P. U& t
set auto? false- z$ n/ Y$ \6 H4 G
set green-light-up? true9 Q$ w( k: t; E2 o0 v
set my-row -1
+ A Z, {. v+ i6 K: L set my-column -1
7 h& e# \) T" y' G9 N T: k set my-phase -1
- g- |6 }2 B3 ~1 c |8 |3 X set pcolor brown + 3
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; x) W2 p1 R$ P/ [' @ ;; initialize the global variables that hold patch agentsets/ o) Y* Q$ }2 \: E$ S5 D
set roads patches with
( ^3 a$ x2 U" F. q5 `0 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# Y! j( _3 f0 O) _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) Z, ~3 b+ Q, R. G
set intersections roads with) b/ C3 N0 R! m# L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' f( }: k3 [. c) x5 U* i% P# _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. m( Q) c6 O U% k
8 c( { |% f9 o) q8 z; r- S3 P ask roads [ set pcolor white ]
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. `( Q: {1 S7 v% N% c J其中定义道路的句子,如下所示,是什么意思啊?9 E$ S+ I0 w0 r9 w5 n
set roads patches with$ X* w* D8 ]+ r ?/ p1 a3 x3 C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# `( K7 s9 X) g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 t) o4 M' C$ C/ q! _9 ], M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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