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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。
; m5 G5 K5 \+ b* m B: Qnetlogo自带的social science--traffic grid这一例子当中,
. z# x1 E- D# C9 [0 X4 e$ n/ Z0 q6 Pglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
2 G& E/ L) a- w6 t' H _ grid-y-inc ;; the amount of patches in between two roads in the y direction
/ h, S/ n+ v) S; k- F4 o" f acceleration ;; the constant that controls how much a car speeds up or slows down by if# `# \7 l" k- l1 ~( t% v
;; it is to accelerate or decelerate; |" n2 x6 M5 d7 b; S
phase ;; keeps track of the phase
1 `! L4 \& c0 w! v# j7 n5 h num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure6 n2 J) }2 `# x
current-light ;; the currently selected light
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;; patch agentsets
- H# @& B$ F& B" l2 _) b intersections ;; agentset containing the patches that are intersections
5 H3 l ~0 } e Y; H0 l1 b- o& Y roads ;; agentset containing the patches that are roads
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2 {* g( t( z# u' Kturtles-own
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speed ;; the speed of the turtle2 Q0 m5 P7 U) k4 b
up-car? ;; true if the turtle moves downwards and false if it moves to the right
) \- A+ I4 {3 e0 f- q& F wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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b/ j0 Q* i4 U. z4 w# h intersection? ;; true if the patch is at the intersection of two roads
8 Y" h! ?/ U3 m' T% ?3 m green-light-up? ;; true if the green light is above the intersection. otherwise, false." p4 l) Y* a7 }
;; false for a non-intersection patches. N& X! \' }, t/ J
my-row ;; the row of the intersection counting from the upper left corner of the
9 n% `% T( h3 i' t; o4 N, {( N' ] ;; world. -1 for non-intersection patches.
; W0 Z2 y0 M0 W2 z# d$ W5 ~. I/ F' a. b my-column ;; the column of the intersection counting from the upper left corner of the9 a8 L7 [5 A2 J ]/ e7 { s
;; world. -1 for non-intersection patches.
0 O! W6 H. q P: y. Y/ t. W1 B my-phase ;; the phase for the intersection. -1 for non-intersection patches./ s) U9 L& @# }4 A5 f( o6 `1 a
auto? ;; whether or not this intersection will switch automatically.1 u" R8 w4 @/ I* n
;; false for non-intersection patches.
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' V" c; B- ]; r;;;;;;;;;;;;;;;;;;;;;;" n" A* v8 E: z8 g2 ~5 R6 K
;; Setup Procedures ;;7 O" A c/ T8 h/ t! H" I$ Q
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
9 a. l+ [% C6 \7 v;; Create num-cars of turtles if there are enough road patches for one turtle to
1 E4 O& n% ]$ p- |: _;; be created per road patch. Set up the plots.
4 b+ x$ W2 V0 O/ F$ K* y( F" ]' Vto setup
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;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections
% T% Y. i- W4 g# C: b label-current
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q" w4 I I; d5 z0 X& T set-default-shape turtles "car"
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% ? z/ V: S+ h7 O if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "; N4 c. B: C0 t/ N% S
"road. Either increase the amount of roads "
, o6 G# t6 N" o "by increasing the GRID-SIZE-X or "
4 c2 B6 j, Q: D/ @' _) {5 H "GRID-SIZE-Y sliders, or decrease the "
0 X0 E; K1 Q; v- X' t0 v% M "number of cars by lowering the NUMBER slider.\n"8 T+ o. b1 S+ W! i, D4 B% `
"The setup has stopped."): R4 Z& E Q9 { A+ G G- e+ L
stop+ \) f" y! M2 E5 z
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) Y) s- k& ]3 J2 f/ y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' `" b* y6 R1 t2 n2 o: q& I, [
crt num-cars
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# G8 `; U% `+ R- t1 ?# e, ? setup-cars
) L' m& @# Y# t: X. }4 M set-car-color$ {9 F/ I# J* K/ J- ~% b% G
record-data
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;; give the turtles an initial speed
3 S2 D7 R$ U! G# I8 a ask turtles [ set-car-speed ] w) q- p6 O: H3 D/ B& X
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reset-ticks
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;; Initialize the global variables to appropriate values
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) Z- [% F6 m# \" i _3 ` set current-light nobody ;; just for now, since there are no lights yet
2 ?5 `# Z5 R3 N$ { set phase 0
; R0 W/ [1 z4 c* t+ z* G0 | set num-cars-stopped 0
8 m; ?5 R6 a& K/ e' n! y' {4 G9 t1 ] set grid-x-inc world-width / grid-size-x' q) t# Z) g$ f; k, z, f
set grid-y-inc world-height / grid-size-y$ j$ L1 }$ ~* z, t# R# K6 ~
: i' w9 o3 T. ^( X7 j3 X3 V ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! G' R- t% ~$ k& m8 {, X set acceleration 0.099, n9 {( O& D: O! [9 i
end- Q& I+ y; ^! S3 s6 V$ Y2 |
6 i' P5 x' _1 S6 w) @# Y4 t;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 x" }* T' ]& m, J! T;; and initialize the traffic lights to one setting
9 s) O* c- D# Dto setup-patches
* D% S" f2 Y, U1 _5 c5 F ;; initialize the patch-owned variables and color the patches to a base-color
2 D0 F9 d& [6 \ ask patches
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0 y" Q, F, z- w# j0 E+ U* { set intersection? false, \% e- Z0 a$ E' h+ N, c
set auto? false
, G+ o, K: c2 P: x m$ P6 O set green-light-up? true
4 S+ g! s5 o8 I) Q' {; u0 j- q set my-row -1* u. a5 {+ J6 w' Y& Z
set my-column -1, X$ {/ S& j/ ]
set my-phase -1
$ c6 F( Q- J. N0 G3 `( C: h8 a set pcolor brown + 3# C* _7 G+ ]6 j. v/ m
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6 z* Q# I3 Y/ T. a l* f$ b ;; initialize the global variables that hold patch agentsets, @5 @. c6 t! p. Q1 h7 Z
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 [) c+ o9 Z1 p9 N. U- o
set intersections roads with
% J. q* n+ }1 ~% l9 X1 A& Z* } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 o5 D7 _3 o) C' R (floor((pycor + max-pycor) mod grid-y-inc) = 0)] T$ |+ l: \5 Z7 D4 K7 E
- M! y7 F" o4 r) r ask roads [ set pcolor white ]
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end
1 J+ F' B P# V其中定义道路的句子,如下所示,是什么意思啊?
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 C& \4 h2 k2 G: h* S) y- [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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