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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。) C8 n7 Y! M+ K/ F
netlogo自带的social science--traffic grid这一例子当中,
' I+ ~2 h, _9 M" f' [globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction& x {$ D6 n# A) ^3 M# o
grid-y-inc ;; the amount of patches in between two roads in the y direction
! F* E1 c2 ] ^ y; E* a acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 i& D( p, g, C+ w, X/ E ;; it is to accelerate or decelerate
# n$ a# ~1 I* o( b phase ;; keeps track of the phase& g$ ^' l( e7 n/ \, P: p
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# ?5 r7 Q8 y( P/ W1 v9 T
current-light ;; the currently selected light# H8 Z0 d. x7 v
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;; patch agentsets9 b# o' D' n# C/ l" P7 ~. M
intersections ;; agentset containing the patches that are intersections
* b* Z W0 B. \1 h* [4 Y$ ], j2 Q6 B- O roads ;; agentset containing the patches that are roads
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turtles-own3 U* P9 q. l" _0 ^2 ?$ ]
[
; J- e$ Y& x6 \1 W speed ;; the speed of the turtle
1 R; V5 P9 C$ v9 m% R5 d up-car? ;; true if the turtle moves downwards and false if it moves to the right
" C, ]( m4 g( X6 Y& ` wait-time ;; the amount of time since the last time a turtle has moved" Z$ b0 I% y0 n# f2 z# \+ E
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7 W3 v- A; _; ^6 r$ K( c) Ipatches-own
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intersection? ;; true if the patch is at the intersection of two roads/ S5 b% p( F. a5 _
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- V5 |# U' A3 w, @ y ;; false for a non-intersection patches.7 V( V1 l( y2 A- L2 c; R3 i% P) [( C
my-row ;; the row of the intersection counting from the upper left corner of the
6 d& M' z+ P5 y: x" D0 G0 ]( e ;; world. -1 for non-intersection patches." t, s7 }6 v/ p! ?. g) a6 v9 R
my-column ;; the column of the intersection counting from the upper left corner of the
! ?1 \9 u$ Z4 Y$ {& E ;; world. -1 for non-intersection patches.+ \5 W0 A0 y5 ^0 f; [
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- V7 m: _6 d) x, L: j- w" q
auto? ;; whether or not this intersection will switch automatically.5 ~; ^* v$ i- ?1 k# d4 I1 T
;; false for non-intersection patches.
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l8 n9 Q: B3 p7 a! w& O* U [' @;;;;;;;;;;;;;;;;;;;;;;
" C7 V) W: P9 h/ c: ^" U+ d5 K;; Setup Procedures ;;4 Y! W$ K# T/ [3 U( p3 W
;;;;;;;;;;;;;;;;;;;;;;: V1 r4 K6 s, R3 U6 `( M
& a: [* P3 D# y {: B$ r& P h;; Initialize the display by giving the global and patch variables initial values., p5 Z+ O6 d0 J6 I
;; Create num-cars of turtles if there are enough road patches for one turtle to
4 E- Z6 b2 ~* ?% f- m Y j) i4 c;; be created per road patch. Set up the plots.
( G4 `6 L- A) g5 sto setup" a7 }* i7 l/ B8 p1 O
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setup-globals
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; r* d' U7 h" \/ m ;; First we ask the patches to draw themselves and set up a few variables
0 Y/ [4 Z' h* L$ W+ d setup-patches
: _5 B0 E$ E7 L. B, n8 I% ]: l make-current one-of intersections
- j2 C" u L( v: W label-current3 y7 _2 f9 p4 w
5 O8 y; O: A" S. d! [7 Z: g set-default-shape turtles "car"
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if (num-cars > count roads)
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, M( m5 o8 s6 v3 o$ a user-message (word "There are too many cars for the amount of ": R) |7 H) r- M& I4 J. z
"road. Either increase the amount of roads "; K8 |' W1 h2 e5 U/ F& A$ [' ]
"by increasing the GRID-SIZE-X or "/ ~- f9 ?3 Q/ D& D7 b8 ^- e6 o
"GRID-SIZE-Y sliders, or decrease the "
2 \8 S0 u/ i3 _4 |2 J "number of cars by lowering the NUMBER slider.\n"
; h0 ]. @8 `1 d7 B; p/ A$ o% h "The setup has stopped.")
& d0 M- [; I( U! u stop
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2 X! a- R' O. l" p8 S1 v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 X' d$ n0 D# D0 m crt num-cars8 w1 o5 K+ U$ T) N3 ~7 I, E l
[
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set-car-color
4 ]: \) q8 I! P4 r record-data
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;; give the turtles an initial speed
: y( Z* ^# A& p. K9 S ask turtles [ set-car-speed ]
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reset-ticks& F& y0 M0 l5 N1 b: B8 @+ x
end
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/ c$ o& |! F8 [$ `9 ^' T7 };; Initialize the global variables to appropriate values& p& ~. ] f: e: {1 g* Q
to setup-globals5 c, E( {: R5 \
set current-light nobody ;; just for now, since there are no lights yet% q) E" {% S/ K- w
set phase 0
6 l% x/ J1 N; O% B set num-cars-stopped 0! ^% |0 W& z8 i/ L$ H r
set grid-x-inc world-width / grid-size-x
3 J4 B6 `$ N/ @ set grid-y-inc world-height / grid-size-y. E* }4 ]9 d# X* G$ I) I/ L
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ R+ L0 y/ P7 w+ o8 T8 M set acceleration 0.099+ [. ?: {* L' x- q' f! ^) v! X% ]
end
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+ M& T& u! a- n4 g6 E6 a& X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; j+ k! G6 S V$ t/ ?
;; and initialize the traffic lights to one setting. L" N- D& U& }! C; I3 p
to setup-patches+ i( M e# ]* y, I3 j' ]
;; initialize the patch-owned variables and color the patches to a base-color# d. D6 J5 Q" r2 |" n4 \1 d: r
ask patches
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set intersection? false4 m, _- X5 x7 _
set auto? false, y1 {% Q" G# H1 _
set green-light-up? true
! f6 @8 \: E/ i7 u4 R! V0 P set my-row -1! J6 I7 N( O7 ? ^
set my-column -1
3 X8 R- s, w* m set my-phase -1- ^6 I0 u/ T+ G5 p1 ~# K
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets" w a# ], H5 r& e
set roads patches with% J. D/ R0 h( E" m+ Z* }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 p1 w: ~, q8 X1 X. t: j( T: p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; k% c! E& Q' O+ l! y- g. N) F
set intersections roads with
" o( ^0 U( [& X, `: { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' K* m2 B+ ~3 m* h" v2 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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3 n1 d& w% V# \. G8 z ask roads [ set pcolor white ]
( S# R7 ]6 ]( Y& F" @! f2 ~ setup-intersections
; F. _* K1 F6 m/ N) b @# ~end
0 X0 A- Q/ {, c- n+ f- }其中定义道路的句子,如下所示,是什么意思啊?
; J- m6 K( E) K/ h. |; C! {/ M set roads patches with* R1 |- m7 ~9 x6 u- T4 B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: }; |9 ?( }" ~! _3 O4 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" f& Q6 u6 T+ f% _) s/ @) w+ D6 L
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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