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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。
6 U. a: g; J5 f2 z) u; S- D5 m" Knetlogo自带的social science--traffic grid这一例子当中,0 U1 l5 R: I: {: G+ J# m
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
! |9 h( p5 j- R# k grid-y-inc ;; the amount of patches in between two roads in the y direction- w. j* a; i; R3 H; T# K
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ a- r3 ^/ Q, \5 Z. m7 e% |0 J
;; it is to accelerate or decelerate0 e& K+ t: J- W+ x
phase ;; keeps track of the phase
5 S7 e" @' y9 M+ v3 j/ G num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure e2 H" K- Y) \2 t4 p' ~
current-light ;; the currently selected light% b1 b s8 ]' B1 I) L
! b) ~4 r7 h9 C" B" q* w2 v ;; patch agentsets4 c/ N/ z B0 C0 I [) ~0 D/ f! z% o! ^
intersections ;; agentset containing the patches that are intersections
4 ~' e, W4 j* W roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
9 h7 k% w0 \9 {2 n# [ up-car? ;; true if the turtle moves downwards and false if it moves to the right* |- y( ] x1 K% y* K7 @2 K/ t
wait-time ;; the amount of time since the last time a turtle has moved
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7 \) f8 T- \4 ^$ Y$ b4 a" W cpatches-own+ B3 U. A( c7 G- ?
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intersection? ;; true if the patch is at the intersection of two roads3 y8 y0 k; w% h
green-light-up? ;; true if the green light is above the intersection. otherwise, false.1 z: u6 T6 P3 W- P3 H
;; false for a non-intersection patches.9 Z6 k$ [ t( i# \ {
my-row ;; the row of the intersection counting from the upper left corner of the
7 y2 B* ~# o: ^" J8 j% R! {; N ;; world. -1 for non-intersection patches.
7 F2 J( {- k8 k y( K/ d! u% P my-column ;; the column of the intersection counting from the upper left corner of the& X% a( \* H$ T6 m
;; world. -1 for non-intersection patches.) S* M4 V+ A, q: H
my-phase ;; the phase for the intersection. -1 for non-intersection patches.% s3 g! _0 e2 X( Z
auto? ;; whether or not this intersection will switch automatically.8 G, M+ J' J' w) W
;; false for non-intersection patches.
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' G9 A* u. j+ e: e# O7 j;;;;;;;;;;;;;;;;;;;;;;
. M) D8 A2 }! Z, z) P;; Setup Procedures ;;
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1 d3 a, C; U% }, X6 j;; Initialize the display by giving the global and patch variables initial values., v, D \' [" W+ J2 e5 L( l
;; Create num-cars of turtles if there are enough road patches for one turtle to8 h% s, g; ?2 M$ @. P o
;; be created per road patch. Set up the plots., @" y/ B% X+ i: E& I/ ?8 G9 U
to setup' w$ r- _) ^+ U. R/ J! H
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setup-globals: k" d) t, Y/ W8 B( n7 P" [; @) X
0 g# ^: `8 b( I4 _ ;; First we ask the patches to draw themselves and set up a few variables
5 K+ v+ L+ F7 }% l setup-patches
! s' H' E9 ~4 A make-current one-of intersections
1 ^& H4 z1 F! U" J label-current
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) o$ l ^) d1 |) j set-default-shape turtles "car"# t! u* _ R' D) b: h3 a
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if (num-cars > count roads)
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( X9 N! e2 p' d' q7 U5 \9 \( ? user-message (word "There are too many cars for the amount of ", G+ r! Q: l* j( U$ l% h) ^
"road. Either increase the amount of roads "
# g8 h- x Y. e* m: p "by increasing the GRID-SIZE-X or "6 ], Z1 K( v1 t) O8 k; l
"GRID-SIZE-Y sliders, or decrease the "
2 K# b6 J+ n# Q; x& X" i% G, b "number of cars by lowering the NUMBER slider.\n"* A$ C9 K8 T1 J8 T2 F
"The setup has stopped.")" t; X8 t+ j8 Y1 Q% ^# U F
stop
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( ~& y9 h! J1 `! _/ f% ], n7 ? ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 a* T& m2 ?8 x V" c
crt num-cars9 E' v; u; P4 a7 j
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setup-cars
' Z* L) G) G4 A8 |% M/ Z set-car-color
# c8 ?* z9 u. ^ L, e record-data) L! A0 c5 {; F, R- V# u; E& u, d+ y
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9 X. R6 P% i$ x! } ;; give the turtles an initial speed4 j5 u$ S: ?6 e" Q3 N. A
ask turtles [ set-car-speed ]
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reset-ticks
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; o/ b6 Z2 M) D$ P {9 };; Initialize the global variables to appropriate values" g8 r/ N8 U) |
to setup-globals' t3 F! t, X% r
set current-light nobody ;; just for now, since there are no lights yet
" j4 n* [. |7 O4 N" @/ S! b4 W set phase 0
6 A! n, X& q7 i) v/ w! j# M x8 p$ B# e set num-cars-stopped 0
: i% M/ ?/ |, E$ v( r. _9 w" q set grid-x-inc world-width / grid-size-x% u3 G$ y+ e$ d* A2 \7 v. P
set grid-y-inc world-height / grid-size-y) j4 X+ `/ p8 Z! Q
2 }$ t# y- Z) X9 v4 i ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ s1 W% v: f; s, V' N+ w' i set acceleration 0.099" G1 P2 q/ i) n/ k4 Q- }. X- n
end
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! q Q; A" x8 Y+ o# L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 Z1 u% I; D+ [;; and initialize the traffic lights to one setting& `+ Y$ n# i8 j7 O5 [ ]
to setup-patches7 {+ N7 a4 q- u. S7 {) e6 j
;; initialize the patch-owned variables and color the patches to a base-color
4 W) Q! A3 v0 r ask patches
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set intersection? false6 E- R6 e7 P6 z6 p$ @1 i% [
set auto? false7 ?7 b8 N. \: R: f
set green-light-up? true' w; w! b H+ m1 z) s# D5 q
set my-row -16 T6 p- A# r- s6 B; z
set my-column -1' E% ]1 l. f' N& s! P
set my-phase -1
% v% }; ~& W4 }: t! P set pcolor brown + 3( W4 \8 [% @/ E0 d( S
]
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;; initialize the global variables that hold patch agentsets
5 C4 H$ Q# w: H% L set roads patches with7 y: I- T8 h. z$ _0 t; M" h2 |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ N e9 b4 I" b* n1 H |' f5 t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) Q% J9 u. \ i& q3 G
set intersections roads with) Z p' m* N" p! p8 Z) R+ T
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' y* C& n' V/ A1 V/ Z( l: S2 R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 M$ r: \* ^! K- p+ V
, v: x$ b/ P. ~# `1 k ask roads [ set pcolor white ]% T3 f& D/ ?6 W! @7 N- {4 s$ j& k
setup-intersections
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% C9 f8 k2 k( a" @其中定义道路的句子,如下所示,是什么意思啊?2 K+ x8 m1 z( N9 u: ?2 |, Y+ ]/ L
set roads patches with
3 n( z7 |$ K& o8 D$ m: y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& g2 W6 }% j% s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, }/ \: t: v" y. E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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