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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。
! _: b: v7 R- qnetlogo自带的social science--traffic grid这一例子当中,+ j" N u# L6 V8 q' {: b
globals& d3 N5 s7 C6 C3 O& L
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grid-x-inc ;; the amount of patches in between two roads in the x direction' U" r! p; ?. F4 a
grid-y-inc ;; the amount of patches in between two roads in the y direction( ^4 {3 j9 d; Y" n8 p1 z
acceleration ;; the constant that controls how much a car speeds up or slows down by if& H; _, ?& f: i
;; it is to accelerate or decelerate
. Q# ^4 X+ }7 H phase ;; keeps track of the phase1 o5 `( J3 j8 R. N4 o* r1 Z9 c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" X# e$ ^. n8 ^! {
current-light ;; the currently selected light
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;; patch agentsets+ z2 e$ W' S, } I
intersections ;; agentset containing the patches that are intersections
4 C5 C n* W* p+ x o0 x+ y roads ;; agentset containing the patches that are roads
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0 k( F' S$ R' ^3 |turtles-own, c' j0 j' Z8 K. S/ j: b
[
5 ]+ e: {; X2 s7 c) H2 \% r$ }4 O. T speed ;; the speed of the turtle6 C5 B: f- F) t, p9 I
up-car? ;; true if the turtle moves downwards and false if it moves to the right* C! `( o" d" p4 |" o
wait-time ;; the amount of time since the last time a turtle has moved
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; ~/ [1 U- `8 W* \- m! V: Mpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
I* |3 a# n# C. N" t! [ d7 _ green-light-up? ;; true if the green light is above the intersection. otherwise, false.' ^6 e/ X, s, ^4 ]5 F g
;; false for a non-intersection patches.
# [# K( n2 ~2 D2 k my-row ;; the row of the intersection counting from the upper left corner of the1 S- J' |& Z* h6 O& n" c
;; world. -1 for non-intersection patches.1 |% l. A; y& j% S- k& ?
my-column ;; the column of the intersection counting from the upper left corner of the
% `; N8 I# X1 y- v0 c ;; world. -1 for non-intersection patches.4 d; r8 z8 P1 g, \7 T
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* x3 W/ K4 W& |' G6 R: ?, q9 r auto? ;; whether or not this intersection will switch automatically.
& L f; b- M7 f. \ ;; false for non-intersection patches.
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h: f' m5 M: q6 E;;;;;;;;;;;;;;;;;;;;;;3 D; ~ R" c' o/ ^' V0 Q
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
; e9 @5 i R/ f. G- M2 W;; Create num-cars of turtles if there are enough road patches for one turtle to; m. i* \' ?6 r6 P0 L2 ]
;; be created per road patch. Set up the plots.! E; m1 A- i6 e( c( c
to setup
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setup-globals
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; ?( e& X5 N% k ;; First we ask the patches to draw themselves and set up a few variables# d' R( ?; [2 Y1 ]: h5 B
setup-patches3 c, R& ~1 q; B1 Q
make-current one-of intersections9 y7 Z2 c6 n. W; `# O
label-current
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3 D W8 q" M- ?' {+ d% @. c, i5 S set-default-shape turtles "car"
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3 _. j& x7 A8 Q& K if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "2 @3 A( T( \' i! y5 A0 |
"road. Either increase the amount of roads "1 T7 ^' l) Y P6 H# [5 L
"by increasing the GRID-SIZE-X or "
. T8 E" V# y9 M; H "GRID-SIZE-Y sliders, or decrease the "
+ `! S0 _* P0 B2 j' [ z7 W "number of cars by lowering the NUMBER slider.\n", [7 }/ G& B* q
"The setup has stopped.")
- c! S& J# \+ F. B8 }) U; B stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* r4 G; p/ h* e* ^1 G crt num-cars
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# V! T3 c! g+ l+ f2 [" a& n setup-cars) H) J3 a" M0 b. u8 M$ F- ?" e! X
set-car-color
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;; give the turtles an initial speed
$ V, t2 J6 u5 B: P. k6 h ask turtles [ set-car-speed ]
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reset-ticks0 A+ [* O E9 }8 D6 Y0 D
end
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;; Initialize the global variables to appropriate values8 n, }1 E& V0 ?2 S# V
to setup-globals
1 b* H; q1 _* Z0 [! Z; n- _ set current-light nobody ;; just for now, since there are no lights yet, i# \" u4 w! v+ U+ C6 ~' b
set phase 04 \6 m9 ]# t. o# e6 @" j( F7 |
set num-cars-stopped 0# \0 ~" C+ i2 f
set grid-x-inc world-width / grid-size-x
. e$ C2 m) F7 S- x# w, e set grid-y-inc world-height / grid-size-y0 |- m8 U; c7 {
3 b2 E4 G2 g' d$ Q* c) p: }$ n: ] ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 @# [- @7 v& O$ @ set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 e/ w+ @) o/ S6 n5 [% W; \
;; and initialize the traffic lights to one setting
6 j/ F1 x% S! `2 p Bto setup-patches
8 l/ c, b3 i5 b* w# a% o* } ;; initialize the patch-owned variables and color the patches to a base-color
# k" s8 C' C) V9 q6 K ask patches
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& [/ Z3 q% R, [' k6 y set intersection? false
' ^9 X2 [( j+ t+ `' N/ H: L0 {1 T set auto? false6 T. O* N7 F4 ]+ v( z# t' A
set green-light-up? true1 _" |5 @6 d/ N% n. k" @* m
set my-row -15 X( ], J; c2 z2 z7 x* C0 ]
set my-column -1
4 q9 N& S( u% B3 g M! M set my-phase -1# E) j2 X+ \0 }- {3 b
set pcolor brown + 3# P3 L4 `8 _: ~9 c" _1 v
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% d2 y8 L: p, N6 w0 O ;; initialize the global variables that hold patch agentsets( }1 ?" j1 e3 D( q7 N5 k
set roads patches with
* x# r9 B7 b+ e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 L/ y& u, W+ l$ P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Q; z! |9 I# s$ v" @- X3 C
set intersections roads with. `" \. V( E' E% [; G& v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' v/ f/ d X4 R+ m* ~ p; p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; C: q0 k6 x' r; \
! X5 l- T& f8 l ask roads [ set pcolor white ]
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0 T+ _- @+ K0 v' T$ g8 oend
, S; U$ \& k, O2 r其中定义道路的句子,如下所示,是什么意思啊?, Y/ h' U: n( b' x1 X7 N& I2 c1 }8 X6 V
set roads patches with
5 i. Q& \0 j4 T0 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, U9 v/ m) Y& q$ O; K1 s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& z5 g; y# S* Y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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