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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。
; U" s+ a, d C' gnetlogo自带的social science--traffic grid这一例子当中,) Q8 x5 z1 g! f. B% p6 h
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 Q& q2 ?$ Z6 l7 y8 }, U6 p# p grid-y-inc ;; the amount of patches in between two roads in the y direction3 [2 g1 x+ f# Q4 [6 \& Y
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 v; S; L9 p5 b) I
;; it is to accelerate or decelerate
* r3 E0 L% b& i+ ^ f5 S phase ;; keeps track of the phase$ b; S7 L. a9 ^4 c
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 M `: v: h/ |
current-light ;; the currently selected light
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;; patch agentsets7 S$ }& Z' o8 G) O, R
intersections ;; agentset containing the patches that are intersections6 S1 q6 B- j. ^
roads ;; agentset containing the patches that are roads' Q( ~9 Y8 z6 P! K
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turtles-own& H- }6 Z- Y' x2 ?4 G
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speed ;; the speed of the turtle
0 S( L. q) F9 y5 y6 u up-car? ;; true if the turtle moves downwards and false if it moves to the right, L1 G! F" F, C. o# k
wait-time ;; the amount of time since the last time a turtle has moved7 ^ A' Y* b5 b. ~
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads$ Q/ c' H. T! p. M0 U; j4 b" k' e h
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' v5 J" E: y; m% L O4 s ;; false for a non-intersection patches.( M0 S7 y3 g6 u* O
my-row ;; the row of the intersection counting from the upper left corner of the
* h" U6 \3 `! t* O# Y: [3 s ;; world. -1 for non-intersection patches.) h5 Z: B$ G' C+ C8 g
my-column ;; the column of the intersection counting from the upper left corner of the
* ?6 z2 B8 X, C ;; world. -1 for non-intersection patches.
4 O. ^# i6 |/ Y- _+ W7 u my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 c2 n1 B5 y* A e' ^3 W7 g3 H
auto? ;; whether or not this intersection will switch automatically.8 z) H" J/ }5 A; j0 Y) J
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;" ^. o; P9 L( k I! z+ N
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
; b; S: F! f2 w: d/ B' F;; Create num-cars of turtles if there are enough road patches for one turtle to
& S+ o0 D l- |+ s* D( C;; be created per road patch. Set up the plots.2 j& P) X G7 P; W
to setup
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& t! r1 s$ p6 ~# p5 ?" Q W setup-globals% Z5 [. \( c" t7 N
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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
8 ^% |; G2 |+ z7 u" v label-current3 l8 z3 y' f: f9 s
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set-default-shape turtles "car"/ X2 s# Z6 o% l$ r
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if (num-cars > count roads)! B3 {& p2 P6 K, K7 g7 U9 S
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user-message (word "There are too many cars for the amount of "+ E! [, v# \* U; k3 K
"road. Either increase the amount of roads "
# r/ W- e& h# Z" |3 | "by increasing the GRID-SIZE-X or "
; ~6 j8 T5 q) v3 G3 \' D "GRID-SIZE-Y sliders, or decrease the "
9 v1 l# M; e- r9 Z/ z6 u% y$ b0 J "number of cars by lowering the NUMBER slider.\n"
% s: e, n5 U- F5 d6 j* T: j "The setup has stopped.")' b" O$ l5 Y* o: H& x8 R
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ b6 I( G/ d" J, Q; @* n
crt num-cars' M- A) S* X9 V) J
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+ i' `( e+ v: h+ H0 T. N( k set-car-color! n/ O+ _3 b D! q: u
record-data/ J. k/ @. J7 S/ h
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. m+ e+ ~0 T3 G+ v1 k5 T ;; give the turtles an initial speed
( m) X4 S, C; V9 t" G8 j ask turtles [ set-car-speed ]
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reset-ticks: Z- A9 K1 P' K4 H$ V& @
end- n9 R2 H+ T& }# }; d
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet) m8 D- G# n9 e" }7 c
set phase 0
: z2 s* E4 d% I6 \ set num-cars-stopped 0. v2 ^) E p' b3 z" ]; `' C
set grid-x-inc world-width / grid-size-x
% z$ P/ G. `6 z1 j( {8 X5 O# N/ c set grid-y-inc world-height / grid-size-y6 Z9 }$ u0 U. t: |+ {" d
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 ]$ ~8 k2 l7 O' V5 e# O) {
set acceleration 0.099, q( E# e ~7 ~5 H
end: q% w! z% h8 h# v) {5 P& j- y
3 x6 u* @. p l1 _: `;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ s2 A9 x) E! P+ l6 v' Y
;; and initialize the traffic lights to one setting
m* h7 [, f: \& wto setup-patches
( R6 ?/ ^1 K. n ;; initialize the patch-owned variables and color the patches to a base-color2 c% j0 L6 }; x( a% J' @+ f$ R, W
ask patches, }9 N9 Y. h" [9 ?8 S: H! p
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set intersection? false* i! C2 Q% Z% U0 g
set auto? false
' w) c- p9 H- P4 L b set green-light-up? true* z& v0 z @* f* A( H
set my-row -16 R2 t" v$ P( g% Z; j
set my-column -1
5 u3 d, e4 @% s% B f& a% } set my-phase -1
. o" ~: o" e: R |$ b! y set pcolor brown + 3% Z b6 H3 T$ E: Y! n+ B4 v& _
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;; initialize the global variables that hold patch agentsets
( N$ ?& {$ a1 W, U. n7 ^ set roads patches with
2 F2 Q1 J, X4 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) P$ U" J% a- I! a. r( Z8 b' R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 T4 n7 d) @! r0 \0 V set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# s( D" s6 Q: ?8 O& n$ [# m* n
/ p* y; I5 Z# K' |" v ask roads [ set pcolor white ]
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end
# t( H/ {5 P* W! H% S/ J$ Q9 U: @其中定义道路的句子,如下所示,是什么意思啊?& K4 O0 a% i5 |0 C! n
set roads patches with% v& c) k; `6 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 i: c w) y( f2 i; u& |* l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( w3 H4 o1 M8 @- d% o, ]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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