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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/ W1 _. o6 Dnetlogo自带的social science--traffic grid这一例子当中,
, z; C8 N+ [+ g& y2 bglobals
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2 q/ [0 Q K* I, C grid-x-inc ;; the amount of patches in between two roads in the x direction7 o/ h# e$ F! F9 m3 A! Y2 U4 B
grid-y-inc ;; the amount of patches in between two roads in the y direction; `; B1 \" b2 {- i1 M
acceleration ;; the constant that controls how much a car speeds up or slows down by if4 c7 K5 j' f5 M7 I- ]7 o
;; it is to accelerate or decelerate
1 |' C/ v8 S. G4 I phase ;; keeps track of the phase
4 g. p5 ]& q$ J: a+ n; I4 x0 y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( L1 [! w0 u2 ]; Z7 `$ n5 g
current-light ;; the currently selected light
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;; patch agentsets
7 x- h, n; b8 C; j6 d8 ^ intersections ;; agentset containing the patches that are intersections- j& T! F4 H( ?
roads ;; agentset containing the patches that are roads' e4 O# k5 i2 o: _" ~' B
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1 b3 q9 n: Y! X$ n4 o {: Cturtles-own
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speed ;; the speed of the turtle
) g/ _! m6 [$ k/ e1 P up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ W7 j- o" k T8 M wait-time ;; the amount of time since the last time a turtle has moved
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patches-own: m# Y- `2 i7 i7 ~
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/ Z, I# {# ^0 A) S/ l) v intersection? ;; true if the patch is at the intersection of two roads
2 x+ X+ o( d5 {- P8 n green-light-up? ;; true if the green light is above the intersection. otherwise, false.
8 x1 q9 Z- \8 @, x! a& q ;; false for a non-intersection patches.
( |: Z7 Q, _7 Z& E$ L! R my-row ;; the row of the intersection counting from the upper left corner of the
; w& o j6 X3 K/ ] e+ M ;; world. -1 for non-intersection patches.
& _, M; I1 d( Z' }( M: [- W/ N: { @ my-column ;; the column of the intersection counting from the upper left corner of the
$ w% [+ h7 J) W( [ ;; world. -1 for non-intersection patches.
; u1 ^- P3 G0 S0 Q my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 ]# ?: H4 J& ` auto? ;; whether or not this intersection will switch automatically.
4 K+ O0 `" k: u7 k' M ;; false for non-intersection patches., ]! D6 u% I) b& W* M
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5 r6 F, W1 A; i* a% e, ~$ h% f; d: `9 a;;;;;;;;;;;;;;;;;;;;;;
7 X" d/ a. t2 Q( a;; Setup Procedures ;;
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+ z6 F# i) Z6 [- o# ?6 k;; Initialize the display by giving the global and patch variables initial values.; C* a5 o" G. m3 y
;; Create num-cars of turtles if there are enough road patches for one turtle to# t* p0 Z6 F Q3 K( g
;; be created per road patch. Set up the plots.8 K x# W5 q+ g& ?! [ t
to setup
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$ W1 n) p8 O l5 }1 G0 N: X setup-globals
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;; First we ask the patches to draw themselves and set up a few variables& ?! @5 y7 e% s( T. K; N3 a
setup-patches
7 f+ [1 g/ D* o$ F make-current one-of intersections
; }3 r& g p, s1 D0 [ label-current
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set-default-shape turtles "car"
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if (num-cars > count roads). V, H8 T3 B- j/ `
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user-message (word "There are too many cars for the amount of "
$ O6 |" g5 z1 v+ D+ P k( Y "road. Either increase the amount of roads "! W+ O1 A' k4 {6 A% j( n( A- T
"by increasing the GRID-SIZE-X or "
" ]7 h" a$ E' e" C W' E "GRID-SIZE-Y sliders, or decrease the "# f- L# X4 k2 [6 I5 ~- Z+ ^4 p
"number of cars by lowering the NUMBER slider.\n"
* {# g* S$ _( j, E; I "The setup has stopped.")
2 b. p) D; A: t0 r8 m+ D stop
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K' M& _0 x& s- M5 B0 ?7 F ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; y; z7 t/ |# H
crt num-cars
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3 ]6 _, s9 L d% ` setup-cars+ U8 E3 M! P4 ~3 M+ ~5 G
set-car-color
/ w* L e2 f& [8 n. i5 H record-data
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# M7 M: R8 M9 h$ j- s ;; give the turtles an initial speed
9 I# ^/ o S* F; c' n7 j ask turtles [ set-car-speed ]6 P! ~7 q ?; U, N9 A( o2 ?! x8 _
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reset-ticks4 O: m; d W+ K. e
end
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;; Initialize the global variables to appropriate values& d& h) ]1 o0 L( ?- X0 B0 ~4 N
to setup-globals# o, p4 z+ B1 P) q# `
set current-light nobody ;; just for now, since there are no lights yet2 R" s. e v; z" \# g
set phase 0
! D, ~/ ]9 ?! I7 @ set num-cars-stopped 0. Q3 r& S" x( b! a$ R5 g( y" @
set grid-x-inc world-width / grid-size-x. V3 w6 Y" U% V2 }$ t5 |8 A5 U
set grid-y-inc world-height / grid-size-y( j/ v6 W. @7 r) T' q. B l
6 [7 V& q3 ^0 a) K8 |4 Y H, p ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# w# z( u" A# d: H' E$ \7 U1 P
set acceleration 0.099. E( e8 C. m. Q* C }# U' C
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; L: y9 k G$ o+ ~;; and initialize the traffic lights to one setting0 n. z8 b1 a, Q8 }( _
to setup-patches) U' H9 X3 b; H; g1 `% v6 }
;; initialize the patch-owned variables and color the patches to a base-color
6 r$ L* y& j" Y8 r; ] ask patches
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set intersection? false
* k& j( U( c+ Q. F set auto? false
9 L) Q- Y8 Y# ]2 ~# f0 d d, Q set green-light-up? true H6 ^' q" u# T, F5 r: j
set my-row -1
' v7 E/ l( Y* u. ^# V7 E set my-column -1' b) | |9 A* |6 ]8 S- q6 \- ]
set my-phase -1% \9 u" ^& _. x. s( v
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets z; `, ~2 \$ } [9 o! q9 t
set roads patches with
# F8 ? k' ^0 r5 B D ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ K' B) C& K/ I, a2 n1 J (floor((pycor + max-pycor) mod grid-y-inc) = 0)], J. P8 m8 ?& g0 y* O& t+ `
set intersections roads with
$ x: A& D& ?: w4 o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 }. O- S9 X% t$ }5 Q" `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end
" i% m3 D) @# t6 y2 L其中定义道路的句子,如下所示,是什么意思啊?
0 Q; i, O! P+ g4 G. I set roads patches with
) e4 l. W' S) ?/ o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ }% H( p F, Y8 i. h (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 [6 |- ]* b x9 [7 m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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