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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。
7 L- I# s/ |/ r5 _) I7 lnetlogo自带的social science--traffic grid这一例子当中,/ \3 X8 I+ y" g6 V! G
globals, x9 j5 N' I w4 W0 }, y6 C9 ^
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% x7 B$ c: f) A% {, J grid-x-inc ;; the amount of patches in between two roads in the x direction
2 Z( p/ ^# y* i6 E' E3 ^8 { grid-y-inc ;; the amount of patches in between two roads in the y direction8 s# W$ M7 K3 a0 a" g
acceleration ;; the constant that controls how much a car speeds up or slows down by if4 d1 ^: j* N3 x e `. J
;; it is to accelerate or decelerate
7 ^3 P# L5 `/ D( [: w/ [ phase ;; keeps track of the phase
/ s: S" w y' ^1 J( H* } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 c* P; S' I6 k4 S( |; }' T
current-light ;; the currently selected light- ?; s P/ A0 o8 g5 }% k3 K" N
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;; patch agentsets% b3 y/ \- }2 Q m- A! k' R. P
intersections ;; agentset containing the patches that are intersections
6 W2 I5 w! G) g+ X2 f. S roads ;; agentset containing the patches that are roads4 [' F$ [' Y8 t# F5 f& p( N" a
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turtles-own
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4 _" e2 I: E+ b" t: d8 ~ speed ;; the speed of the turtle( t. a5 w1 s# X. q4 Y; r
up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 ^1 l! a( j9 `. c wait-time ;; the amount of time since the last time a turtle has moved
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patches-own1 A# f- v5 W; W. C% D$ g
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intersection? ;; true if the patch is at the intersection of two roads
: @2 {; l7 c9 I green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 F7 u; e. h& d( Z4 _ ;; false for a non-intersection patches.
" {6 T+ z O* ]* B" C- H" Y$ g my-row ;; the row of the intersection counting from the upper left corner of the, e0 p/ C* _0 n: c& \1 W* I# d
;; world. -1 for non-intersection patches.( D4 ?& h5 ^; J5 p5 X6 f: Y
my-column ;; the column of the intersection counting from the upper left corner of the1 ?( m7 }& V& g0 f! A* q
;; world. -1 for non-intersection patches.
, p, @: }! v1 M/ F. _$ p my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 ~( G( v$ h+ }- k' D! { auto? ;; whether or not this intersection will switch automatically.6 b) Z1 I) s0 G. B) F; I! h
;; false for non-intersection patches.) z2 ^9 \" z, Z) G0 B9 R: N
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% a7 m! F2 M( o5 g7 \/ M" X;;;;;;;;;;;;;;;;;;;;;;6 T4 Z& z3 c6 Z( E7 z# c
;; Setup Procedures ;;
3 g3 I. }: w. ]: J6 };;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.) d* E1 h1 M( r1 \
;; Create num-cars of turtles if there are enough road patches for one turtle to- f, ]- _1 G$ D: W- A
;; be created per road patch. Set up the plots.
; r5 v0 H8 N9 Y D1 Dto setup$ B: \' i; X/ t
ca
4 O$ D1 S2 ?' @0 J setup-globals$ d5 a1 q3 G: ^) v
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;; First we ask the patches to draw themselves and set up a few variables
4 `- {; L% O' [/ l/ N* ? setup-patches
, B7 T* Z9 z- [/ D3 R- o make-current one-of intersections
! A/ n. q9 k! n, Z label-current3 {8 h: A% D/ F; ?4 r7 P$ `
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set-default-shape turtles "car"! D, N) s% {0 Q7 U; [' `
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if (num-cars > count roads)4 L! ?: J. C, Z& D* E9 \% d7 `, a' Q' D
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( }* G; ?( b! c5 T8 w2 @ user-message (word "There are too many cars for the amount of "
1 L( x* t) y2 |2 G a2 _ "road. Either increase the amount of roads "
; I: ^3 p1 ]9 _0 X "by increasing the GRID-SIZE-X or "
. l% v8 ?2 N5 _$ n, d "GRID-SIZE-Y sliders, or decrease the "
! e- E, `' Z2 k4 j& j) s "number of cars by lowering the NUMBER slider.\n"
/ c1 w" i& ^5 } "The setup has stopped.")3 ~$ t7 m6 y7 d. n# a
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 d$ J: Q- V. M: G' y8 z: d6 G6 b
crt num-cars2 S- Q) F3 A9 j8 P
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4 Y7 W! u Y0 R: S setup-cars; O7 a2 J: J! A7 T3 a, u/ }$ K
set-car-color+ e1 i) A9 N$ l& v$ t" u7 P
record-data
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;; give the turtles an initial speed
5 e1 @- {* \0 R% H8 W" g; a9 j; F; E ask turtles [ set-car-speed ]
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reset-ticks
- x5 w7 {2 w- j% a/ b: oend
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;; Initialize the global variables to appropriate values
' i& R1 w4 q) O6 t& \6 tto setup-globals
9 V: w, ~) o1 W* d set current-light nobody ;; just for now, since there are no lights yet
) M$ ]+ h7 N" Z$ `3 v set phase 0
8 o. W, c+ u+ V; V- G, } set num-cars-stopped 0
( c4 M' ]6 c# `* y- Q' B; P set grid-x-inc world-width / grid-size-x; r4 l/ L& y- q
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ x1 g/ x2 h1 B$ s3 p1 t
set acceleration 0.099. A5 j& K% g! p- G4 ?
end/ r. D' e) F) N
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' q' Z1 m) f! h+ `6 M6 K
;; and initialize the traffic lights to one setting+ s# p0 t' g. y
to setup-patches
( m: G) C1 b9 f7 w/ R( U, J! z ;; initialize the patch-owned variables and color the patches to a base-color& e/ C) b5 A# Q1 r4 Q- P8 l
ask patches
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set intersection? false9 F r& t1 }$ _7 A
set auto? false
& \7 h+ Q4 Z$ q9 w0 G! t set green-light-up? true
' F2 e2 S; g4 w set my-row -1
; ^2 H1 T3 k" H4 ?6 S7 | set my-column -1& S4 J$ W7 N3 B! w
set my-phase -1
4 A7 ^8 `' p G$ U6 a3 \/ z set pcolor brown + 3, C3 s F R; ~
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;; initialize the global variables that hold patch agentsets$ j, d& U( u+ e
set roads patches with
5 ?7 U& P c+ j9 @8 b: h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) e9 D$ G0 ~5 A( T8 x$ M4 j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ B( x5 R( x4 q+ k! Q set intersections roads with, o" ?$ F2 S$ @8 ~. e% X' S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 {% j, E7 z( Y, v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 \3 w7 M+ j% }# F* x: u2 X2 e
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ask roads [ set pcolor white ]
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end
" M4 _- I+ P2 c2 d% W; {! K其中定义道路的句子,如下所示,是什么意思啊?
% B* J' n F8 f+ D1 E% j+ ` set roads patches with* o2 p$ t) M$ y N1 U% @9 c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 L, H2 r+ i1 H8 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 n" f& @6 g# G% Y4 }3 Y0 v
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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