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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。
) K, B, r- X( O, T, Qnetlogo自带的social science--traffic grid这一例子当中," y: ]; H( O! l9 U
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0 M5 a* _$ T( W2 \+ g+ ~ grid-x-inc ;; the amount of patches in between two roads in the x direction
, n8 c I- }2 Y1 E8 u grid-y-inc ;; the amount of patches in between two roads in the y direction! f( r3 b7 d. X0 g9 C+ H1 Q
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 j; R) L9 _& E7 I+ k
;; it is to accelerate or decelerate
, E s: C( d0 U) p# I phase ;; keeps track of the phase
+ w, q$ V! @; g% I: a num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 W) D$ x5 i) z+ N8 N4 } current-light ;; the currently selected light
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( T3 o" @ ?" w; Y" d ;; patch agentsets
( q" z+ g2 J$ t+ S' }* | intersections ;; agentset containing the patches that are intersections
; b/ w O& n1 q3 C. Q roads ;; agentset containing the patches that are roads
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turtles-own
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7 p. y9 T# U+ }+ j* v6 p speed ;; the speed of the turtle X* x+ L0 z/ D; @$ v( N i; j
up-car? ;; true if the turtle moves downwards and false if it moves to the right& w* Y; J R* g
wait-time ;; the amount of time since the last time a turtle has moved
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! i4 @. n; `5 f- rpatches-own
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intersection? ;; true if the patch is at the intersection of two roads4 ^( D) b: [! E( _+ C0 u
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 p/ S" L) W8 B' Y# Q* \8 } ;; false for a non-intersection patches.
+ K7 H0 B" G R; P: g U my-row ;; the row of the intersection counting from the upper left corner of the* ]* C/ i/ S0 a$ d9 s$ t; c
;; world. -1 for non-intersection patches.
3 L5 c5 r; m* T! _* p my-column ;; the column of the intersection counting from the upper left corner of the
! G) W0 u" p+ a7 G, p ;; world. -1 for non-intersection patches.4 f: v- k6 y- c: f3 b& h
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: N7 u, A$ I( U! g/ J
auto? ;; whether or not this intersection will switch automatically., p' `) J* M2 g
;; false for non-intersection patches.; I) o; P( H$ ~( K% Z! L y
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;;;;;;;;;;;;;;;;;;;;;;% A/ ^/ L7 E; g1 Z' f+ v8 }4 ?
;; Setup Procedures ;;7 Y* s- w6 q# r" ?. `* h; }
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.0 m" x8 ]" e) a0 o
;; Create num-cars of turtles if there are enough road patches for one turtle to
: W4 ~" Z+ t+ D: S, R E;; be created per road patch. Set up the plots.
8 H% z) B# T% t( I: [to setup" F) C1 H' c. b
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setup-globals. T& x$ }' v" F# S
& J8 i5 |& P9 Q3 Q$ p ;; First we ask the patches to draw themselves and set up a few variables
; B& |* |7 i6 R* O: |' b setup-patches
4 _6 F9 C! l/ S' I1 J make-current one-of intersections9 g- g' x, `/ f, e2 c6 v
label-current7 C2 f$ r: \) M( \) P
# H1 D* S! c; k- Y5 j set-default-shape turtles "car"
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if (num-cars > count roads)
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6 K* G! ~; a; h2 e& l$ S5 V user-message (word "There are too many cars for the amount of "$ Z; `% n4 u. x) W1 n/ b" M, H, S
"road. Either increase the amount of roads ": d: N1 T1 W! s0 }9 b
"by increasing the GRID-SIZE-X or "
( n! Z- _' K3 g# D6 m "GRID-SIZE-Y sliders, or decrease the "
; c* ?( Z9 g0 P% W2 a( r- P) L. U "number of cars by lowering the NUMBER slider.\n"5 D1 i5 o+ L' M
"The setup has stopped.")2 [; K7 K* r$ B$ \
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 b9 Y) V( Q Z+ g: f# R% x crt num-cars
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3 n4 c) |# O( |6 c setup-cars
8 l5 q# h/ c: X set-car-color0 F* e( b w; E+ B
record-data
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;; give the turtles an initial speed
, @- w( c5 g5 Q( o6 i# ] ask turtles [ set-car-speed ]
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reset-ticks4 X1 _0 C3 X# T3 f! V5 {" ]- ~
end
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;; Initialize the global variables to appropriate values5 w R; ^' g' N2 X) Z4 t; u
to setup-globals
% q8 W/ k+ {. ? set current-light nobody ;; just for now, since there are no lights yet
6 y& _& ?8 m- Z& r+ s" ?, i set phase 0
) L) Q' Q/ o" N* J$ v set num-cars-stopped 0
4 G& I S4 C4 ~ set grid-x-inc world-width / grid-size-x
9 b6 s, N8 g8 G0 f& J" j7 d set grid-y-inc world-height / grid-size-y' N6 S6 c5 F8 w
: K2 K S$ v8 r5 W1 W+ N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 F( p. C% O" w3 V) k6 i- z# M set acceleration 0.0998 l4 D3 `) |- o
end% z' Q! u% s/ a* L' O% t
( r N* c1 T6 c+ {+ Y1 Y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 p% @- l1 ?+ s0 k% }$ V
;; and initialize the traffic lights to one setting
. Y) G. J3 i7 ]/ f$ Tto setup-patches' [! ~( Z5 H. }
;; initialize the patch-owned variables and color the patches to a base-color6 H" ?6 r f: Q7 _8 W9 y
ask patches3 v3 D. r+ w) r" F* [ q
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set intersection? false" X# Y5 p' L- D Q; f6 F
set auto? false
8 a" w$ ^9 x, T6 [; Q' j" z4 l set green-light-up? true
u. C& V, [9 Y. B% t set my-row -1( d. D C+ i& o& E" c; z; ?+ s
set my-column -1, Q7 Y. r$ ^% M+ E1 m
set my-phase -12 c* E! _' r1 T7 M
set pcolor brown + 3) o0 t9 M7 V3 D, X# z7 F% ]7 ^6 f- G; Z( ?
]
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: I0 w& {5 }) m |: ?8 a- q* F" f% G ;; initialize the global variables that hold patch agentsets& D& T8 B( w5 c; B
set roads patches with
y J/ b3 G. }" h+ b7 G; R* f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 U S0 G- P2 Z# X3 n( b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 P5 N% d3 i$ \ set intersections roads with7 f( S" }+ y* e x7 K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, q+ O2 E/ `, t7 R5 y N# l" ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' z9 t6 a. Y& h$ `
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ask roads [ set pcolor white ] D$ v. i; M$ d
setup-intersections7 ]8 k9 R, l- }6 {" F/ E
end
$ w5 _, s! D$ ]% w6 K5 G. W其中定义道路的句子,如下所示,是什么意思啊?
# }! R! u* L0 G) C( l set roads patches with
. _; p4 R/ l+ W* N2 `. H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& p7 T) Z: j. ^# _/ u4 J* o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ s0 \/ u$ |# c; 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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