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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。
0 Z( `6 ?9 f# _/ t3 @. _netlogo自带的social science--traffic grid这一例子当中,
4 ]$ y0 C3 b$ nglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction% ]: ?, k( L$ C- v2 l" ?" B
grid-y-inc ;; the amount of patches in between two roads in the y direction
2 w' u- i% w# Q: p2 }3 b acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 K7 V" C4 F. F2 U: S9 s ;; it is to accelerate or decelerate
$ }* X5 U! d* Z1 p1 s# d A3 N phase ;; keeps track of the phase
# y+ s: ?, x* X1 X6 n% B% W/ M num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ r( J, ^ \. k' T; V" e current-light ;; the currently selected light2 w% {; T4 s, F9 o
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;; patch agentsets: ?" b7 D* f# M1 Q
intersections ;; agentset containing the patches that are intersections4 ~' \# E0 t2 i/ H
roads ;; agentset containing the patches that are roads6 h; A& ?& ` ?1 H4 a h! v
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4 w# i2 I' |2 B sturtles-own+ ~& Y. }' r4 N# N0 @$ a. @
[
^5 b8 a0 H$ z4 V; ] speed ;; the speed of the turtle# {3 ^ `: ^, ~" i
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; n! R1 r" ?- E2 g4 a! V wait-time ;; the amount of time since the last time a turtle has moved
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" F* x) j& d% e0 P) Ypatches-own
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intersection? ;; true if the patch is at the intersection of two roads c, O5 C/ A. u6 D5 @8 }2 |
green-light-up? ;; true if the green light is above the intersection. otherwise, false. v5 O5 N% r. T) |$ p3 z
;; false for a non-intersection patches.
, v3 f4 f9 A3 w" F) L# Y' w my-row ;; the row of the intersection counting from the upper left corner of the
6 h4 b. v3 z% C% M& j! | ;; world. -1 for non-intersection patches.
4 B) ?) q- [0 S, F1 b9 l. Z# z my-column ;; the column of the intersection counting from the upper left corner of the
' x u& c, L8 _0 q0 G4 l ;; world. -1 for non-intersection patches.- ~/ z: _- G4 K, E/ K: b g1 M7 G$ j
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( @9 r: D$ r/ K7 A8 M% r auto? ;; whether or not this intersection will switch automatically.
, a5 L2 n8 _( G& n2 ]8 I* n9 P ;; false for non-intersection patches.8 V# W# g2 U. d* u# m- [
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;;;;;;;;;;;;;;;;;;;;;;1 H# c" l% k9 {- v" D- T
;; Setup Procedures ;;
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; J3 U# z3 B# |, _; p;; Initialize the display by giving the global and patch variables initial values.' s/ M( D, }- e8 V$ f
;; Create num-cars of turtles if there are enough road patches for one turtle to
- n* n' l4 b& h0 f9 p;; be created per road patch. Set up the plots.
7 }# g2 R- n1 e1 d% Nto setup9 M1 i* ?( _: a' o& ]2 F8 D
ca
, {4 |) X, V2 D9 v- e$ h; d0 ^ setup-globals
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8 Z' `4 |7 ?& |7 z ;; First we ask the patches to draw themselves and set up a few variables
Z7 y1 b" A7 M/ P+ v9 Z' ? setup-patches m7 e! C4 c" A3 Q" z2 R$ Y9 g
make-current one-of intersections1 ^) |! H7 j% U5 Z% A7 u& w% J% `. _
label-current
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set-default-shape turtles "car"$ ], w: G8 J1 n$ j8 l3 G3 _; a$ G
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if (num-cars > count roads)$ x' l8 T7 R5 |+ ?3 S1 `3 {, ~
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1 B6 Q( _) Q; e# b- E user-message (word "There are too many cars for the amount of "
% b9 V: m/ \ g+ u% { "road. Either increase the amount of roads "
+ s* l7 s7 V j& @7 s) x- H& ? "by increasing the GRID-SIZE-X or "
0 S# H' \: B2 m8 [2 h* ?8 W* K "GRID-SIZE-Y sliders, or decrease the "4 l$ {* [9 k4 ~ ~
"number of cars by lowering the NUMBER slider.\n"
. p: |; L) ^# q) n9 M. Y3 W "The setup has stopped.") `2 ]) a* _( O" _, X- W
stop) T+ ?3 z/ n1 T3 x2 ?0 P- Z. W
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. _% }8 m6 M, N- g W' q crt num-cars
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setup-cars% m P; }+ w5 J
set-car-color
0 Z# a% e+ K, e4 e( f% A/ K record-data1 z" F8 P) @+ t: }# @
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3 x7 @2 Z- M! P9 S+ ?& N ;; give the turtles an initial speed
; Z. C3 q/ G9 w3 U% M; G% u' j ask turtles [ set-car-speed ]7 I7 n2 y0 @! g) l
' x* P6 j& t* o/ M. a0 p; M, v8 q reset-ticks
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$ o' l: f1 P y4 e& ~, F V;; Initialize the global variables to appropriate values% S) A& P+ P2 x& p' M6 S
to setup-globals0 ?" V D1 Q& s9 r2 p
set current-light nobody ;; just for now, since there are no lights yet
' w# g) I4 Q! H8 ^ set phase 0
2 s8 k2 W1 g6 h/ @7 Q% {4 X set num-cars-stopped 0
, i6 o. U: K1 P set grid-x-inc world-width / grid-size-x; p: O' i$ v- {! Q' R# m
set grid-y-inc world-height / grid-size-y* ]! t* W2 X9 q" ^5 Q o4 _9 m. \
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* K9 Y- P/ c/ ]. a, q
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: [* c2 E; _( C' { A6 ^8 j! Y;; and initialize the traffic lights to one setting
* ~7 Z& [' ~( Gto setup-patches+ G8 `' x" d. ~8 I4 }: T
;; initialize the patch-owned variables and color the patches to a base-color
4 y/ v3 n+ u' U0 ^7 \) B- T! r ask patches* e6 e+ Q% a' a5 b7 m; C
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, e% \, U/ Z: ?* f6 o4 b3 c set intersection? false$ X7 d2 j5 \- R3 l3 B. u' I
set auto? false
! Z4 Q0 O |: B3 m! Z3 _6 @( p" A1 l( ]+ Q set green-light-up? true' A( I6 ^2 L+ q' S3 H% g# s
set my-row -1
! e# s& o) x2 I" w set my-column -1
( n: o6 p1 B. Q0 `" ? ^; e set my-phase -1
8 w" `' Q! C! v0 ?* O! p set pcolor brown + 3$ v6 \7 h, p8 E& W. I! K* c2 }( E
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( F0 V6 A# L( N& S2 H) G# ~/ o ;; initialize the global variables that hold patch agentsets, k! f) Y! Z3 V& P
set roads patches with& B. X% y; f! k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 t! P3 } q4 ?* p8 o- h" I D4 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' b2 a0 o2 N1 X1 v: u, J5 I set intersections roads with
5 V+ ]7 {: |8 c9 w7 i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- |/ h! C3 V, P) p# `9 I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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+ Y4 z! y( F0 T! n" d' R" {- ?) ?2 u ask roads [ set pcolor white ]7 |4 H1 c! [8 d" t
setup-intersections' F; Y, b4 u7 \, B; G4 m' {8 Z
end/ v5 c# ?& Q; h+ n: R' ]. T
其中定义道路的句子,如下所示,是什么意思啊?2 ?9 N% C/ u6 Q p% k1 i) \
set roads patches with
6 f( K$ x4 {' p- P, w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- H- f+ n) _, u& S) `& y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 N1 w1 j$ ~- k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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