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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。; E6 b- q7 V* R# I6 l
netlogo自带的social science--traffic grid这一例子当中,: p; S' V7 G- @4 w& t/ ]% l
globals+ G1 e8 S. g" N8 I h
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( K. `+ q2 [* P- r7 n; w grid-x-inc ;; the amount of patches in between two roads in the x direction
& s: J3 i/ H! v: G& P8 n: b+ |. Y$ o grid-y-inc ;; the amount of patches in between two roads in the y direction% w' N5 X5 @/ |' J
acceleration ;; the constant that controls how much a car speeds up or slows down by if2 u& y" G$ `2 `; r( E
;; it is to accelerate or decelerate0 s) ?! C7 J) ]" W5 H: _
phase ;; keeps track of the phase
- q, g# G* Q7 m2 R; K1 q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
/ T' D, j4 y% @/ }* z/ ~ current-light ;; the currently selected light; G9 t0 Z4 q/ z* D6 n# \1 Y' ^# ?
3 Q; k4 ]/ }( g5 D2 `, P ;; patch agentsets
7 r) ^7 A7 \7 U intersections ;; agentset containing the patches that are intersections
3 R& g5 A$ H$ K$ Z+ \ roads ;; agentset containing the patches that are roads' _; B1 N) B5 @! e! @& U+ _9 E
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turtles-own: }/ |9 T5 y7 @- z! r' J
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) r* t+ }) B: ]4 z7 g speed ;; the speed of the turtle
6 d5 i9 } O/ ^* O0 i9 M up-car? ;; true if the turtle moves downwards and false if it moves to the right9 i$ p* s& A6 t3 H! G! J. l
wait-time ;; the amount of time since the last time a turtle has moved. b( P* p% e+ U) m* t; ]/ K; Z
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patches-own) K4 ?8 ^$ B j( K1 v
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intersection? ;; true if the patch is at the intersection of two roads
- {( N5 ^6 N# k% m U# x green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 {0 O( t$ ~, ^* C
;; false for a non-intersection patches.
! l1 U8 j5 o& t( } u3 d9 M my-row ;; the row of the intersection counting from the upper left corner of the9 J+ c- F5 ?" h( S5 C$ p- L$ U5 S
;; world. -1 for non-intersection patches.+ J( e! N4 ` m
my-column ;; the column of the intersection counting from the upper left corner of the
1 g0 b% K2 }) v6 m% V T ;; world. -1 for non-intersection patches.. M F0 t" j$ l2 g, C1 K
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- {' Q2 Y8 ]% M _/ f4 m2 d3 F# {- B auto? ;; whether or not this intersection will switch automatically.5 B1 g! G5 @0 l2 y/ e2 o
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
# k+ a/ @% \5 Z7 g b;; Setup Procedures ;;
: ?: [# H7 h0 T9 A7 l3 b;;;;;;;;;;;;;;;;;;;;;;
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/ H6 s; Z8 o5 ?0 j/ r7 y1 n* ];; Initialize the display by giving the global and patch variables initial values.
2 | s/ x% [+ c- i& S;; Create num-cars of turtles if there are enough road patches for one turtle to0 K. ~5 Z/ K$ A
;; be created per road patch. Set up the plots.4 x, K N; W1 O
to setup3 q7 E5 z( `1 w. _
ca
1 ~; z0 X3 J8 \) {- t/ p setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
, V8 ]5 m9 P) l& A/ u7 w I, l setup-patches9 {4 x& G* h& f- \9 C
make-current one-of intersections* I' K4 }/ b% T) e2 E$ \/ L7 c! N
label-current
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- Y" e& ]7 h& T% v" s set-default-shape turtles "car"
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if (num-cars > count roads)( o p/ z* Y2 n8 U
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user-message (word "There are too many cars for the amount of "+ O1 Q' y+ F; b$ z0 ?
"road. Either increase the amount of roads "% T# a$ L% ~; h- G! X9 ~3 U! _+ ^
"by increasing the GRID-SIZE-X or "4 h0 K" P( {& Z; D
"GRID-SIZE-Y sliders, or decrease the "
- N7 y6 b+ v* d4 s9 j5 } "number of cars by lowering the NUMBER slider.\n"
2 i; a9 G& z# O; g3 Z "The setup has stopped.")
$ Z+ e" H" Y g3 @% A6 Y e. q stop: n5 c1 O l- C. ?9 O0 o! ~
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9 _3 i+ m3 p' e; x8 f ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) R7 D6 \# {- c9 W0 D, M
crt num-cars
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setup-cars
, g* e: Z) I) S3 ?% n1 o/ c set-car-color4 @% ]9 ~) s( P" ?$ l
record-data/ f! C. Y( h0 j2 O1 g
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+ ?5 ~7 [$ c8 K9 n. P ;; give the turtles an initial speed- J5 U' K$ H' _6 A J3 X, Y
ask turtles [ set-car-speed ]
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! M0 C* i( [1 b" P2 ^ reset-ticks% M- E' N o% g# O8 S1 r+ n" x
end* N) A9 ?8 r0 e, J- `
& u2 ^/ l V8 W" i! J" b;; Initialize the global variables to appropriate values2 U4 D- Q( a: b" K8 j/ l, W' M
to setup-globals
7 a/ A( e: J2 O) q set current-light nobody ;; just for now, since there are no lights yet
% N: J: B% u/ y! ^* {0 ^: m set phase 0
5 K- j! {# v' L set num-cars-stopped 0* D! n$ |% ?' V
set grid-x-inc world-width / grid-size-x
) a. |. |2 [8 M: S) t7 i ?( c, R 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 boundary: B$ y ]9 V( v1 R6 Z, y
set acceleration 0.099; U* z, v; I8 b& H
end* f t3 f! S" T. D
% ~6 H ?1 A( Y% o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 Z% ]; z6 O. c) _;; and initialize the traffic lights to one setting# N# R' ]* J: f$ a
to setup-patches
/ ~. S/ w1 [9 n5 t8 V& F0 z ;; initialize the patch-owned variables and color the patches to a base-color
& U7 w7 l$ z! M2 {& q ask patches
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set intersection? false
q# Z; Z0 ^8 H% [0 ~ D" P- \ set auto? false) E+ E8 d3 P' I3 v- Y. N. Q2 o; o
set green-light-up? true: X8 S3 R9 w) o/ q8 ^
set my-row -10 v2 D7 ]" G9 k0 W- [5 ?1 V4 k
set my-column -1( c0 `9 U! h7 B0 R/ C
set my-phase -16 y1 ?4 X. k. J' p/ a2 G
set pcolor brown + 33 A( j' ~7 I1 l8 Q7 V* V g
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5 a# A8 b' U, m) x+ c9 } ;; initialize the global variables that hold patch agentsets- U/ G6 c2 b R5 |+ z5 r
set roads patches with: G; W$ y5 u a/ q5 c1 A' R) r B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) c! P. m* g, P: X; I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ S" G# V4 w6 ~6 M% `) t4 h
set intersections roads with
9 {& z$ z9 q/ W' u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 j8 x; l4 F! ~% k8 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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: S" p* U9 a1 ^8 g& T7 }; o ask roads [ set pcolor white ]
. s+ e9 ^5 m \5 F7 w setup-intersections
8 q4 [% D( p6 ? aend
- V. b& n- o' P7 x" z/ `6 h其中定义道路的句子,如下所示,是什么意思啊?
. p8 s) B1 i6 [ a; S, l3 l, ? set roads patches with5 K; @5 o% S0 P9 B( M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ D2 E( i. ~& e+ w+ l, V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) X& R) J: s' c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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