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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。
" H9 d- E6 |: v0 f2 Y& b& hnetlogo自带的social science--traffic grid这一例子当中,% F6 B& w+ y/ H$ H, U- d: g; W
globals$ E; W' M+ U# ~- f" e4 X# A( n9 r
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grid-x-inc ;; the amount of patches in between two roads in the x direction- T; s d% D& W% O8 o7 r1 b
grid-y-inc ;; the amount of patches in between two roads in the y direction3 ^# L0 L0 ^2 |9 N" H3 v- v
acceleration ;; the constant that controls how much a car speeds up or slows down by if7 R8 C9 y4 K8 o1 L" O4 M6 a
;; it is to accelerate or decelerate8 v5 x' e7 c/ Z# Q
phase ;; keeps track of the phase% X: z4 B! {! O4 l+ z
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 ~6 D3 a1 d: V F* C$ V
current-light ;; the currently selected light- Q& M; f. x4 J
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;; patch agentsets
: y7 q5 d+ ?5 d intersections ;; agentset containing the patches that are intersections0 P& @3 z& L x9 S: p! M
roads ;; agentset containing the patches that are roads" H5 X. s6 ]0 Q& S0 }6 A
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turtles-own; X# I1 Z9 b- m
[
& [3 s+ @- O+ P. X" U. V8 U speed ;; the speed of the turtle& R$ F' O) s8 U/ l2 \
up-car? ;; true if the turtle moves downwards and false if it moves to the right
8 Q' j% D, u$ O; N8 Z4 K; P/ [, {! m wait-time ;; the amount of time since the last time a turtle has moved
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patches-own' T8 R+ e Y* @# y
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' d0 S. ?9 g. h0 p, x intersection? ;; true if the patch is at the intersection of two roads
$ t2 W* q% ]# q7 Q2 z/ c green-light-up? ;; true if the green light is above the intersection. otherwise, false., _" E- P7 ]5 E6 U. I) @6 j4 t/ k
;; false for a non-intersection patches.1 m+ E# |5 k. @
my-row ;; the row of the intersection counting from the upper left corner of the
) w0 m- N! \& @5 [ ;; world. -1 for non-intersection patches.5 e/ Q& `3 t3 q& `
my-column ;; the column of the intersection counting from the upper left corner of the3 b, O1 E* k* k# V( P# I: G
;; world. -1 for non-intersection patches.9 B9 x0 P, D: i( r* U \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- Y' K: S: C) w
auto? ;; whether or not this intersection will switch automatically.
$ l9 z* ?! U/ P7 t; l3 } ;; false for non-intersection patches. J" _9 a) j& E/ q6 t
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;;;;;;;;;;;;;;;;;;;;;;1 \. T- C$ _4 U7 E
;; Setup Procedures ;;! I1 \' C3 q( Q. c9 k r3 G# _
;;;;;;;;;;;;;;;;;;;;;;4 S/ l; }% O4 B$ P
$ D8 |6 l' B/ A& z* M- ^ L4 N;; Initialize the display by giving the global and patch variables initial values.2 G. \7 i( q3 z( t
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ |3 }( x+ }, p+ y8 F) @* f, ~;; be created per road patch. Set up the plots.
9 U6 D1 j" o" a7 C$ c0 B+ l! Bto setup* X5 x" ~) P9 w+ l( D" M, r! \5 c
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setup-globals4 v# `; `! b8 Z% ]" m5 z4 g
) J9 E" v/ f, M; M9 X2 R ;; First we ask the patches to draw themselves and set up a few variables+ \: M. P; @, y2 g
setup-patches
0 `5 {- q& c( {3 d0 z make-current one-of intersections) y9 K5 Y1 S: D! A( }
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)/ P3 u$ b5 B8 K' f, ~
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user-message (word "There are too many cars for the amount of "4 P$ K# C/ r" E0 F. u
"road. Either increase the amount of roads "0 m) k% K4 o6 n" B
"by increasing the GRID-SIZE-X or ". t; c2 g* @; ~" L1 k$ c
"GRID-SIZE-Y sliders, or decrease the "
! P" s5 U" Z/ s& m: p4 e "number of cars by lowering the NUMBER slider.\n"
4 h, C! E6 d: Y. Y "The setup has stopped.")- `8 p8 X$ E" `! A3 a
stop
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% V2 J1 M/ y$ G/ b) H( W& D ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 O- y) E; @1 D& i, E$ y6 O# H/ I crt num-cars
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7 e- d$ u) W( h9 d* i setup-cars0 N, N% b# ~$ X6 Y/ S6 T
set-car-color
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$ [7 R4 x7 D$ x ;; give the turtles an initial speed9 E# i: E# O/ A4 m$ D, q/ H
ask turtles [ set-car-speed ]- C! X& H' l! S
6 N* r$ x3 P+ L& z" m6 G7 V reset-ticks4 e: q& V3 x. P# }+ R
end
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( Z9 \( J$ {5 J5 @% B1 a9 s# x/ d;; Initialize the global variables to appropriate values# t9 R6 G% q, G
to setup-globals
! k. h U& s* e1 U: B6 Q+ H r set current-light nobody ;; just for now, since there are no lights yet
2 U) n5 S# M/ y0 P3 n5 |+ W' | set phase 0* X* k3 _* J$ Z$ U k) l, a
set num-cars-stopped 06 L9 a, X% V* |
set grid-x-inc world-width / grid-size-x
! ^ f, w8 J' I8 z j set grid-y-inc world-height / grid-size-y7 \2 @- w8 h8 U1 r, y& U. H
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' Z- ?% [, I& P$ a- i set acceleration 0.0996 `( }* L4 ^3 Z% |! B8 q
end8 M; q2 K' u. Q- r8 u% D$ K
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ k# g5 c: E' e! R1 n
;; and initialize the traffic lights to one setting; e% z( {3 \# }% B. C. J% N
to setup-patches+ F6 g* ^9 {6 s, m2 v
;; initialize the patch-owned variables and color the patches to a base-color8 K9 d6 j$ n; d$ R2 [' L
ask patches: B+ y! y' G, t. @1 n
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set intersection? false
4 h' b" O; X6 ? set auto? false
: P% G2 K* o- G' w set green-light-up? true
, Z% l) W7 h$ W7 ? set my-row -1! p, J6 i2 @% j" T+ W" R
set my-column -16 ]; c: k* E6 t
set my-phase -1
& H8 a4 P# s4 k; [* B+ u5 Y! O set pcolor brown + 3
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9 r* g$ x3 [, ` ;; initialize the global variables that hold patch agentsets
1 |$ E3 X4 z' c) N6 w% V8 S; U set roads patches with# g% }& Y6 x8 ^3 h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 i: O5 Z, s& m3 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], H& u& f+ y* s
set intersections roads with
I( d( _$ k% m1 {3 Q- O& \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, G' _% k4 c2 Z9 U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 f/ v1 i- }8 K+ d; u! e; l5 S5 e( p* k
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ask roads [ set pcolor white ]
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3 u1 _1 N& Q/ _. S; @4 m# H其中定义道路的句子,如下所示,是什么意思啊?, T; S9 r& G# x w: g Q
set roads patches with0 w) N; w0 r% J8 R) L r( _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 ?2 U9 `' [1 f/ k' n7 Y4 f* P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 f5 S8 v( `( q* {1 z2 ?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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