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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。
% S) _( L7 A8 v A9 B* rnetlogo自带的social science--traffic grid这一例子当中,
+ N, q# Y1 B$ aglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
( u" K6 [% z/ i: Q grid-y-inc ;; the amount of patches in between two roads in the y direction
9 ~& ]" H- r5 n8 S$ M$ }$ L acceleration ;; the constant that controls how much a car speeds up or slows down by if
5 d( j( N' ?: y) e+ U h" j( j ;; it is to accelerate or decelerate
' P: X! W: n, W9 L4 P0 L7 X0 [" p phase ;; keeps track of the phase, |% p8 ~. M) t1 C: |1 ]
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 _* n2 w& R, |4 c
current-light ;; the currently selected light
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* I8 N; K. g, R ;; patch agentsets" g3 L9 l7 L8 B7 [( s0 U* Y
intersections ;; agentset containing the patches that are intersections! P6 _$ n' G* Q. Z7 N; ?9 s' H
roads ;; agentset containing the patches that are roads
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* ^' O P/ E7 G; _( o, x$ Lturtles-own
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speed ;; the speed of the turtle
7 a' ?! E3 ]0 {2 d up-car? ;; true if the turtle moves downwards and false if it moves to the right3 M0 @/ Y2 t6 Z5 U9 E- t& m
wait-time ;; the amount of time since the last time a turtle has moved
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: c- d! K- K$ z% `: w( K, n0 p9 g' Cpatches-own: c+ G1 D4 R; l/ R
[
3 Y! g5 [0 L& o; O1 u- c intersection? ;; true if the patch is at the intersection of two roads
. z8 e5 x: e7 K' g; b9 ?- {7 L green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% c$ L9 @) ^- C) \3 B ;; false for a non-intersection patches.
8 D& T% m0 G3 e: S9 d3 F. j( P my-row ;; the row of the intersection counting from the upper left corner of the
; e5 h1 x# l! V5 h( `( \ ;; world. -1 for non-intersection patches.+ p7 ~4 g( D& ~
my-column ;; the column of the intersection counting from the upper left corner of the8 _9 x! M2 F7 x. m, Y6 z! F
;; world. -1 for non-intersection patches./ V4 p' ^) V3 R$ k8 B4 t4 a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
8 i% i* T2 j. g) T) f* f e9 W. ~ auto? ;; whether or not this intersection will switch automatically.
: l$ p9 z- A8 N6 C' X( @" Y, D ;; false for non-intersection patches.2 m( A) {6 p4 ?& F) i9 g
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;;;;;;;;;;;;;;;;;;;;;;
6 x8 f O# ~' A4 _5 A;; Setup Procedures ;;
9 E9 l1 c6 l; I U& u;;;;;;;;;;;;;;;;;;;;;;, D4 R9 R1 \& \* e9 O! V
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;; Initialize the display by giving the global and patch variables initial values.
# k { `1 s5 N. O) q2 e;; Create num-cars of turtles if there are enough road patches for one turtle to
& N$ V1 v0 M: O% E( J;; be created per road patch. Set up the plots.) g6 O u: \! _, k, V7 j
to setup
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5 N' Z- W+ t U; r% g setup-globals
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" M) Z& P- w* P/ h1 Z" U- z: A/ Q ;; First we ask the patches to draw themselves and set up a few variables" K$ n8 n* w/ U$ b% B2 P
setup-patches# l- g- \( P0 P. z, v
make-current one-of intersections+ K. E; a& I) i' e
label-current
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3 G1 e L( L, I set-default-shape turtles "car"
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# L% ~8 |" e3 V, o1 q4 ] if (num-cars > count roads)- i$ ^1 B3 k- w" s# i- X4 u
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user-message (word "There are too many cars for the amount of "
/ z1 v* m" q6 Q+ q' ` "road. Either increase the amount of roads "' O/ J r) b2 y/ O' F
"by increasing the GRID-SIZE-X or "- n2 l' w8 }/ {6 d N
"GRID-SIZE-Y sliders, or decrease the "7 k0 P( V# m4 X' P+ C& x! T z
"number of cars by lowering the NUMBER slider.\n" e# v q" q) @
"The setup has stopped.")
3 I, E& I7 _/ [% H9 W9 J2 ~ stop" m0 c% T' y5 P, V- v/ o
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; W2 p4 s8 g9 ^/ ^% ~# Z( @ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- E& ^. [ o+ l0 j
crt num-cars
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setup-cars
; z* l+ c# E( t5 ?3 z6 A/ _ set-car-color
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;; give the turtles an initial speed4 @( T6 u( N) Q2 p& @
ask turtles [ set-car-speed ]# E1 {$ X$ Y5 h% l+ ]
( x4 G8 V. b6 r- D reset-ticks7 b- \/ P9 U! [' j: n
end6 k) E, A1 q7 i7 o8 E
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;; Initialize the global variables to appropriate values
% X% v5 ]9 B7 h7 c5 Nto setup-globals
# t' B3 K- W, w set current-light nobody ;; just for now, since there are no lights yet
6 s S/ O, g! s$ G. S* {! ]! g' T set phase 01 F4 R0 K& \2 s r: A! z+ e
set num-cars-stopped 08 q$ M/ ]- ?: ]- U
set grid-x-inc world-width / grid-size-x
& Q5 w8 s4 F G+ j. g: @+ ~1 E set grid-y-inc world-height / grid-size-y, b+ L8 z9 T; n/ o3 w; G7 S
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& w: k% T+ P# U. `$ h' D K
set acceleration 0.0991 Z& J6 |+ ?+ B/ x# p1 I @
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# |. B! G; Q7 u, w1 v8 \% C;; and initialize the traffic lights to one setting
- |0 T! g" A9 h6 f4 o5 zto setup-patches
5 F0 S' F& V, s" B6 `$ E3 _ ;; initialize the patch-owned variables and color the patches to a base-color
: ~9 L9 f! s* Y/ ?8 A. Y ask patches
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4 n4 C/ z9 [4 ? set intersection? false& k/ W% }; ~0 Z- i
set auto? false5 ^/ g1 ~: r, c7 ^. D/ @4 l7 V# r8 v
set green-light-up? true1 J5 B+ e2 L, _; c2 G
set my-row -17 C X0 @. c9 z, \/ j, o
set my-column -1- R) B' d2 S8 N
set my-phase -1& h3 N- g9 f- I$ j4 V, e& `) i
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
3 ]" \$ [7 K. m0 O& X& A( l* u/ Y set roads patches with
- T F4 T- A5 C- u" l7 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) r! Z+ x# x3 p: j/ p( D9 C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 L/ d, \, I1 Z set intersections roads with: P5 e) @' V" A) J1 ]& Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ D! }7 J( u8 N( l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! W- D/ ^# @6 s; ~" }: W ask roads [ set pcolor white ]2 M0 h& W- X' |4 {" G) x; x! v
setup-intersections! p, V2 q; g' h* B4 w7 H6 y5 S
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其中定义道路的句子,如下所示,是什么意思啊?: D9 f V9 p% m: T7 H4 |5 G
set roads patches with
9 ~; M( W8 ]5 g! w% R$ ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ m' o0 g- V1 Q( \0 K6 r) P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. s+ R$ H& T# U+ y8 t
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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