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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。+ H; r$ q2 N2 K' C, E q
netlogo自带的social science--traffic grid这一例子当中,2 G- O ?9 E. B& l2 [/ [ R! y
globals* x2 w* B& J' c: n3 z# E4 X2 V
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grid-x-inc ;; the amount of patches in between two roads in the x direction
9 x# K0 f( i8 h. J% R2 M8 y grid-y-inc ;; the amount of patches in between two roads in the y direction# F8 z" M2 A7 U( ^; e
acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ Z% G3 y9 S$ i! C ;; it is to accelerate or decelerate
# t# \4 Y6 C; p1 U phase ;; keeps track of the phase( u7 Z+ w" m; Q5 {2 X0 x
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& C' f' [! ^4 K7 y* h" q: v" k, h# t
current-light ;; the currently selected light
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;; patch agentsets: ~# L& m( ^$ {) q
intersections ;; agentset containing the patches that are intersections
9 ?6 i% R8 m0 j1 q$ k# ? roads ;; agentset containing the patches that are roads
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turtles-own9 [ L6 b3 q8 ?7 n$ w
[
8 q$ e+ j# W5 l; ? speed ;; the speed of the turtle7 l8 W5 g# y( I& E/ b) c
up-car? ;; true if the turtle moves downwards and false if it moves to the right" K4 X O- b' m5 y- o, {
wait-time ;; the amount of time since the last time a turtle has moved
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+ A1 c2 Q' N( g9 q1 q& }patches-own
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intersection? ;; true if the patch is at the intersection of two roads6 \5 F5 G8 M$ _; g1 Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 h2 ?/ p& U- F& c
;; false for a non-intersection patches.8 _, [5 x. b8 m
my-row ;; the row of the intersection counting from the upper left corner of the, W0 U0 R. |: z0 [% B
;; world. -1 for non-intersection patches.
/ N1 ~+ g8 [5 |8 X' G5 d/ ] my-column ;; the column of the intersection counting from the upper left corner of the/ }& O3 Z7 Y0 }
;; world. -1 for non-intersection patches.4 \) \2 p( U o1 {: A6 H
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* ]6 M1 `6 M7 w7 D" ~ auto? ;; whether or not this intersection will switch automatically.0 e. d8 p1 q. b' C/ X8 c
;; false for non-intersection patches.3 \- h2 \; m" g
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6 |3 j' O; O% e1 X/ g% [& M3 }* j;;;;;;;;;;;;;;;;;;;;;;
) b0 E. g j, a5 ]: y0 G;; Setup Procedures ;;
% j3 q+ U, Q, D8 r5 z: ?;;;;;;;;;;;;;;;;;;;;;;* H a# ?3 l* S) `7 d
9 v5 C% J. D( X6 C0 a0 y7 C;; Initialize the display by giving the global and patch variables initial values.
9 X! Y A8 H: j9 Z/ C+ j5 W;; Create num-cars of turtles if there are enough road patches for one turtle to$ k' u( `8 U* v+ W+ U7 c2 Y
;; be created per road patch. Set up the plots.6 a6 E' P* x. S" w. Y
to setup. K e2 C: L0 c' s8 B+ ~! r( K- }
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
4 B. F9 J& U3 z% ^" C( @% Z setup-patches
3 T; S; ~8 t$ s; a$ Y1 b make-current one-of intersections. Q& l7 M) Q T* p; N
label-current% J( C& L* U; Y8 T) s1 ^9 h- m
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set-default-shape turtles "car"
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if (num-cars > count roads)9 @' i2 J j! |5 m% `
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user-message (word "There are too many cars for the amount of "
9 [: I: f* _% Y& ^ "road. Either increase the amount of roads "
/ p& N, i/ o _; B+ p% F7 h' M "by increasing the GRID-SIZE-X or "% n1 j a1 Z# V1 i. U
"GRID-SIZE-Y sliders, or decrease the "/ W: `9 X8 P. q1 X3 f
"number of cars by lowering the NUMBER slider.\n"
) D5 a/ Q9 y0 d "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- S4 k. W& p, ?+ t crt num-cars; `' N: @# ^ E5 u6 C& q
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setup-cars
4 M) w+ M" z. S' X3 W set-car-color
1 G U7 f" x; a1 Z2 @ record-data. m+ V# p6 F- i: v7 C0 l0 D
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5 ^) r+ k0 `3 e k ;; give the turtles an initial speed( S. I! {# I- T7 U
ask turtles [ set-car-speed ]
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reset-ticks
! i5 y( E; e: y+ A7 uend
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;; Initialize the global variables to appropriate values! g' S( b4 p2 t
to setup-globals
$ L" S) S# @; m( B2 `) `! M# N set current-light nobody ;; just for now, since there are no lights yet
9 K n: P8 ]9 e1 k8 `8 o, X set phase 0
+ X7 M) H# n/ e" S: H( z set num-cars-stopped 0
5 ^# B* d- S0 x0 M4 C- T" D& Y set grid-x-inc world-width / grid-size-x# [% {* o. B/ `
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/ B2 T$ i$ G& k$ @0 K) x7 t) I
set acceleration 0.099! r+ V' Q' O% H* T* C$ p# z5 C* N/ I
end
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$ Y; u* U( C- Q& A" b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* x a# y1 C K/ g, K5 y/ Z3 f
;; and initialize the traffic lights to one setting
& J/ K& R# u/ l" fto setup-patches
% z( \) @; z( m ;; initialize the patch-owned variables and color the patches to a base-color
$ Y. q. ? P: W6 N. @ D ask patches p- ^2 a+ A% I h% i. o. b
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3 v1 g# H9 o( k8 g( v' j% H set intersection? false% F- G! [! v6 G) ]# {8 ~- ]
set auto? false
! j) Q9 N4 `$ r2 @ set green-light-up? true
, x" m& Y) }+ l4 p ~, O set my-row -1
7 }; l3 D$ i& f9 r# k }4 A set my-column -1. R/ ^- t) Y& D" z; r
set my-phase -1
C0 e5 f) a' C4 W- N set pcolor brown + 3/ |, ?% K+ V- d- k+ y4 o$ v6 [
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;; initialize the global variables that hold patch agentsets
6 u) n# s4 @) p& A set roads patches with
j4 B' _8 m1 |# @7 p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- o' C) i0 v6 j7 W# ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 E! M: q+ K9 f v1 ~8 n set intersections roads with& ? o; z# G9 Q* b( S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 i5 p* ]+ D/ M' n; n! w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end# C1 a$ Y" t) |( o$ v% |- w/ E
其中定义道路的句子,如下所示,是什么意思啊?
. b$ g7 Y7 y2 ?$ [/ h set roads patches with1 M) T; b* G& l4 E. O7 f; O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: I J# ^9 g# F5 V/ T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 D% N, r. Y% F0 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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