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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。" l) {# X g* h9 {, z: O0 o9 i
netlogo自带的social science--traffic grid这一例子当中,, ]% I* W' h1 O2 O
globals
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9 G% b8 g2 ~; j& a: r grid-x-inc ;; the amount of patches in between two roads in the x direction* C, p* V6 L% d1 k) M& B9 @
grid-y-inc ;; the amount of patches in between two roads in the y direction' p; {& Z; d9 G8 b @$ U
acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 r0 T8 @% G q; m( f& b( _2 I ;; it is to accelerate or decelerate
* i* @6 {1 v' N$ V phase ;; keeps track of the phase: n( ^; Q8 h) I% e. s, C6 Q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- p5 M/ K/ P% M- s5 f! _- Q4 f
current-light ;; the currently selected light
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, k2 l \, c$ }4 I% T$ B: w7 a' v* ] ;; patch agentsets/ ?6 f4 O; I. ]2 k. ^0 M% O% S
intersections ;; agentset containing the patches that are intersections! i% \. _. Z: X3 P4 f1 ]& D
roads ;; agentset containing the patches that are roads3 f9 W& U+ G! i# V% E1 P! q% f" E
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turtles-own+ {) d! y, B- s$ e) `& N
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speed ;; the speed of the turtle: w6 l2 K5 u1 K( @7 G3 n% A* A
up-car? ;; true if the turtle moves downwards and false if it moves to the right! A0 U4 d0 Z c+ d7 J. ~
wait-time ;; the amount of time since the last time a turtle has moved
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, @) }) h# J5 N8 ?9 z+ cpatches-own
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9 ^8 R7 }6 y4 N1 G0 ]) I& _ intersection? ;; true if the patch is at the intersection of two roads- ?* _- s( I6 \: u3 f* E
green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 _* A- L, G( d T
;; false for a non-intersection patches.
# M* \( L3 y; [) |' i my-row ;; the row of the intersection counting from the upper left corner of the
?! ?1 u, ~6 }. [ ;; world. -1 for non-intersection patches., W8 b* Z# m/ u9 P: F/ S! v( C( s
my-column ;; the column of the intersection counting from the upper left corner of the( c {1 Z4 A z8 K1 {
;; world. -1 for non-intersection patches.
& B; U$ k" L: o" p! b( H% o0 D my-phase ;; the phase for the intersection. -1 for non-intersection patches. ^7 P1 I9 }* W. W. ^
auto? ;; whether or not this intersection will switch automatically.
) b7 c4 }7 _* c# ^' x ;; false for non-intersection patches.2 D" v& H w. n) @! H/ J9 @; Q
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;;;;;;;;;;;;;;;;;;;;;;0 D0 ^' ~$ {) C# ]8 ?9 V
;; Setup Procedures ;;* C: C' q7 C, e, r' c* C c, M
;;;;;;;;;;;;;;;;;;;;;;
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8 W) [- v+ s5 x+ c, F t! k;; Initialize the display by giving the global and patch variables initial values.* z7 V7 h8 J, l0 o0 b; ?6 e1 ]
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 [ \) w8 p0 E4 x q9 r;; be created per road patch. Set up the plots.# L& B8 m; o+ d0 n/ M
to setup
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setup-globals. s, ~; I1 s9 Q' s
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;; First we ask the patches to draw themselves and set up a few variables
+ v; o0 L2 p' o9 q9 w; |5 k setup-patches" L1 m9 W( B- E) d# g l0 e2 {
make-current one-of intersections$ }/ W+ o5 J' X4 m
label-current, Z# L8 p' H% b+ w) O- }/ }# H
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set-default-shape turtles "car"
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7 w, Y6 a0 J$ |9 P5 j if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "$ a- D. ?3 c# v$ @4 H
"road. Either increase the amount of roads "
0 g/ g/ o% ]+ _1 s+ L "by increasing the GRID-SIZE-X or "
2 ^' q! j" G) |0 a3 b; e. v7 ]' O "GRID-SIZE-Y sliders, or decrease the "
7 W# k+ z+ [/ x5 C6 m3 E$ w "number of cars by lowering the NUMBER slider.\n"& T( C/ b( r! N: J4 M% v2 @+ P; C* Y r
"The setup has stopped.")* K; b: s" k" m. w
stop1 v7 p! [/ x: [% s; \
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/ R8 o h ] v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ |1 Y+ T5 {! {; Z) c( v3 w* {9 @
crt num-cars! v5 ], y. V8 t; i+ x6 `+ Q5 J3 ^4 `, e+ K
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setup-cars1 N( W5 k# J# I: y
set-car-color; G: X. H9 A0 B0 ]
record-data6 G+ o ^ u& w/ o/ Y
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;; give the turtles an initial speed6 R3 e% a6 H6 U5 \
ask turtles [ set-car-speed ]
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* W3 @9 q: t8 O# }" }3 e: V reset-ticks
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;; Initialize the global variables to appropriate values
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. O# ^( w0 v8 ? j; Z set current-light nobody ;; just for now, since there are no lights yet* h* C. w5 |/ ^: S) i/ l
set phase 0# V0 d4 a( T* _, {# M0 P
set num-cars-stopped 0
; c, O% X8 z; u. l( Z set grid-x-inc world-width / grid-size-x
0 s5 U- ?2 r! A& r. V set grid-y-inc world-height / grid-size-y' d9 h6 @$ P' p! p. b) c
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ O3 m6 A$ Y$ g! e& y# I ` set acceleration 0.099
8 J$ W( m& p4 s' [7 T! ?/ i9 ~end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& W/ G" l: v# J* O( m! ]8 \5 R! G" C/ k;; and initialize the traffic lights to one setting- w+ F! y7 i$ M a8 l6 U& P
to setup-patches* W, p7 z2 |( x- ^% R: q) u u
;; initialize the patch-owned variables and color the patches to a base-color
$ o0 A& E U( Z2 G ask patches
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, L4 ]6 U; ?+ E+ n. c" p set intersection? false
2 i. [+ c h! s2 L set auto? false! x# P7 P! Q& S8 I7 m
set green-light-up? true) u8 s, C. s q; b
set my-row -1; S, r8 F; w% q
set my-column -1
; r2 Q3 |5 T/ v/ P set my-phase -1" H1 f& S R5 ^! k& _1 F0 V
set pcolor brown + 3 \- I. y. F `) b; b
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8 }, F3 M O4 F% J+ C8 x* ? ;; initialize the global variables that hold patch agentsets/ K0 E) |' u3 o; j1 Y
set roads patches with
$ z( t9 L0 Y: j1 u# J2 ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( ^4 b- s' _ M; K) q4 x0 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 h3 G P; Z) L
set intersections roads with/ m, r! X! O7 E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ ^7 _$ ^, H" d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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5 \$ q: K7 a$ O& j9 n ask roads [ set pcolor white ]3 W) O# _- O1 s1 s# z4 ~! N
setup-intersections% G& s8 o/ H& }7 o; {; R
end
9 T6 L) G- p/ |2 t: P* j其中定义道路的句子,如下所示,是什么意思啊?
: V6 I3 G' x! P& l set roads patches with4 l2 V4 A- U! S: r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' M% V9 [0 _' P* i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# ~& O2 ~# Q' i7 y, d5 u
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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