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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。
/ w# p% v0 u& ?' g5 K0 x3 s$ m) B4 inetlogo自带的social science--traffic grid这一例子当中,( o; Q/ U' Z4 b. _3 P
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grid-x-inc ;; the amount of patches in between two roads in the x direction! {4 X$ n' J! m
grid-y-inc ;; the amount of patches in between two roads in the y direction! c- G# B" `8 F3 U- m7 t
acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 T6 a3 k* z, U) |' x& i# N q ;; it is to accelerate or decelerate
' i, J+ o( Q- T1 S" m1 P+ [+ _ phase ;; keeps track of the phase
: R3 H' S7 [8 n8 q" I" t& l num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; T) ^8 A8 L* C5 W6 s, }8 B
current-light ;; the currently selected light
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;; patch agentsets4 g6 i' R$ S: u' |
intersections ;; agentset containing the patches that are intersections5 V4 j' W8 a& K5 `3 Y
roads ;; agentset containing the patches that are roads
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5 Z w! A' p6 p* Jturtles-own
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0 Q+ [: E# ^; o2 b- i" W8 A) b- { speed ;; the speed of the turtle
& g. x2 B- j. e: {( R up-car? ;; true if the turtle moves downwards and false if it moves to the right
2 z. _- h$ ~+ X0 S wait-time ;; the amount of time since the last time a turtle has moved P7 j8 e$ @. @, R
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patches-own4 G% a Q0 P4 V' G. |+ U2 X6 y6 y
[
9 W4 ?4 ]8 K& n" O) s& e( ]" Q+ ]5 s intersection? ;; true if the patch is at the intersection of two roads) l6 R* v$ O! ~
green-light-up? ;; true if the green light is above the intersection. otherwise, false.+ ], u: o( T& f
;; false for a non-intersection patches.7 _9 P' d8 G e; y! W4 g& F
my-row ;; the row of the intersection counting from the upper left corner of the
9 ]+ Z. f2 t _6 W1 x ;; world. -1 for non-intersection patches., S+ W9 a. N3 g! ]7 S. m
my-column ;; the column of the intersection counting from the upper left corner of the
: F' p" \$ P) [, q! Y- d* P' C ;; world. -1 for non-intersection patches.! ?5 _6 z6 Y) J+ T6 j3 n% W" u! X
my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 z* c6 A' l1 Z! Y* Z8 ^
auto? ;; whether or not this intersection will switch automatically.
- S+ u. ~" }" E4 D- F5 v ;; false for non-intersection patches.
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* O0 E- w7 [0 ^;;;;;;;;;;;;;;;;;;;;;;, h }8 Y' \ a5 Z6 h8 Q1 r+ V2 Z: j
;; Setup Procedures ;;" K% L' l/ T* n
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' P% D5 Z1 G' I8 |;; Initialize the display by giving the global and patch variables initial values.
8 l, H8 s, b" o+ b) ~1 M) J! E: G;; Create num-cars of turtles if there are enough road patches for one turtle to
6 ]+ R+ R$ B( M' O: P;; be created per road patch. Set up the plots.
$ l" M4 u6 R+ i$ X; |! Nto setup: {2 f6 E v8 n. l& U& j/ H
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setup-globals2 p- r a1 P6 d
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;; First we ask the patches to draw themselves and set up a few variables# E( [4 K$ V2 n- p5 \
setup-patches; p5 F5 o3 [9 r
make-current one-of intersections* p- }* ?+ E: v+ \
label-current6 V8 O: Y: W/ s* @8 V9 W
: a1 C1 b6 R7 O% P9 f8 a% `8 q set-default-shape turtles "car"
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+ {" P+ T- C2 l& u if (num-cars > count roads)4 C4 o% ` n: W( _5 }! M
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7 T l( [7 x) p user-message (word "There are too many cars for the amount of "
8 D' U2 ~2 d" E5 v' v% k6 L "road. Either increase the amount of roads "
; D+ c9 d$ L# Z& Q2 ? "by increasing the GRID-SIZE-X or "
: O! F# R% ~( M9 R1 m1 }+ e "GRID-SIZE-Y sliders, or decrease the "
. C x4 m+ n8 W9 ? p "number of cars by lowering the NUMBER slider.\n"
0 y; v# N1 C. t- v0 ^/ C% ^ "The setup has stopped.")0 @5 Z3 ]& x5 o8 s1 p2 Z7 N9 E
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 R9 O/ L- p# u7 D. a! w
crt num-cars1 x5 h {) P! T+ ]
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setup-cars5 i- f! F' S- C5 E3 ]6 h
set-car-color1 H2 {1 ]) }8 _9 B6 E
record-data
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# u) J4 z8 j- ~9 \2 c1 w# L ;; give the turtles an initial speed4 \! J1 }4 r; _% }3 z+ x$ F
ask turtles [ set-car-speed ]
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reset-ticks
1 A6 R7 a5 c/ Y+ W: ~end
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;; Initialize the global variables to appropriate values: \' A O% y; @/ I! O
to setup-globals
' |3 }" F3 F. j1 N/ i, P( m3 ]4 p8 m set current-light nobody ;; just for now, since there are no lights yet2 a5 B- d9 ^' j9 M) D
set phase 0
; z; V3 M' v1 e! `# c2 ^) k! k; R# R set num-cars-stopped 0
* F) N8 U, U' {0 b6 n4 [ set grid-x-inc world-width / grid-size-x( B) G. g$ R: i n1 }3 C
set grid-y-inc world-height / grid-size-y7 Z8 t' J2 ~1 O& A; B G
) z# W+ }6 i. D3 T4 V, g2 `) z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 `7 s ]; R/ E; @' N
set acceleration 0.099
4 n7 Y7 v- d) C* F, jend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% Q3 n. j; m. b z1 P' T;; and initialize the traffic lights to one setting
6 c: D9 h' i8 F/ u Ito setup-patches: i& O4 M( U! n
;; initialize the patch-owned variables and color the patches to a base-color# Q4 J4 ?* p( P* s
ask patches
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set intersection? false
# G0 t* V$ E' X1 R7 S2 H set auto? false
& B# }: J3 e8 M5 v" w set green-light-up? true' O5 }9 }! d. C" C7 v
set my-row -1' Z9 Z l, ?' n6 x2 h
set my-column -1
8 S8 b# A# W4 P$ k) z ^ set my-phase -1. g% U7 k4 I; [' x; z: L3 \# r
set pcolor brown + 34 q! e5 C3 H$ O* I4 B
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;; initialize the global variables that hold patch agentsets
; c8 u# \/ R: y- Y* e* G! U set roads patches with1 G3 O% ^, X$ ~9 r" f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 ]9 b& X6 M4 j3 B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) Z8 m3 ]0 `1 A. @; b5 D6 @
set intersections roads with
5 T+ r! f! m) o. `6 d g* s! \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. b2 n1 w1 _, O D% v! y; H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]8 r' ` k. R# g. j% {9 \5 \' L
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end
. q, h" p# j3 ?; D, {4 h其中定义道路的句子,如下所示,是什么意思啊?
/ n& o# u. r* K! Q set roads patches with7 ^( K9 _: m1 {0 `% ]- f9 f4 @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 w: I& w6 a2 o0 I3 V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 F6 g+ ^$ C J
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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