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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。
$ e4 W; k% _, D0 H( p8 X, x( Vnetlogo自带的social science--traffic grid这一例子当中,
- R8 d# _2 L8 W& N* i Y+ {globals
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6 @" ]% u% K, D2 h/ K* P1 D grid-x-inc ;; the amount of patches in between two roads in the x direction2 X& ~7 @7 m' w8 o6 W# [4 b
grid-y-inc ;; the amount of patches in between two roads in the y direction
1 S1 W1 i1 X% X8 j3 ~) C acceleration ;; the constant that controls how much a car speeds up or slows down by if4 k( u2 o3 z# U5 D) }
;; it is to accelerate or decelerate) V+ T5 U7 u7 T ]% o
phase ;; keeps track of the phase9 Y( Q" g- A4 e6 V) G5 X
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
8 ]" o* y# X2 p: r! B+ r' Q current-light ;; the currently selected light3 F$ w4 u0 L- i" h; }5 M7 J
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;; patch agentsets
; l* `/ l* t6 y+ e2 [ intersections ;; agentset containing the patches that are intersections
% |, l/ j: v- X0 F( d, l$ s roads ;; agentset containing the patches that are roads3 r- S' _. E D! ~, U X, G0 s
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turtles-own
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- j# K+ ~9 L# F5 S( e+ G4 O" ^ speed ;; the speed of the turtle
3 [, M3 @+ b3 [/ a8 I6 H# `; ] up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 ]$ _5 o5 r& X/ c" D9 L wait-time ;; the amount of time since the last time a turtle has moved
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, @, J8 e$ E3 C2 S. f2 G& k' F7 z) {patches-own5 o1 L5 M* Y5 q0 v4 e2 I8 S
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8 R: \! i0 q" U% P: { intersection? ;; true if the patch is at the intersection of two roads/ u+ [/ {" E4 L8 L* \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% G1 t( b7 i* L' G4 M ;; false for a non-intersection patches.
: F# h9 v8 D2 w my-row ;; the row of the intersection counting from the upper left corner of the( t/ x! N) o, W( C) L) F
;; world. -1 for non-intersection patches./ z6 N- S1 m5 v8 P7 [2 H8 _
my-column ;; the column of the intersection counting from the upper left corner of the
& @+ N& A: w) _4 V3 Z. ^4 b6 V8 H ;; world. -1 for non-intersection patches.
1 s5 q& ?! |, Q$ s+ T; \- _* t my-phase ;; the phase for the intersection. -1 for non-intersection patches.( I, }, h. H) H+ A2 k5 Q
auto? ;; whether or not this intersection will switch automatically.
9 j9 `" v4 z Y ;; false for non-intersection patches.3 [9 G+ ~4 V9 j$ d f+ h/ F# q
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;;;;;;;;;;;;;;;;;;;;;;
) D+ ^- E1 j0 l4 e. j;; Setup Procedures ;;
* d' ?+ [( p3 m# c. X4 h, u* O;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.; Q7 ]. t) c; H( U
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 }$ `9 o9 P1 [) a;; be created per road patch. Set up the plots.
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables+ H* v; C1 }3 D/ d
setup-patches
. |+ W0 Y& l& `! P: o, W$ i make-current one-of intersections
: p% a+ |- L9 g- L0 h, u% | i label-current
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set-default-shape turtles "car"0 T' b# Z! D. }! X7 x8 _/ R
+ e, H& B1 H9 R' k if (num-cars > count roads)% t2 T5 w6 P7 u7 E9 h
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user-message (word "There are too many cars for the amount of "
q, X# R# E" Z+ a( g3 s' i "road. Either increase the amount of roads "
3 ?- X, `" v, t' Q "by increasing the GRID-SIZE-X or "3 F, S" j; j3 J
"GRID-SIZE-Y sliders, or decrease the "
$ v, e2 N7 f5 h! ] "number of cars by lowering the NUMBER slider.\n"9 `' j- r$ ~7 e; Y1 B3 L" Q# F
"The setup has stopped.")
0 k) P. |0 G! f: c stop* ]/ f$ y0 `7 V U7 }
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- [2 t' q1 @0 X- H3 i2 Y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
$ K1 j& Y: N, ?: z crt num-cars- c+ d' d$ X# @* p* o
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6 C H5 g3 h% l+ G- b$ H setup-cars
l" |; F% y! y, d( b. D2 h set-car-color) A7 |3 R- H$ D# z t$ D' p0 X
record-data
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0 Z% B' x/ a/ L4 m% _! y ;; give the turtles an initial speed! x7 A# O7 r6 X* Z1 [
ask turtles [ set-car-speed ]
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reset-ticks& q$ D* E: V) F. y9 _
end( v# p- R4 z9 D+ w
! o' M8 V' g5 q$ |0 |6 T;; Initialize the global variables to appropriate values
. x) `* P5 Z `. M+ x Ito setup-globals
0 T5 F& l# `4 Z, |& R set current-light nobody ;; just for now, since there are no lights yet
% H! m" F9 d$ H9 J set phase 0
/ A0 q( O" V3 V2 U Z0 L set num-cars-stopped 0
2 c. N3 t. ]3 Z' Q& R8 | set grid-x-inc world-width / grid-size-x
+ L1 P8 O- P, w8 L. { 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 boundary1 x/ j+ ~2 a$ k
set acceleration 0.099
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8 M3 U* P+ N* }/ R: Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 s. U7 { @$ H" l- i) ~0 u# F" Q;; and initialize the traffic lights to one setting6 h' m8 V; E( P* c. a
to setup-patches
9 Q2 D9 k$ t) e4 e' J ;; initialize the patch-owned variables and color the patches to a base-color: z% ]1 ?! ^& b# x: z( D2 h
ask patches
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set intersection? false. o9 f/ l: u& h" D! [$ D
set auto? false
# ] { b9 a# T$ B6 v$ f+ |+ s! R set green-light-up? true
/ T& n- E5 W; p B; ]" d0 \ set my-row -19 _, d: F6 i D! ?. x
set my-column -10 C- z6 h P" z' {! x
set my-phase -1, J) B h$ ~3 [+ k# B+ p
set pcolor brown + 32 K y8 E* T( e D' R7 D
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;; initialize the global variables that hold patch agentsets
* z% t/ g+ l5 j set roads patches with+ p5 _* }: i! x' B/ B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ k6 U5 q# S/ }8 v, I7 v N5 x3 L
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# H6 I# R) A8 E! K
set intersections roads with
0 ^3 ?* f; B7 ~# m6 g! i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, a+ d: N' T5 a6 f, Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 a5 U( l: u& t- t+ T6 L/ j$ j- Q# l
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ask roads [ set pcolor white ]
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end
) v7 d& f7 g: r其中定义道路的句子,如下所示,是什么意思啊?: A- H9 c& h) ^0 Q1 h/ R
set roads patches with
2 k% i, M" b0 N6 s, J7 V) j$ w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 c- [ \- U9 D/ F% l6 E- ~% F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 w) h% D; e7 I r9 I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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