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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。6 ?$ t( J7 d1 w: P
netlogo自带的social science--traffic grid这一例子当中,
3 A1 s5 I& q/ K- N4 [8 W1 w9 f p; Kglobals2 _. i& X- f5 ~( @3 l4 n
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 L, [3 T: t" e9 q) t& T
grid-y-inc ;; the amount of patches in between two roads in the y direction' S/ ?- {) S2 q# @; T% _* j
acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 X* q. X: S" w$ { ;; it is to accelerate or decelerate
* i/ D* H8 D* o9 Z phase ;; keeps track of the phase
! V5 M" [6 y* P0 V; @: s num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: V5 @1 U1 l, @3 K/ m
current-light ;; the currently selected light+ e9 r% p9 W# e
! C- `; W% @9 O3 ?7 n# B ;; patch agentsets
* S$ U: B( o7 X; c5 F" w intersections ;; agentset containing the patches that are intersections3 g& n' ~9 \6 C6 p
roads ;; agentset containing the patches that are roads) L8 p% P/ G0 E) a5 G: I
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3 p, ]' X: a* _( _5 ]+ G! mturtles-own
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speed ;; the speed of the turtle
& Z) u3 m& z4 u0 n; }. v, a up-car? ;; true if the turtle moves downwards and false if it moves to the right- p% M+ X+ @. ^; i/ j' g
wait-time ;; the amount of time since the last time a turtle has moved8 A8 x2 a$ T6 ~* F; ~; z5 N
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7 ^, D, `9 z. v, Q# J/ ]patches-own
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intersection? ;; true if the patch is at the intersection of two roads6 P7 E( X9 l! v s" }5 b2 ]3 i
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, e0 U T$ _: r- W& q ;; false for a non-intersection patches.# M7 Q- t( O9 y6 b, u- b
my-row ;; the row of the intersection counting from the upper left corner of the2 \7 g$ j x5 J j, A
;; world. -1 for non-intersection patches.; t! H( _, q: I& I3 J5 K% ^
my-column ;; the column of the intersection counting from the upper left corner of the
) O v; w; N/ a ~ ;; world. -1 for non-intersection patches.
6 d7 f* N0 P% b my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 m' ]8 i) B* _) A- {; a* E1 G/ D
auto? ;; whether or not this intersection will switch automatically.
( t# Z2 z2 b3 Y ;; false for non-intersection patches.- C% S1 a2 ^/ g1 F" H1 e1 X
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;;;;;;;;;;;;;;;;;;;;;;
# X1 R, o6 \/ R;; Setup Procedures ;; a6 S; V7 b. g2 ] L/ a$ m
;;;;;;;;;;;;;;;;;;;;;;: I# I8 O6 E7 A( i
7 D. q3 ^; v4 l1 G; @5 j+ N;; Initialize the display by giving the global and patch variables initial values.
9 s7 `- \: t- t0 E;; Create num-cars of turtles if there are enough road patches for one turtle to
+ n' J* Z+ \! Y3 _: ?7 g;; be created per road patch. Set up the plots.) d7 v* o5 F4 x$ B. `
to setup* U: g: W8 T5 H5 c
ca
$ o o: y% j1 _7 S+ \0 \- i# t setup-globals S( ~/ T- h7 X; H. c* K
) o( ]' R* y; g( V2 J- i9 ^+ R& g ;; First we ask the patches to draw themselves and set up a few variables& V8 `# ]0 W3 I2 Z; r7 J! E
setup-patches
$ G, u3 n& K1 J& b make-current one-of intersections
5 ^' n; p* N# v% v7 j# Y4 x9 M label-current
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set-default-shape turtles "car"
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( R; ]# D% a2 J: v, ]( u2 ]% a7 x* p* l if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
0 q+ ]; M; A: y0 n G6 s0 C "road. Either increase the amount of roads "6 e1 p4 N% T* L% i
"by increasing the GRID-SIZE-X or "# K( }5 ^+ x5 q2 |
"GRID-SIZE-Y sliders, or decrease the "
% @ L% x% ?' e "number of cars by lowering the NUMBER slider.\n"' n" W4 ^% m. m# Y% b( @3 i2 ?
"The setup has stopped.")3 S Y3 V8 Y+ f& ^9 @8 F
stop
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& V: p! z/ Z) ]* Z4 @) t) G E. G9 c ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 d0 ~ b1 ^8 V2 y S; g% P
crt num-cars
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setup-cars
) T' ~* s' \) F! P set-car-color
! Y! H" H2 t# [& b" \! n record-data
" C6 C0 s0 k- g ]
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;; give the turtles an initial speed" F3 k& q6 B# w+ W& p
ask turtles [ set-car-speed ]
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w9 ^: h, C" ]6 `8 \ reset-ticks1 a& ]0 G: v% ~0 H, H1 ~) Q Q) O4 H
end0 |- _/ W9 N* L5 i0 [ G
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;; Initialize the global variables to appropriate values8 _* |+ y% N; g/ A
to setup-globals4 N* a' H% D# J6 ]4 l+ j$ H% y0 K
set current-light nobody ;; just for now, since there are no lights yet! N" N4 H( E) b
set phase 0( Z E- u! L! ^) Y
set num-cars-stopped 0! | q" v3 s9 [# G8 n. r, @# P
set grid-x-inc world-width / grid-size-x
- ]& R& D5 s2 E set grid-y-inc world-height / grid-size-y9 Q t3 P/ d* G
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& F9 u0 M' f6 W- G; N; z- D set acceleration 0.099, ?$ G8 @5 P; V6 g
end
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& ^: e5 _% c$ D0 }" r% y4 k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; O4 G8 {3 Q# i* G8 `" H) f% s# |
;; and initialize the traffic lights to one setting
1 z: V7 t* Y& x* y0 E* Zto setup-patches. d* m Z3 k5 Z* v/ `' D
;; initialize the patch-owned variables and color the patches to a base-color' _* X# c: X1 ^
ask patches# L D l- P- \: [6 z& Z
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/ W# X5 i0 y& t) j- C set intersection? false m( G/ j3 ?3 T E* ?% K+ p3 [
set auto? false
; u5 ]( u, e3 e/ H, L) p set green-light-up? true
2 }# K* Z) N) P/ ^8 e set my-row -1) J: h. C2 ^& k/ O' Y5 J2 L4 v
set my-column -1) p/ [* g' S d0 U+ n9 c* t
set my-phase -1. w- t7 @$ L- O2 C* x: l' [! h
set pcolor brown + 3$ V! _8 q. P+ }9 h
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;; initialize the global variables that hold patch agentsets' }) e. n! x- R5 c* x
set roads patches with1 W2 @# h" \$ u e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 A+ e% X& ` A' L# B! J( t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- K) q* T- V' y0 O G* T- `
set intersections roads with
3 T( m. R5 e6 O: g- v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, p" m, D0 U$ o4 B1 ~" }' d/ s3 g3 [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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+ m" Z& ^1 y8 i; r7 G ask roads [ set pcolor white ]
- H. f3 P5 [4 }. q. }0 @3 i2 z7 F setup-intersections3 H: \! X) E9 a$ c' S1 M
end3 G* p' `. B8 E' K; K# D% e- P8 f: {
其中定义道路的句子,如下所示,是什么意思啊?
7 ^- Q9 D3 |5 F6 H9 b& I set roads patches with5 V- T! g% h: m1 w" d+ G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ w% l$ r4 A" ~2 e9 O6 J: t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( w |3 ^1 n5 h; ^7 N3 i2 Q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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