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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。% ?$ f& Z8 G9 T7 M6 K* @
netlogo自带的social science--traffic grid这一例子当中,4 ]# t1 \& g) H) P! v: N* Q
globals4 m) f' `1 @; I) O2 p) m' U
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' H; Q! f7 w; y! t2 r! ]% G4 r grid-x-inc ;; the amount of patches in between two roads in the x direction
9 m/ t2 ~. Q; h% h grid-y-inc ;; the amount of patches in between two roads in the y direction. h% D4 T8 e0 m; |$ n& I; E
acceleration ;; the constant that controls how much a car speeds up or slows down by if
# O U( C! K# H( r9 O( Q9 q ;; it is to accelerate or decelerate
0 c1 O3 u$ d5 O2 `' y/ [6 S phase ;; keeps track of the phase5 k$ I6 }. \! z" x8 u! A
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 t) Q U f5 \& J
current-light ;; the currently selected light
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;; patch agentsets7 G# M1 m5 w1 v& t# S! A& c. w8 `
intersections ;; agentset containing the patches that are intersections
+ v0 [( ?" t1 C* @. M1 B roads ;; agentset containing the patches that are roads
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turtles-own
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7 [% U7 I* g ~5 O' G speed ;; the speed of the turtle5 w& N8 i# T- E9 g9 P
up-car? ;; true if the turtle moves downwards and false if it moves to the right
! R! {: ]7 ^$ _7 V8 u$ G8 f& |9 t wait-time ;; the amount of time since the last time a turtle has moved
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% l0 U7 w( W1 {; jpatches-own
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$ J5 J8 a" x1 i4 X intersection? ;; true if the patch is at the intersection of two roads! q z* e" m5 k* Y, M2 h
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& E0 F8 |; M0 U& M/ `# j5 Z ;; false for a non-intersection patches.
+ b1 i) y# m4 i my-row ;; the row of the intersection counting from the upper left corner of the9 H' y- F# c! P9 v" Q* o2 G! M
;; world. -1 for non-intersection patches.! D6 Q; E3 ]/ H# U6 o. R/ _- u
my-column ;; the column of the intersection counting from the upper left corner of the
, N/ K! L) B4 p/ q ;; world. -1 for non-intersection patches.
H: g1 @0 A: g+ r4 F) I3 Q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 v+ p# ?( c2 i8 u7 K$ k7 B9 ]7 K auto? ;; whether or not this intersection will switch automatically.7 e7 F6 c4 \1 d+ l0 C u% A p
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;' P4 A) L2 ^, ~2 c1 F* P( E6 Q
;; Setup Procedures ;;! f& N0 N8 c; r4 z' R* y
;;;;;;;;;;;;;;;;;;;;;;2 A: x3 V; Z) M- c" K
4 b9 T2 S* ?5 z7 p" v. };; Initialize the display by giving the global and patch variables initial values./ O7 c1 D" s/ u! m
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 M: d" s* j% e/ f;; be created per road patch. Set up the plots.
, i2 ~* r" c- a+ f' M! D/ A# d) xto setup3 F# l8 i& Y" i$ y% h
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables2 G6 r! U1 K! `/ I
setup-patches
2 R; V. q3 n9 [ make-current one-of intersections
$ s& B( J) T1 ]$ w( V2 S3 Z label-current
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5 C( a, {% [2 Q* C% L3 H set-default-shape turtles "car"
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4 `4 m) P9 P# x. {, R if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ". U3 U8 y/ I: l
"road. Either increase the amount of roads "& ]6 k' g& K& P2 A* n* v
"by increasing the GRID-SIZE-X or "
0 r; w m4 A/ \' N% m "GRID-SIZE-Y sliders, or decrease the "! ~1 k- I% _6 h4 r* M
"number of cars by lowering the NUMBER slider.\n"7 \: g/ Z( x1 ?! p
"The setup has stopped."); f6 v' \5 t% z# B& G
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# }* W' O. ~" T% ]- F! D5 V* a+ d
crt num-cars) f% {; M9 o8 f4 R B) s6 v
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setup-cars1 F# a: l7 c; [$ d" K' K
set-car-color
. }- v' h( H( a! ?1 w record-data
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;; give the turtles an initial speed8 B! Q! ^% c- t2 n# I9 M: O6 t0 ?5 E( J
ask turtles [ set-car-speed ]
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reset-ticks( I( ]) U7 Y2 F# h x
end5 c& o. h1 N3 Z# F
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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
( |" {4 L' p( {4 { set phase 0/ Q( J& r/ }$ }' E) z9 c
set num-cars-stopped 0+ Q5 @$ ^+ n3 F
set grid-x-inc world-width / grid-size-x
' H* D* z5 ?. i3 | set grid-y-inc world-height / grid-size-y" A9 k0 M3 y. a3 t; L+ B
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ h _ N) v4 f1 [$ i
set acceleration 0.099
9 }% K! S v6 Iend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. e, ^6 O9 T% l* I, s& @
;; and initialize the traffic lights to one setting
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;; initialize the patch-owned variables and color the patches to a base-color
8 r) ]* @2 ^% Z( {. I6 B ask patches
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set intersection? false, U6 a6 e5 H9 k* S$ C$ b; D
set auto? false
# ~# A% a7 k2 I5 m& F8 D( R set green-light-up? true0 J( i- g' \/ g. }( W
set my-row -1
0 H7 U' |" P: p5 N7 q4 V. I n. Y set my-column -1
1 n9 {, r; ?" o7 i5 E; J$ Z& A/ F set my-phase -1
7 i0 L2 [8 V, ]. z9 ` set pcolor brown + 34 H; C; w- b& f% m0 N
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;; initialize the global variables that hold patch agentsets' F. c; G* [$ ^! [# y8 |% D" f1 }
set roads patches with
' V) A1 N1 F% b* {4 w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 K& `+ d: s% h' ^ f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 `8 C( r, }4 ?7 d2 Y' S8 o
set intersections roads with% ] e0 r# ^9 S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 c1 f3 ?1 _" E/ h6 _: W; B9 N (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]9 @; {6 g& S' h F; f- l6 Y7 O
setup-intersections, G3 {2 h' ]) R' H( Y$ r
end
4 Z- W( ], I. ~3 ^其中定义道路的句子,如下所示,是什么意思啊?
. ^' i5 C- ?! E5 @' |1 t7 W set roads patches with
. H0 Z3 @- i6 `, g/ ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- k% b3 @! T u3 r1 {6 ?' K$ q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
~( m" H* X2 s' P( X4 s4 B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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