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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。% S2 f+ p2 z4 q8 I
netlogo自带的social science--traffic grid这一例子当中,
7 A& i1 O. Q! p, F: cglobals% m1 `/ _( n" v6 v8 J) P
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grid-x-inc ;; the amount of patches in between two roads in the x direction' O( _" @, U' u4 G
grid-y-inc ;; the amount of patches in between two roads in the y direction1 V9 T( x) F% ~. r
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 [% P1 G) f( i# o H( Y
;; it is to accelerate or decelerate r; G1 N# Q6 g$ C' t
phase ;; keeps track of the phase
& W$ ^' ~4 x( h" ]/ p num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure) G' y+ [$ m4 D0 f
current-light ;; the currently selected light
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;; patch agentsets# Y1 x' q& g0 l p2 Q7 }- V
intersections ;; agentset containing the patches that are intersections: A ^( g) d9 f) f! J5 T' l
roads ;; agentset containing the patches that are roads
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turtles-own
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* ~& P% ]4 m ^0 j* [4 G speed ;; the speed of the turtle
& _ O! W& H1 Y: J4 _: A/ S9 V up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 x3 \: l) A5 X! C) s. b7 s$ ? wait-time ;; the amount of time since the last time a turtle has moved/ C! L2 X8 S# V6 c j7 M- t
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads/ `* b/ Q$ k0 K( }( T/ Y/ y: [8 \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 Y3 i% k1 w1 F/ R& O5 X0 Y; [ ;; false for a non-intersection patches.' c% E- f0 T! o0 S, q
my-row ;; the row of the intersection counting from the upper left corner of the8 K$ w9 x3 g( E
;; world. -1 for non-intersection patches.
& c# j2 Z3 d0 v3 W% ~, B my-column ;; the column of the intersection counting from the upper left corner of the
1 O8 S. H/ Q& o. E0 R3 t* U ;; world. -1 for non-intersection patches.& m% e# S% ~" u- x, o
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( P0 J+ f8 I' V1 X
auto? ;; whether or not this intersection will switch automatically.; c' q- i8 @' ` a! d$ j
;; false for non-intersection patches./ G- w1 U* D6 X0 e3 c
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. L3 v1 d7 y1 S3 [# X;;;;;;;;;;;;;;;;;;;;;;3 h$ B9 ^% ]& B
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
2 D( I3 h, ]- y# B6 B( k;; Create num-cars of turtles if there are enough road patches for one turtle to
- V7 P4 ?) F& o! x, ?;; be created per road patch. Set up the plots.; s8 \* r' z. q$ W! G2 h
to setup" F( I4 K" d& y. a
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setup-globals
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2 ^5 _$ h. q* b, H0 [ ;; First we ask the patches to draw themselves and set up a few variables
" B) j3 X7 l# q2 _5 ^. c setup-patches
( \9 e2 P' r6 i9 S/ h make-current one-of intersections
+ O+ ]! B" ]' ~! Y: u, @; n/ O label-current
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" W; ?1 m; l' h5 q; v, ^ set-default-shape turtles "car"
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3 X: r( D: T% F2 I( C4 w; l if (num-cars > count roads)) w4 ]. T& U9 N3 c q
[
/ C' p; q0 S$ | user-message (word "There are too many cars for the amount of "# O2 V! {/ Q8 h$ f6 C* [ b
"road. Either increase the amount of roads "( u) z+ C2 y% d& w8 i5 L
"by increasing the GRID-SIZE-X or "5 m( _0 i, ^* Q
"GRID-SIZE-Y sliders, or decrease the "
y7 |+ s5 p: c+ i+ z "number of cars by lowering the NUMBER slider.\n"6 K1 P2 p. p% p1 {6 T5 \7 p: H
"The setup has stopped.")3 R: R5 y1 v" A2 G6 P" N" Z
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) O9 m6 j0 J; a" V5 n2 q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
% g5 F* ~7 w$ }" `7 z7 @2 | crt num-cars- m- X6 [; g. u" E2 [$ G' }
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: u( v* m! n# ~8 K: s( P setup-cars
! L; t* ^; W: T3 g set-car-color
- k) K" w* b' c- i8 B ` record-data& ]; E' s {' v9 d9 ?
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8 N) X* W0 B8 c* D0 w# F ;; give the turtles an initial speed
1 M. l/ W; x/ N; [# ? ask turtles [ set-car-speed ]
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reset-ticks1 u4 v% y3 w9 a Q$ R) k
end
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;; Initialize the global variables to appropriate values) h7 v2 v" L1 [( n$ h
to setup-globals8 x" F q" q9 U1 \" [5 N2 n
set current-light nobody ;; just for now, since there are no lights yet7 F6 H4 I v2 l0 ~1 r
set phase 07 \# M7 V$ F- z4 t& v& c4 M
set num-cars-stopped 0
2 Z( L8 k: r9 w1 ? set grid-x-inc world-width / grid-size-x
5 ?% i. l: `' D7 J, C4 ]2 k) ^! ] set grid-y-inc world-height / grid-size-y+ N4 o2 D4 d# G0 x7 C$ E( S
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 _( L9 s& L3 T( w+ e set acceleration 0.099
$ X- j7 f: R8 W* h/ W/ P+ ?7 _2 ]end
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7 Z0 i8 S @* U6 \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ I% ?* Z+ ], ?& T1 T4 e, e# s9 C
;; and initialize the traffic lights to one setting+ k! N# h. H2 A& [/ f' B' m
to setup-patches" D6 a" }& }" E% A- ?
;; initialize the patch-owned variables and color the patches to a base-color
4 X v0 H9 d! D+ w/ ?: O ask patches% j+ m' U( P8 i: e8 k
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4 h* b, Z1 O' i- x" f set intersection? false
; h2 z5 B2 B3 t set auto? false$ W y5 y( c" T" i! d7 \
set green-light-up? true
- s8 ^, h# r7 s7 m9 ?1 A) n set my-row -1
* D. K# n" P6 | O) D7 Q set my-column -1
' ^* B8 F4 w; S. T9 w& o' K set my-phase -1' g _ t9 i; s/ ^! t+ g s7 h
set pcolor brown + 3% ~5 @' q2 o. `5 L% U
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$ N( c4 Q& |1 U) C: T! y ;; initialize the global variables that hold patch agentsets
- o- f" V: G* x; u5 b/ l set roads patches with+ P9 {/ c0 ^+ J4 P3 S- r* g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 C! V1 m- S3 V. T6 Z" @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 ?" ]2 l6 g9 L. u
set intersections roads with
" X+ E5 v3 v- O& A2 r. m/ V6 | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- I0 }; [) D3 |7 S; m& Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 M8 u6 x5 r' p2 _+ T% s. p
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ask roads [ set pcolor white ]
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end
4 y o1 A G! I) n4 Q$ C" v2 h. T+ X其中定义道路的句子,如下所示,是什么意思啊?. X& w+ W4 M2 y+ u. x9 Z! t
set roads patches with
6 I2 J$ D. k' U5 ]: W# M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 D( f% | P: K% r' U+ H1 L: F* g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& ?( ^% d" Y8 M0 o' f
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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