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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。
9 z6 u2 A* y1 u4 ?' {1 e# n# qnetlogo自带的social science--traffic grid这一例子当中,
. E0 M- p! `4 `3 dglobals+ ] B) w0 I+ f& i
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 i8 S [+ p1 i* R3 Q+ h, F1 }
grid-y-inc ;; the amount of patches in between two roads in the y direction+ r: r D* e# B% j+ K( P: H
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 {0 ~% K9 u4 `. p+ r
;; it is to accelerate or decelerate, v t3 C1 b2 j+ \. T- _/ O) P
phase ;; keeps track of the phase
) {( {- r" z, }; L. P9 N J num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) m! @; q% `& n9 K2 e+ U: [
current-light ;; the currently selected light
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; x* X* z+ X# ~* h1 D ;; patch agentsets
# n2 u* X1 f s5 {8 o intersections ;; agentset containing the patches that are intersections
6 ]: K: ?7 { e, S9 c/ ~) m+ { roads ;; agentset containing the patches that are roads# f! H9 Q' @! j2 @9 ~7 h6 |( |
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turtles-own! I7 |7 _2 `8 ^5 E9 u
[
1 L# G# m( O; M* U# D+ M) Z' s speed ;; the speed of the turtle1 c3 g1 ~. V9 {5 _% `( m
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; V0 k8 @9 K6 f( E wait-time ;; the amount of time since the last time a turtle has moved0 A# B# i1 l# c
]
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patches-own2 x! O6 N5 O% o1 h9 G5 Y
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. w; n2 Z3 ?# D% ~1 | intersection? ;; true if the patch is at the intersection of two roads' S# b7 r+ Z; E8 Y0 O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( n. R ~3 b6 _ p ;; false for a non-intersection patches.8 P L. a4 |# ~0 ~/ r
my-row ;; the row of the intersection counting from the upper left corner of the
$ s: @3 V0 K& ^, o ;; world. -1 for non-intersection patches.0 z: H) e7 p( F% t4 c6 d1 \3 p
my-column ;; the column of the intersection counting from the upper left corner of the
0 I0 A4 h% H5 z. a! P ;; world. -1 for non-intersection patches.
4 ?& Y+ l! O8 L0 l$ Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ _1 Y* y$ |2 E' t# _
auto? ;; whether or not this intersection will switch automatically.1 e: g6 R6 W7 k" U
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;( S+ e" j0 c; I# V- `' s3 I& q
;; Setup Procedures ;;& _* w! b- p# s
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;; Initialize the display by giving the global and patch variables initial values.. ?) {: r& H; i$ W$ Q+ z. M
;; Create num-cars of turtles if there are enough road patches for one turtle to
; o; B2 O* a; d5 X. V;; be created per road patch. Set up the plots.
* A) F" }' V* S" q) L" a0 y7 Uto setup
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; @- A9 m9 I$ `: d# A setup-globals* F" X! l0 j2 _' s# e; K3 m; I
; d2 [ @2 O$ ~3 m. p# T1 i ;; First we ask the patches to draw themselves and set up a few variables9 f U s4 h" [
setup-patches6 P( F2 ?) W" e7 ?) V
make-current one-of intersections
7 v7 Y- y! b+ s2 X2 T9 O- z label-current$ ]# Y3 J6 ]8 n$ M5 j7 F" z1 W
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set-default-shape turtles "car"9 u8 e- O3 _& Z. v" i: x* X
# U, W/ @4 S w, x& o if (num-cars > count roads)
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! g$ E- V, I, A. N- H. m% ] user-message (word "There are too many cars for the amount of "( O9 e p' v" V
"road. Either increase the amount of roads "0 J1 |) s! B; P) b) p
"by increasing the GRID-SIZE-X or "
3 `3 v5 P2 C7 L- z4 U a/ r* [/ Y "GRID-SIZE-Y sliders, or decrease the "3 D- c; M+ H) y6 e2 p
"number of cars by lowering the NUMBER slider.\n"6 ~* }/ r3 S0 l
"The setup has stopped.")
5 H: I7 _6 {' `& q, s* y( c) G stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: J$ ]6 e( A: v4 c0 ?
crt num-cars
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setup-cars2 i F# [1 t0 E' V
set-car-color
' c: ^! @ l) |( U$ L record-data
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;; give the turtles an initial speed
( Q9 J7 j& c, b! q ask turtles [ set-car-speed ]
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reset-ticks
" C5 c5 @0 H+ T7 l- ?; d# L4 Xend
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+ F: W; i% e* X/ H;; Initialize the global variables to appropriate values
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# S! a8 @! f- U, @' o" E; y set current-light nobody ;; just for now, since there are no lights yet
+ s/ Z) |0 X5 ~8 ~; b' e& w! D set phase 0/ y8 S% Y( i9 x: t9 r$ n
set num-cars-stopped 0& m3 x0 g& U% a% R
set grid-x-inc world-width / grid-size-x
/ ^0 D; {! B7 X: y& n( q4 r% C3 [ ^ set grid-y-inc world-height / grid-size-y
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# p5 g/ I, u6 x" c: G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary \5 l+ H0 w$ E1 b R
set acceleration 0.0998 E( J; w+ r: i- M
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- y6 \5 g2 G$ h) G;; and initialize the traffic lights to one setting5 B$ j3 O6 m/ i9 b1 m0 Z
to setup-patches
- v8 I/ G; J8 D6 z6 G. {5 m ;; initialize the patch-owned variables and color the patches to a base-color
, r& v- u* c( c u- E3 L' _ ask patches
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( @0 E( b; Z! C% ?/ Z) Z& ` set intersection? false. }4 F7 i. I8 F% |
set auto? false
* v- e% _. Q0 K6 F1 A set green-light-up? true
# R' V1 [# k: E; Y3 J5 J w set my-row -14 m5 S) [9 j. O Y
set my-column -1
0 q* @; q& ~. X& d, X" Q0 f9 M, m set my-phase -10 i) V1 P5 A8 t% w8 @# N
set pcolor brown + 3
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9 Q" T. S; Y5 I8 k- p/ k1 S/ [ ;; initialize the global variables that hold patch agentsets
: |( ], _6 B) b set roads patches with$ b9 x9 B5 Z/ K; f4 `9 ^3 O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 }/ ]1 W( ~' G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* H5 D/ I3 |" q4 D' ^. B2 k/ M
set intersections roads with& J: r) C0 X/ j8 Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& |/ B$ [% e+ _# O" M0 C( u# T: I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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1 M( U2 B; j% [, _" ? ask roads [ set pcolor white ]
2 y! w9 D% Q `2 ~; o y% z setup-intersections8 L' K1 C2 d- d, s9 F5 u
end$ P+ s4 s, |% s- w% S" _4 t
其中定义道路的句子,如下所示,是什么意思啊?
5 j2 L- h0 m* T set roads patches with6 R( D$ c! ?* M% H% `8 r
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ C9 ~ E f& [4 u# V; V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 a9 \ [7 Y. e( p" x* _ Q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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