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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。
4 q0 S# j/ e$ ]. |netlogo自带的social science--traffic grid这一例子当中,
% p$ p* R4 M3 ?# O9 e, r$ S% ?globals
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7 A# C% i# q- h8 p( @5 L grid-x-inc ;; the amount of patches in between two roads in the x direction
* o8 d1 _( g+ D. T grid-y-inc ;; the amount of patches in between two roads in the y direction
, E' p7 ?" H' ^; ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 m8 g. X: a4 l$ \ h# G( D ;; it is to accelerate or decelerate/ }7 N: R( o& ]4 N; w! Q# ?
phase ;; keeps track of the phase8 z) {- G3 T: v& ~
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) Y7 n8 N7 b( @/ E9 q8 O current-light ;; the currently selected light
+ G+ q* y$ P0 k q
+ [: p9 U5 s: b/ k. }/ l2 Q( x ;; patch agentsets
0 ?$ p0 I% h; p0 G9 Q) e0 L) T# q" c intersections ;; agentset containing the patches that are intersections
4 Z. @+ [% F8 T1 X" m# y( e% E' j roads ;; agentset containing the patches that are roads
8 c5 @. V- `7 {( N]
7 P6 V5 g8 d1 }, k2 t. E! D
3 a5 {* s7 A9 G" a: uturtles-own6 H |% w3 |1 n3 M6 Y
[* T% F3 b3 m6 y; z
speed ;; the speed of the turtle( V' R- O9 J1 u: a, K& x' L
up-car? ;; true if the turtle moves downwards and false if it moves to the right# G. \& ^# ]( T" E7 E0 X$ X7 u
wait-time ;; the amount of time since the last time a turtle has moved0 q7 S% E; `! r
], x, q C2 y! H( V$ t
- }7 d, M: z; P) o+ upatches-own3 l5 X7 s/ y4 i* G5 D! _
[
2 \! D( V/ E' |! y( U intersection? ;; true if the patch is at the intersection of two roads
/ a; j& X5 n/ \) k( d" S green-light-up? ;; true if the green light is above the intersection. otherwise, false., |1 o$ N a" O( V8 o; ~ I
;; false for a non-intersection patches. N2 ?' l8 j. V$ h+ k9 ?
my-row ;; the row of the intersection counting from the upper left corner of the
8 k1 n( ^8 H9 i8 d+ H: @6 X$ ~/ |! d/ f ;; world. -1 for non-intersection patches.
* p, J+ d5 Q/ x6 n. a F' {! ^6 I my-column ;; the column of the intersection counting from the upper left corner of the- m& Z& q* R& l
;; world. -1 for non-intersection patches.
! S3 q8 ^/ Y6 y9 Y0 _: w my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 f% z0 B/ r" K. b& D auto? ;; whether or not this intersection will switch automatically.
, ]- e& t/ ^3 T% a ;; false for non-intersection patches.! E, D1 | w* N) c
]
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;;;;;;;;;;;;;;;;;;;;;;4 M: W, ]" M. ^* p8 \
;; Setup Procedures ;;- n! w @" V3 H
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.) Y3 s* O( I9 `; G2 Z r
;; Create num-cars of turtles if there are enough road patches for one turtle to
; E( B9 l2 Q* h2 e4 S2 d5 i! w;; be created per road patch. Set up the plots.
. _* M* C) C8 |$ o# g# jto setup
# p: H. t4 t1 B) b1 i ca; h& x! s/ q' Y/ h/ d' r, w
setup-globals" K5 n) E+ ~9 j/ f
% c2 h# Y' C( G1 ^' G1 {* l
;; First we ask the patches to draw themselves and set up a few variables
$ H# Q( f! [+ L& W- F setup-patches
* y( l& Y3 K1 v @- h make-current one-of intersections
* F+ X# O9 [' S label-current0 }! g; @8 ?; G7 R# }
& y- Q3 E ^' k- R set-default-shape turtles "car"* V9 T( t, c1 z) i. }+ g
1 N, v) Q5 [2 |! e' T2 ~ if (num-cars > count roads)
, {- {- _% o# U+ G4 b+ g" M0 o6 ^) l [2 M$ V7 p" n. |: B
user-message (word "There are too many cars for the amount of "
z4 s: |8 x# S! _" n "road. Either increase the amount of roads "
- S* ?8 b: L% m; k) ~ "by increasing the GRID-SIZE-X or "9 V. ^* ]% X2 A" ]) Q9 A: @' T
"GRID-SIZE-Y sliders, or decrease the "
" ]& u! J6 D# H' s e$ I- E "number of cars by lowering the NUMBER slider.\n"& `( Q1 \, Z# |+ \
"The setup has stopped.")% }# ]/ C0 [/ c( M/ W
stop
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1 @; m: P# a4 @% F ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; A3 ~7 C! G' n; i0 h( K% \5 R, Y
crt num-cars
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setup-cars+ L! y" X5 g3 ]/ y1 G" G; ^' ]
set-car-color$ h9 A" X, M1 U& Z
record-data
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; s8 e& E& ]+ {5 J! @
;; give the turtles an initial speed+ O% n' G! _% W1 a4 m- z
ask turtles [ set-car-speed ]0 [9 e% z) h5 w+ Z
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reset-ticks3 Q- F) K5 h n! l7 `% a0 x8 w7 m
end
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;; Initialize the global variables to appropriate values
; r9 V% C% C9 `2 m. Eto setup-globals+ T( h3 }/ }/ E8 P$ j8 C A. G
set current-light nobody ;; just for now, since there are no lights yet# W& \1 E( G. h' |
set phase 0
4 F# W, F% k/ p set num-cars-stopped 0
) j) y7 R0 G% @# ?/ d set grid-x-inc world-width / grid-size-x# B) F; q: B" o7 {+ T- X4 n: k
set grid-y-inc world-height / grid-size-y
% z% V9 E/ p5 X8 r* c6 }/ U
! O! i1 j! V4 e' N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary [$ X, W2 x; L1 d7 D
set acceleration 0.099
# R7 ~4 {/ J$ B3 Cend& h* d9 f2 I5 D6 r! Z6 E. l
% z, K0 \2 u& I& ]1 V;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 g, q9 F3 p/ e5 K# x;; and initialize the traffic lights to one setting
/ ]8 G2 C5 c$ r" O3 rto setup-patches
( I0 Q- ~9 M& a/ J9 z7 g+ q, @ ;; initialize the patch-owned variables and color the patches to a base-color
' h/ m0 d$ N7 f/ l ask patches
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0 |5 h9 C* Z( p, q' h set intersection? false
9 R, o" k! r: D: i( i set auto? false
, Q# U2 K: N8 O5 h4 H8 n set green-light-up? true f& C5 G5 A: U* g
set my-row -1; p0 B& L3 k0 f9 z8 [' u- x7 E
set my-column -1
! L/ M" ~/ a: H% ~8 m. a$ o set my-phase -1
/ m: ]; V$ K2 U* N set pcolor brown + 3
3 h( A2 W1 r6 Q* @ ]
" c: e& ^, G9 w! {) T9 J, U# E% T3 l9 y$ H; |
;; initialize the global variables that hold patch agentsets( x5 [& {: e6 U4 @6 C* O! f, w
set roads patches with
- ]' ^& @# ~8 } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or }, {/ m6 G$ P, ^8 |% P6 \5 `- C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" Y. l1 {4 L- I; n! `! h set intersections roads with
5 ]& c% H+ R$ ?% ]3 I$ ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ [' _6 v( Z& }9 n
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]: [+ c5 g2 m4 s" E& E3 p
setup-intersections
7 J( c: Z0 `* c, Q: w* Jend
1 I" J! c/ O( A) n1 i' H! w; A其中定义道路的句子,如下所示,是什么意思啊?
7 {( B3 i- q/ r: Z, i6 l4 f set roads patches with2 l$ O$ @; ~! k* [% s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 m7 i1 O. D) P" j0 E; V& j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- `9 B6 a# e) m; m3 y! d# h
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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