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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。$ }, ^; Z+ B; U0 X ?1 z/ B" K
netlogo自带的social science--traffic grid这一例子当中,
& L: i& ?8 [* i. V7 X w" U) cglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction- o! X' v; w. i- Q( F/ G
grid-y-inc ;; the amount of patches in between two roads in the y direction0 r( F9 Z& {2 u
acceleration ;; the constant that controls how much a car speeds up or slows down by if3 x! ~- W% Y, x0 q0 g5 ~
;; it is to accelerate or decelerate
- J& U0 p2 m( V& W% c0 z phase ;; keeps track of the phase
4 r! ?" A% W5 @3 h8 S6 ` num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% C! t" B/ u' |2 W/ Q2 u- L) l; f8 P
current-light ;; the currently selected light
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;; patch agentsets
* E1 C, m! p7 V. |3 { intersections ;; agentset containing the patches that are intersections
7 T+ J7 y9 [: b) A' h& P* `% N/ {& | roads ;; agentset containing the patches that are roads8 n4 a* O9 Z" U3 e2 [- L( _0 C( |
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' q9 X3 q! M2 o) ~4 a. c: {turtles-own: l& R, Z1 e+ ~3 _3 f7 e% T
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speed ;; the speed of the turtle. f" W) @8 I; U7 c5 ^& v
up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 [; s6 G9 ~) G7 R- k1 g wait-time ;; the amount of time since the last time a turtle has moved/ X7 t; x7 N4 b: W1 u. m
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patches-own, b. O' S% S3 {: T$ U/ y
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intersection? ;; true if the patch is at the intersection of two roads% D% t: U% `$ j! O% s5 l" O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% @% G0 q" \, b# R ;; false for a non-intersection patches.2 {" n1 h; _9 u9 R" D( \/ R7 }+ X
my-row ;; the row of the intersection counting from the upper left corner of the
# F2 {6 E* V- n4 f8 J ;; world. -1 for non-intersection patches.2 H1 m4 K0 P' D+ {! g6 k5 q" o* V
my-column ;; the column of the intersection counting from the upper left corner of the
/ t$ U! K3 ]' q- r h5 I: K; _ ;; world. -1 for non-intersection patches.
+ R1 W; Y8 ^/ ^" b my-phase ;; the phase for the intersection. -1 for non-intersection patches." Z/ ]* e7 m. ^7 x
auto? ;; whether or not this intersection will switch automatically.
; B1 E: R4 C: v7 g( J( A, \2 H1 g ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;8 `& {1 V* X* e( }
;; Setup Procedures ;;% W$ W: H5 b, n# g% J' O
;;;;;;;;;;;;;;;;;;;;;;
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" M% ?. r2 T9 l, {;; Initialize the display by giving the global and patch variables initial values.
% y; b+ S" h! _& q" |;; Create num-cars of turtles if there are enough road patches for one turtle to1 c, V* ]/ Z1 _( y; a* c
;; be created per road patch. Set up the plots.
7 Z) z7 k* N+ c$ S3 sto setup3 I9 Y( K; S t0 {5 h- N, s7 ?" E! E+ ]
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables/ z' V$ s V" ]
setup-patches; I: {8 C! u, J0 P
make-current one-of intersections
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set-default-shape turtles "car"
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if (num-cars > count roads)* C8 s/ k' x! f
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user-message (word "There are too many cars for the amount of "* g2 y" E( ?0 W: p( d& c& j
"road. Either increase the amount of roads "
( o$ b) \& q7 G- p7 `1 _ "by increasing the GRID-SIZE-X or "
9 B: ~) O# o3 C7 a4 f$ N "GRID-SIZE-Y sliders, or decrease the "
5 t% @8 r {( E4 c% e" v "number of cars by lowering the NUMBER slider.\n"2 w( | Z! z% |3 D
"The setup has stopped.")
; H( N+ @4 G1 |* ]" E. z- U stop
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- v! V6 j0 F' K6 q o9 A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
9 i" Z( j! h4 u1 R. r crt num-cars
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setup-cars& ]7 `/ R6 \! Y" W1 A8 q
set-car-color
% w, K% u: K1 J record-data" x% V8 B8 S/ |: D: n, v0 c4 w
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;; give the turtles an initial speed5 A6 n6 p4 i3 u- o, h" m) \
ask turtles [ set-car-speed ]
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reset-ticks0 d" a8 a1 s9 L, T
end# u0 U# W: s/ i6 Y* F, c
! d O8 q* _+ @- j2 A! D;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet U. w+ x$ n& E1 w! e# p2 @
set phase 0
* F: _ K( g+ A8 U set num-cars-stopped 0$ w' {' D( p+ T
set grid-x-inc world-width / grid-size-x
d2 y8 W, n$ }- d. b5 y) y1 O 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 boundary8 E W+ p$ Q S1 T* s
set acceleration 0.0994 b% a+ m$ c1 V X4 T6 N8 E
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% ]- ~3 j3 c3 A7 D; n2 E: m
;; and initialize the traffic lights to one setting
3 S E5 a5 |9 u- B8 uto setup-patches
3 U* r, d& ^8 \' ^' P2 y! g* C ;; initialize the patch-owned variables and color the patches to a base-color, J4 r' b8 }# m: C7 n
ask patches
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( n! v$ ?1 @8 h8 U% b. B c set intersection? false+ d' L9 w2 o2 q$ D h9 c
set auto? false0 ~8 m" z4 f5 m5 ]
set green-light-up? true
$ H" t. D( j* D8 C' d1 r! W set my-row -15 L% \: X/ ?, t* T% k, W; L
set my-column -1( P4 N L8 w6 ]+ L/ h
set my-phase -16 ^" H3 i( T, ]5 m) @1 s1 X
set pcolor brown + 3( P: d3 g* r& Z
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;; initialize the global variables that hold patch agentsets
' u; E1 a, R9 {. _7 N) Q9 E5 k# j' } set roads patches with
/ w8 k# {7 H! Q: G& D; t [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# h+ T8 k, j( e& I$ R& ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 ~2 R: ]' w" v* d+ C3 t7 z7 @ set intersections roads with
! g u4 ]6 E6 s7 N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 R) E$ Y. G# v& n* p3 K- B3 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 K: Q( B; L u/ B+ i/ o
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ask roads [ set pcolor white ]
/ J2 |0 v4 G0 c. s! d: i6 q# f& F- B setup-intersections
( _# _, w9 B8 S4 ]end
- G% q" b) q& @3 E& U; \其中定义道路的句子,如下所示,是什么意思啊?
( B' q- \% `& ]7 ]! l( i1 z9 S- j" v set roads patches with
# G E/ e+ {2 K% x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# [3 q6 k3 x/ R3 b( w3 X% G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 \) X$ Y6 c- m; O6 e5 |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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