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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。
a: C- b% q* g% j" snetlogo自带的social science--traffic grid这一例子当中,: s8 A' _1 }* s7 [6 u
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 [# l9 y i3 @; `
grid-y-inc ;; the amount of patches in between two roads in the y direction0 O# ~9 `2 Y' b
acceleration ;; the constant that controls how much a car speeds up or slows down by if! i6 D- I% f) @9 c
;; it is to accelerate or decelerate* `# F: p/ M9 q$ R& I. M
phase ;; keeps track of the phase3 C/ v7 A, X: }/ q
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ t1 X2 {; h! |( e2 [ current-light ;; the currently selected light
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+ L* L9 Q: }3 y) `. m6 t' K G: y ;; patch agentsets
. J$ M; e* p* K+ W. j8 P intersections ;; agentset containing the patches that are intersections
2 t: N, T# O, e. N) v; R1 c& p roads ;; agentset containing the patches that are roads+ c* Y6 W) c, c# g
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turtles-own
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6 T b1 _% o, a7 y8 V speed ;; the speed of the turtle
9 |( F$ ^- h& m6 j up-car? ;; true if the turtle moves downwards and false if it moves to the right, [ _; |4 l& a! w8 Q6 _% [
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own4 {) b! \- Q y% }' i, k" v
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intersection? ;; true if the patch is at the intersection of two roads" [, k5 S: e0 p- U0 v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 w5 I$ X1 X! M6 w2 m, m2 ~" e0 b
;; false for a non-intersection patches.
, a! |/ ?- ]0 P$ r' J U' g my-row ;; the row of the intersection counting from the upper left corner of the
/ j- W0 C8 G. D; X ;; world. -1 for non-intersection patches.
8 d ]0 ?4 Z7 p4 A) U4 E% A my-column ;; the column of the intersection counting from the upper left corner of the
5 W! s, ~+ u% j- r ;; world. -1 for non-intersection patches./ S% ]4 [7 [4 Y+ w# u Q6 g+ J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! w0 P4 N# z9 l5 v/ M
auto? ;; whether or not this intersection will switch automatically.. f) }9 e! R. n, t
;; false for non-intersection patches.+ ^6 Q" n9 v. C u d
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;;;;;;;;;;;;;;;;;;;;;;
: k9 l# ^3 c* I8 J; ^;; Setup Procedures ;;
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" r6 ~' {8 @' @, \9 e- n* k: d0 w- b9 O;; Initialize the display by giving the global and patch variables initial values.; B5 v: ~3 E8 N' w: g8 s6 t
;; Create num-cars of turtles if there are enough road patches for one turtle to
$ l% s& F1 E' R2 j( J;; be created per road patch. Set up the plots.
& ~/ v4 V" t2 N: J/ |1 F" W) Q# Sto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables* e* I3 _, T6 j1 Z; L8 |
setup-patches
* g$ [# L$ G! s- \ make-current one-of intersections' I# _$ W7 X g+ i0 i
label-current
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set-default-shape turtles "car"7 r* l3 A, n }5 ?! l6 t$ f; E
! W' H4 C @( q" G if (num-cars > count roads)) p* K+ y6 T, ]$ j7 E3 i& w
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user-message (word "There are too many cars for the amount of "
/ C/ ]! ]) r, L0 Z "road. Either increase the amount of roads ", q2 b: m9 j% [2 b+ D* w! l
"by increasing the GRID-SIZE-X or "# u5 V. W7 C4 q8 T+ U6 Q- ]6 M/ u B& b
"GRID-SIZE-Y sliders, or decrease the "0 f8 K! a" j3 V5 y) b7 E" c9 `
"number of cars by lowering the NUMBER slider.\n"8 j( ]3 o+ s1 x, s% R
"The setup has stopped.")5 w0 T0 N- [. E2 E) R8 x1 t
stop" P" k8 Z" a0 {% h, O/ v+ Y. E
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; L( N7 L# I# W/ \$ g ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 a! K+ |0 G. }$ O
crt num-cars
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+ _) C/ ?/ B9 k7 m+ A2 A5 ^ setup-cars
7 I; E9 Z/ N1 S$ K: t% L. X( J set-car-color$ }( U! e& A; U) Z
record-data
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;; give the turtles an initial speed
* f) e8 V& g E, t4 g! G6 X5 n ask turtles [ set-car-speed ]
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reset-ticks
% q" d: n7 ?" A3 Q+ ?* K" p% J) o* qend
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;; Initialize the global variables to appropriate values
3 [' `* j J* qto setup-globals
5 L8 d# G$ B( c; C1 `" V1 I set current-light nobody ;; just for now, since there are no lights yet8 ]* d& P+ w7 U$ R$ T$ D; E
set phase 04 b* w8 k! `: o
set num-cars-stopped 0' U7 I$ K* C0 |/ i$ R
set grid-x-inc world-width / grid-size-x3 d1 h& q# ^ [" R5 _6 p
set grid-y-inc world-height / grid-size-y) _3 ?3 m6 _, [2 y/ M
3 F3 O6 w0 ?8 u ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ V' X4 V& i, V* n% X1 G4 K2 s set acceleration 0.0994 }7 d2 i4 U3 s) w6 ?+ w
end( Y& _/ q0 e0 f* ?6 U
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 e: i$ L- o7 w: X) J* l! [0 R
;; and initialize the traffic lights to one setting
( |0 }) b! }. Y: ~$ Lto setup-patches( q! z9 f0 ]' H! D! K* ~
;; initialize the patch-owned variables and color the patches to a base-color1 W- M; Q2 [) D6 @( H5 _; b
ask patches
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set intersection? false
$ T' W' }6 f. X, G: W set auto? false+ w! j2 I2 b% ]1 B2 z
set green-light-up? true! }+ l; i, r" B }
set my-row -1
5 _% A# p: I; ]3 o3 K set my-column -1
3 w) m9 O+ B4 {" a, K7 \6 [ set my-phase -1; E# \; ~8 X; k* w4 W' v$ [6 {
set pcolor brown + 3
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* w* o! `& n- K1 c. w- [ ;; initialize the global variables that hold patch agentsets
5 D+ i1 e( ]7 g" e7 d" Z set roads patches with2 P* t7 z* t& O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ ?' F% {# U0 [- M6 T8 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; m5 C& S0 Y; I' F9 { set intersections roads with
9 a" ~- s) A& j1 T5 {/ i$ z' Y! ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and4 H2 d1 \5 ]& q; U, t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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0 ]) r- M: w/ P1 t+ o5 l% r$ X# o ask roads [ set pcolor white ]$ Q6 f3 s( Z4 C9 q$ t
setup-intersections+ Y. G+ q0 Z; P0 q/ x$ q# N7 t
end2 u E. g9 p) Y
其中定义道路的句子,如下所示,是什么意思啊?8 n4 T7 H! v4 Q4 [5 i3 I: c3 n
set roads patches with
) u9 l6 }8 L( q! z7 z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! G) o" O) H! ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 v, I6 N. W! ~$ U( @; e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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