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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。
! {. l4 U9 k y$ q1 B% f7 |netlogo自带的social science--traffic grid这一例子当中,# M g. g0 e. [) |& z1 M/ ]- W5 J
globals& K# _7 {0 M/ J+ {5 N" k' [
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1 i" y; D4 m1 t8 Z1 m grid-x-inc ;; the amount of patches in between two roads in the x direction( V* G+ w) ^1 M4 [
grid-y-inc ;; the amount of patches in between two roads in the y direction7 N) T8 E; L! F7 _
acceleration ;; the constant that controls how much a car speeds up or slows down by if- C4 g; G: }5 Q1 B
;; it is to accelerate or decelerate+ ~+ W# @+ e" q/ x, L8 [
phase ;; keeps track of the phase! x; B% l2 o s; B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. n0 R* H5 ?! ~/ L current-light ;; the currently selected light
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;; patch agentsets$ k/ b) B: o8 Z) Y5 b
intersections ;; agentset containing the patches that are intersections1 _8 @5 X. i# ]5 @' L; Z
roads ;; agentset containing the patches that are roads
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$ U# T: {% f, W) i& L9 A' pturtles-own
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( c# _4 {3 ~# r" M/ H c speed ;; the speed of the turtle4 I2 C4 z9 z/ N3 ~* T8 y M
up-car? ;; true if the turtle moves downwards and false if it moves to the right" R5 Y6 M4 a( O9 _
wait-time ;; the amount of time since the last time a turtle has moved
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0 {, {$ x" F' z: n( c# g% a* upatches-own8 D5 t2 |- }$ T y9 [% @
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intersection? ;; true if the patch is at the intersection of two roads
9 }/ v* O7 O+ f% W green-light-up? ;; true if the green light is above the intersection. otherwise, false.
5 e: g) l* @* v3 _! G ;; false for a non-intersection patches.
9 x& ~2 u" ?' y. _; l% g# j) F5 | my-row ;; the row of the intersection counting from the upper left corner of the
) i0 z4 t( |3 g+ M2 a" F ;; world. -1 for non-intersection patches.9 j. N, P7 i3 u; _& x( E
my-column ;; the column of the intersection counting from the upper left corner of the n/ G( ~4 o& J$ q. p/ Y5 f8 g
;; world. -1 for non-intersection patches." b( f" z8 E8 A, p& n; i
my-phase ;; the phase for the intersection. -1 for non-intersection patches.' Y) A% ]" M/ S1 a' z: P9 x, d
auto? ;; whether or not this intersection will switch automatically.+ l3 V# ?8 S0 [3 p+ p& Q- |# m
;; false for non-intersection patches.. |: e; x9 @' j* M+ l: Y
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- {' T2 t4 a4 P+ x( Y# F' n/ };;;;;;;;;;;;;;;;;;;;;;% Y: |. A- l C3 V8 M4 W
;; Setup Procedures ;;: {: c) F& a1 r' ?
;;;;;;;;;;;;;;;;;;;;;;5 _, T( A9 \# M+ M- \& m- Y3 Z4 s
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;; Initialize the display by giving the global and patch variables initial values.
7 L- c( G) P% s$ G0 o;; Create num-cars of turtles if there are enough road patches for one turtle to
: H6 U& {) l! i; ?" j;; be created per road patch. Set up the plots.. l& k4 M& h2 H# B* p# }! c' e
to setup
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* a' K8 S2 {# Y1 Z* P/ u. u setup-globals. U! H2 c$ }4 h8 N/ r, s, C) c" ~. F
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;; First we ask the patches to draw themselves and set up a few variables
4 ] f0 S- w, B' `( Q0 Z setup-patches
8 G* T7 p5 r$ e. {1 D/ { make-current one-of intersections+ C7 w m- \7 W6 D$ V1 U
label-current1 A4 j) Y- g* l9 A9 d
5 w) A& ?6 E) X# E set-default-shape turtles "car"
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9 W' ^( D" z4 G, M5 T9 T( W if (num-cars > count roads)
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2 G; v1 f% E2 f) y6 l4 \# P user-message (word "There are too many cars for the amount of "( O5 K0 q8 x6 i2 t* d
"road. Either increase the amount of roads "
2 @8 y. ]0 v5 \2 S% n4 l "by increasing the GRID-SIZE-X or "
" t+ V4 i; B: S, \. j; ~, L0 @- b" g% c "GRID-SIZE-Y sliders, or decrease the "( P s( X: g$ b; x" v) D
"number of cars by lowering the NUMBER slider.\n"
& ]* h& r: M4 D3 p$ v: z/ v4 N "The setup has stopped.")5 K* K1 X1 B$ s" ^1 \/ u
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' P1 E, }- t1 g crt num-cars1 p% c- z4 g& D) j5 Z$ p3 o! o
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setup-cars
' x! o, t; @' d set-car-color% b" T; P1 u7 l$ V& S
record-data
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;; give the turtles an initial speed
+ J# J, q( m* U3 i6 b( r ask turtles [ set-car-speed ]
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reset-ticks0 b d, U7 T; w6 h# ~9 y
end1 ^" k( q/ U4 I9 g7 y3 @
; d; a1 S) G. P- m: j;; Initialize the global variables to appropriate values; L, m3 O# \: H( S# U9 [
to setup-globals6 g1 P( t3 c2 g2 Q% l4 ?
set current-light nobody ;; just for now, since there are no lights yet( d, [5 x' `' q& q
set phase 0" y9 x6 k. c m! P( i) K* ?
set num-cars-stopped 0
: b% m' i. @2 O! z* ? set grid-x-inc world-width / grid-size-x8 N' A# W, Q" D8 T$ j' B$ S
set grid-y-inc world-height / grid-size-y0 E! V3 ?; {- Y& }7 s& y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ h1 [6 c7 ~. W$ @2 r+ V/ c; j; M set acceleration 0.099! E h: {% K h6 M z+ ^; i- Y
end }: Z Q0 ]; `) ^- ^
# |8 o- o* O1 {/ i+ [3 Y3 f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 a1 B3 h+ ~3 \8 A5 i5 |' }3 f1 r1 k;; and initialize the traffic lights to one setting
" x x9 p4 [# H; h, Cto setup-patches
: D- h4 l" w8 J ;; initialize the patch-owned variables and color the patches to a base-color( s6 h5 v5 B4 }4 t5 e
ask patches& Y" l* x9 X. a) a4 ]
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set intersection? false
7 Z2 x( L+ @) u set auto? false7 L/ e0 R# R, J3 w3 j {' L
set green-light-up? true
0 @% T U& p4 E' U% ]& ~8 C set my-row -1
# S, d2 h- v, P. H' L' k set my-column -1
4 A9 E9 {% ]8 B* s set my-phase -1
+ f" b1 R* `6 m( s; ?9 C. t set pcolor brown + 3- U& }# Z8 n+ o
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4 E5 V( U( w% k! a" i- i ;; initialize the global variables that hold patch agentsets
, W! O( n6 `8 q+ m set roads patches with
; D v. Z3 K* m9 P5 Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( i* m8 S" M" R- W) i2 v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 h* \1 {3 W7 `/ y( Y" s. l
set intersections roads with1 M" P) V9 Y1 H2 S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ e* L$ W, ?# H$ i5 s7 I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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5 V! n& h, y5 e1 Y ask roads [ set pcolor white ]) C4 v; [. j! N* P+ J
setup-intersections6 r- {3 u2 ]2 t, ?
end
- w& |6 ]7 h1 F3 F8 _6 g其中定义道路的句子,如下所示,是什么意思啊?
( J1 v& L# i2 F* Z G set roads patches with; H9 U* j1 |9 y/ \3 T9 U! g: l& c N4 y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 d0 J! s8 j& U0 E2 A" [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 ] |' G" f1 R* b6 Y. A2 }
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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