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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。5 U5 X- [; u4 Q
netlogo自带的social science--traffic grid这一例子当中,) d' ` g1 t2 O" [9 c& D
globals
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- R" I+ J$ k _+ H- N, L grid-x-inc ;; the amount of patches in between two roads in the x direction
* ?4 a- Y/ ]8 z% W grid-y-inc ;; the amount of patches in between two roads in the y direction
+ c/ Q7 Y3 n, @1 A acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ [6 \ J( `. T ;; it is to accelerate or decelerate0 i- y" V3 Y+ U- r2 a0 K' U& Q
phase ;; keeps track of the phase# M/ E- w! J3 o9 Z( P, {
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 K5 X1 o4 H$ G8 `* j
current-light ;; the currently selected light
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;; patch agentsets
+ N% h, l0 C' m. u* t" \' _" P intersections ;; agentset containing the patches that are intersections
- H" P2 D; F4 g0 r) `& S roads ;; agentset containing the patches that are roads: o6 M# J* V$ H$ T) y
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turtles-own* ?% i* F0 F0 ?5 I
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speed ;; the speed of the turtle
5 ^4 f0 \' \' i5 x0 i7 [' ] up-car? ;; true if the turtle moves downwards and false if it moves to the right
, l- n1 F* u8 b6 ^2 m8 J( B+ e# h$ ^ wait-time ;; the amount of time since the last time a turtle has moved2 P9 S2 R( u' X5 m* y7 t
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5 _: ~- w* \/ v; O0 kpatches-own$ X* A+ q$ a! W' i2 `
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& p' b% ~- ], ~! t intersection? ;; true if the patch is at the intersection of two roads+ f% s# w ^* U& z* b& d
green-light-up? ;; true if the green light is above the intersection. otherwise, false.: g1 P7 N q7 d& V1 q
;; false for a non-intersection patches.
. x! M( N; ]! k2 Y6 W- x. X% h my-row ;; the row of the intersection counting from the upper left corner of the+ m( J! [! G3 s& {' e
;; world. -1 for non-intersection patches.0 m7 n% _7 O6 U0 \0 q5 b& e
my-column ;; the column of the intersection counting from the upper left corner of the$ F( R1 m3 N9 ~
;; world. -1 for non-intersection patches.8 z* [4 Q+ P8 ]) O0 X1 t
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: H/ N9 i* ]0 k- v4 A! V0 h: w auto? ;; whether or not this intersection will switch automatically.. Q) k8 I+ x# V1 g/ x8 N* {
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
& G/ {% F v! q, b% n;; Setup Procedures ;;# E# W" w# r4 G% D4 D+ V, f/ S1 \& g
;;;;;;;;;;;;;;;;;;;;;;2 I+ E. ]3 q/ ]
9 z' {5 Q Z& K# ^/ Q" v: P;; Initialize the display by giving the global and patch variables initial values.7 R9 v* s: z; _+ z8 `! B: G4 [
;; Create num-cars of turtles if there are enough road patches for one turtle to! v0 I) j! o; ]0 Q' U: K
;; be created per road patch. Set up the plots.
* l. M3 [; p% c6 i& c, b+ M/ J- a. d7 @to setup
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8 g9 |# z% a& `* ?- V& X setup-globals
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" t* z) X2 u. O; i ;; First we ask the patches to draw themselves and set up a few variables
# e4 \; m+ U% | setup-patches
! g. d& A4 e" H: ]7 B$ } make-current one-of intersections
; ?) p9 u4 i2 A1 n) L& W label-current/ q. s6 g$ `$ r
2 j! }# V9 l1 h3 o set-default-shape turtles "car"0 s3 Z& \! Q' X, |( s+ ?
4 A Z! g* @. X; [6 q" F s if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
. H. R8 Z2 V% C0 @ "road. Either increase the amount of roads "% `( ^3 m( ~+ k8 S7 {% G6 ]( X3 @
"by increasing the GRID-SIZE-X or "( d6 Q5 ]% q, ^! j
"GRID-SIZE-Y sliders, or decrease the "
7 h7 n2 W' Z4 R# x" e* o "number of cars by lowering the NUMBER slider.\n"
% A2 i# l% j8 R( I8 f7 H "The setup has stopped.")" d' P: p2 K9 `
stop6 `, o ]* W8 C0 E {
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0 j& E) l5 K# P' `) R4 e# A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% R1 ~) H) l1 n G( e8 i0 |( y
crt num-cars
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setup-cars
' C: U( d& `! M; x) w" Y: L set-car-color
. d7 ?$ M; s0 q5 E& n record-data3 f) [2 W# d3 i% m! d, j4 k
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;; give the turtles an initial speed
# p' e% z) n+ k. }* h7 p+ f2 { ask turtles [ set-car-speed ]
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, y2 v* E# @, Q; E, u( m1 j reset-ticks" ~: u# X8 l) T
end
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" b; X2 ~& R7 {; e6 J;; Initialize the global variables to appropriate values2 A, J* o. |& t$ k& C+ j$ M: J
to setup-globals
. n" v% K1 O7 ~/ g, y6 [ set current-light nobody ;; just for now, since there are no lights yet/ C. f) |* u: W2 e/ V" [1 ]
set phase 0- ], n& G3 }# X+ t
set num-cars-stopped 0
8 M: D6 c( g. {/ L7 Q set grid-x-inc world-width / grid-size-x- ~- i3 h \( z( M: o, Y& v
set grid-y-inc world-height / grid-size-y* u4 e$ A' j1 i( X
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. T0 @& y& V6 s2 c# r& n# w1 a set acceleration 0.099
7 r$ V! ]3 v5 d8 `end
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( T8 s5 X. v& K0 T# n% z& P1 t;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 n$ o" j1 ]1 ^. O# v( v# g6 p
;; and initialize the traffic lights to one setting
# `/ Y/ R4 E9 q0 ]to setup-patches
/ m4 l* T1 @8 W/ u$ y& z ;; initialize the patch-owned variables and color the patches to a base-color
4 t" d9 |' N8 ]6 T* L P* H ask patches
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% N6 x2 f" d$ z2 N set intersection? false9 v& {! \2 E& q# n1 i
set auto? false
* r3 _" @8 ?* R/ U( Q set green-light-up? true. r4 L8 G4 j: W
set my-row -1
$ ?' c( i+ G9 k set my-column -1
+ d) S% S0 X7 E% }4 c- M set my-phase -1
x3 |: M: u+ V$ V1 j set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets# _+ o; `" D* ^6 `5 K/ ?' y3 @$ I
set roads patches with2 p0 o; m) w. e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' S- V1 R7 ~$ ^/ b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' H7 X8 A# ~6 }1 h set intersections roads with% p4 S1 i- O, X O# F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* I9 j8 H1 f0 i5 [2 }/ J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
5 B( U* K7 c# o* _ set roads patches with9 k7 H% q- r; M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 L: S/ z* U6 B1 y, H9 G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 N/ U( i, J$ h( x* _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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