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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。
2 T' Z0 q* H+ d/ n0 M2 gnetlogo自带的social science--traffic grid这一例子当中,# R: W6 X Z+ J6 g/ Y3 H: r7 e
globals
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) q- ~; M; H* _6 J) c! x grid-x-inc ;; the amount of patches in between two roads in the x direction
" y% i; D0 h/ _* F' D9 M& L' i! i grid-y-inc ;; the amount of patches in between two roads in the y direction
' J" n* L" S( a& G( v3 b1 L acceleration ;; the constant that controls how much a car speeds up or slows down by if
) y9 }0 I0 s2 k) t) y T& [ ;; it is to accelerate or decelerate
7 v8 g% F4 `" v1 k% ~ phase ;; keeps track of the phase
5 ^- n* V" j5 z1 \ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure: C& P/ y+ }4 W% O0 ?* @
current-light ;; the currently selected light0 n" v3 k0 P c& }( M
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;; patch agentsets' Z: n! a! z2 T
intersections ;; agentset containing the patches that are intersections
. @! p, b4 Y# _& g- R$ B8 ? roads ;; agentset containing the patches that are roads5 k6 D2 {2 P7 C$ B: k& i
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turtles-own
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$ _) L" [# I2 g speed ;; the speed of the turtle, V; a. D4 K K* v& i$ M/ C7 }
up-car? ;; true if the turtle moves downwards and false if it moves to the right
E1 G& ~& ?/ i+ Y wait-time ;; the amount of time since the last time a turtle has moved5 B5 g' z6 Y7 l
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' G) z$ {" i) G* s* Z3 |8 D6 |4 Ppatches-own7 I3 L9 Z1 r/ S. |
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" J4 _! _. k( U q intersection? ;; true if the patch is at the intersection of two roads" @4 k$ M1 o7 N: ?4 a2 @8 d
green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 U$ g) v: Y( V# Q
;; false for a non-intersection patches.
* d9 b% ~9 Q9 B/ r my-row ;; the row of the intersection counting from the upper left corner of the* T9 v3 x4 ?: D7 K' K1 ^: ?
;; world. -1 for non-intersection patches.
# w/ f2 {: O7 t: i# w my-column ;; the column of the intersection counting from the upper left corner of the
, J2 O/ g! g0 h4 @0 o ;; world. -1 for non-intersection patches.: k# M r8 m! ?& c) X, V
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( m( Q; }* ~$ g5 Y/ ?
auto? ;; whether or not this intersection will switch automatically.
( H" V! l! {# ?" q2 [5 F7 w' |9 i( ~ ;; false for non-intersection patches.) c+ i, Y1 x! i* F! m9 U5 i$ E1 f
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$ ?" S3 M# D* n0 T;;;;;;;;;;;;;;;;;;;;;;
0 [' o6 `) C( d;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
. D v1 b. h5 c1 P* };; Create num-cars of turtles if there are enough road patches for one turtle to# L3 p1 r* w) P
;; be created per road patch. Set up the plots.
! G0 {/ Q( S @; V) ]to setup! U7 @" `3 I5 A1 \5 s3 z# X
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setup-globals5 N6 x, x; V/ k7 Q- c2 J
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;; First we ask the patches to draw themselves and set up a few variables
/ B- T) S& f8 ^; {# S' K& } setup-patches
4 [' @' G3 }% d8 _; L make-current one-of intersections, V7 _2 |8 P* `/ ?* N9 `
label-current4 s0 a1 @# M0 X
6 c* `( W4 C1 j6 P& n2 g set-default-shape turtles "car"
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1 A$ E9 i J' V) l& o5 M6 `, S% j if (num-cars > count roads)
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' M# U( P' ]* ]. [/ Y! Y; k" | user-message (word "There are too many cars for the amount of "1 `8 s- h& g5 Z6 p
"road. Either increase the amount of roads "
) d8 p8 n7 c2 g) a1 T "by increasing the GRID-SIZE-X or "+ `4 Y. u6 y* `7 A
"GRID-SIZE-Y sliders, or decrease the "
. N# J# F2 z' E5 U( x "number of cars by lowering the NUMBER slider.\n"
6 G u7 j4 z- }+ J4 i' u% j( t b9 J( L. r" Q "The setup has stopped.")
7 j; M6 ~5 i+ q3 X stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; \0 P. P) t1 f | crt num-cars
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9 B% S; u0 K) t/ k0 v3 ?5 K setup-cars
4 v: P& y7 _/ T( B set-car-color0 M! b( r: p; d9 I
record-data& c! C$ L$ v9 [/ A7 Y' O& J% m+ X
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5 {3 T7 c3 S1 q A ;; give the turtles an initial speed3 f% v7 @7 `1 N+ h) b0 {6 G e3 A
ask turtles [ set-car-speed ]" v, H2 m- b0 A. x* i) p
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reset-ticks h, x0 o. I- Z
end
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;; Initialize the global variables to appropriate values
% E/ Y4 t: G }" w. [7 d+ Oto setup-globals
- u) }- K. `0 _1 a set current-light nobody ;; just for now, since there are no lights yet
$ ?7 n5 E, C+ p, c3 w9 b# M set phase 0
$ E4 V# ?& {4 Z5 C# |+ H set num-cars-stopped 05 g- y5 c2 P l6 j
set grid-x-inc world-width / grid-size-x; y) h& ?& @0 u2 X
set grid-y-inc world-height / grid-size-y" d9 M; n0 [6 ?. y7 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: U- I% i6 C! i. T' x7 U( l
set acceleration 0.099. m) O T9 L( U
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ Q3 D) x Q2 P+ w;; and initialize the traffic lights to one setting
5 ?( L2 _4 F- _1 k& hto setup-patches% V v6 H! A* R6 t7 j( X! z
;; initialize the patch-owned variables and color the patches to a base-color
7 C- X e7 Q$ |" v0 f0 m ask patches) r4 ?+ H) y: P" z' H1 e' F
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set intersection? false
7 n7 X& _# `% h set auto? false# r9 o/ F! |0 i2 O6 I! N% a
set green-light-up? true7 m9 Z6 w% v: `: i/ y9 l
set my-row -1' |# C: u j- q! M
set my-column -1
( Z2 W5 S* [: H5 n set my-phase -1' X( Z o* x% L
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets9 r8 ~) s9 K, D6 l5 @! x
set roads patches with
! {; T! h; E1 c: J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. F* E% i2 k' ]* i2 c7 u. y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* `$ i) @+ y" |" q* S, [/ m; _
set intersections roads with/ k7 d& V' C: D: k: i4 A
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' c0 e- Q. {) t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ x& S3 v( Z" e9 v
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ask roads [ set pcolor white ]
$ G& O. }' p3 j1 j setup-intersections B! H. b+ f3 k3 k
end
7 {5 i5 C: z; z: W* l7 J) @, ?0 k其中定义道路的句子,如下所示,是什么意思啊?
& @) M0 H( R9 a/ F: _ set roads patches with
3 ^) W8 z, U: I/ Q' }( h: H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 u" j* T: w+ o* ^4 p. o# S (floor((pycor + max-pycor) mod grid-y-inc) = 0)] r4 V! W3 X+ L; N; X R
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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