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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。
- V7 U( B. }; f- X) x& Cnetlogo自带的social science--traffic grid这一例子当中,$ o2 R* r6 W7 }+ U; u6 A
globals. x3 b# i L* X3 w
[
. A2 A7 e, v8 H. e# r8 P grid-x-inc ;; the amount of patches in between two roads in the x direction: U. G8 e, {8 ]1 L0 G
grid-y-inc ;; the amount of patches in between two roads in the y direction. Y. j2 S' t+ z( M |% b) }
acceleration ;; the constant that controls how much a car speeds up or slows down by if/ X$ w: j. ]! E E' u( c/ O0 s
;; it is to accelerate or decelerate3 b, f' z9 h8 x" o7 S h5 m1 u
phase ;; keeps track of the phase
5 S' X- K+ d3 z7 f+ \ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 a; g, I' W9 e/ u* M+ J
current-light ;; the currently selected light( q6 y# B- N2 `$ M- }' X, Y, o
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;; patch agentsets! u9 f* H" H9 ~- M. Q& @$ J* U
intersections ;; agentset containing the patches that are intersections( c/ a. @+ D; C1 h6 p) M
roads ;; agentset containing the patches that are roads5 I0 @9 t/ j [- L$ u
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turtles-own2 `3 Y" {4 X/ `" y! }
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6 L8 h) h( q" U6 M4 V speed ;; the speed of the turtle
6 T) v% u) k& S4 s" ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right1 D9 K' b, H ?' O) e' B5 q
wait-time ;; the amount of time since the last time a turtle has moved
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, A. e5 y+ T$ v) T! l" Ypatches-own
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7 y, f) c2 F9 E intersection? ;; true if the patch is at the intersection of two roads
3 a8 O" j( ?( m; D! w. _# ? green-light-up? ;; true if the green light is above the intersection. otherwise, false.
7 D. O, E- B* Z0 N# |9 C* d ;; false for a non-intersection patches.! N9 c1 o. c) f
my-row ;; the row of the intersection counting from the upper left corner of the+ p- F- B7 D# J# n
;; world. -1 for non-intersection patches.2 u' s; C# [' [- A. t* i
my-column ;; the column of the intersection counting from the upper left corner of the- C7 s0 l3 s c
;; world. -1 for non-intersection patches.
8 B3 n2 M4 V& o! T+ c my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) }) u Y- B3 T+ \% S0 o auto? ;; whether or not this intersection will switch automatically.
& y6 K, ^# v0 @2 {6 }/ A6 H ;; false for non-intersection patches.
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p/ X) W) n; u0 o;;;;;;;;;;;;;;;;;;;;;;# h$ O9 ~6 [" J7 ~
;; Setup Procedures ;;
$ A b: _1 g" i/ l4 P;;;;;;;;;;;;;;;;;;;;;;7 \$ h2 g: o+ L8 _: V9 W+ r
8 K9 x+ M' ^2 l/ c7 c. Z" E0 n;; Initialize the display by giving the global and patch variables initial values.
% `: i c5 r+ \: U/ l8 L3 \ c;; Create num-cars of turtles if there are enough road patches for one turtle to/ q5 Y5 H5 n8 v1 n/ U) J
;; be created per road patch. Set up the plots.
9 h7 h9 d: M0 [3 p0 o/ D' q: F, }to setup. |( }# R9 e4 W, p$ E
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setup-globals0 Y4 G: n( l4 U V+ L$ h r
+ \( p: Y |7 X- l9 m ;; First we ask the patches to draw themselves and set up a few variables
) q/ ]+ Z5 n- ?- K: I% X6 A, e; C setup-patches* W. n+ t+ w7 _
make-current one-of intersections
+ {- [2 `2 X" L" T( k label-current
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, ?; ~2 ? J# Z p$ m set-default-shape turtles "car"- l0 k7 Q6 y8 w( S7 @6 M
& d9 R1 e' |4 S- K if (num-cars > count roads)9 y. t& u7 L& |! N0 ~* |* O$ P
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7 f2 y/ E+ {6 Z! t6 P- T9 P* v; Z user-message (word "There are too many cars for the amount of "
" |! U% e9 G6 }, Y) o. l "road. Either increase the amount of roads "
" g. X! I' N U5 R- s "by increasing the GRID-SIZE-X or ". E* j1 h# ]$ j: \$ {5 D
"GRID-SIZE-Y sliders, or decrease the "8 |* }/ a9 S) [9 I. Z; v3 Y: s
"number of cars by lowering the NUMBER slider.\n"6 v/ J$ E9 z4 p
"The setup has stopped.")
- {& ? F3 d& G# l9 f stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# n4 u9 I C- d crt num-cars
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; R$ h, t3 Q+ g5 x; O/ i( }- o5 ? setup-cars9 X" E, @% x. G- s( k7 }7 j
set-car-color8 r* g# K% T, y1 X* {* s
record-data
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8 ^" {0 b4 J* A9 U3 L6 ]3 c ;; give the turtles an initial speed/ t7 X- ] M8 d4 b( G
ask turtles [ set-car-speed ]
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reset-ticks
, A( U. M$ l6 q ~7 g' R. jend
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* W H4 h) h" p5 O) c;; Initialize the global variables to appropriate values
5 U7 Y8 }/ R; E7 e0 ^: f5 P# S/ Mto setup-globals
8 |6 l+ e4 C+ g5 t set current-light nobody ;; just for now, since there are no lights yet% L) s8 s, ]* u ]8 c( O
set phase 0
1 V9 s* E5 k* [9 J% _ set num-cars-stopped 0
' g/ @- H; E3 L' d- G' A/ R set grid-x-inc world-width / grid-size-x
! J6 p# n+ c6 Y P set grid-y-inc world-height / grid-size-y
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# ~9 w* _2 w$ c ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- e! A% r$ G% f9 v* k set acceleration 0.099' C* o" M1 x: u/ X! i
end
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2 ^) X0 w$ r2 v6 A+ a+ T4 Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets, J3 O( @: P. {3 e# r/ J
;; and initialize the traffic lights to one setting: ~7 Y( [/ r8 Q3 I1 E
to setup-patches
Y* d0 K- Y0 d9 X f: _- M ;; initialize the patch-owned variables and color the patches to a base-color
! m! \& j; ? ^! }4 ]! r* h ask patches
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set intersection? false) J( {; ?& [* h4 c: Z. w
set auto? false
1 h5 I' }/ _. m% q* T set green-light-up? true
) e( W0 D0 V6 v. C9 S set my-row -1$ V: V* ^- c! F/ u& K& L
set my-column -1
' |) @) x% s Y/ |7 K$ \ set my-phase -16 V$ O& I* A5 z, ^5 e& r
set pcolor brown + 3. C0 B, B1 l" q2 x
]
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;; initialize the global variables that hold patch agentsets. s9 Q% c- E: X3 T {4 f% p
set roads patches with
0 Z# h) R3 z7 W+ X% i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 [6 O' [! C. |3 }- r/ x' z- s* C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* Y9 J( Y1 \' b& O& } set intersections roads with* D5 I9 H9 W! b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ I: u! A0 Q% @6 A6 j1 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 q5 k0 a: |! z; a! E% t D8 |
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ask roads [ set pcolor white ]
) q6 ]9 v* ^- V7 c W* z- i4 X# J setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?- b* C# E- }, `2 J% H* b
set roads patches with O8 {, i) ~0 W, f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or q$ F# K! T$ e& C. d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! K& G% `( |) f0 ~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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