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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。+ \- |( D( p% g* q9 }+ v
netlogo自带的social science--traffic grid这一例子当中,
) z' q. V( z8 n8 @, q- _. ?$ p4 ~globals: \" A& j' c+ U8 W& C8 f
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7 m! h0 E* O/ g5 @* O+ A( v' \ grid-x-inc ;; the amount of patches in between two roads in the x direction; o+ p0 E' [& w( b0 b; `9 c8 H3 M
grid-y-inc ;; the amount of patches in between two roads in the y direction7 h! U& e! t J- ?2 \ G6 ~
acceleration ;; the constant that controls how much a car speeds up or slows down by if" @& s7 `. \7 E8 @" o6 W. h6 c
;; it is to accelerate or decelerate
& Z' R0 v4 i% [: s' O phase ;; keeps track of the phase3 [, Q. }; ?# p# }$ B5 {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% _& \ [/ ?% z2 _8 P
current-light ;; the currently selected light
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% {8 V2 o+ P& H: D; v m ;; patch agentsets
; b3 L" ?2 M* O/ f intersections ;; agentset containing the patches that are intersections
! D" [- b+ m! t, [' F( k roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle, b8 ]; R. v, D. A0 V9 a$ E
up-car? ;; true if the turtle moves downwards and false if it moves to the right& w* N: Z3 b) h1 ?
wait-time ;; the amount of time since the last time a turtle has moved
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& Q/ A, _4 j+ ]* v9 G$ tpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
. q5 D4 W- B% j+ E6 H green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 P8 Y3 K* n+ i' N
;; false for a non-intersection patches.+ p' f. }5 o% ~. z
my-row ;; the row of the intersection counting from the upper left corner of the D- _) d2 N1 X- m' ~* k- ` d
;; world. -1 for non-intersection patches.1 I; s) M1 G# L# R* j! x: V
my-column ;; the column of the intersection counting from the upper left corner of the1 k5 D; l' H( @7 }/ E0 ^* P
;; world. -1 for non-intersection patches.
: C3 J/ n! E1 K4 o2 m my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! b, W. B2 \% w; J auto? ;; whether or not this intersection will switch automatically. b% R9 G% l. v
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
# y) t4 L6 d9 F4 T- e) m# H;; Setup Procedures ;;+ f) f, E2 w+ S' y* D" d* a
;;;;;;;;;;;;;;;;;;;;;;# v, d0 E% p& E5 O
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;; Initialize the display by giving the global and patch variables initial values.
1 `# f( c# w5 T5 x! N$ h r;; Create num-cars of turtles if there are enough road patches for one turtle to$ l2 F! |) i6 R9 \3 w1 O
;; be created per road patch. Set up the plots.; K( R; e, f9 k) Q! [) }( K: ?
to setup$ }: @' ?5 D2 O; q8 e6 X
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setup-globals, \0 `! }- e; J7 R5 d
" N+ i6 I9 N1 ^0 v3 { ;; First we ask the patches to draw themselves and set up a few variables
, r2 g/ `# T+ }+ C setup-patches
, g' D. d3 O1 U make-current one-of intersections
* d3 _; Y; Q( l4 ?9 i0 R! A1 x! { label-current- L/ N0 b% I% B& c: t8 B
; {0 l% ?, G/ j$ v& E" q set-default-shape turtles "car"/ m2 y, {& S8 o6 e
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
! l$ g! _2 c: Z( V/ F' a+ w/ T# } "road. Either increase the amount of roads "
8 `3 u, x% G1 ]9 t! u8 @1 l" _ "by increasing the GRID-SIZE-X or "
3 O, K$ T! F) L7 P "GRID-SIZE-Y sliders, or decrease the "% w3 m6 S5 v1 ~8 Z2 E
"number of cars by lowering the NUMBER slider.\n"- Y* P4 S& X5 x2 X4 c( q
"The setup has stopped.")& V: i8 g' n7 T$ ~0 v9 v& j9 v
stop
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) U+ _' F$ h5 L# E! K/ _* q! ] ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 b3 n3 P8 L) x2 ]( A, E
crt num-cars
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setup-cars
/ A/ y3 z& q, j+ ^$ D1 Y; w: ]) P1 l set-car-color' s9 s' [! d! b( M) G
record-data3 I, r4 n8 r. W& u
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;; give the turtles an initial speed
$ Q& P; Q' q2 N8 k0 P( s) y) | ask turtles [ set-car-speed ]
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l8 m7 P6 _& M. X! y reset-ticks
u8 t% y* R( b$ N. g. [+ Rend
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;; Initialize the global variables to appropriate values
7 b5 T" [( r( p: ato setup-globals
- G) Z9 J8 C8 ]* H+ c& o8 q& L set current-light nobody ;; just for now, since there are no lights yet( H, J$ K; ?" h- c! r
set phase 0
' s7 x1 G. W- j, l4 ^ ^ set num-cars-stopped 0, M2 V) V: w% \3 p
set grid-x-inc world-width / grid-size-x& q6 q7 \5 [' w8 N* g5 p2 v
set grid-y-inc world-height / grid-size-y& b5 y/ ~ c/ {1 Z8 P
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ ]& t8 f' ?7 i: W! f, C
set acceleration 0.099
2 ~. @. n; n" E' cend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 I% P5 l7 _5 G$ _6 {1 b
;; and initialize the traffic lights to one setting
& v7 M! @8 e+ ^: yto setup-patches8 P$ `6 K6 F7 }% c% ^* X
;; initialize the patch-owned variables and color the patches to a base-color P" D& {1 h1 G7 Q0 A! O
ask patches# Y. N2 n- v% t/ n/ g
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, G2 g$ H& y5 q+ Z0 a& Q set intersection? false/ M, ^* x1 _9 ]* j% O& C9 f
set auto? false
2 O: ^! m; J+ t* A set green-light-up? true" m/ B3 N# n# t9 W& l: Q& x& A
set my-row -1' D2 J. U/ H) A( M' I
set my-column -1
# t! {- ^& C3 ^! ^* T set my-phase -19 S( n* V$ J" q( k- M
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
. @2 _4 `% A) g2 w8 N) O set roads patches with
- G6 X6 y$ C( K: v8 P: z0 ?& j% B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ Y( @, k6 Q* ?5 J5 s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' ~1 _; {6 e+ z8 d5 E5 U8 M set intersections roads with. X6 b) T6 F+ i) _% g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ G3 | G0 p g9 b* n. t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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1 i, V% @( Q C, B ask roads [ set pcolor white ]" _1 k" s* N$ T! H6 P
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?
1 H' y- j4 D9 p4 E; j2 t' C set roads patches with& N: p% f, R1 c7 V& }* Y1 H
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 M d: r; `8 z( V- j# r7 r1 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ L5 e G ]' _$ @4 M( ]
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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