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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。
* z6 K) P) S! `; i: S' rnetlogo自带的social science--traffic grid这一例子当中,
* \" V7 B8 x% F* Kglobals
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. m) i, n/ s" e% L2 l0 c: r' I' c grid-x-inc ;; the amount of patches in between two roads in the x direction8 U Y% H n1 B3 R1 o
grid-y-inc ;; the amount of patches in between two roads in the y direction9 b) T* i# a8 {1 t/ w v% q0 o
acceleration ;; the constant that controls how much a car speeds up or slows down by if/ l/ A; q0 x1 o$ ^: C+ j$ C y( l$ K
;; it is to accelerate or decelerate- J' g0 [3 ], A8 F( c
phase ;; keeps track of the phase
# h" N& d, ?7 U; s; P1 i+ { num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" a/ M: G* T3 e; _8 L( { current-light ;; the currently selected light
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;; patch agentsets
I- ]6 d' o) K4 M6 w& x6 e intersections ;; agentset containing the patches that are intersections
- G# c% T' f& e. i/ L$ d roads ;; agentset containing the patches that are roads9 U' }: v3 R( n0 i1 ^
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$ P" e7 T/ a; X* k$ tturtles-own
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, k; H8 [+ U# S# B h speed ;; the speed of the turtle9 Y. f% M- I) [- Z2 ]
up-car? ;; true if the turtle moves downwards and false if it moves to the right
7 @5 B$ ^ P, I3 b wait-time ;; the amount of time since the last time a turtle has moved! ^* I. J4 Q& ?% f) n- `
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8 d3 `$ U: H) \. w) Xpatches-own: z8 d5 R3 s) D
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, e5 Z3 A5 o) \ intersection? ;; true if the patch is at the intersection of two roads
1 m) P' l4 O- K" ?) U green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 G1 e5 W4 V# L- J6 C5 |1 U ;; false for a non-intersection patches.6 C. | x C8 k/ B/ N: R F
my-row ;; the row of the intersection counting from the upper left corner of the5 r, y! u E- a% N
;; world. -1 for non-intersection patches.4 [, N; y; e5 I" v2 v8 f
my-column ;; the column of the intersection counting from the upper left corner of the7 N& C! N( W g i1 F: Z. N @4 m
;; world. -1 for non-intersection patches.- Z+ u1 V0 h, v& R6 o5 o
my-phase ;; the phase for the intersection. -1 for non-intersection patches.; J* m0 K. |( H6 U, R% b+ J" y D
auto? ;; whether or not this intersection will switch automatically.
0 \+ _6 H; k* K7 F% _$ |0 q ;; false for non-intersection patches.2 A8 }6 q u, F7 N0 g4 T) ]- r
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5 e/ V5 L: @2 y6 `1 T9 V;;;;;;;;;;;;;;;;;;;;;;. O, A8 p( x9 E4 U' e
;; Setup Procedures ;;
0 s. n5 X& `8 _" |* q;;;;;;;;;;;;;;;;;;;;;;
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: g6 M7 O: n; j0 h. E;; Initialize the display by giving the global and patch variables initial values.
% A4 {# K0 H0 N;; Create num-cars of turtles if there are enough road patches for one turtle to
7 m# j3 u" N# s Z& R) d;; be created per road patch. Set up the plots.
! f2 c. W3 d4 M% f3 j R2 Eto setup% j2 c) E" g I' M4 B3 ~0 c4 I y
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setup-globals7 B& H3 `8 |7 V! R, m* c
* j7 o! \6 ]' S% b% u4 \ ;; First we ask the patches to draw themselves and set up a few variables
' T; C2 \, ^3 H$ D5 G setup-patches* S+ y3 U% O+ V) I! G' H
make-current one-of intersections
# C# W ]% n$ c label-current
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5 @) V+ h# r [2 q' W# M# n set-default-shape turtles "car"
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8 j; Z) c1 A. o" P: k if (num-cars > count roads). Q+ D! P% \8 b3 n. l. @& I8 P
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) M7 T& w B# v. p# H# H; D user-message (word "There are too many cars for the amount of "9 q: H3 W4 h6 U2 Z" `! t1 i
"road. Either increase the amount of roads "
, B* \: ^( t7 @- g. A: r "by increasing the GRID-SIZE-X or "3 ]+ o2 t3 i" c9 x( U# C- b
"GRID-SIZE-Y sliders, or decrease the "9 ]) b$ T2 K, `5 c0 ~' I
"number of cars by lowering the NUMBER slider.\n"% ?! ?3 ~* }6 l8 w
"The setup has stopped.")) _) c/ A3 J8 f0 N4 ~2 Y. A0 q
stop/ i/ Z, ^) `' j* \8 [5 W, Q
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& C, U1 t$ r/ F1 k crt num-cars& s) n- A8 c0 q! ]* j3 ~
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setup-cars
( s! O" P5 K, Q- j/ E7 D2 h set-car-color0 ~) t5 W! R3 j: Y' \! G
record-data
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% ^6 y* S4 C1 R& ?: T; p& c# z4 w* } ;; give the turtles an initial speed
+ A- y2 s; P' x6 \ ask turtles [ set-car-speed ]0 n/ T/ L8 o& V- }
T) F+ M* z# \# v! n0 @- A reset-ticks+ D8 U6 c8 ^* N2 w' W) J( T
end* P5 r# z* L. f& U! C( c
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;; Initialize the global variables to appropriate values
( V9 x8 A. V& \; C( m, B; I$ ^2 ?to setup-globals
/ V, B+ W; i: ?+ z2 r set current-light nobody ;; just for now, since there are no lights yet
; }+ R$ w; ]4 k2 D: F" p; L1 R set phase 02 s3 X9 a+ d& [( k
set num-cars-stopped 0
( |- z! b- V2 F0 `- Z4 ^ set grid-x-inc world-width / grid-size-x
: j3 W/ o8 g/ ]! }$ g set grid-y-inc world-height / grid-size-y
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7 E! y! g( p% y* V0 C5 l6 W6 ? ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, J6 v$ f* a8 {# ?" w set acceleration 0.099
/ k; ^ L# P# S! pend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( d" |% H, }+ w& S" O;; and initialize the traffic lights to one setting
% D, z0 F- [+ [/ gto setup-patches
( {- F# ?* }& u. T. O ;; initialize the patch-owned variables and color the patches to a base-color
1 F" U4 E" r/ p0 a ask patches( N6 q4 F( x. p5 W
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set intersection? false
4 s% o+ x2 _; S& f$ A set auto? false
; k5 @# t- v0 m( u, Q set green-light-up? true! t9 o' @) ?, d7 Q/ Q s
set my-row -1; D& M% x9 A/ _! d
set my-column -1& m, a: H0 L" Y m* E/ b8 g
set my-phase -13 { ?" b/ b1 s! D1 a# p
set pcolor brown + 3
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) ~% r1 H$ \: v9 z ;; initialize the global variables that hold patch agentsets) a$ v g: z& a& _4 q* ^: J2 ~" o
set roads patches with9 u1 `! x; j1 p5 ^* O: H: w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' Q. ~3 M I6 `( P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ d1 r$ I7 [0 C set intersections roads with
+ O j9 b. Y Z: `$ n8 `1 m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ D. b' c( h. x) }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
1 }6 \& S4 E7 k1 p; D setup-intersections [' ^8 R; D9 G
end1 V/ Y, I- c0 S6 F) X6 w6 ~) _
其中定义道路的句子,如下所示,是什么意思啊?, @' R; M5 k8 r6 l( E4 _
set roads patches with
+ E2 R' F D2 k2 }# Y( k. D+ w4 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 Z' n! o4 F8 y& G+ H. D/ L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- L$ y) U( O- o* `
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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