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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。
4 p- p7 j0 m; `2 @, o5 Rnetlogo自带的social science--traffic grid这一例子当中, i6 z: Z# m4 N- Q! W
globals
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: A8 P( w& G1 `& ?! t5 p grid-x-inc ;; the amount of patches in between two roads in the x direction
, b! q. \( B& q8 d+ o! c grid-y-inc ;; the amount of patches in between two roads in the y direction0 z" R- A! n- d- p+ ~
acceleration ;; the constant that controls how much a car speeds up or slows down by if3 S, Y8 F% C4 @: w
;; it is to accelerate or decelerate( K5 P2 C1 @5 Q$ l0 N9 d$ E# Q
phase ;; keeps track of the phase) R6 Y1 z3 j9 h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, p5 R h2 o4 \) A0 K' y
current-light ;; the currently selected light& Z8 r6 d, f) t4 o- d5 w3 b' Y
/ S3 Y4 K" o3 L6 I: V! x$ q ;; patch agentsets r6 I5 T7 i) }) |2 b/ F5 ~3 w
intersections ;; agentset containing the patches that are intersections
2 [# \7 C' i) ~# ?* |# i roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle1 {& P% [7 O. `. ^; c1 u1 _/ }
up-car? ;; true if the turtle moves downwards and false if it moves to the right% @* X% @/ g# l: s( s0 c. ?, R
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 roads1 ]1 P0 b( A) s3 z" m% c
green-light-up? ;; true if the green light is above the intersection. otherwise, false.; l: t1 W! \) h5 ^6 ]; {6 @# l# |9 N" Q
;; false for a non-intersection patches.( Z, T. c- O+ q7 x5 r
my-row ;; the row of the intersection counting from the upper left corner of the
& \: i& q: T; m4 D( |8 Q ;; world. -1 for non-intersection patches.
! s8 q2 h2 ]5 W my-column ;; the column of the intersection counting from the upper left corner of the3 ^. O; w1 D% S
;; world. -1 for non-intersection patches.
) t6 M* M. O W, N3 C' t, w. Y my-phase ;; the phase for the intersection. -1 for non-intersection patches." \. S, z& |. s% |( E
auto? ;; whether or not this intersection will switch automatically." M" T9 f( N$ g" [7 ]2 m
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
R: R9 V3 l3 |) T& H' Q! |;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
0 a( ]2 C$ @5 y4 x8 w# l9 I+ P: A;; Create num-cars of turtles if there are enough road patches for one turtle to) s! \+ Y: @/ a6 P3 r
;; be created per road patch. Set up the plots.: a( e% G$ C4 U* j& y* r
to setup
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% U) U# A2 k# X! j6 _% h setup-globals1 Z( Y& n# s1 e; a9 P) h
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;; First we ask the patches to draw themselves and set up a few variables4 J1 P- a' f V* `5 U
setup-patches; G9 p. p! c/ M1 A1 m
make-current one-of intersections1 u0 p1 V& J: X/ h+ H( r
label-current
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8 e3 S5 B! @/ q) U" F- l set-default-shape turtles "car"
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if (num-cars > count roads)
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5 l W: {/ W5 @, y0 d user-message (word "There are too many cars for the amount of ": b, ]# H6 T# w& l; m, a$ E' }9 X
"road. Either increase the amount of roads "# L7 G) ?. ^1 X( y" N( v1 C9 G
"by increasing the GRID-SIZE-X or "
5 D* ?, @) d: h9 z6 z f6 [ "GRID-SIZE-Y sliders, or decrease the "* U6 g4 D& c/ A2 H: n; t7 o
"number of cars by lowering the NUMBER slider.\n"3 K, }, Q2 T0 ~9 [1 U9 N
"The setup has stopped.")
) Q3 |& |1 N( V8 i5 J4 |, n stop
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7 x' o, @1 Z9 W9 a. ^! E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 ^- f; b5 x3 l2 ?1 B
crt num-cars, H( t5 c8 \* E# t( w& V+ }
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setup-cars. s+ y% d+ m4 X5 @: _
set-car-color
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4 V3 d: C8 S& w ;; give the turtles an initial speed- r9 Y. t- S; K( W8 B
ask turtles [ set-car-speed ]% }9 h. l, @) v( `8 g" @6 g
& k# j. I3 f4 X2 f) }6 W3 y reset-ticks
& B: f5 L% B6 [7 c0 eend
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
9 j3 Q+ k) o) `, a set phase 0
7 j4 C; a# N9 h4 x0 Z set num-cars-stopped 0
! y1 D% a( e5 }* d# H( T2 l, q2 R set grid-x-inc world-width / grid-size-x, Z' R0 k5 P- O8 S
set grid-y-inc world-height / grid-size-y
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) P Z9 J: @/ j# I ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 S( L% z+ |% H
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( W+ ^0 j0 V; `6 _2 |6 g0 E;; and initialize the traffic lights to one setting
4 D2 c0 C! v2 C9 }1 vto setup-patches5 }$ R1 @/ z- S- c% P
;; initialize the patch-owned variables and color the patches to a base-color7 M6 H7 B2 c) f) D" x: }+ q% N
ask patches
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set intersection? false
" G" m! y0 V$ a4 x# e' ` set auto? false; Q4 }: G e% Y4 ]& r
set green-light-up? true; w' F( c% Y( M( w# T
set my-row -1
# ~( Y2 q: r$ W2 y set my-column -1+ Y( V9 W8 c- R k6 z
set my-phase -1* I5 ^- X H7 k
set pcolor brown + 33 b" i/ F! N+ b" N, m# O
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;; initialize the global variables that hold patch agentsets4 O7 F5 M- c1 l( W- d, v9 `
set roads patches with1 p5 e6 @- z/ j: s! u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 [, Z6 @/ @* J0 M# `1 x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) o2 x* b3 N" l, t
set intersections roads with1 W( m! v, t! _7 M5 ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 ?& O; s% f3 h( c, \# A2 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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" Z# a0 ~0 E9 [/ U0 I9 @ ask roads [ set pcolor white ]- u1 P( v: f9 Z" W4 b1 ]
setup-intersections" w& m- Q/ x) L. K, Z/ f0 v9 X8 _
end
8 t% G) B# Y% C' ]6 s+ m5 G3 s其中定义道路的句子,如下所示,是什么意思啊?) u [3 ^, P% X, P; G: D6 i' h
set roads patches with
2 R n) A7 F- S. \! V3 Z W& T5 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( ]* |+ m. m/ H# } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 I: `" u+ {0 ^5 K
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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