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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。
/ e/ A: K& a& V1 r$ h$ Pnetlogo自带的social science--traffic grid这一例子当中,4 [1 y- f' X% }
globals8 ~! Y, ~* L% r7 s
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grid-x-inc ;; the amount of patches in between two roads in the x direction# q. \' }# I8 O. F* i/ u; O
grid-y-inc ;; the amount of patches in between two roads in the y direction
, H$ s) e- j3 W+ t+ @. T6 l g8 P acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 ?$ \! m# {+ n ;; it is to accelerate or decelerate N; i8 m9 f- f0 i+ s9 j
phase ;; keeps track of the phase
4 y3 M( |4 ]0 m+ v2 h2 v& V num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 ?5 ?' @4 d$ R* I. m1 X2 f+ C5 j, x current-light ;; the currently selected light9 e2 t) ^7 f% W* S- k& A, m u
/ v5 g; I0 L& U: z# s) {
;; patch agentsets
8 D( i) g$ S% G% F6 G' j intersections ;; agentset containing the patches that are intersections
. Z. U" c e4 m8 N* e roads ;; agentset containing the patches that are roads, X( J& w% [2 H4 h/ h
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+ D/ D7 k0 N4 c, Iturtles-own+ g/ b4 F) ?( Q5 f
[
8 r! ]& t+ z' \1 U* G6 o" g% E speed ;; the speed of the turtle
; t/ r0 O& J0 [: P up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 x0 j# `7 ~# P( c; F wait-time ;; the amount of time since the last time a turtle has moved; m0 s+ Q3 x3 f3 X7 _
]
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
! H$ u. n( I/ N$ U" T$ J green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 B- _' d! j$ n, |9 u
;; false for a non-intersection patches.: _+ J$ N) |% m, Y
my-row ;; the row of the intersection counting from the upper left corner of the
9 D' c' A- y/ Z. K) G$ Y7 x9 z ;; world. -1 for non-intersection patches.0 T( M" R4 R& ?: b9 c' x
my-column ;; the column of the intersection counting from the upper left corner of the
4 V* B/ X! D. ]9 l% b6 S ;; world. -1 for non-intersection patches.
: {1 I7 b! E9 c& f# ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.# D3 @* `4 `- X. d0 X
auto? ;; whether or not this intersection will switch automatically.
4 B9 k4 p5 S8 L: G3 l" p ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;& v% x( {* v i3 I( I5 F" W
;; Setup Procedures ;;& o; D: W3 W1 x$ g) a7 b
;;;;;;;;;;;;;;;;;;;;;;' }3 H/ B4 M/ j8 E5 E
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;; Initialize the display by giving the global and patch variables initial values.+ {; J( G# h+ w( E0 Z
;; Create num-cars of turtles if there are enough road patches for one turtle to( X! ~6 J n" o2 F) K; R
;; be created per road patch. Set up the plots.6 K! j6 g" E( ?) I$ a2 T
to setup
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setup-globals l }9 m3 o0 H+ a. Z- _; a+ _6 R( t
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;; First we ask the patches to draw themselves and set up a few variables
/ c7 C/ t) v6 P; ? setup-patches1 d B+ ^7 O% q
make-current one-of intersections% W6 |; A& }/ q0 n
label-current
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set-default-shape turtles "car"% t2 }5 ]- @) }
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if (num-cars > count roads)5 O _5 v1 M F2 G& @ u" S0 s
[
* K4 e1 c( l) b7 j user-message (word "There are too many cars for the amount of "
8 @6 N& e, _ r; l, r "road. Either increase the amount of roads ") m' k0 @& e1 D
"by increasing the GRID-SIZE-X or "
8 F a9 X. N2 i) A+ h "GRID-SIZE-Y sliders, or decrease the "; \- D6 b; n1 d; ~; L( ]
"number of cars by lowering the NUMBER slider.\n"
! K* Y5 Y! N& M% `8 ] "The setup has stopped.")
# P e9 P0 j! v+ C& @- d stop. h6 V& K+ x0 o: k b7 m
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4 V* {( h. {9 V% E: u ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& E1 [5 R! z/ M4 A; T) _
crt num-cars% ^2 N$ H+ b# W
[
! p/ D+ R+ t: r! l, x. m setup-cars$ F/ l" t* L2 |. P
set-car-color2 h6 Y% j4 [- l# ~# k8 Q# L
record-data
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;; give the turtles an initial speed( p$ o% U" Q0 n
ask turtles [ set-car-speed ]
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1 ~* [- Z& l: b; z, z# x reset-ticks4 {9 a9 \. X, s- S
end7 Z" V+ f$ @5 d) t k
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;; Initialize the global variables to appropriate values
2 p% s, s& \: `. X$ qto setup-globals
7 H) L* W) m2 t- D, a9 v set current-light nobody ;; just for now, since there are no lights yet% g" P @! n9 |# R% ?7 Z: d
set phase 00 h( y. R W# m4 m+ D
set num-cars-stopped 0
- M0 f# [0 | c set grid-x-inc world-width / grid-size-x: |; x- {& s3 }( e6 l' k5 g
set grid-y-inc world-height / grid-size-y Q% ~: B! d# o* v- U
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
H5 @3 z/ Q/ J$ ]: N" K set acceleration 0.099
0 A8 ?0 K. |, Mend
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8 R2 Q7 P0 X# F! d;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, n1 T# A$ n4 \: q- u3 c1 m9 f;; and initialize the traffic lights to one setting
( N* A- t- n& H4 O9 S* zto setup-patches
1 ]" G! R# R/ v% [( K% \6 v( B ;; initialize the patch-owned variables and color the patches to a base-color, G0 q4 c9 O7 ^' T1 P
ask patches
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8 N: o# D# m3 q5 @6 Y1 q set intersection? false# @# K7 }2 n. L3 j
set auto? false; M. w& k' F+ L. x
set green-light-up? true9 n3 r; F5 ]0 I V! o, D4 j. `
set my-row -1( e' X( x, q* A- W6 t. c
set my-column -1* S" H7 u- t) u
set my-phase -1% O7 `6 r p& \# f9 f9 v% B
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets$ J% s. G% Z& y( Y2 i, \; Z" @ i( }
set roads patches with
* D5 |! c6 ^) E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ G9 @" n( i3 y, e$ E |- g/ v* ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 u6 X5 f+ j! }9 Q) a1 R set intersections roads with! ?8 [. q3 Q" R2 ?4 x% e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 n9 S C6 U7 Y, m9 i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( ]% o- `, g+ K1 g: B. x! I0 o
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ask roads [ set pcolor white ]
$ R' z2 u7 y- Y0 D. V4 Z6 | 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?
& |/ Z8 x$ g0 o1 [ set roads patches with$ Z; ~; u# P2 y( X! a3 Z* }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ r$ @0 m/ c3 g/ G" {' v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' e: ^: X$ }5 U; Q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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