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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。
- [, D7 [( ~8 {- R; wnetlogo自带的social science--traffic grid这一例子当中,
7 R* S0 ~7 n! g! y8 Zglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction- `) u& u$ g w6 i9 g, ?
grid-y-inc ;; the amount of patches in between two roads in the y direction! t9 k w5 ^- J3 h+ Q* c1 N+ a
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 |7 n, T% I- ~3 i5 b0 a
;; it is to accelerate or decelerate- H Q. d3 e: w
phase ;; keeps track of the phase; ?/ n! N, [8 o l
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 L. m/ l5 l J7 r g
current-light ;; the currently selected light
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# n- ^2 M9 L/ h; {+ q9 |. m' n ;; patch agentsets- h" F9 ]5 d. a, D
intersections ;; agentset containing the patches that are intersections* V5 J4 U3 R* f: ^5 J m
roads ;; agentset containing the patches that are roads
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s. Z: o3 a# S, V: Q. w8 Tturtles-own( p% r9 F; q7 b7 n+ h3 ^0 M
[
$ P* Q' B1 r2 S) \& ? speed ;; the speed of the turtle
6 A6 F4 v! u/ _ u. [- ` up-car? ;; true if the turtle moves downwards and false if it moves to the right# L* P* N' l& H8 ~
wait-time ;; the amount of time since the last time a turtle has moved( K* }" s, G# A' Z
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads$ p, I/ [% ]$ ]$ `8 D: s
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ n( J% S2 u+ Z9 F3 r- g, K ;; false for a non-intersection patches.
9 v& M5 \# R4 x- S6 H my-row ;; the row of the intersection counting from the upper left corner of the
5 k4 V! A, Z7 x) Q8 }2 m1 Y6 _! u6 @ ;; world. -1 for non-intersection patches.0 c$ [! R; @/ _1 V3 S1 y
my-column ;; the column of the intersection counting from the upper left corner of the
4 D& b; i7 H8 r. h2 \ ;; world. -1 for non-intersection patches.4 F9 n( z0 o' o c6 l& J K' h% \
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, C- ` }* {4 `' l# ]5 T" x auto? ;; whether or not this intersection will switch automatically.1 M0 t2 u- x+ r
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;- y; r5 Z, Q+ o# H- B" {
;; Setup Procedures ;;
4 P! M" h: i9 b. ~# o0 b& ~5 k;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values. b$ {: n" `; z% b
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ s" w. w2 ~3 ~+ X/ W;; be created per road patch. Set up the plots.
1 S( v0 w% @0 X2 h, vto setup
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) b& }& |4 N3 T6 F1 Y# o setup-globals H( T* o# f3 h# i8 R* z
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;; First we ask the patches to draw themselves and set up a few variables
. n6 H2 q; J$ s: `# X setup-patches
* t& c% T* b7 q6 c+ G8 q make-current one-of intersections
, ^% ^# `2 j$ y label-current
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" o: m& O# J: U. j set-default-shape turtles "car"& P% @9 a! n) }' k
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
2 ] x6 _1 ~. T: | "road. Either increase the amount of roads "' c6 w& C# Q9 B) Q# |5 ~) y
"by increasing the GRID-SIZE-X or ": X1 M1 |8 m; |7 y
"GRID-SIZE-Y sliders, or decrease the "
. T; ?$ v4 H/ e0 W1 Z, `5 v, v7 \ "number of cars by lowering the NUMBER slider.\n"
$ P* u: |8 v; u- K; [* Z2 z "The setup has stopped.")
. C+ O2 l$ z6 Y0 u ~) X+ b6 @ stop
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! q. D8 A' n* B: ~4 v2 u/ n/ f ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) Z( R5 H+ z1 x- b2 Q) R' r S$ t crt num-cars
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setup-cars
, X Q* I3 n) ~* r set-car-color
# X/ c) R& F( @4 O! a% K record-data: ^! k, a+ I( v; Y- `
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;; give the turtles an initial speed# e4 R- i4 y% [$ T4 ?
ask turtles [ set-car-speed ]
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reset-ticks
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p0 T$ m( S+ J8 a;; Initialize the global variables to appropriate values
& p5 ]; g9 _: i6 ~4 I( jto setup-globals
3 {% Q0 M& k& ^7 M- Q/ Z set current-light nobody ;; just for now, since there are no lights yet4 |# h: c, }7 f5 C5 |
set phase 0
$ k8 ^) H9 O1 w" [; } set num-cars-stopped 0
' c" i$ K! ^% G* m2 }/ F% n set grid-x-inc world-width / grid-size-x/ \0 w/ V% Q- ?# _' K! L- b
set grid-y-inc world-height / grid-size-y
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" k9 K8 A* d- i8 N: d ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ q' T2 } X# c+ D" M/ T set acceleration 0.099
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5 B+ @& F+ K# o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ S- C2 O2 X/ ^7 t$ \9 W;; and initialize the traffic lights to one setting
4 W' _4 P# G1 d8 }7 K3 M& W: oto setup-patches8 ^8 F' a" C% u5 {
;; initialize the patch-owned variables and color the patches to a base-color. F/ d7 \( X' D) S! G3 C
ask patches# G5 N& ?7 u# D1 {
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4 N- A4 i; Y0 G' _ set intersection? false
) ?4 w' B) B0 T/ h set auto? false! [; x) ]/ I6 Y
set green-light-up? true
$ `$ R: {" T& ]8 y set my-row -1
- t/ P) O* f' g set my-column -15 Q3 P) b- b; x& N8 I7 T! a; a7 g
set my-phase -1$ a" \+ C0 X, O7 x' g
set pcolor brown + 3
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2 [9 `) r$ O1 w0 W: V/ j ;; initialize the global variables that hold patch agentsets3 q$ R; Q! e. t' ~: p: Y% q
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ n4 [7 U" f. m0 u7 Y1 Q set intersections roads with( S+ b; e# f) e4 Y$ J0 X' C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. f% E5 R0 V2 z2 l& L+ R4 J6 ?% g5 b8 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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2 n4 B- p' w! c& W' \ ask roads [ set pcolor white ]+ }' J6 @, ?) D8 p" \# F
setup-intersections2 P2 V* y5 l3 O' _
end
- M: a; ^" E/ d0 X5 F' h7 {其中定义道路的句子,如下所示,是什么意思啊?
+ s$ i2 p7 B( m _1 w set roads patches with5 ]* G( U9 X6 V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% ]: e% f, i7 e% }
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 ?; c1 W" g( E& Q1 ~' N2 R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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