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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。 j% {& v% m6 x
netlogo自带的social science--traffic grid这一例子当中,7 v- |: {6 n" ] ^1 ~( }" E$ Y# \& y
globals
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& T ?2 Y' m# `- v( z9 c grid-x-inc ;; the amount of patches in between two roads in the x direction9 q( N$ I$ O6 T6 a
grid-y-inc ;; the amount of patches in between two roads in the y direction
( B) o9 Q A: r2 i! _! I# G acceleration ;; the constant that controls how much a car speeds up or slows down by if
0 P) ?, y5 | i4 I. L1 T2 h ;; it is to accelerate or decelerate3 Q+ a$ N9 [7 c, Z* ?0 R9 y
phase ;; keeps track of the phase
* ?: J% v4 I" ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 [, O& s& {5 I; G' k
current-light ;; the currently selected light
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;; patch agentsets7 [( g5 h3 @- T; a) A
intersections ;; agentset containing the patches that are intersections
4 ~5 q8 |5 u: f* ? roads ;; agentset containing the patches that are roads
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( c/ a, c( I/ T- Kturtles-own
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speed ;; the speed of the turtle
, }. S1 p5 u! s- B up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 I. q1 u: C6 f5 Z+ V$ M wait-time ;; the amount of time since the last time a turtle has moved
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2 I. W+ ^2 N9 _9 O. @% [patches-own+ W; s6 i' W) e5 }0 z; c. n+ v
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( F0 y4 H; N$ T$ z: F: ]( L intersection? ;; true if the patch is at the intersection of two roads' R8 P9 O: x% W( @. m1 V
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) y4 }" C. R8 F6 U# w6 N$ `
;; false for a non-intersection patches.
; o- V! o# X' L& d* H my-row ;; the row of the intersection counting from the upper left corner of the
3 e; I0 I% X' X+ o, B' b ;; world. -1 for non-intersection patches.
6 [4 U8 q! ^5 M, b$ a6 l) } my-column ;; the column of the intersection counting from the upper left corner of the) S& y9 N7 r( C( g7 Y
;; world. -1 for non-intersection patches.
% e5 Q a4 R( ~4 x my-phase ;; the phase for the intersection. -1 for non-intersection patches.4 b. H. p8 ^+ v' ^. f
auto? ;; whether or not this intersection will switch automatically.
1 L* V9 B6 \$ ]" s ;; false for non-intersection patches.4 h- u7 r) e: }8 V! S4 ]& h3 p
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, \# E- a0 _( ]4 ?3 N;;;;;;;;;;;;;;;;;;;;;;
. W9 ~( W# V3 ^3 W4 ^% u;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
* l [3 V2 L# p. t* F4 D;; Create num-cars of turtles if there are enough road patches for one turtle to( X% i$ Q7 h0 {" O$ g
;; be created per road patch. Set up the plots.
Y8 Z- h; h/ Pto setup
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setup-globals
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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 intersections9 C0 @8 O$ J& N, Q: T$ [4 H2 {
label-current
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set-default-shape turtles "car"" T; d. S4 `. X E4 Q$ s1 A
6 W) S) ^9 C8 V- \3 m- A0 Y6 ^; E! ~* F if (num-cars > count roads)0 E- B y- S! t4 T6 D
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/ I8 J) A8 x3 R6 G: G1 u3 S( J user-message (word "There are too many cars for the amount of "; S7 @+ }6 l1 w# F1 `5 F
"road. Either increase the amount of roads "8 Q" n% ?5 [) [
"by increasing the GRID-SIZE-X or ", Q2 R2 s# J$ e, S" }
"GRID-SIZE-Y sliders, or decrease the "
' b: W7 c' ]* p) s "number of cars by lowering the NUMBER slider.\n" E q3 X2 U# M p
"The setup has stopped.")
3 m$ o4 J/ |1 _( r5 @ stop, b: k7 c! h2 z- B" j* C2 _9 t7 f3 J
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2 u5 x- C: j! F, I ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 b( F0 Y+ `! d2 w
crt num-cars$ H, b0 j9 i; M8 W
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setup-cars
4 h) f- \! ~% K/ F4 R set-car-color
E- I1 ]4 {6 P) V record-data
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;; give the turtles an initial speed+ G, b8 O" H X- B# x8 T
ask turtles [ set-car-speed ]
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& ^ }# L$ n- E% S8 I reset-ticks
$ J* K8 r& t6 s* g+ T. \7 k mend
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: o& c, _3 H9 Y3 \;; Initialize the global variables to appropriate values
0 T. a. c5 v! I" t K* q7 j& z9 Jto setup-globals
% F9 a$ P" w. X+ r& @0 _ set current-light nobody ;; just for now, since there are no lights yet. e& ?0 a2 m* |: E
set phase 0* a" Q9 E8 }& D: T4 ?8 w
set num-cars-stopped 0% s, t6 q* F# m7 O, l
set grid-x-inc world-width / grid-size-x! V( C/ y" ]5 n; e
set grid-y-inc world-height / grid-size-y4 q2 b: A+ d2 U! }" \8 P0 B+ T3 h
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary! V. z2 P5 c/ L+ E
set acceleration 0.099
# s, M7 n$ b7 N! C0 i/ w0 send
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 C% D$ g, V* X5 j A;; and initialize the traffic lights to one setting
8 `+ M4 T6 Q; z, c1 d- Uto setup-patches
7 W; k# } v% p" ^ ;; initialize the patch-owned variables and color the patches to a base-color
8 A* P, q# n$ o: L ask patches
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7 n$ D$ y. `3 F' L# Q8 K set intersection? false- P' I' `8 [9 i6 p0 k
set auto? false
9 @! K9 k, ?6 Z$ h0 N set green-light-up? true
) a$ V$ t+ r$ F$ P8 j/ J8 u set my-row -1
' K9 L3 b7 v! X" c5 l8 P set my-column -17 X$ g0 Z- Z9 N8 H
set my-phase -1
( W: f {2 D/ p% ]2 X4 \: M5 o$ D+ ` set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets" y& E4 x Y8 a1 T# t
set roads patches with4 ] G7 d. E; z1 v$ P6 G/ x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ J- n7 Y1 P! e ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; Z9 s3 }6 X& g y8 ?9 f set intersections roads with6 @' P2 G/ j/ U# N6 R0 _: T2 @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# i3 b: H {+ _% B/ |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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) o: i3 E7 d( K% g+ _# W. K% e+ X! i其中定义道路的句子,如下所示,是什么意思啊?
( q/ U# H5 k# B& Q! _3 E0 r6 ^ set roads patches with" _/ d) \4 S/ ?: m9 w3 o) f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or b d ~% B9 j( j6 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 s5 f% z R4 I, ]/ s3 T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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