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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。5 O! x) H: \& G7 H" c: ^$ G
netlogo自带的social science--traffic grid这一例子当中,! @$ v7 u. [) ^4 j2 G# L4 J
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
2 E4 z- `# j$ q z8 N4 X! l( f7 f grid-y-inc ;; the amount of patches in between two roads in the y direction
7 L9 E+ i4 ?( |0 C6 O# s) o acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 E/ Z, i; s! v4 ?! B' M ;; it is to accelerate or decelerate+ B! p) I0 t1 v$ H
phase ;; keeps track of the phase
# q% Z: g8 U+ U$ i' u num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; C4 {* y& M- I9 B% d# c4 e
current-light ;; the currently selected light( V; x; z$ a9 P+ C
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;; patch agentsets# @7 k1 C! E2 `1 @2 A, u
intersections ;; agentset containing the patches that are intersections+ o/ [2 S4 u `; @* A
roads ;; agentset containing the patches that are roads3 a' ?% c5 h: S2 \
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turtles-own; L$ g) h4 q Z. W, a* N/ S
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speed ;; the speed of the turtle: D$ y5 v) N( o& H: E( ?2 G
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; T' Z4 R) X k3 B& r4 N, D wait-time ;; the amount of time since the last time a turtle has moved
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' c# `; x* `& Zpatches-own# v4 O. U6 J! w2 \# M' u3 P: ]' }
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intersection? ;; true if the patch is at the intersection of two roads
3 D6 ^. l" C: Q& k( [ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
7 |/ {3 c6 B. N ;; false for a non-intersection patches.0 i8 c2 t, q0 K. R% _$ h1 i! Z
my-row ;; the row of the intersection counting from the upper left corner of the
; v4 ?6 U4 _+ }3 k ;; world. -1 for non-intersection patches.' l+ d6 @" T5 c
my-column ;; the column of the intersection counting from the upper left corner of the
( g$ g. d+ R% \3 ^% B5 ` ;; world. -1 for non-intersection patches.; b6 W- I) H& g5 J3 O7 \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 W4 w. v* B! R, o) `2 u# b
auto? ;; whether or not this intersection will switch automatically.0 v. r: L9 B) q* j& c2 _
;; false for non-intersection patches.
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5 A) J- h3 u+ I* s6 r;;;;;;;;;;;;;;;;;;;;;;
) P8 B6 M, W! W' e% a;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.- O6 |1 d. S* M: h% i* K. n
;; Create num-cars of turtles if there are enough road patches for one turtle to: A; J* P( Q+ i" }0 Y
;; be created per road patch. Set up the plots.
7 R! J/ A! ?5 S; I* U3 Lto setup
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setup-globals% D" ^9 m J1 T/ `: s( H0 [
8 r$ B$ R) ^" q* v/ R5 P4 u ;; First we ask the patches to draw themselves and set up a few variables9 D# [( n0 P% w% |7 h
setup-patches- g# X% {. w( V2 n" Y2 m
make-current one-of intersections
; C i8 c0 Y4 }/ F label-current, d) v6 p4 G _' k. D* c7 V
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
7 `- Q. p% [4 o- ^( {5 G "road. Either increase the amount of roads "
9 J' t) N/ F3 n3 O "by increasing the GRID-SIZE-X or "1 d2 F7 ~, Z. r1 e* u4 Y
"GRID-SIZE-Y sliders, or decrease the "' q1 {1 D. y; a) E
"number of cars by lowering the NUMBER slider.\n"
6 F7 i! C) y1 A, m# b/ R "The setup has stopped.")
, [" A m2 J: Y4 R! G7 A2 R stop3 l, @$ L0 ]3 _. o' i
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/ R! ^9 {0 A% L& i) m8 w ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 l6 U& R( L. Y6 @8 \# T5 Y7 u
crt num-cars1 T- @) ?" l" t! p" p
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setup-cars
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+ u/ V0 G# O7 @. B( F( u5 y r record-data, u% o6 D& a4 z, i# m0 Y5 i
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( ]/ w- A1 T8 c, p9 b ;; give the turtles an initial speed$ }1 N# _. M$ J V7 N4 C
ask turtles [ set-car-speed ]
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reset-ticks
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+ g9 V# u( F% w9 _" f4 ^, k;; Initialize the global variables to appropriate values- i/ e5 k% {. e6 @+ T! H# ~
to setup-globals
" K# X. z6 D. j: y set current-light nobody ;; just for now, since there are no lights yet
9 W: ^7 Z( o! Z3 d9 M0 W0 a0 Y set phase 0; C( ]0 j# z! p; p5 J; P+ u, I) F9 Z" |5 E
set num-cars-stopped 0 ~8 ~ {3 a7 k" ~
set grid-x-inc world-width / grid-size-x
5 U; b6 _% F( Y set grid-y-inc world-height / grid-size-y1 ~, W$ h, L) P: P4 B& X: B# O
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ w( H% l5 W- F# ~- L
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& Z3 q; `( h, i+ X2 ];; and initialize the traffic lights to one setting
# v# g# [8 k, Nto setup-patches
' w: t) J5 g. a# K- h5 { ;; initialize the patch-owned variables and color the patches to a base-color6 j( S* Z" ?) {3 `" X& \
ask patches, O5 b/ ~" k3 @+ j
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set intersection? false
# s4 {; ~5 E( q: `" T2 j2 W8 b set auto? false1 w! T; ~ V' _( G4 d
set green-light-up? true
5 ~/ H9 r j/ r8 Q+ p S U set my-row -1
7 d h. H$ O3 H0 L7 _ set my-column -1
1 i* F0 E- w8 S2 i9 N set my-phase -1' P3 A- d* q7 b6 ]: _
set pcolor brown + 3% A1 K. O$ e( t
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;; initialize the global variables that hold patch agentsets* S% ?% f: ]% ~9 x* w6 H% l: {! H
set roads patches with' i( o5 g8 m- I7 v, O/ p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( c! S2 Y/ x' m$ W; R% N8 _, }3 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ [3 P6 _8 ~1 t+ g set intersections roads with$ j( w. c# N; a/ ~! @# W5 n9 X( [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* ]4 H4 h( U4 u$ N/ y1 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! {; L1 `. ]4 k% b$ w K
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ask roads [ set pcolor white ]- p$ k G! U0 v2 U3 Z
setup-intersections
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0 t! f8 z/ f1 b+ K其中定义道路的句子,如下所示,是什么意思啊?
( T" W9 L; R2 u. I; { set roads patches with
$ Z! p2 Y4 y; S+ Z/ t, { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ h R+ A0 `7 E% p% H9 V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)] ?5 c+ u/ S3 S( ^- E7 v
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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