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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 l. z: p) w a6 fnetlogo自带的social science--traffic grid这一例子当中,/ {$ m w6 [0 t" I* ^
globals; h+ \7 E' g2 {# c% a
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1 d% o/ _ Z& e: v grid-x-inc ;; the amount of patches in between two roads in the x direction
6 b/ a ^+ ], e. M& | O2 Q grid-y-inc ;; the amount of patches in between two roads in the y direction
4 ?+ \. y- L$ y acceleration ;; the constant that controls how much a car speeds up or slows down by if7 V |# G; X% ?
;; it is to accelerate or decelerate u6 f3 K7 s* J0 M1 J
phase ;; keeps track of the phase
6 ?& {+ z0 O" [: N+ l- k# b num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 E V# y7 D8 b& L current-light ;; the currently selected light
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% a! I- K# ^( L& ^5 v3 A: N ;; patch agentsets
* h$ e+ {+ D- t intersections ;; agentset containing the patches that are intersections' c& v# b% V* b+ @, p; u
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
( Y. [% L$ O" L/ K& J% I. u5 k up-car? ;; true if the turtle moves downwards and false if it moves to the right
& [" P$ Y; S% g+ ]2 z wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads, K4 w3 y' b, G' b4 l" K( a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
; V1 @0 y7 w8 q( D/ A1 o5 Z ;; false for a non-intersection patches.
2 w% k9 w/ I: j" Y y" c. E7 X my-row ;; the row of the intersection counting from the upper left corner of the
2 a8 M2 s4 g! I% H2 P0 q% N7 ?8 f9 O ;; world. -1 for non-intersection patches.
- y: o4 k* o/ ~ K& ?3 I my-column ;; the column of the intersection counting from the upper left corner of the# o: [' ~: w& X
;; world. -1 for non-intersection patches.
$ k" ^5 i% @( m% G& f# A8 i7 Q- _. R my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( w+ W% c9 e8 C# a$ W7 Y+ B- [ auto? ;; whether or not this intersection will switch automatically.
& i( k5 b- g/ l3 Z" x; u ;; false for non-intersection patches.
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9 j$ X; ~: U# `" ^% q, x- s4 i0 Q;;;;;;;;;;;;;;;;;;;;;;
1 g, ]+ q; l* Y; p! T% q3 ^;; Setup Procedures ;;% R; W7 S! T. _ c
;;;;;;;;;;;;;;;;;;;;;;
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4 Z0 E, M0 r# J( h& f: w. X; t. N;; Initialize the display by giving the global and patch variables initial values.
% O8 Z! l) H; Y) |# g, n;; Create num-cars of turtles if there are enough road patches for one turtle to
* M5 ]% j/ \0 l; a+ k;; be created per road patch. Set up the plots.4 k3 Q4 N9 b% o# b& K: K, \; M
to setup
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2 Z. T0 F( \" a! b" F setup-globals0 M4 W9 j2 H: L
2 S0 b" D/ D4 U- ]+ K( W! x+ t ;; First we ask the patches to draw themselves and set up a few variables3 P- v" T; p. G# e
setup-patches
" |6 g* F' E) T$ ~& V2 d make-current one-of intersections
* c% q% B1 T: A- Y3 s2 A- P label-current
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% U$ |. ]+ S ~! Y: }1 G" j0 v set-default-shape turtles "car"
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if (num-cars > count roads), Z! U4 a8 L* Q8 p5 F
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user-message (word "There are too many cars for the amount of "
. V u" J$ Z1 q1 ` s "road. Either increase the amount of roads ") ~8 F, U% [5 ^; Y
"by increasing the GRID-SIZE-X or "
9 |! K* ~2 Y7 L& c3 q. |$ m. \ "GRID-SIZE-Y sliders, or decrease the "3 F. f8 V. t3 D {- P0 D
"number of cars by lowering the NUMBER slider.\n"4 F: e1 e5 l0 Y! O, z* Y
"The setup has stopped.")) u+ |9 ?/ C$ y' A' W
stop
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" E9 S9 f' | {; A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 b1 o% V$ G% X7 J3 V' H0 | crt num-cars- s/ E- B0 _8 d( X7 a4 j4 I( ^
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setup-cars9 W4 W. {+ x/ P" J4 H4 X
set-car-color9 c6 D3 E" n% p9 M9 k! I
record-data
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5 [+ s& `0 @* K/ s ;; give the turtles an initial speed0 F0 l6 s9 z* o: n
ask turtles [ set-car-speed ]
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. I, h' k, l9 p* Q) Z reset-ticks% d8 \/ ?6 d- p3 C8 R
end
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;; Initialize the global variables to appropriate values
# g+ a6 n$ m% t; \to setup-globals7 u/ J# M1 |) G
set current-light nobody ;; just for now, since there are no lights yet
. J7 N& _1 R4 D. ^3 U) W set phase 0
; O* Z9 v3 G( M9 q set num-cars-stopped 0
/ R" ~$ K+ @1 d9 r$ i5 [ a: Q set grid-x-inc world-width / grid-size-x
9 |/ K# N2 x. b9 |; } set grid-y-inc world-height / grid-size-y
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+ k% M, @3 X1 T& T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ E4 b* {8 h$ D+ _4 ?' U' y# @2 H3 e set acceleration 0.099
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1 U9 [. h+ `& T- S# n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
K% g3 e) ^ H5 ]; A5 Y1 c;; and initialize the traffic lights to one setting
) X; M/ @/ f' N9 O: B) _" `to setup-patches, |& m7 o. Y: w: r
;; initialize the patch-owned variables and color the patches to a base-color5 |$ |4 C" F7 m Y9 h" D4 ^6 J9 L
ask patches
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set intersection? false
( G5 f |! I4 ^5 f' F0 V set auto? false
7 V" i1 n3 h. M+ h set green-light-up? true4 q* y; }1 u; m; v
set my-row -1
2 B; Y* q7 l& s4 _ R4 c, \ set my-column -1
' m) q$ g; Z* R+ V( C set my-phase -1) y( c/ p: ^9 l
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
9 X! r6 ^7 l: o* ] set roads patches with
! D$ L) i2 x4 i5 z/ m( { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 g; A8 J* X: O3 q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 f1 F0 y7 V- L' |4 P! x) ?- R set intersections roads with: P0 t2 V- D' u, J- P* i, H3 K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( [( {* B3 _1 f; F$ A# f0 U6 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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/ c' Y, c6 }7 ], l+ I+ @9 Q ask roads [ set pcolor white ]
/ @7 T U9 Z2 p1 {5 E5 H setup-intersections
- k. g+ g: e' ~end
/ t: x! c. a7 ?其中定义道路的句子,如下所示,是什么意思啊?6 w8 X+ k. j2 ^3 G" l k8 N2 ` \
set roads patches with4 {2 o& E- t8 s" O3 G* t! r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ j: K2 P* ^" l6 d+ V8 P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 e% g6 v0 D$ k0 |! B t- Z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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