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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。
$ T- X5 ^- D& {# z( Pnetlogo自带的social science--traffic grid这一例子当中,: H. a" k8 s, y. x2 W, |* Q
globals0 u- t+ T9 O" |* |8 f3 Z
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grid-x-inc ;; the amount of patches in between two roads in the x direction+ d& p! a- c- ?" T5 @2 ]+ N* K
grid-y-inc ;; the amount of patches in between two roads in the y direction ^: i' d* }, b
acceleration ;; the constant that controls how much a car speeds up or slows down by if
" c( M `1 D0 `5 A( `7 W& U6 x ;; it is to accelerate or decelerate0 O0 P* J [7 Y1 X' M l3 F
phase ;; keeps track of the phase
& h# J t1 H& g" `% O num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; P7 d$ b1 I8 G7 T6 f8 @: Y; D current-light ;; the currently selected light! d4 {- m, _( r$ z/ t5 Q
' [; }) y. \! y, ]/ V, s ;; patch agentsets
+ o4 F/ u+ _8 E; l* ?" l2 W1 s intersections ;; agentset containing the patches that are intersections: }/ @% k) L, |4 F1 h# U% w8 {
roads ;; agentset containing the patches that are roads
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4 k( m% N) Z. m9 V# R$ Zturtles-own
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& G; V* o$ \, q0 s! T speed ;; the speed of the turtle
$ F7 ~5 T% l8 U9 u9 ^; F) o, e8 w up-car? ;; true if the turtle moves downwards and false if it moves to the right1 q6 R8 f, W2 {3 r5 \
wait-time ;; the amount of time since the last time a turtle has moved+ H1 C! V. F4 r: h) Y* Y3 M
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patches-own: M9 V; {+ o' a7 N& h) h4 p
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intersection? ;; true if the patch is at the intersection of two roads
2 _ t# m/ H; u" V p green-light-up? ;; true if the green light is above the intersection. otherwise, false.' i% a l2 y( R% I
;; false for a non-intersection patches.
1 y/ s8 @7 e. \6 X3 V my-row ;; the row of the intersection counting from the upper left corner of the
6 f2 K7 C& T9 D# R9 J. m- O. k ;; world. -1 for non-intersection patches.
! F' U+ P( Z& K6 R my-column ;; the column of the intersection counting from the upper left corner of the
6 e9 j7 b/ m: [1 O( k ;; world. -1 for non-intersection patches.
7 a& y$ q! S6 Q" U my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" D7 }3 g: ]" }& p T* i: _& c auto? ;; whether or not this intersection will switch automatically." N3 O5 ]/ H" S' \3 G& \* o
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
5 \7 {# ~ `# w! J6 I# \- k;; Setup Procedures ;;: K6 h- L6 t1 V9 x. c# ]' L4 E6 n: x
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.+ T. _1 \; y9 T$ o, M
;; Create num-cars of turtles if there are enough road patches for one turtle to" e1 T, p8 v8 o u, C' b( k
;; be created per road patch. Set up the plots.+ d% P8 Z$ A. a3 {$ {
to setup
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; M, \; f! p1 X) [ setup-globals% E' `; ?6 f1 ?! a& K
0 v% I9 h7 Y: `7 T% H7 B/ X" k ;; First we ask the patches to draw themselves and set up a few variables
) r; a; s9 K, |+ H( |+ T' @ setup-patches
- T- B" x0 Y: ] g. r# X make-current one-of intersections
( e7 c, P) i( X. e' g label-current6 F7 P% W; l& V( V( W- e* n; |3 q
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set-default-shape turtles "car"7 _2 `5 Y3 j8 q, Q2 l+ u; O
# [& k4 k' p8 ^% g# w7 C if (num-cars > count roads)
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) W' ]+ q: j8 l8 U- V, U) Z user-message (word "There are too many cars for the amount of "
; ~2 D/ X! g: S1 \& e" i; w "road. Either increase the amount of roads "/ D' E0 l w" W
"by increasing the GRID-SIZE-X or "
7 Y+ J3 u; E$ v- F) M4 \4 Z [7 ] "GRID-SIZE-Y sliders, or decrease the "
+ k# }8 O) T v) c2 r "number of cars by lowering the NUMBER slider.\n"2 a9 Y: W2 I" T8 Y& i/ K
"The setup has stopped.")
, e0 V( g8 v& L8 z# { stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" e! {- L/ C; x1 l3 I
crt num-cars7 w0 h% k* H! Y& ~
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5 U1 e* z! g6 a( K* S; q4 ` setup-cars0 ^. C& q V! f& N. x9 q0 X4 W
set-car-color
8 j6 z! x. n( v( ~' J record-data
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' Q: }6 T! U& |0 q0 i ;; give the turtles an initial speed3 b- ^, N7 j2 _* i
ask turtles [ set-car-speed ]
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reset-ticks
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1 f% _" I X/ ]) b1 I4 U7 g |;; Initialize the global variables to appropriate values
: l3 t* ^; L; W6 Kto setup-globals7 F* ]% J; Y4 h* w: L7 N
set current-light nobody ;; just for now, since there are no lights yet
4 k7 W& f. y/ Y) F! _- N+ g3 P set phase 09 L4 f& I' d8 j
set num-cars-stopped 0
! T l% d5 M" q! m4 l6 G set grid-x-inc world-width / grid-size-x+ y9 B8 K" M( j1 a g
set grid-y-inc world-height / grid-size-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
0 u9 {$ l2 h1 k# ]; B set acceleration 0.0993 Z# i) d7 N2 m4 F2 \( K6 Q/ p8 S
end8 ~. p3 M% `$ d
9 N/ z+ y0 p; l) }# G5 a;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 `7 g; s5 l4 g" t
;; and initialize the traffic lights to one setting% F3 P! z3 J; R3 h( b
to setup-patches
: o/ G! Y2 H. V. g4 q: ^3 ]( p) [ ;; initialize the patch-owned variables and color the patches to a base-color% c& K$ y, g2 s$ U1 f! |& e
ask patches
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set intersection? false, N7 M! T8 A; M. A$ `
set auto? false! i9 y2 K) N7 Q
set green-light-up? true
) @/ S! }* I( ~% n9 f/ a2 E ? set my-row -1
' Q( t3 Q# a8 |5 [$ g set my-column -1
5 N* B/ f$ x/ J7 T8 G set my-phase -1( ?" ~7 k" t2 S& R; }
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets7 K# G9 v/ a$ ~, [; B0 D
set roads patches with
5 |: q- g. k0 z) X% }/ J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, B' O: p# T/ M- m9 o4 m# |& F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. Y4 o8 [, u$ r% k set intersections roads with) I! ~! z! {5 w% [- K$ h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 X; h9 O& v# q, F! C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 {' H* b$ [8 V) r
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?3 P- L- Q5 c' I) V! X: [
set roads patches with$ g/ E/ p9 I) F3 r) ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 J( B, C( l3 P- {, X b' e6 W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 n5 X" V7 z8 O, q0 B8 c, 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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