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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。
. v; {8 N5 \7 V6 Q4 h6 fnetlogo自带的social science--traffic grid这一例子当中,
0 c) d; u- A2 u% y$ Y5 S0 dglobals) \2 n5 B H$ H- d3 O" t! w5 D
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grid-x-inc ;; the amount of patches in between two roads in the x direction# [; B/ v) l0 q1 Z2 X- I) U
grid-y-inc ;; the amount of patches in between two roads in the y direction' ?! a. v3 v0 C3 _
acceleration ;; the constant that controls how much a car speeds up or slows down by if, f, F+ u$ Q& X" _7 k- W
;; it is to accelerate or decelerate
8 I1 ^2 C6 l. ` phase ;; keeps track of the phase
( `: M0 X# ]" ^6 V* N9 K; L num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure _) b9 c5 R- u
current-light ;; the currently selected light" w+ `" I: O8 W. d! N. W$ }
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;; patch agentsets
: w3 W! x5 ~7 M% ^% B2 O intersections ;; agentset containing the patches that are intersections* D1 c) Q ^2 h/ C
roads ;; agentset containing the patches that are roads
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turtles-own, Y) }+ u5 Z5 N! u
[
9 k8 i+ O T& v! [ speed ;; the speed of the turtle
p: ~( P/ t1 ?. g6 ^7 v0 A$ N up-car? ;; true if the turtle moves downwards and false if it moves to the right6 B5 W& y u" M5 w1 @& D' \
wait-time ;; the amount of time since the last time a turtle has moved% `& m# j. ~0 q7 i
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patches-own
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1 k, R- q, ]4 `* n) E intersection? ;; true if the patch is at the intersection of two roads$ _0 i$ v- P/ |; B ^+ f& v9 p
green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 r+ M5 Y% k4 a) b2 y" ]6 A
;; false for a non-intersection patches.
, z0 T( X, L; m$ U4 E8 w+ D) u my-row ;; the row of the intersection counting from the upper left corner of the& h3 H+ p! l" ^5 R7 m$ A, X' f
;; world. -1 for non-intersection patches.
! a. C6 ?, F+ k my-column ;; the column of the intersection counting from the upper left corner of the
. Z: K6 B, n) R+ W, y# x: }/ o ;; world. -1 for non-intersection patches.
9 d" S+ \6 X0 W) I+ \. Q+ t" x+ a; A my-phase ;; the phase for the intersection. -1 for non-intersection patches.) N! V2 K1 ~( [7 A: P- Z5 |" K7 l
auto? ;; whether or not this intersection will switch automatically.6 x; F) V+ W2 q: t* `( ?% V7 L) g
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
3 s& A) O7 }" Y# D7 m- };; Setup Procedures ;;
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0 d! A8 k) R& M) c! Y# i6 G;; Initialize the display by giving the global and patch variables initial values.1 Z# e4 H5 z8 i8 p5 S5 b4 N
;; Create num-cars of turtles if there are enough road patches for one turtle to5 B& ~+ c6 O3 W! ~3 K
;; be created per road patch. Set up the plots.
$ p* h4 J3 q8 K3 w: Wto setup
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setup-globals5 p O# Z, }% J6 J p+ u
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;; First we ask the patches to draw themselves and set up a few variables
: n) s3 m/ r4 g8 ` setup-patches( r% O! X: {3 m9 W) ~
make-current one-of intersections7 q- a- [: n, f# f7 q3 _9 ~ x9 }
label-current) a& V% J7 w4 F: m# `
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set-default-shape turtles "car"
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if (num-cars > count roads)
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7 ^3 W' U2 H7 K, y$ k* W user-message (word "There are too many cars for the amount of "
. S0 |; u6 Y8 z( _! Y7 p "road. Either increase the amount of roads "% ~7 v( e" V( Y- g
"by increasing the GRID-SIZE-X or "8 z v4 o2 T! B/ x& r+ M
"GRID-SIZE-Y sliders, or decrease the "4 A$ r" z; ?8 H) K
"number of cars by lowering the NUMBER slider.\n"
+ N. Z7 a8 y' \. W$ x G$ b- T "The setup has stopped.")
3 @ j3 J3 I! |. N3 C stop
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2 s8 b1 z$ f; m+ U ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 |) d+ J0 x) v T- q: [) a) ]: g' s crt num-cars
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setup-cars
8 z8 f( C1 i9 ~1 _' C7 ]- S set-car-color
# |: H {+ ]* ` record-data
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;; give the turtles an initial speed
7 U6 }7 R# N8 p% T! R ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values$ C) r& w6 s' H% R; O9 m
to setup-globals
/ _ G9 w L/ Z" R, W I2 N set current-light nobody ;; just for now, since there are no lights yet
I. o3 ~ h( p; A/ ^9 h+ x2 C, B set phase 0
: L8 c2 S% O/ R- n ? set num-cars-stopped 0
2 F& h9 I% ~3 M1 D* n set grid-x-inc world-width / grid-size-x! C$ k% l' p2 a8 W4 ~" F, q
set grid-y-inc world-height / grid-size-y ^: x8 f: i1 K, A m
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 T; C( W; X6 s; K- g! `( Y, m5 H
set acceleration 0.099" e+ v1 C/ Y. f
end* M; x2 {& ]; V9 s5 G
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* v7 S; H- S, w- c" @;; and initialize the traffic lights to one setting
4 I5 F; J' d1 U9 a( Pto setup-patches5 {/ H0 O+ e+ F& N, F0 V
;; initialize the patch-owned variables and color the patches to a base-color
( T2 G9 C2 i% J0 Q0 i# a ask patches
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' W. \( r+ Z8 I) d) _ set intersection? false
9 Y% a9 `% {9 U$ {' N set auto? false# g m" |2 M- n5 L+ |# m) W- ]
set green-light-up? true6 i0 y) t6 f' a" i% l% B& u5 P4 ~3 ~
set my-row -1
" f, o) M3 m: r6 d) V( u5 y; @ set my-column -1
6 _9 v8 H2 ^& d2 G# b- j! P set my-phase -1
# @7 y# Q3 L+ z% a set pcolor brown + 32 k b. l+ |( x4 s+ o: Z3 F# I
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6 A6 r9 k t& D0 m ;; initialize the global variables that hold patch agentsets
* A( a, i2 G4 K, r set roads patches with9 [& f6 K" s1 @4 W% P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 @! _' Q1 X; X8 b0 F6 e9 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; C; ^# @' ?0 ]) d set intersections roads with5 N4 _4 e* q* n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 U% P7 A% A6 w( _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" A3 O8 |& { n
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ask roads [ set pcolor white ], r) t) ?2 {) T+ w# ^
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?0 H; k( P- e4 K; J
set roads patches with; K# W9 f% v- R9 E2 ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 T) B: u: Q0 A/ Y0 L7 e% x6 K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, J& Z4 t Z- 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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