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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。
% x$ Y# f3 m6 n. nnetlogo自带的social science--traffic grid这一例子当中,
: g9 R7 W% @5 e) C7 a+ n6 A' f- Q) fglobals/ W( ^: a9 n, x' O
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- T* f; c* X5 t8 G4 y5 n \) ~+ } grid-x-inc ;; the amount of patches in between two roads in the x direction
6 A j J1 d5 a0 v grid-y-inc ;; the amount of patches in between two roads in the y direction
/ ~- e$ h8 N8 c9 _: m acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 X- G4 _; c9 G8 h ;; it is to accelerate or decelerate6 }9 N/ l6 q3 } o
phase ;; keeps track of the phase: E* h$ }2 N3 S/ Y6 |( g: y$ H
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: \+ K+ H1 g" l2 {& C current-light ;; the currently selected light: Z( k' v9 _" g
; F& o' G3 R3 U ;; patch agentsets
' d& Y4 m! ]+ B8 [ intersections ;; agentset containing the patches that are intersections' U: U0 ? {$ t/ M) @. n$ B4 D
roads ;; agentset containing the patches that are roads" B1 V7 ?$ M5 o# v% c4 @7 P" `
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# z3 w! z- Y' T, yturtles-own7 X J9 f" v5 [9 X
[, o& ] ]( Q+ N2 V, `, A! ]3 Q
speed ;; the speed of the turtle
, W7 H4 V2 O& G1 Z. R up-car? ;; true if the turtle moves downwards and false if it moves to the right
, y: }& R& s- S3 S, Q1 _8 U3 _ wait-time ;; the amount of time since the last time a turtle has moved; K2 J: H S( ?9 _, d
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$ q6 ]- `: O1 U1 Qpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
, M) U% X5 q6 ^" I, | green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 z" O& {. y# M3 F1 b* F2 p ;; false for a non-intersection patches.
& N1 @, ~3 D. p1 n4 B6 V my-row ;; the row of the intersection counting from the upper left corner of the
- x+ c( Z! W7 R5 x" o4 e ;; world. -1 for non-intersection patches.3 F: x! K9 Z3 K/ h8 ^8 {& _* R( q
my-column ;; the column of the intersection counting from the upper left corner of the* \/ r2 V* G5 H& ^/ `+ l
;; world. -1 for non-intersection patches.3 n; n: z$ l0 O6 g0 j6 a. w3 R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ Q4 u0 X& S. m6 k$ r; J) B9 D
auto? ;; whether or not this intersection will switch automatically." W4 I: b3 k" b) K4 H( m
;; false for non-intersection patches.; d1 p5 p3 @8 }9 _: n3 W% D. E' \
]
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;;;;;;;;;;;;;;;;;;;;;;
5 r5 Y% ]% L) M# f: Q, i3 f% Z! r;; Setup Procedures ;;7 L: d9 h6 X5 \
;;;;;;;;;;;;;;;;;;;;;;
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) j' V2 h7 u0 m+ g* K! x;; Initialize the display by giving the global and patch variables initial values.
1 E. h1 Z, ]. V;; Create num-cars of turtles if there are enough road patches for one turtle to
: W* h2 ~( k# r' i# l+ r8 B;; be created per road patch. Set up the plots.3 h# x' h$ b- J1 }1 z9 t6 E
to setup& s4 I! s; Q2 n+ `3 K, \# T0 U1 Q6 G
ca
/ u( z# D. i7 |; W6 ] setup-globals4 U T9 c9 O7 I% z- G
$ {, L0 l. T- j- w% w- | ;; First we ask the patches to draw themselves and set up a few variables8 {$ J$ u2 Y! m
setup-patches7 X, J* B# Q) T2 G0 m
make-current one-of intersections
( h& U4 O0 [0 U k u) j label-current7 M6 U$ ] {0 a/ W( }/ [2 b' b4 q: G
8 ]9 Q1 |+ \5 N( w9 e set-default-shape turtles "car"- C2 f4 X4 Q f6 s2 s
/ \8 x1 H9 F( J5 b# M2 \6 v+ i7 V0 w. M if (num-cars > count roads)
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3 g( D5 G) X; K user-message (word "There are too many cars for the amount of "
7 t- S1 S: o, N! |& l' K "road. Either increase the amount of roads "
9 v- t, r% ^2 c- A; Q/ C "by increasing the GRID-SIZE-X or "$ a5 i* r1 ]& g
"GRID-SIZE-Y sliders, or decrease the "
0 d8 N; R2 u6 Y- d "number of cars by lowering the NUMBER slider.\n"
$ q# K! ]# Y4 g$ B "The setup has stopped.")) B _" t) O4 H2 b; n
stop! z% c7 F! H0 L) F- F) z
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 G8 J/ C& }9 O
crt num-cars# u' V* Y: Y% p1 i6 {+ Z j
[
5 _1 i) h; v. N5 K& \ setup-cars/ z [4 |0 B* s# G( c$ g) i
set-car-color
! o! }' W5 f5 r7 V6 b ~ record-data5 \( e# x7 I; q0 v8 C
]
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+ @) F E9 _! B5 {' y: r* q' v! D& R ;; give the turtles an initial speed
/ M: e2 M5 D& J5 h ask turtles [ set-car-speed ]
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reset-ticks2 i1 z% @- V' x; b6 D" B/ f
end. {, L5 @8 b- P- D' d
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;; Initialize the global variables to appropriate values
( n o4 C+ s7 l5 P, kto setup-globals
* J" K, z* j- J; F) r' T set current-light nobody ;; just for now, since there are no lights yet9 F1 A6 Q% j" `, i
set phase 04 y% S6 D0 a: C9 o* {$ `
set num-cars-stopped 0
5 A: Z" ? x' W3 X set grid-x-inc world-width / grid-size-x8 l% L: [6 v# h+ y+ G0 n
set grid-y-inc world-height / grid-size-y
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5 b6 L* v! e5 b7 `6 O4 n& E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
q0 h) y( y4 s+ J' @$ q set acceleration 0.099
Z1 i9 @: V% L1 E+ x. K* `3 Nend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 L0 f/ H9 b6 q' S9 l; o;; and initialize the traffic lights to one setting
- k5 G* y3 B: G/ s- ?$ pto setup-patches
6 S5 L: J' b) \4 N% d9 e ;; initialize the patch-owned variables and color the patches to a base-color3 v" N% T% t3 h& m2 ^# V
ask patches7 L, `- J' P( @! m' l
[
7 Z* A* J2 ^" J set intersection? false3 W, N7 x" L6 s+ u: r2 r
set auto? false% V# i( L: Q4 I9 T9 q! T3 d/ \
set green-light-up? true" Y3 |# F4 e" a* i
set my-row -1/ g# b+ Z' }) I2 k9 N
set my-column -1/ |2 L8 W8 Z: c
set my-phase -1
$ G `! Z- T6 Q( [& L# s$ i+ W set pcolor brown + 3' U& i$ i" G1 e2 c; V0 _2 N
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0 @# X2 X B. r8 j ;; initialize the global variables that hold patch agentsets
/ I" }7 S/ h S: m3 o/ ^) t+ B set roads patches with
/ X3 P9 _2 x/ v( k5 ^& U [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& z2 ~. s! Y4 p5 [; g (floor((pycor + max-pycor) mod grid-y-inc) = 0)] O& ?' Z' e. {
set intersections roads with
' b( N- _) [3 @& s8 \" q, Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- i2 u( d( y, N6 E5 r$ a (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 H9 H) M2 a. `( v L
" \! f0 I8 m9 \ ask roads [ set pcolor white ]/ f' I q3 X& N/ R7 X
setup-intersections( T* J" }. D J
end
8 L9 q6 E- G- D) a* F其中定义道路的句子,如下所示,是什么意思啊?
3 \3 d5 e# g2 i# D' Y/ p& w6 s: L, X set roads patches with) z% B) s6 v2 }2 S( k7 v1 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ b/ e3 u% S6 y, m3 ?, u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! v$ F) O9 U& o' f2 e9 g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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