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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。 i9 i; r. A. a9 e9 z
netlogo自带的social science--traffic grid这一例子当中,
9 T) G0 W7 S I \+ O2 Fglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction \: D! Y# h- T# ?! C* a" D; @5 W
grid-y-inc ;; the amount of patches in between two roads in the y direction
' Q4 {' G; |9 E3 \( [ acceleration ;; the constant that controls how much a car speeds up or slows down by if1 Y+ C% V. z2 @7 k6 {
;; it is to accelerate or decelerate
4 l) B1 F- ?( L0 Q phase ;; keeps track of the phase+ P1 C' I3 v$ Q2 E- ~9 B
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ W1 C0 ~ V, |6 k3 |
current-light ;; the currently selected light8 k) ]% }! H: H2 H
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;; patch agentsets2 r" p- C4 U1 N( t9 y
intersections ;; agentset containing the patches that are intersections
# w2 [8 E. Q Y/ V0 [3 j6 J) R0 t$ g roads ;; agentset containing the patches that are roads
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turtles-own
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2 {8 @7 E7 h2 b; ~0 @3 x+ e speed ;; the speed of the turtle
7 M. j8 J, |; G* {* ` up-car? ;; true if the turtle moves downwards and false if it moves to the right7 O6 A1 {) V! {+ L* {7 m4 X6 P1 Y& D
wait-time ;; the amount of time since the last time a turtle has moved1 d5 R! _( M: f. n& k- ]" _
]
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patches-own
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. C, o% y! r+ N9 I n ] intersection? ;; true if the patch is at the intersection of two roads
; J% d# M2 d6 h5 F green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, a1 x! v# l' \ ;; false for a non-intersection patches.
, e0 b, H+ L: t4 @ my-row ;; the row of the intersection counting from the upper left corner of the
2 G* M- ^/ Q, [! D ;; world. -1 for non-intersection patches.; @ p: N$ r& O7 }- V P* L
my-column ;; the column of the intersection counting from the upper left corner of the
0 F' U( a$ H E% h# U3 v+ i ;; world. -1 for non-intersection patches.
4 h b$ ^: D, ^/ v* U my-phase ;; the phase for the intersection. -1 for non-intersection patches.; ~2 {6 S) s0 a+ W, E* r1 Y
auto? ;; whether or not this intersection will switch automatically.
6 k* F. D7 V4 O6 l8 ^: y9 @# M( M ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
* }. ?, c4 g$ N8 a4 X+ R;; Setup Procedures ;; t! }, l7 s# T2 K
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
: o/ e: S2 y' ]- p; Q;; Create num-cars of turtles if there are enough road patches for one turtle to ]; F3 z, Z. t: C; W. E
;; be created per road patch. Set up the plots.6 V$ z9 ?& A9 S6 b; z
to setup
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setup-globals
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@ @! x9 T/ @& A k$ F4 } ;; First we ask the patches to draw themselves and set up a few variables% e& k" |3 f; o. l+ N( c
setup-patches* v# j0 e) `0 L G/ N
make-current one-of intersections
% M) P- v" H/ l0 @: f6 m' ] label-current2 }& T3 D# I$ P; H1 _ ?
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set-default-shape turtles "car"
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' B1 C+ g3 p4 S1 R if (num-cars > count roads), L: g2 s. K2 N
[
- q& c4 ~3 [2 l5 d9 i) a* o user-message (word "There are too many cars for the amount of "* ]( b3 } J0 n1 p& m
"road. Either increase the amount of roads "
2 s/ B8 N3 n& ?1 z, j/ f "by increasing the GRID-SIZE-X or "' m. d) w, H; ?% h3 r4 y
"GRID-SIZE-Y sliders, or decrease the "
/ m/ D, \5 I- g2 h, f# u8 K3 l "number of cars by lowering the NUMBER slider.\n"
7 I" x' X% h2 B% j; D3 ?3 b "The setup has stopped.")
0 I+ M! o: V y6 w; O2 A6 L stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* I4 x- I7 @$ l! m crt num-cars
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setup-cars% _2 ~3 X. o& f4 P$ e! G
set-car-color$ w3 N8 ~' W) H( g. Z. x5 u& K- [& T! m
record-data
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' w7 e" E' K1 T ;; give the turtles an initial speed
) W% O$ U$ Z7 j2 F l ask turtles [ set-car-speed ]1 M4 @ V0 [3 b/ K* K, C
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reset-ticks
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( Y' F; S' _; ^* F! g;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
0 B* B- t+ ]8 z7 c' Y set phase 0
& \ B, P3 }- a set num-cars-stopped 0) o: X9 V- A2 L2 p% Z
set grid-x-inc world-width / grid-size-x
; y9 o* ]8 b0 q' O# h! B set grid-y-inc world-height / grid-size-y( k4 d% |- X+ Q
; n, [: i4 v( F4 g ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 p) C* U& p/ a8 D1 b
set acceleration 0.099. ?* h) V; X, v, p
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ o- c* a1 e# ?;; and initialize the traffic lights to one setting
9 G! O4 ], Z! j2 r$ }1 b \to setup-patches
, P8 x/ v2 T7 m& {6 H& c H4 w ;; initialize the patch-owned variables and color the patches to a base-color) p- A: u1 y% h' x7 b) j) W) k5 C
ask patches4 ~. M, \$ J0 x/ x
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! N& S3 ?0 Y9 I0 V' e" z7 B$ o set intersection? false
$ J* B. S$ p. f9 ?5 }8 b set auto? false' l- L* Z8 m( P- b( V! g; F W6 O
set green-light-up? true Z+ H" W: d+ X$ i
set my-row -11 B" W9 w# G, x7 |5 S
set my-column -1) f* u0 ]$ ]! }% a
set my-phase -1
6 e) ^( @+ I/ Z: U7 Y set pcolor brown + 3. t- ]% w7 y9 o3 D
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4 p$ ~! R6 ~) w* m/ d4 [! W% h ;; initialize the global variables that hold patch agentsets7 [7 K) a4 Q# l% W
set roads patches with+ l2 t( W6 B( l6 a% h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ v: T' j7 y9 Q8 U C5 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& `3 F9 R2 y* ?7 U# a6 X6 V set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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: H4 V4 l& V, e# \- Y" H其中定义道路的句子,如下所示,是什么意思啊?- g6 `" M) v/ f" {& y, Q" x+ s& u
set roads patches with2 H$ u8 m8 j: y- ~7 }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or D; K2 m8 m, K% w6 k3 \, t" K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* g; u1 a) ]. z' S
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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