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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。! \3 ~* q, V9 u( G6 @5 n5 D
netlogo自带的social science--traffic grid这一例子当中,
1 K7 C& ?* d+ f2 bglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
$ L0 }6 a1 P( R) ` grid-y-inc ;; the amount of patches in between two roads in the y direction, P9 u* @: g z7 a6 y5 t
acceleration ;; the constant that controls how much a car speeds up or slows down by if
* M7 B+ Q" f" a; s' o ;; it is to accelerate or decelerate
, O0 \/ b# J1 p# W# [, u phase ;; keeps track of the phase6 n$ z3 e) x P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# D' p3 p0 \8 Z4 z; X" V7 |
current-light ;; the currently selected light+ {( I/ k& u* d' k
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;; patch agentsets c/ c, ~/ P0 M! f4 G% m% n
intersections ;; agentset containing the patches that are intersections
/ {" O4 W, u6 [8 F+ {& P8 @# X( W roads ;; agentset containing the patches that are roads; w/ V- C! F0 b% O, ~
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& D: |0 S" B/ w; A6 [0 wturtles-own
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0 F |: x/ L* }; x' n! f# g speed ;; the speed of the turtle
- T: R, K- V; _: H+ a7 ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right# i w: W! i' V$ P9 y6 o
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own( v" B/ a+ j% _. V; w& \
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intersection? ;; true if the patch is at the intersection of two roads( U: _0 G8 I5 s8 F( I
green-light-up? ;; true if the green light is above the intersection. otherwise, false.; N2 P. A- @# |+ @; S% d
;; false for a non-intersection patches.
% p, D( ?7 J% l& M( X my-row ;; the row of the intersection counting from the upper left corner of the' F4 y& n* A0 f) M0 B, \9 o
;; world. -1 for non-intersection patches.) u; b- C4 F3 s4 ~! `* x4 U
my-column ;; the column of the intersection counting from the upper left corner of the: Z9 D, O% R8 s+ O9 v
;; world. -1 for non-intersection patches.0 [6 G; T& f1 r, ?) w% |, R' m9 }
my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 a0 A# r8 U" V
auto? ;; whether or not this intersection will switch automatically.
- B0 W9 m# T3 t" u ;; false for non-intersection patches.8 D1 N b# t1 K |
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;;;;;;;;;;;;;;;;;;;;;;
' {- }) @* E H3 \0 a/ r;; Setup Procedures ;;1 D" }: S# v w% [' H- ^
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;; Initialize the display by giving the global and patch variables initial values.
& \/ }: c0 i- h2 ?. R5 E;; Create num-cars of turtles if there are enough road patches for one turtle to
$ ~) U1 `) ?$ P, T;; be created per road patch. Set up the plots.
x( K9 k: I6 E( H8 t6 w" bto setup
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setup-globals3 B& ]- S8 h9 q0 E# g. U/ v
+ t! F. I. r$ w2 o0 u ;; First we ask the patches to draw themselves and set up a few variables
8 {" A$ h4 g' X setup-patches8 |* T* E- M1 s" M/ i$ U
make-current one-of intersections# ^' }3 L3 Z, S; T ?
label-current* \9 ^& D. A1 ^; S/ `
& {: R$ J5 B) n5 X" b set-default-shape turtles "car", K& T0 \5 m% i
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if (num-cars > count roads)' W) P, w) V; K1 Z' i$ ^
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user-message (word "There are too many cars for the amount of ", u2 A8 `% v m2 d3 ~
"road. Either increase the amount of roads "3 Y7 Q7 y( S2 z l) ^
"by increasing the GRID-SIZE-X or "( d7 \7 x! J! F% X8 ?
"GRID-SIZE-Y sliders, or decrease the "$ K' y% A7 J/ p; ]1 D8 E; O7 \1 b. J
"number of cars by lowering the NUMBER slider.\n") @5 w/ x2 y. I% z+ K, K+ b: k) w
"The setup has stopped.")- R( w& Q/ f7 x" j% t# W3 C0 }: Q
stop* U/ n4 G4 h w' O( ~ ?7 @6 d
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; `8 X5 |: l/ |: R! M4 n4 e% T' ` crt num-cars+ M9 `' E& Q* ^0 W, @
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setup-cars B& E& `# Y5 V. J, G7 y
set-car-color, V; H% g; O; y |8 T! Z
record-data& Z) |$ M3 O8 l1 S% S
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5 Q, l7 O) ]% k/ ~ ;; give the turtles an initial speed
$ |3 E4 Q7 |3 N( u1 i ask turtles [ set-car-speed ]
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reset-ticks% `& r/ x) g M( s. }! w
end$ z' u: Q, F7 a$ Q$ R
9 H8 M3 D _) Q8 O;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
4 }$ i! ?- X% ]1 \( e+ C7 Z set phase 0
4 Z, y! Y/ S7 ?0 O set num-cars-stopped 02 [- q/ E- G4 H- b8 P
set grid-x-inc world-width / grid-size-x
( O8 C% G8 l+ r( B" }8 { set grid-y-inc world-height / grid-size-y
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9 e2 x V; D+ m" ~: c& f) P" N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' W# Q' \0 Z; C8 K: E# U set acceleration 0.099
7 c0 d8 M& s; I- V. ]end4 Q$ _# Z/ R( l" Q% z5 g8 q
8 [5 L" P# f2 T1 H;; Make the patches have appropriate colors, set up the roads and intersections agentsets, _8 m) P8 K4 l' W
;; and initialize the traffic lights to one setting. k( ~3 e) t0 n6 r$ E3 t
to setup-patches
0 D, s1 s& @1 r, E' x ;; initialize the patch-owned variables and color the patches to a base-color, k. r+ R) y( i# j/ I3 E
ask patches
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# ?) b$ K. M3 C, r \8 [( ` set intersection? false+ S* B. f _+ K& k: H) r) x4 l: F& R
set auto? false- m0 b! q2 a' N7 e: W d7 m2 ~
set green-light-up? true1 \1 L- h/ ~; ?( w- S; d* s c
set my-row -1+ d. _# V) b) L$ K7 n0 `
set my-column -1
5 G- K5 ?* x: ] set my-phase -1
) Q3 z, a0 w1 {. [* R+ B set pcolor brown + 3+ b7 @6 t+ a& \. z
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! m& v) ^; M$ S1 E, q+ ^ ;; initialize the global variables that hold patch agentsets4 F3 A4 p' [6 G+ o% S2 ~! D
set roads patches with/ w; J* w: R/ q5 ^1 x) Y( I P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ b7 v1 J) g. V2 J: D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" L! I. X" @9 Y! [ set intersections roads with. o0 W3 l) z/ e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ B2 }! a2 q) w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 w5 `( L+ ?7 g* @$ h
- [7 n$ v2 Y/ E" y" C! Q ask roads [ set pcolor white ]" X! ^" H- k8 m6 t4 I
setup-intersections
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% I4 y# X1 E, \其中定义道路的句子,如下所示,是什么意思啊?3 |, `* r2 O! b( `
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. E0 d9 s5 l, y" L. |9 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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