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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。5 e% ?& Y4 d" P( p+ n2 [
netlogo自带的social science--traffic grid这一例子当中,# M- z, T$ F/ w) x0 y0 _/ m
globals
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) A8 ~0 A' b$ K grid-x-inc ;; the amount of patches in between two roads in the x direction: A( `. K0 V* g# @! `! B3 o
grid-y-inc ;; the amount of patches in between two roads in the y direction
( {# d/ d. y6 I8 [4 e1 R acceleration ;; the constant that controls how much a car speeds up or slows down by if
) Q$ Q; K7 v' j H ;; it is to accelerate or decelerate" a3 k( Y4 p U: W' t: L
phase ;; keeps track of the phase
5 @) u0 s9 e* s& H# o num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% y. G/ p4 q0 _- i' j. C
current-light ;; the currently selected light2 w. K I- a9 I
8 G/ E& @+ d' E ;; patch agentsets+ t0 H5 i! l* ~6 ?, @9 p( L0 u- |
intersections ;; agentset containing the patches that are intersections
|1 D5 G/ R: A& {: r) P roads ;; agentset containing the patches that are roads3 H" \! F/ A4 h( a
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turtles-own M' v9 p$ M% F& Q4 w' ]
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$ `; @% K/ p+ @3 F$ o& r speed ;; the speed of the turtle1 i$ D- t# s3 X+ U1 {# b% {
up-car? ;; true if the turtle moves downwards and false if it moves to the right2 m3 [! P/ u7 q3 D ] L4 x
wait-time ;; the amount of time since the last time a turtle has moved
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- R- [/ @: \* q+ G, H+ Opatches-own
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intersection? ;; true if the patch is at the intersection of two roads
6 t: w- W' ?1 H$ j1 z' S green-light-up? ;; true if the green light is above the intersection. otherwise, false.
4 O8 o& G& d$ c1 }0 F* F ;; false for a non-intersection patches.
0 X! e n% k2 r3 d my-row ;; the row of the intersection counting from the upper left corner of the
5 N, y4 w% M1 l3 z# ^9 f ;; world. -1 for non-intersection patches.2 l" E8 D: \. G3 b- u
my-column ;; the column of the intersection counting from the upper left corner of the
. u" p$ l& _# s% } ;; world. -1 for non-intersection patches.
" |6 f# S2 T* s my-phase ;; the phase for the intersection. -1 for non-intersection patches.- U- _4 F: w7 S
auto? ;; whether or not this intersection will switch automatically.* q. l2 J) p! G" C% p
;; false for non-intersection patches.) Q4 {9 n# n ?
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;;;;;;;;;;;;;;;;;;;;;;( K9 d9 v2 r, I6 J( b
;; Setup Procedures ;;! u# e; |9 h* M+ h6 ^( [
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;; Initialize the display by giving the global and patch variables initial values.
% N) K! t- _( w+ T;; Create num-cars of turtles if there are enough road patches for one turtle to8 m. v5 D0 r+ b
;; be created per road patch. Set up the plots.
/ G* N3 T5 H6 H/ E4 }8 X9 P4 N3 Vto setup
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- w+ S; p' x+ G8 i7 ~! S% u6 B setup-globals- A( Y; Q6 ]0 X8 g- p& u
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;; First we ask the patches to draw themselves and set up a few variables) l6 Z- ? |) _
setup-patches B' A# n2 q* a( O
make-current one-of intersections
- p2 E" Q6 e) S# a label-current
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, q' s5 J# z: X! F8 `3 t% a& a set-default-shape turtles "car"
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1 L Q: x& c6 k7 `: v% i if (num-cars > count roads)/ Q; [, E' R" k G, u
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, Z9 [4 w. s4 s& K& m user-message (word "There are too many cars for the amount of "
8 q$ w& d j* L! |/ V; \8 P "road. Either increase the amount of roads "( l8 X/ G' N6 w
"by increasing the GRID-SIZE-X or ". i: N+ t& Y1 Y+ ]7 U4 \& P
"GRID-SIZE-Y sliders, or decrease the "6 ^4 C- }! w# c
"number of cars by lowering the NUMBER slider.\n"
$ O% D: {8 g7 w* b5 c5 k "The setup has stopped.")
* U# v, ], ~$ B. V; S% e stop
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$ x6 e8 H& S' _$ g' n% J1 v7 U# J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
7 N' t% u9 o9 R7 K# h( } crt num-cars1 z# ?$ ^2 z& A# k# y
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0 B7 W7 |: {. q0 I. Z" c setup-cars
( w) \9 [# G4 O; X. X set-car-color
3 X1 H) W' x& B# ^3 p/ _" u record-data
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;; give the turtles an initial speed9 w& c$ M3 h6 i
ask turtles [ set-car-speed ]
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5 K4 P! E- }) g reset-ticks ?" v6 Z8 ^+ o
end8 t- s+ ~9 W- o h1 e1 V
1 @* m2 N) _) i- x. ?- y;; Initialize the global variables to appropriate values
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6 @& C3 i$ i3 H' Z; a set current-light nobody ;; just for now, since there are no lights yet1 k# M: E) y( x0 S. _$ y
set phase 0
) z" T! L w4 S2 |4 A! r set num-cars-stopped 03 e' p% e8 i* y4 h1 N0 R
set grid-x-inc world-width / grid-size-x+ s- u, [2 O" i( c* {- y* t
set grid-y-inc world-height / grid-size-y
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, K, S& }& p" S i ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; `& L! u q! w. K7 |7 o
set acceleration 0.099$ R* J8 K p7 a d/ g
end! I1 S# Z1 _- g1 ]
' Z/ z/ s6 F5 Q6 Y4 J1 X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, o6 I, i- d% s0 x5 d# D# e% C;; and initialize the traffic lights to one setting
# M# E3 {6 C6 l( d* K. R% s2 Q" @to setup-patches ^* J; H7 D& S( r, V1 s* x
;; initialize the patch-owned variables and color the patches to a base-color
. Z: l* G( ?0 M+ @3 [; W7 K6 d& O ask patches& a7 j# L7 T: l7 }7 f1 c
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5 v7 ?& y3 S7 a2 R* ` set intersection? false
9 P7 L9 ~- `, `- B6 n& F set auto? false7 {; o9 o3 ]% r& M* e
set green-light-up? true
8 p4 d) U" {6 F set my-row -1
0 B; d Y' K( Y3 d9 I, x- ~8 [ set my-column -12 {5 j2 |# U2 g# M: b! v" I
set my-phase -12 s! Y; w6 \$ @+ \
set pcolor brown + 3) `5 w% H( s3 r2 k! \' j
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;; initialize the global variables that hold patch agentsets# k# A9 |% Q* ]3 B3 T
set roads patches with
* l& S3 P/ T3 [8 ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! `2 t/ ?3 R2 d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 w1 v6 E8 i. ^7 X5 l$ I$ W set intersections roads with6 n" h. i/ N8 {- c7 b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, K3 o) w- i% ]/ x' J- \( m
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- G/ W! m+ i6 G* E& E9 H
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ask roads [ set pcolor white ], B( m1 E9 b, l8 Z5 r. C
setup-intersections8 [% e5 ]8 g& M2 f' |; L
end
/ F m' F U$ e+ Q* n8 n v其中定义道路的句子,如下所示,是什么意思啊?0 q0 c- M% ^0 ]6 E' |) g
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ E, g* x, O3 [' q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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