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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。
& A+ `) c7 l+ i+ R8 ^5 Xnetlogo自带的social science--traffic grid这一例子当中," `3 {- ] S5 a/ |6 ]
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
# ]8 \3 \3 A5 X; c- i2 `2 @* r grid-y-inc ;; the amount of patches in between two roads in the y direction
! _. A) }$ ]3 J, F8 C acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 Y6 B% t7 {5 D$ ^: X ;; it is to accelerate or decelerate
0 R" t: w/ I# N phase ;; keeps track of the phase
9 v6 _9 _; w5 p+ H% C( P' } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 `* u9 K/ c/ s/ D5 t current-light ;; the currently selected light, d8 a6 x; w4 Q/ t
0 |$ q* Q- ~/ I. d ;; patch agentsets
; x4 X" E' H7 D: J& h- s, c intersections ;; agentset containing the patches that are intersections
/ a$ r- g3 d" Y$ u# \0 T- a roads ;; agentset containing the patches that are roads) s9 F @; P* v; B0 B9 q4 M
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turtles-own
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speed ;; the speed of the turtle
) [* V( j' y W9 _" O up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 @9 z7 t0 a" a' z: y wait-time ;; the amount of time since the last time a turtle has moved! Y0 T/ L# b* ?
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9 d' P) t# K4 A. U) X+ b4 Vpatches-own
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0 R$ \7 W% d# D intersection? ;; true if the patch is at the intersection of two roads$ L3 w! E1 a. e( H: H
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& l3 U9 ? U7 H0 q- B ;; false for a non-intersection patches.
. O( o" y3 V' z4 u/ E. l7 B my-row ;; the row of the intersection counting from the upper left corner of the
/ Q/ ]5 c$ E- V7 j. ? ;; world. -1 for non-intersection patches.
; |/ N! D, `! k" |# a* T7 v) T my-column ;; the column of the intersection counting from the upper left corner of the
) Y' v9 u4 D$ X. [. k5 O ;; world. -1 for non-intersection patches.
( _( G0 w$ v! ^3 J0 H my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* M& V" _$ ~+ M3 E, H! l0 R auto? ;; whether or not this intersection will switch automatically.
( V j' y1 H2 x q( A ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
8 v# X* o. y0 C;; Setup Procedures ;;' S- l3 t4 _3 {, S" h/ S% M; i- ~
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;; Initialize the display by giving the global and patch variables initial values.
& ^& J6 W' N/ x' c1 L;; Create num-cars of turtles if there are enough road patches for one turtle to
/ @4 X! C4 N& q( w& j. Q;; be created per road patch. Set up the plots.
- h$ V. `: c, C5 n# t1 G, J# Kto setup9 e; E3 W3 H8 a8 I
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables' a- Z9 X6 V! I# X% Z9 @
setup-patches
4 p, R/ c/ ]2 c& {# d* { ]: J make-current one-of intersections j9 K" [( L v; |5 c) ?' G7 l. |
label-current
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9 e' s" @! |0 C6 g6 } set-default-shape turtles "car" {8 A) a k+ b$ g
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if (num-cars > count roads)- |: I) S1 b3 g$ Y p6 D9 I
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user-message (word "There are too many cars for the amount of "
5 y1 A# R5 Q4 d: i" W$ P0 g "road. Either increase the amount of roads "! B Q( W/ M( A! _8 r+ l: U
"by increasing the GRID-SIZE-X or "/ b3 i; u7 d) Y1 V
"GRID-SIZE-Y sliders, or decrease the "4 Y4 f2 |, k# z) ~. D! K
"number of cars by lowering the NUMBER slider.\n"+ N6 ]( `( q9 s+ b7 v$ `
"The setup has stopped.")
( a6 g" S6 K$ X% ~ stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% S% R: j' q$ G, e+ B; e* l: p# `
crt num-cars
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setup-cars: L# `0 D1 n$ j/ Z& J: ?, o
set-car-color
3 Y* y) V' f- M* Y record-data
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;; give the turtles an initial speed7 I% S4 I7 d! h1 M- C% b
ask turtles [ set-car-speed ]
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2 E& H2 x$ D9 Z8 a8 y, @ reset-ticks- I& z* B7 s( d
end% w& o2 j" n T5 f
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;; Initialize the global variables to appropriate values/ U2 E# Y4 l3 K- ~- G+ P9 H, O
to setup-globals
. I/ l; W4 C. ], ^$ c set current-light nobody ;; just for now, since there are no lights yet
9 p: t1 h% D; h- b0 T" z1 r; R set phase 0
9 F" i$ e# u; ?2 W2 h3 U. q set num-cars-stopped 0
2 }4 [- K- Y7 ~% Z set grid-x-inc world-width / grid-size-x
( E1 l; N& x' d f6 L 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" l* ^& E; f0 @+ _4 m! y5 c
set acceleration 0.099
& E3 D7 g/ a) y2 p( ]end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 E ]9 a1 s0 d: @! S6 S9 m3 J
;; and initialize the traffic lights to one setting P6 c7 @' i8 f! @$ Q. p- A& F
to setup-patches
& k M& ^- n7 p ;; initialize the patch-owned variables and color the patches to a base-color1 Q1 V+ G- M0 _$ Z5 v) a
ask patches
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set intersection? false, h4 j+ K" C: m
set auto? false
7 z% D, h; r+ j: ]% d) {; b set green-light-up? true
2 g% _ r# ~8 ?, }+ W set my-row -1# T {9 L- y* z+ w1 k
set my-column -13 q) e4 Y) ~5 _, Y/ v
set my-phase -1
3 P" v1 I+ J& U set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets6 j# N" q- m$ h: L; G
set roads patches with
- k3 K9 R; b5 [; H* S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* d$ X! O3 ~) u I, @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) Z6 j7 B5 F0 x) D/ ` set intersections roads with
4 ]0 p* ]1 l1 r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 @, W7 p! D* q. G0 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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; U3 k# L, [! Y6 \ ask roads [ set pcolor white ]; L4 A. K. ^, R ?8 u/ Y* N" K
setup-intersections
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# [3 k6 K; u8 F$ I R @: X4 G1 B其中定义道路的句子,如下所示,是什么意思啊?) y& V2 x, p. ~, t
set roads patches with# [# t! J, y% @. J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! @: r7 }7 `; W6 R# m! m, ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! p7 z' @7 ?- ~/ b
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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