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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。
: ^) w5 E# b) T6 B" `- x7 Bnetlogo自带的social science--traffic grid这一例子当中,
5 y! k' W' p1 I4 J" _. sglobals+ D: `' W5 _3 [! i
[
) d/ L+ s* a, u7 u5 \* u* U grid-x-inc ;; the amount of patches in between two roads in the x direction" p, ]4 e7 S+ I/ z
grid-y-inc ;; the amount of patches in between two roads in the y direction
- ~/ A+ i7 J! u8 \2 ^" I6 G5 ~ acceleration ;; the constant that controls how much a car speeds up or slows down by if
, ?: @& j- L* I+ g ;; it is to accelerate or decelerate4 @7 S. n4 y* C3 I8 L5 ?8 P
phase ;; keeps track of the phase9 G6 i2 z0 n4 |* D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 \5 m5 _: Y9 B3 [+ P5 M0 k
current-light ;; the currently selected light
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( H! M/ ]# x/ E" ]- B" p5 t ;; patch agentsets
( ~; O# Y* ^* l8 _6 ?: ^ intersections ;; agentset containing the patches that are intersections) A+ @ N( }2 o* m6 b* S
roads ;; agentset containing the patches that are roads& B# |( o( M& H7 W* @( j9 t
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- X% b: x9 |2 X3 kturtles-own1 Y) j3 K2 W' }+ y# h
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speed ;; the speed of the turtle. k* G a! Z% `. d% x
up-car? ;; true if the turtle moves downwards and false if it moves to the right/ `7 K9 v- d/ f# P/ K
wait-time ;; the amount of time since the last time a turtle has moved7 X# B8 e4 X8 p9 r- j( ]$ v
]
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patches-own% l* S( F: U9 Z" m1 G' ~
[
0 ] j& A& X+ d intersection? ;; true if the patch is at the intersection of two roads
$ _7 N5 J6 d& q5 \- {+ g* G: p green-light-up? ;; true if the green light is above the intersection. otherwise, false. n/ V0 @4 q5 a3 Z
;; false for a non-intersection patches." F. X3 S- E; u8 R
my-row ;; the row of the intersection counting from the upper left corner of the
$ @. Q3 {6 V3 y7 q ;; world. -1 for non-intersection patches.
" K g' R1 e( A, H my-column ;; the column of the intersection counting from the upper left corner of the
: ~$ Y( \( W. b, Z, f, Z4 c+ n9 U3 c ;; world. -1 for non-intersection patches.
6 P: A s# D. p; ? my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 l" _& X' G" I$ C' f
auto? ;; whether or not this intersection will switch automatically.+ @$ F, U; h( h9 J
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;* M' G$ v. ]9 ?) E) X3 T
;; Setup Procedures ;;6 o' K% [& s1 _/ [
;;;;;;;;;;;;;;;;;;;;;;5 J8 B' U. }8 K% T: U5 b+ ^/ u- b
* q" V9 n% {; o* r n0 {;; Initialize the display by giving the global and patch variables initial values.
2 T! P, U/ m' B5 j" D! P;; Create num-cars of turtles if there are enough road patches for one turtle to
/ A- m, F7 E4 h! p;; be created per road patch. Set up the plots.
) D$ ?4 e+ ?. N8 }5 V7 Y2 d% Nto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables% K* y3 c: I( T* x* W
setup-patches
( c5 W- M& T- @ U1 z make-current one-of intersections
+ x0 H6 o& z& w9 g label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)6 V! N( g4 _8 h6 [' a
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9 n! a9 H: i5 q; k+ D9 b) Y- P user-message (word "There are too many cars for the amount of "
0 Y) |' C C+ P "road. Either increase the amount of roads "
) B" L$ X1 ?" x% A, `; Z7 \ "by increasing the GRID-SIZE-X or "9 K1 U5 o4 z5 e7 ^! n
"GRID-SIZE-Y sliders, or decrease the "1 Y5 P$ B [' b5 d% y1 p- n
"number of cars by lowering the NUMBER slider.\n"
! j e: z+ {/ a% j" N0 B+ E "The setup has stopped.")
. G8 U3 ` b" ], }: q" [ stop* U0 O+ E, K1 L# u+ D, Z4 S
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 }$ ^0 N0 N5 O/ H
crt num-cars3 ]. f+ ?7 \7 i1 O) J! I4 E9 L
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setup-cars$ j$ t i! d) S# R+ T
set-car-color
3 C! N3 a* f, ]- O record-data
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;; give the turtles an initial speed# X0 B% u& v' F; f
ask turtles [ set-car-speed ]
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' Z# P' j, c3 X* I$ }- \ reset-ticks
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;; Initialize the global variables to appropriate values+ K- x, }; a' N0 k& e
to setup-globals5 ^8 `! N& e$ V5 |# F' N, p
set current-light nobody ;; just for now, since there are no lights yet5 e( f) \4 `8 z1 s9 l! V
set phase 0
4 y7 J t+ R6 y4 y4 u$ O9 ]8 [ set num-cars-stopped 02 B8 m2 H! A( ~, [! _9 I8 Z
set grid-x-inc world-width / grid-size-x3 S* ^' E, ]8 `. y( L' K+ K
set grid-y-inc world-height / grid-size-y
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- `1 ~0 z, X9 k6 } ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 K" {' n# d2 D9 T set acceleration 0.099/ u5 @8 W1 x! c+ W/ W) k p8 V
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& i% d' b5 b1 [+ a
;; and initialize the traffic lights to one setting! S% `" g2 I! M( N
to setup-patches6 D3 m0 z0 F8 \: \
;; initialize the patch-owned variables and color the patches to a base-color' u t: C( a6 L# S G0 F, n
ask patches
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1 x' w- K: Q- ^: t5 a4 ~ set intersection? false! e% D" b5 B) e' @/ A" W9 i, s1 X
set auto? false, b6 J! G c* X% q1 j
set green-light-up? true
. y8 @4 x7 U9 `% s% p, R set my-row -1
/ X/ c9 R6 s, ^2 F: Q set my-column -15 P9 }) j! B7 C. F
set my-phase -19 H& L" ?# A1 Y/ a' P
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets3 d' u+ w& Z$ O
set roads patches with
5 X- w3 Z; P2 t' \& g5 A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ X5 O. E3 {( B1 W9 c* `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: H' E0 y( t; w5 S2 ^" j6 ~; J
set intersections roads with! V! k2 A2 A& B6 Z4 _3 P6 N3 e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 E1 Y6 v3 Z8 @
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], k+ c/ P& j1 ?$ X; |$ G, p
. X1 J' N) e( u, I$ a8 e ask roads [ set pcolor white ]
6 K- |- ]: L- f; T c/ Z setup-intersections
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6 S# @ o; r0 ^其中定义道路的句子,如下所示,是什么意思啊?0 Z8 [) Q8 n) M9 Y
set roads patches with% D7 K. T9 u* n, t' f0 @( d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& V- H0 m3 f: y- U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* ~1 ^" y o7 ^* l6 s7 c9 d
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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