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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。2 x4 M f7 V' p2 x" j9 W
netlogo自带的social science--traffic grid这一例子当中,7 C! h |% \ m4 }
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 @/ K6 a: I" w. ^- n- z grid-y-inc ;; the amount of patches in between two roads in the y direction
9 U. a% q9 T: W. n. ?* c acceleration ;; the constant that controls how much a car speeds up or slows down by if
& F+ R- S6 l! j8 | ;; it is to accelerate or decelerate: H: H1 Z) {$ K! n. v2 [" z
phase ;; keeps track of the phase$ E4 t3 L7 t8 v. J. i2 ?2 b
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure/ E2 f/ l, `; x, C- F
current-light ;; the currently selected light5 x2 M3 ]5 ~/ c/ i! m* m( z
7 i- I0 `' D3 ? K5 U) i ;; patch agentsets
& }1 n2 c" G+ p; p% Y% ~) s intersections ;; agentset containing the patches that are intersections
- @- [$ z' a% \' ` roads ;; agentset containing the patches that are roads4 K5 }3 P: x% B& C7 h9 J
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turtles-own
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speed ;; the speed of the turtle! y0 _8 m$ a( c$ _
up-car? ;; true if the turtle moves downwards and false if it moves to the right, S' w( W1 G: c1 K- Z
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own8 Z# D) f+ U3 q; u9 a6 m* U
[
7 X9 S, d# l( h, T2 [+ i: H6 G intersection? ;; true if the patch is at the intersection of two roads9 ?2 b1 W: p7 O5 ~! j
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ H0 ]- U" f: J' L; _$ _7 s* X. H
;; false for a non-intersection patches.2 x; q3 I+ ?- H5 U% }0 f7 q
my-row ;; the row of the intersection counting from the upper left corner of the- M- b# |0 Z" E
;; world. -1 for non-intersection patches.4 h6 W2 o0 S$ N; u; F( _
my-column ;; the column of the intersection counting from the upper left corner of the
( L+ w- d$ g9 p$ i( q5 N& l ;; world. -1 for non-intersection patches.3 m3 Q1 B, u0 d/ P* C- J
my-phase ;; the phase for the intersection. -1 for non-intersection patches./ U1 m0 A8 J) h
auto? ;; whether or not this intersection will switch automatically.0 s3 s2 H$ S! y8 f
;; false for non-intersection patches.! V1 z2 E* z& ?4 ?( A8 Z! \
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|( |: f: Y6 z8 T% |;;;;;;;;;;;;;;;;;;;;;;
& l/ x, E: {: r- b;; Setup Procedures ;;
" h. \1 e. c+ ?;;;;;;;;;;;;;;;;;;;;;;
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) U) y/ Y2 \, K$ U$ e6 _! ~;; Initialize the display by giving the global and patch variables initial values.
! C& C' P( m: O. s+ ]. };; Create num-cars of turtles if there are enough road patches for one turtle to* g+ Y" M$ T0 c* v% C7 b. j; N
;; be created per road patch. Set up the plots.
1 F0 M4 y) O Y5 i4 vto setup" a- s8 e; t8 ?7 K- j! S! l
ca
! \* W4 i4 A3 q% l7 k: Y; A setup-globals, x6 L: _7 y- ^
0 K4 R7 ~2 E0 `% G2 | K, k0 B ;; First we ask the patches to draw themselves and set up a few variables8 X+ l' P: |# s/ e. F
setup-patches
) J' }6 G/ L' I0 a8 k) T make-current one-of intersections
7 p5 Q; ]& ?7 |, c label-current& Y4 \; \5 O, ^6 v' R
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set-default-shape turtles "car"
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if (num-cars > count roads)
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! x0 t* ?! e* ?# | M8 P. O user-message (word "There are too many cars for the amount of "
6 n) X) k6 B+ d6 X0 _ "road. Either increase the amount of roads "( ~) R7 @9 {8 J! W3 Q- S1 `
"by increasing the GRID-SIZE-X or "/ Y5 V: O! G' {: g% |
"GRID-SIZE-Y sliders, or decrease the "& M2 Q3 z$ a' J% `
"number of cars by lowering the NUMBER slider.\n"4 e0 i% F; B& i* p. z; d
"The setup has stopped.")
6 k% j$ c0 `, y0 T1 v9 C stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color. V/ w2 P" Y0 ^! B! }
crt num-cars$ ~1 N/ ^9 @2 {# b) @
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; v+ d# v- ^* W' K set-car-color: \* p- U2 T$ `/ D) _
record-data. U* N# g0 x7 A6 Y4 u7 T
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;; give the turtles an initial speed' d/ e: `: \& [$ l) w" s
ask turtles [ set-car-speed ]
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/ I' V8 i$ U! U5 v reset-ticks
1 R- s9 Z8 p9 k9 S% T Iend
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
, G# I( ^' O9 i4 [2 e5 S set phase 0
" l% @# s$ c# K# u+ c set num-cars-stopped 05 m- _ c* u2 s3 D
set grid-x-inc world-width / grid-size-x
4 @! S6 c/ k9 F5 i set grid-y-inc world-height / grid-size-y" o/ }$ y: W- w" `
, [3 A- }$ ?1 S! f3 R8 J3 R: G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 s0 }( t- s8 d2 D* P% b
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ ]! ~' W, [0 F8 f
;; and initialize the traffic lights to one setting1 ~. u1 G3 F U1 P
to setup-patches
w1 K$ W3 _; ] ^+ m" A- o1 m ;; initialize the patch-owned variables and color the patches to a base-color
8 w- q6 X/ Y! W! E. P ask patches! z, |. u2 U$ I+ ^
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set intersection? false" v/ [; ^& I/ ]; g' x+ j8 H4 Z
set auto? false- E, T4 A* k* D
set green-light-up? true
! @5 Y1 w1 ?9 I6 M set my-row -1
- A' ], F6 g; {1 |# b' { set my-column -1
% q! f- C9 n& Z t, |3 i set my-phase -1: f/ y! j2 J1 n8 I
set pcolor brown + 3/ m3 ^1 r% N& C' L- k5 ^4 g
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;; initialize the global variables that hold patch agentsets
' I+ c4 @7 W6 v8 {/ Y set roads patches with B* G+ m+ F2 e2 o* @* U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' G: ]" K3 T U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ \0 }" f/ Y- ~8 x1 [$ M set intersections roads with
; B9 u' L1 R& z, ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# T9 p$ y8 h2 [. y$ x4 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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5 r1 T% r1 Y) q! O2 A- R8 T2 E ask roads [ set pcolor white ]. z( a$ m& }; q# `3 B' [* @+ {: P
setup-intersections
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( w; Y) |2 _# l% L其中定义道路的句子,如下所示,是什么意思啊?' }' Y* D* D. F! S
set roads patches with2 E: }; B5 j* ?. {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" f* Z2 f2 G0 Q4 }2 d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) U# {$ }2 m) l, u C$ N4 P
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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