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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。
5 x2 o. T# O1 ^5 ~5 w$ @netlogo自带的social science--traffic grid这一例子当中,
. J( c( @4 l+ }8 M% `' g tglobals) a6 B. ], i- t$ g) r) x
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- A8 \" }8 k- x3 Q% P grid-x-inc ;; the amount of patches in between two roads in the x direction
$ R1 l9 y0 B7 f7 W- t grid-y-inc ;; the amount of patches in between two roads in the y direction1 E" D4 k6 G3 t% x
acceleration ;; the constant that controls how much a car speeds up or slows down by if$ r+ W& I0 |0 I4 t% Q; ]1 O0 j% [
;; it is to accelerate or decelerate0 C+ a7 x8 i D7 B* m) n$ p" Y1 p
phase ;; keeps track of the phase
% \9 P _# q% t) U num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 q4 ?* v3 T0 K6 C
current-light ;; the currently selected light
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9 T; ^3 f7 I. i" D ;; patch agentsets% k" O% ~' D8 J* k0 z
intersections ;; agentset containing the patches that are intersections/ v% I) L! Z( a: L8 {
roads ;; agentset containing the patches that are roads
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4 o! x+ E& Q2 y! L; e2 Nturtles-own
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J8 {3 ^6 N+ v4 b! |- K speed ;; the speed of the turtle
3 W6 |1 }% _0 ]: X! y up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ x. w. a1 k' p7 Q" M: w* r wait-time ;; the amount of time since the last time a turtle has moved- j I2 h3 a5 W
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patches-own$ B3 H8 R8 e8 Y4 E, Y8 H' A
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) z) x8 e" P W! y- p' J( K intersection? ;; true if the patch is at the intersection of two roads
# c' ]: i* a0 N* s& R2 s+ i green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! A- f: r- l$ n0 x% J9 N R" Q ;; false for a non-intersection patches.+ C2 T7 P% S+ q% ^! u
my-row ;; the row of the intersection counting from the upper left corner of the# h) O0 S; T3 x2 b2 ?
;; world. -1 for non-intersection patches.! {# i6 W$ v, z
my-column ;; the column of the intersection counting from the upper left corner of the
' a1 ^) O! m* S9 V! [ ;; world. -1 for non-intersection patches.
1 W' a! v' p, N v; y9 C8 j$ f my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 g" D! W* _, S2 H; F* r, R9 m; o auto? ;; whether or not this intersection will switch automatically.$ `! D! G/ h: m- d6 q
;; false for non-intersection patches.
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6 @3 R9 d' D2 T. N9 r;;;;;;;;;;;;;;;;;;;;;;' d0 c0 g+ B/ D
;; Setup Procedures ;;
: r( ?! M9 x3 O* r8 Q+ r4 T3 L3 v$ g;;;;;;;;;;;;;;;;;;;;;;4 G/ a- U2 N% C; A$ M p. N
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;; Initialize the display by giving the global and patch variables initial values.
6 v/ P( f/ `) I6 b, k% p;; Create num-cars of turtles if there are enough road patches for one turtle to
; L( B' S' O: ^; y0 V;; be created per road patch. Set up the plots.
; F# P$ t3 V1 vto setup( \, K! Q9 r+ d4 x" a
ca
4 d5 Y+ @ I/ E, c0 n# X setup-globals" G* S/ e% P6 Y$ i
0 q+ t" ^5 e& w( y2 h" Y ;; First we ask the patches to draw themselves and set up a few variables
; q1 G0 k# z3 W, R0 w* g+ k- p setup-patches5 Z- n* o; X. w2 \" f1 g
make-current one-of intersections& u5 l0 ?" r4 @* G" V1 j4 f. {6 B
label-current
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set-default-shape turtles "car": h6 ~- ~$ P, t4 X0 m0 l
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if (num-cars > count roads)1 o2 u5 R2 S7 W) P8 C \
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0 S! a' t. v/ p% r' _# V7 t user-message (word "There are too many cars for the amount of "
' q0 x4 _7 E1 D$ I "road. Either increase the amount of roads "
0 X# ?( { F8 F, K/ o, m "by increasing the GRID-SIZE-X or "
/ Q" z8 i Y2 l; F# E; p "GRID-SIZE-Y sliders, or decrease the "- L4 y; U1 `' d. y2 M' N6 } O
"number of cars by lowering the NUMBER slider.\n"
- L9 U' _& C) U "The setup has stopped.")
- g% `0 V% R. _2 S stop" { W" d M1 I
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, U6 q. Z9 o9 m" ?
crt num-cars' A0 g$ }# a( l0 i7 M1 r& t
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: w' n& X8 Z, I o% E setup-cars
. R4 {% [9 g6 A% F. h& o set-car-color! y7 W# g; Y# K/ [8 n, y) z) w( O
record-data
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8 o# H; S! V4 E: L5 h2 o ;; give the turtles an initial speed! C' i, C, \9 V" O5 e3 F
ask turtles [ set-car-speed ]+ t/ s8 A* `& D! m+ M# V
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reset-ticks
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4 @- L% w Q% m8 _# ]5 n;; Initialize the global variables to appropriate values
1 M+ I( M* d/ F, Yto setup-globals
: V; f7 X( ]5 I" ?( t set current-light nobody ;; just for now, since there are no lights yet! P! r! Y9 P: f3 d, O
set phase 0+ s# O8 D$ { N% b( t5 V
set num-cars-stopped 05 q* r1 } e# G: x. j
set grid-x-inc world-width / grid-size-x
! s3 Y. G+ b9 D; w set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- p% M% i( q* J! e6 P set acceleration 0.099. {7 n1 I9 f- u6 v* O# l- d
end
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4 s2 _7 M: Z; p* G& n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 K5 b# ?/ F5 F( w! L
;; and initialize the traffic lights to one setting
' H y+ c& m" b" N9 k, S' g( r. rto setup-patches
( V7 K% X# u8 y; Q ;; initialize the patch-owned variables and color the patches to a base-color% k. G. m7 W9 o( ^ V& x7 z$ ]. o
ask patches1 k2 s$ i. p! L$ n! |7 b
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{- R" u# u% z& V set intersection? false
1 l, n4 T0 z+ v( ^) i3 {! i, `" Y set auto? false1 X; D/ m; [% ^4 z0 w; ?4 p- `& h9 ]
set green-light-up? true! z4 G6 \) I3 p1 Z) Q2 [" n
set my-row -1
I4 ]1 Y6 @ E$ l set my-column -11 s @* n! V L" [0 q* B
set my-phase -1
* u @% p n W& h) q8 n set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
+ H& ]- P; y6 x5 ~. G set roads patches with1 u3 P# G9 T1 j$ Q; J! ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# y: l" R# O7 O4 o- L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: Z- e% `6 X7 k
set intersections roads with
. j1 ~6 D8 I. T$ d$ f9 v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' O: Y) u6 r/ i" z( l3 [# f1 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 h. {# \# H! I+ ~
3 ~1 r2 J, Y# l- n ask roads [ set pcolor white ]8 L u5 m4 P. x% k% e( v4 A
setup-intersections2 L. Z, r T- U2 r: B) j( ]# o* f. [- x
end
7 P; l/ {2 O9 x3 ?4 ]& V: T7 g4 l其中定义道路的句子,如下所示,是什么意思啊?
; ^' {. X, S: d5 o0 I1 {. V6 K9 { set roads patches with; m% M, E8 ?5 n% S, R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! W6 E2 D# k7 ]0 Z! n% A& C2 @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 { j4 M! A U* P8 g7 w9 v' ^$ v* }
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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