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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。
+ b7 {. ^- d6 [* }% L9 Y# K0 qnetlogo自带的social science--traffic grid这一例子当中,6 l p3 U7 G! Y) j, A" b! s
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& d' Q: A) h( C8 \ b grid-y-inc ;; the amount of patches in between two roads in the y direction8 x% J* L' c1 H) U1 {" g8 S
acceleration ;; the constant that controls how much a car speeds up or slows down by if
# R' z3 q% J9 n( A; h0 W$ I ;; it is to accelerate or decelerate" O' L" q' P! S/ E' i) u* u
phase ;; keeps track of the phase
4 _4 _5 v# L, }6 P" @ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure z: W3 f* R# ]% a
current-light ;; the currently selected light& R( a/ o) _' j
0 @* N/ I% u. F Z% `/ ] ;; patch agentsets3 x, u& j" }; z( `9 I- i7 O5 `
intersections ;; agentset containing the patches that are intersections
9 n9 Y1 `% `) U( { roads ;; agentset containing the patches that are roads6 O& ^6 p) S. o- y5 I
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turtles-own4 H' V4 ^& G) I2 P
[
( n; T- a/ v+ v8 Y! f6 I: f speed ;; the speed of the turtle0 m/ @3 c9 q6 M& }8 @
up-car? ;; true if the turtle moves downwards and false if it moves to the right, \9 A& q5 `* M8 b* G' 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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intersection? ;; true if the patch is at the intersection of two roads( \# s, `2 D, J
green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ X' ?& I8 A$ s- H4 W
;; false for a non-intersection patches.; F* m- z0 z% o" @' ~
my-row ;; the row of the intersection counting from the upper left corner of the
) a+ X' Y# t$ f* H; @ ;; world. -1 for non-intersection patches.
4 z8 Q7 u- X+ `$ c+ z& L my-column ;; the column of the intersection counting from the upper left corner of the8 f1 ]2 V( T7 E! g* t: R1 a& }0 S
;; world. -1 for non-intersection patches.
- A& b, y/ q' u2 I3 I9 g0 L my-phase ;; the phase for the intersection. -1 for non-intersection patches.! x( |' J* y! Y6 H. L- r
auto? ;; whether or not this intersection will switch automatically.: n3 h5 ^" c8 f2 \
;; false for non-intersection patches.- h4 f r0 {. N4 n) N
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& \! `) G) S9 ~ ]8 u;;;;;;;;;;;;;;;;;;;;;;* r! l! X) ^# K! P$ q( q
;; Setup Procedures ;;( f& }4 p& @# ?9 p/ ]/ n
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;; Initialize the display by giving the global and patch variables initial values.
( {4 |7 B3 `' f0 m& N" _;; Create num-cars of turtles if there are enough road patches for one turtle to
: a3 G# I0 Q6 S; i2 }! |;; be created per road patch. Set up the plots.3 G* n6 f& ~2 y3 V
to setup
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$ F! `' F- y& O1 h! h setup-globals
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4 ]! V- b/ r. D ;; First we ask the patches to draw themselves and set up a few variables8 k6 B) s- P( c! b2 s4 w0 e5 l, o
setup-patches) m# \& @7 T r6 W V3 T
make-current one-of intersections- ?) p9 w2 X% ]; d: p
label-current0 U+ s. t& t( F' B
6 ]* Z( P0 S8 {3 G1 N R! Y set-default-shape turtles "car"
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if (num-cars > count roads)
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$ h/ d! X8 C4 q3 ^ J8 @ user-message (word "There are too many cars for the amount of "
$ C, I- W, m4 P8 Q* u3 q/ ^ "road. Either increase the amount of roads "6 M* O& \- W! d1 L( C
"by increasing the GRID-SIZE-X or "
# Z4 J2 w& I* {/ [3 Q) w "GRID-SIZE-Y sliders, or decrease the "
1 f4 [" U0 a1 P2 _ "number of cars by lowering the NUMBER slider.\n"* @( F$ A7 B7 U% |( J& S/ E8 C
"The setup has stopped.")
- O- l6 @" z0 f! ]+ \$ J3 Q$ ?5 D stop
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" ^5 C$ b$ y* Z) K" e6 F ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" o' v$ j4 F2 m crt num-cars
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setup-cars
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record-data$ \) B1 ^- p9 k8 A+ F- i
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4 y4 [/ [0 J8 z! E+ ` ;; give the turtles an initial speed/ F' N& k+ a$ D. X9 I9 p, c6 p
ask turtles [ set-car-speed ]
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reset-ticks3 ~' T/ v7 o, c0 Z f) ~
end, |; }/ t ?6 Q* j' k9 V
2 ^! N4 y% V: A, u( ~& D;; Initialize the global variables to appropriate values
- u8 D" E: m# ?3 x- U3 pto setup-globals( `+ A8 u- q8 ~; f0 J
set current-light nobody ;; just for now, since there are no lights yet
, {4 H& g4 k' U8 O% E; ~4 S set phase 0
( H% N$ d8 ?9 c0 d3 q4 } set num-cars-stopped 0
; p" L. S. E) w i/ p5 g set grid-x-inc world-width / grid-size-x
* h, q2 {- P+ W( S' Y4 _2 d set grid-y-inc world-height / grid-size-y
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$ D& T {% A4 M7 b& C. s" A ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& v" z" ], s2 Z# w: e
set acceleration 0.099
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, Q6 s7 n7 ^3 X. {8 {9 f, R;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 l9 @) b5 H- E6 l;; and initialize the traffic lights to one setting( Z2 n$ A0 h" _3 ^" W. |
to setup-patches2 I1 d) W% t z3 f
;; initialize the patch-owned variables and color the patches to a base-color
+ Y) x3 O2 s8 l ask patches
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1 m) M6 \' t$ i* t! h set intersection? false
& ~6 G$ N; C' `% n+ r set auto? false, z- ?- C* H" I$ F d/ H
set green-light-up? true
I# W8 Y1 z8 E/ C; d/ F set my-row -1: E( q2 ?* }+ e& m
set my-column -17 S4 d+ Z& S# S' Y. @
set my-phase -1' t8 |/ N0 y- `% a
set pcolor brown + 3
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* d+ s6 O: ^1 X5 b+ Q, M ;; initialize the global variables that hold patch agentsets
. k/ m# W: U5 y3 t/ Y set roads patches with
, X7 f7 ?, i2 Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# ?6 @! x( @( j7 s. ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 n+ V% |6 ^8 A. L+ J set intersections roads with
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(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?
* s3 C/ [% A% K- I/ j/ D: A* W set roads patches with* W1 z# B8 b9 R5 Y N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! H& W8 e5 \6 r7 e0 v% s8 H3 P; V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
X$ Z% @" ^1 M& u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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