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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。
" i+ N. t3 N1 E( |) C" @: Dnetlogo自带的social science--traffic grid这一例子当中,
8 f8 B3 v) R' B/ m, c) o6 sglobals: n" ~( G) Y% r2 u9 f |' q ^
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grid-x-inc ;; the amount of patches in between two roads in the x direction
# ?3 N* Y& ?, ]3 C/ l9 N: H& P9 f grid-y-inc ;; the amount of patches in between two roads in the y direction- r% \- H. x; u) E
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 T0 u' [+ _( p0 ]2 q ;; it is to accelerate or decelerate1 ?7 ?! K5 d9 d1 k- R
phase ;; keeps track of the phase" F0 y7 u% ^- e' b9 ~, a( w
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% t( x4 g/ N8 O: l- [7 u
current-light ;; the currently selected light
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8 M- F' K8 f3 E/ ]. `$ J* j( _1 s ;; patch agentsets
* z5 v" z9 A0 Z7 X! m intersections ;; agentset containing the patches that are intersections( `* L8 ?* s3 p) C2 ]/ U5 _9 G6 {
roads ;; agentset containing the patches that are roads; y* [' Y% J. ? ?7 M# `3 R2 V/ E
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5 u) {5 h. S6 S0 V! G+ i) uturtles-own
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$ x' |8 x: c/ V speed ;; the speed of the turtle5 N8 H; u; l4 I( B C) t
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 k# Q8 H3 P; \5 e# g; R; b& z
wait-time ;; the amount of time since the last time a turtle has moved# A: ~5 z8 Z3 {- O% G; x" l
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patches-own: e3 n1 C( F9 ^; f+ D
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' C' W2 C: y# e: w intersection? ;; true if the patch is at the intersection of two roads
+ X) d! Q) m* m, _3 ?! n7 N green-light-up? ;; true if the green light is above the intersection. otherwise, false.0 P- r- t$ o3 q& ~9 U5 s
;; false for a non-intersection patches.
3 x3 w3 F( U p9 F' I my-row ;; the row of the intersection counting from the upper left corner of the
" Y7 ^8 @9 t; Q4 ^7 r+ P9 Y$ [2 }0 U ;; world. -1 for non-intersection patches.
) t- ]! {. U% C) w! V6 ^' M& T+ L my-column ;; the column of the intersection counting from the upper left corner of the
+ }3 A' u1 Q. l; g+ {; w- s ;; world. -1 for non-intersection patches.; L4 b. O: Y5 R# p. F; r
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. n) s5 o. N4 Y$ K auto? ;; whether or not this intersection will switch automatically. V0 K& _. ^4 K
;; false for non-intersection patches.: k, I6 T* @; Y8 ]+ ^, k& `
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;;;;;;;;;;;;;;;;;;;;;;) I, R$ k% K( l3 N- T7 W
;; Setup Procedures ;;/ m; U( W% \+ L, L1 L
;;;;;;;;;;;;;;;;;;;;;;! ?: Y; X( z g# C! O L" i
1 b9 I) q. D# _6 \% C;; Initialize the display by giving the global and patch variables initial values. `9 s1 ]8 J" { ^$ p- l5 n" a
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 i" ~: n, S0 d% f; `) O% p;; be created per road patch. Set up the plots.
% q5 Y3 a, Q8 G8 O. |to setup4 C# q% S* D: f1 f
ca: }9 j; h' t7 d* _2 A; x
setup-globals: p4 w9 Q; d3 a) l! V
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;; First we ask the patches to draw themselves and set up a few variables( n9 O3 O: j* X2 ^3 a6 w5 ]
setup-patches
$ m/ Z8 R4 a% v3 ^% g make-current one-of intersections4 u& P! B3 _. L$ E0 e
label-current% m6 m3 X' f% u
/ ^. t3 z7 W/ D& v& }8 t set-default-shape turtles "car"1 O3 j. k! L7 y* ?% ~5 Y
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if (num-cars > count roads)9 e1 g' G- \8 l! i, s5 p
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user-message (word "There are too many cars for the amount of "
6 Z' ?' P3 s8 _7 Z$ m( ~! w "road. Either increase the amount of roads "" Q7 w7 G7 \% G3 S1 s. Q, J1 u
"by increasing the GRID-SIZE-X or "
A+ j3 A6 Q2 c; S "GRID-SIZE-Y sliders, or decrease the "
' s8 [) ^2 R$ `; g2 ~ "number of cars by lowering the NUMBER slider.\n"
+ U: y0 `# k1 C/ l1 O% O5 S "The setup has stopped.")! J j, S9 }" p2 K3 |. c) e
stop
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. U7 P1 u2 a8 [- a ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- [/ F) u- h" V" U0 J# A crt num-cars
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setup-cars8 D# D/ u$ x* e ?4 }
set-car-color
- n# o) h, D; J, |4 X record-data; Y8 @1 R5 g' i) t
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;; give the turtles an initial speed
* O% V5 d" h. i0 A7 [ ask turtles [ set-car-speed ]
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( m+ I8 {! E% ` ?. H3 z reset-ticks, a, B0 e) o) \' S
end# x% K) f$ K' d/ `3 q2 W) }
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;; Initialize the global variables to appropriate values
7 K L% Y! C# {) Q0 X4 o' ?to setup-globals
% u4 U( o* m2 q; y set current-light nobody ;; just for now, since there are no lights yet. A1 Z& c8 ^; v
set phase 0- ]9 a1 Z% K5 l, T# y
set num-cars-stopped 0
# c% ?) T0 q- Z2 Q set grid-x-inc world-width / grid-size-x: M3 C. J% o1 a' n6 W! [
set grid-y-inc world-height / grid-size-y3 R! D4 _+ E% R' t Y2 {- W
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; T1 U$ {# m" s: j7 O, P set acceleration 0.099* p) _1 T1 D) e9 M& G
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 `* i* L, r1 M2 r W;; and initialize the traffic lights to one setting
& \/ P1 M6 o3 M$ ]! ito setup-patches
1 `6 A" x$ d) i7 y, u ;; initialize the patch-owned variables and color the patches to a base-color
! J @4 Z0 X; {2 N5 b+ U ask patches2 c" |7 j' {3 O7 \+ y( g' B) J% S
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7 K1 i9 z7 k( J0 j$ f0 s8 V# J set intersection? false% ~$ X& K' N2 e- F3 q
set auto? false
* H2 l4 _# V- T set green-light-up? true
1 c9 c6 b" _! U- g" | set my-row -1
6 b, [ B n2 {# O set my-column -1
& } F9 T* q; v9 A: B6 k: W set my-phase -1
/ ?4 E9 W' t& x7 O1 ]+ @2 | r set pcolor brown + 3
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0 N; u9 c( n5 G8 a0 U ;; initialize the global variables that hold patch agentsets
5 N7 l/ ~- F Q. E& W( o+ L set roads patches with
$ ]0 |; n9 r/ [& r) i- r; K [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 |; a; d2 K! E$ M, L, F$ H+ j* \) J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 k2 h4 i+ [( k* H- {9 ^2 h) r set intersections roads with( o% U$ Y4 z6 d) e/ [! Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and8 u- B* r6 V9 s0 U# F0 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! Z, [6 |. d! m! D' z" J ask roads [ set pcolor white ]; g. X8 ^$ H7 p" ?" g2 h- z
setup-intersections% t; }# i4 b: z' I1 Y9 U
end
' u/ ]# L- `2 E, X; x2 s其中定义道路的句子,如下所示,是什么意思啊?
; V a8 P# J2 x set roads patches with
' G: A4 i' Q& c2 K# | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, X( C3 I5 M/ f) p/ \6 b" V( y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) h" S* E. F1 o, P! f! v; s" Y
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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