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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 z; S8 g0 z8 y' n5 rnetlogo自带的social science--traffic grid这一例子当中,2 Q+ e% @9 _( X! p6 Z2 m; |3 y) o
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
8 `2 W# I |4 c grid-y-inc ;; the amount of patches in between two roads in the y direction
% p$ y1 B, W, e6 o acceleration ;; the constant that controls how much a car speeds up or slows down by if8 }# O+ @ A) A$ v( N, `
;; it is to accelerate or decelerate" S) \# i9 M& ?% Z# p
phase ;; keeps track of the phase& C; ?. S7 ] R% | {5 F3 `# c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure F* z; s; n# w& v
current-light ;; the currently selected light
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;; patch agentsets/ t( B2 I6 j! P2 t/ R! h. h5 s
intersections ;; agentset containing the patches that are intersections$ C6 |3 d! T$ z+ G
roads ;; agentset containing the patches that are roads) {* o6 J* `' k/ \
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turtles-own
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speed ;; the speed of the turtle
5 z n! N# f" b up-car? ;; true if the turtle moves downwards and false if it moves to the right6 }( D2 N# ^( k, s. I$ H7 H' K8 t
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
$ U# l8 l7 r7 V8 u6 w$ ~ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ r; [2 x! _& I* q ;; false for a non-intersection patches.
' p; O# f- B) z: a my-row ;; the row of the intersection counting from the upper left corner of the
7 O% m1 {; P- V A6 h0 z ;; world. -1 for non-intersection patches.
X! [2 v- i, m5 ?, Z my-column ;; the column of the intersection counting from the upper left corner of the7 i+ M0 V1 S$ T t8 l2 n! D
;; world. -1 for non-intersection patches.
8 Y( X( q; }" X& F+ o# Q/ A0 p! \ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& i8 W7 C5 y. m4 ] auto? ;; whether or not this intersection will switch automatically.# W+ _1 U$ b+ V, D' ]& I
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;3 U' v% e% n2 z% g6 g" L$ }. q
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
6 m: a; c G& T& h4 d. |% ~;; Create num-cars of turtles if there are enough road patches for one turtle to- ?5 t$ q! b6 m/ B
;; be created per road patch. Set up the plots.- v: t! y: I0 e$ N$ w
to setup
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setup-globals4 `3 H& l+ Q' h* { z+ I- q: _! Y
! W/ e( M Z# O; J- n, p- E ;; First we ask the patches to draw themselves and set up a few variables4 k! @9 A6 k/ G2 w& r
setup-patches
% f6 @6 N+ W4 }* F! r make-current one-of intersections
6 m- ]8 p v4 f5 Q- l7 U* d label-current
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set-default-shape turtles "car"
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if (num-cars > count roads), R; @; l' V6 M4 H B( A- d; H) }
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$ s+ l+ ?) Z+ w- W user-message (word "There are too many cars for the amount of "
' s$ k! K* ?# o3 Z "road. Either increase the amount of roads ") J5 ^4 K3 _8 c! e7 ~6 e, S( s
"by increasing the GRID-SIZE-X or "
8 L8 v# o5 }2 O5 W' K. W8 y "GRID-SIZE-Y sliders, or decrease the "
# c2 D0 t4 o+ X' I$ Z" ]5 m "number of cars by lowering the NUMBER slider.\n"0 _: d4 ? t; |
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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1 V: O0 ?! {: q6 m# ` D: x; `1 t/ V setup-cars
' [$ S- J) Q7 Y2 s set-car-color; E: A2 D2 z1 t0 |5 |- O2 U5 q+ m
record-data- U; g; L/ o N* R( n' }; J
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;; give the turtles an initial speed) a7 A0 g; g0 U
ask turtles [ set-car-speed ]: o0 W7 _7 n* M* c2 k) `4 `" q, N
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reset-ticks7 K% i. L' p8 g3 _0 g
end
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( u; A" _) ` S7 y;; Initialize the global variables to appropriate values+ H% I; M3 X" D: ]
to setup-globals# r* |7 h' Y: e1 Y3 z5 B, P3 D
set current-light nobody ;; just for now, since there are no lights yet( ]# b& w. I J- p2 d3 b) v6 c7 g, g
set phase 0
( a# j9 H, |4 ~) D3 u5 X1 v set num-cars-stopped 04 m- o4 b4 c& o0 B
set grid-x-inc world-width / grid-size-x
3 ?4 i! w9 k8 z set grid-y-inc world-height / grid-size-y# n0 \7 W! r7 y( \
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 U5 M% K0 s4 s7 d9 y8 J q( C
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; e! T) `/ z' z
;; and initialize the traffic lights to one setting
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;; initialize the patch-owned variables and color the patches to a base-color$ K% v7 l9 @# Q- o' t* x
ask patches
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set intersection? false, U; }- Q, f/ Q* V; Y. b* Z6 q
set auto? false* u, j! X4 e }/ u
set green-light-up? true, E5 e$ M& c6 V
set my-row -1
3 E3 v9 Q, G' E3 x set my-column -12 ?7 i/ g0 L$ o: h
set my-phase -1
- ^3 I% U6 v3 r4 T+ ]! l8 J set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
# e! |/ f5 p6 B( Q9 w: _9 W set roads patches with
! K" C. ~' w( _3 C. X' j+ V) D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ d% K8 k! Y6 z' m' `0 B! E9 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 I- \* B/ x0 z4 ^1 _/ y J& R. n
set intersections roads with! F K3 M: h B1 |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 q7 Y3 I6 r/ O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; f3 y1 d, j- O, b
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ask roads [ set pcolor white ]/ u# x! { A- x% K, z, ~7 n( M! }
setup-intersections
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1 H3 W" ]. I. w9 m% H2 M- p" {, Z' Y其中定义道路的句子,如下所示,是什么意思啊?) y0 ]- w5 x# ]) J* ?$ f j- U# j
set roads patches with7 Q. q4 K; t/ x6 \5 W% J" H0 M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: B5 U1 c0 c; i) H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 t( W; I6 J, U% \* T" x0 E" ~
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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