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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。3 `) K! I# P- R3 @) q/ y
netlogo自带的social science--traffic grid这一例子当中,
5 Y) M9 D4 l+ q4 ^; wglobals
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- P/ n, H# J4 O: _. f0 F grid-x-inc ;; the amount of patches in between two roads in the x direction
) q" t9 R& N3 p; c grid-y-inc ;; the amount of patches in between two roads in the y direction
( w4 x& M' k- a% W% z acceleration ;; the constant that controls how much a car speeds up or slows down by if
) F' s/ E+ r3 L) s! y0 t0 L* L. \ ;; it is to accelerate or decelerate3 O7 h% }8 E2 y/ i
phase ;; keeps track of the phase
5 W3 x% {" N# O! J8 N2 v num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, C f1 }& w: P8 F current-light ;; the currently selected light( Q% g% I4 s$ h* |, V% j0 m! l; n
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;; patch agentsets/ C* U7 E% x+ m% h
intersections ;; agentset containing the patches that are intersections+ ~6 J, c, d4 w& N) m7 S" e
roads ;; agentset containing the patches that are roads. g( K" p8 Y& s. g8 `
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6 N8 m& f* S$ I" }- _turtles-own e1 c, P# K6 I4 d
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7 t7 w2 b2 N$ I' ~ speed ;; the speed of the turtle6 e$ @6 O, D8 A* D
up-car? ;; true if the turtle moves downwards and false if it moves to the right3 z8 |3 F6 c* T, A
wait-time ;; the amount of time since the last time a turtle has moved3 W; X# e& o. }7 p+ E% H
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! s( \& [3 }- {8 |4 s, i. j# }0 \patches-own& W8 I' k7 D. Z2 v; }
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5 M w# S1 ^% _0 X7 s" @4 |. S& V intersection? ;; true if the patch is at the intersection of two roads
$ |# d( v) N, G o' h green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 D6 p h; L3 l
;; false for a non-intersection patches.% e8 h) K$ M' V4 f( Z
my-row ;; the row of the intersection counting from the upper left corner of the5 j1 x: P+ E* n% E/ P
;; world. -1 for non-intersection patches.5 D/ r0 ]( ^0 H4 J% P1 S0 c
my-column ;; the column of the intersection counting from the upper left corner of the, {7 n, ?6 f$ J
;; world. -1 for non-intersection patches.& _# U5 \! a) S4 p8 ?3 B
my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 t C' l+ D3 e+ k7 V5 W
auto? ;; whether or not this intersection will switch automatically.- ]# \% S, x+ q- d; M$ G' m
;; false for non-intersection patches.2 O+ v5 F h- z9 C
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;;;;;;;;;;;;;;;;;;;;;;, T$ E6 q9 q2 s" s* Q$ X$ S; q% o
;; Setup Procedures ;;# q# x+ \3 h! s5 n& R: ~+ ^
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
$ N1 i. u+ a R7 Y6 Q7 u" O. V% c;; Create num-cars of turtles if there are enough road patches for one turtle to
5 c, e. ?. z, k# |" r6 o;; be created per road patch. Set up the plots.
6 [& W3 c! D6 @4 P8 ^7 Gto setup
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setup-globals
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; `" |1 ^* K) b( ?- o3 D. L ;; First we ask the patches to draw themselves and set up a few variables
3 c$ E9 f# c3 ?9 M5 ?+ G8 z. r- t setup-patches+ ?/ _- M& D* L2 v% c
make-current one-of intersections
1 o. V& R) M2 C% r4 K9 ~ label-current
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) L j$ Y" ^4 r8 M& p set-default-shape turtles "car"
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if (num-cars > count roads)% O: R! }- P! \; H5 L* A
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user-message (word "There are too many cars for the amount of "
: |" e! ^7 Z0 } "road. Either increase the amount of roads "/ H" ?: R% |2 h. _( ]5 c5 ^
"by increasing the GRID-SIZE-X or ", { f/ a9 ?9 J9 Y; M. X9 \
"GRID-SIZE-Y sliders, or decrease the "
" b: X, j1 x1 | "number of cars by lowering the NUMBER slider.\n"
! C; s4 ?& Z( W. R "The setup has stopped."); T" |1 \- g/ l1 }7 v
stop5 [# B- b% M- x7 y, ^
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( O+ _1 ~9 n2 | d2 O' c$ \
crt num-cars
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' s$ J3 Q. V! e3 X$ k setup-cars
! u7 s( @$ G; I% p' v set-car-color
7 ^% U) t2 w Z- V4 Z: [4 c record-data
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;; give the turtles an initial speed* J6 V2 `# ~9 C3 n
ask turtles [ set-car-speed ]1 n3 @7 M0 V p- W* H8 E- O( _& ^" j
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reset-ticks
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;; Initialize the global variables to appropriate values$ ^' G, L3 j5 J0 L7 A! j
to setup-globals
0 P3 U: `% }4 o( l( b set current-light nobody ;; just for now, since there are no lights yet5 [( \7 I" e$ G# W; c4 g
set phase 0
( F" _- v5 W! a1 t set num-cars-stopped 0
3 D& D7 S) x6 S7 e |. W set grid-x-inc world-width / grid-size-x
5 r R g1 F3 t set grid-y-inc world-height / grid-size-y
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$ |8 y" U9 m; `' W& U0 L, N& f6 q ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 }- S% W# h' r. L+ q9 q
set acceleration 0.099
$ Y- K8 K/ T# l8 O1 Q) j5 fend
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! o- \3 J, r0 g/ k: F# D, R9 ^8 m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 ~% X0 w6 D1 _) w+ x% Z, w/ n;; and initialize the traffic lights to one setting+ P" t, V6 i7 q% r% Q( n) j: d8 ?
to setup-patches) L3 q1 S- |9 A& h5 S" V4 v
;; initialize the patch-owned variables and color the patches to a base-color
2 e% h* |# F8 n1 H# N1 u9 r; C& z ask patches
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set intersection? false, w6 E7 a1 ^$ q' W' [6 D% J$ C
set auto? false' R7 d0 y1 m% P9 Q, h; b: g: d0 {% j8 B
set green-light-up? true4 O' [2 L1 @3 E! o2 ?1 X
set my-row -1
% m+ }9 _0 A; ]) k set my-column -1
9 f* o/ \: {- v( D1 [& } set my-phase -1& d& y" I3 ^. _* r5 A
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets1 U l ]: }. R, i/ X8 }6 z
set roads patches with# N4 j F. M% c4 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 |4 a$ R `8 {& y O7 y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 J" y# }" L3 Z6 ?8 @
set intersections roads with( \, w0 [' _+ m, l. a3 y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 U9 t" g8 z9 z, [- T, u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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+ M. l+ p, ?2 J \; W* f/ a ask roads [ set pcolor white ]6 V6 ?. e$ n$ R/ ~: j$ m
setup-intersections
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, g& e" O, P( |$ A3 S其中定义道路的句子,如下所示,是什么意思啊?
$ w) w4 G4 i! t, ]' v' z. g; J set roads patches with
k. E" y4 P# t8 X. d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 ` A ]( L. a (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 q& R1 K5 L) S. z) }5 `1 H: ^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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