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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。
, L2 W7 F% A0 Y1 o$ w* fnetlogo自带的social science--traffic grid这一例子当中,4 ?# H7 X% D6 X- A c" t+ z& O7 c
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction0 J; }. ]4 @+ N9 G* }% k
grid-y-inc ;; the amount of patches in between two roads in the y direction; e8 ]! D j- d- J; `+ l3 r1 P/ ]
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 F9 K) ^/ Y& a' z
;; it is to accelerate or decelerate
* H( {. I/ K9 Z phase ;; keeps track of the phase8 W! k4 a' l2 b" c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) t# R' R, l$ ^6 j. U
current-light ;; the currently selected light
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;; patch agentsets; J H7 H! x5 C! G
intersections ;; agentset containing the patches that are intersections5 ]: ^: {$ r8 \. e; q L/ u
roads ;; agentset containing the patches that are roads
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6 w% A* k- {# J1 G0 V. _turtles-own
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speed ;; the speed of the turtle! g0 K, t+ m: G3 J
up-car? ;; true if the turtle moves downwards and false if it moves to the right; n( I6 r9 g" ]) P3 \* n1 \
wait-time ;; the amount of time since the last time a turtle has moved- z1 i* F5 z* Z5 t, r- Y
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patches-own: j# t! Y' R. ]9 k# R- ]
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intersection? ;; true if the patch is at the intersection of two roads' V8 V5 c+ v% ?' D3 c: u$ t e3 i
green-light-up? ;; true if the green light is above the intersection. otherwise, false.' c" P3 T5 W9 u: P
;; false for a non-intersection patches.% U5 C1 C! ^$ }7 N$ B% y3 T" J
my-row ;; the row of the intersection counting from the upper left corner of the
5 ]! W% X$ c! i8 m1 ]) } ;; world. -1 for non-intersection patches.
1 i I/ c F' {+ O, h8 ] my-column ;; the column of the intersection counting from the upper left corner of the6 u6 c/ E1 D) m, Q) @( q. x7 a
;; world. -1 for non-intersection patches.0 Y1 N: S- _3 |5 `5 D. d K0 g
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 O6 z: j; N: P- T5 k1 H1 e" f7 G* p auto? ;; whether or not this intersection will switch automatically.8 O# i& b7 ?' t4 X5 z; D
;; false for non-intersection patches.9 E& U2 s) u& h _3 S9 Y
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;;;;;;;;;;;;;;;;;;;;;;
3 a* \+ t8 k Y1 K5 Y( g" f;; Setup Procedures ;;
- D" I3 M+ a( i# a1 s;;;;;;;;;;;;;;;;;;;;;;" q4 a- g5 {4 ]9 V ]8 p3 r) `
! D( k9 b1 ^( M3 B;; Initialize the display by giving the global and patch variables initial values.
. L; U% A( u7 C( N! J;; Create num-cars of turtles if there are enough road patches for one turtle to
% L/ \ ~& }& |% h+ a' Z3 d" M* ];; be created per road patch. Set up the plots.+ h5 ]" ?4 v7 @9 T
to setup
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# y" a5 }. ]5 N* s2 e+ R1 a setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
$ `' a7 @' @! i+ u setup-patches
% Z0 Z$ \. p+ D) S, k% ]$ y9 ~/ c make-current one-of intersections+ ^8 i7 z. W7 B
label-current
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set-default-shape turtles "car"
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4 k0 T4 E/ o/ c" N' m* I# m if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
' e9 Y- b( {4 y, Q5 ?& X "road. Either increase the amount of roads "4 K" L I; P% y0 |0 ^+ E' _2 d1 S
"by increasing the GRID-SIZE-X or "
: j/ ^7 N0 o2 R$ l+ C "GRID-SIZE-Y sliders, or decrease the "; r$ T' r- d' P( q
"number of cars by lowering the NUMBER slider.\n"
( j: w- j; Q. I) ], y* P* { "The setup has stopped.")
* Z) s1 g' Y5 l6 A& n9 R: a stop9 m" Y2 Z2 q! x) j- x( X
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* v3 B% g# m0 F% a/ t% c crt num-cars$ R1 h% }( v) s, d; o
[
% |; D. V3 R6 l. ? ] setup-cars
6 ~3 ^$ L* J8 L6 S/ R P set-car-color
8 \1 T z, Q9 y; D/ r& A5 L record-data
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4 O& _. e% `4 Q7 Z ;; give the turtles an initial speed: l% F# ?/ \" |4 I
ask turtles [ set-car-speed ]6 S0 g5 U) {8 s, D! J/ W. a5 |
9 z' X* R3 t5 ~3 v reset-ticks; v3 f' D$ Q0 V
end! e! d8 m. f8 g \' ]
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;; Initialize the global variables to appropriate values
( c8 b' J D7 v0 Q- ^7 _to setup-globals; E2 d! b# a0 {' f8 w2 n
set current-light nobody ;; just for now, since there are no lights yet
5 t v$ S& ?7 [8 B4 k set phase 0- p, h3 ?0 G- N2 Z+ l8 ]
set num-cars-stopped 0& g3 E% W/ Q3 U
set grid-x-inc world-width / grid-size-x
) W9 R8 F2 r( Q' M& M/ _' L2 B1 @6 C set grid-y-inc world-height / grid-size-y
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' r" X, P8 a4 _& W k2 b+ I) z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 d+ A8 N9 S! y! ?( X
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( E* Z% H t; Z9 s8 f _5 ?( W
;; and initialize the traffic lights to one setting
5 H3 f4 a, t: Y% r, A0 f; K5 tto setup-patches; Y; X) r7 w% d! m6 b6 n- z
;; initialize the patch-owned variables and color the patches to a base-color
0 u/ `5 I. z4 W8 W0 i* T ask patches
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set intersection? false
z. i% _0 i* {6 I" Z set auto? false( ]6 D( ?& _( D& K7 `( M2 R5 |3 h
set green-light-up? true
: e. A' S/ H4 C( n, }4 K9 k* a set my-row -1
& v5 s* i4 W. U5 \& \/ B5 M set my-column -1- V! X5 X! R* ~6 }+ V6 X, E
set my-phase -12 v5 `7 Z4 H0 A! p" R. Q( k
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets* m) \" k8 ~' X# E: \: N
set roads patches with
. `, ~- u8 {' y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or5 g& n2 U( p5 F( g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" l2 \' q& r6 R- c9 Z. B
set intersections roads with" M" p9 I' G/ G0 c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; T$ `7 T" @$ O+ ?! ? Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! ]% o) L+ T+ P4 @' G2 D2 Y; O0 ~9 M ask roads [ set pcolor white ]
* j* f* w! q* F' }" o! L6 | setup-intersections, S- ~0 L9 k$ ^- ^* B5 R
end
$ u) o( z/ z8 @" q z: r7 p0 S( c其中定义道路的句子,如下所示,是什么意思啊?
& \( _; Z0 D* k; s% ^! h0 ], u set roads patches with
4 L4 e. A1 `6 t. l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 Q! I; g1 Q+ V( o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 M! k* H& h5 {9 m) U5 b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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