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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。
& K, x: X8 C, [1 o# A: Enetlogo自带的social science--traffic grid这一例子当中,& J3 h" P% q' X: [, S3 N
globals
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! b8 u( u- {) k- z grid-x-inc ;; the amount of patches in between two roads in the x direction( {0 S. o5 J. U2 A R; D
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 e' P+ S4 K! E4 w( P- l acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 ?1 A/ ?/ P) P& V/ P ;; it is to accelerate or decelerate7 t, |( I8 O% U- `4 b
phase ;; keeps track of the phase3 ]4 b' i' V y) d# K
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) m2 j$ J3 M2 ]+ d4 ^ current-light ;; the currently selected light
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;; patch agentsets
9 |8 u+ a- `- y% C% _! b intersections ;; agentset containing the patches that are intersections/ h/ B8 |2 e$ Z9 R0 C
roads ;; agentset containing the patches that are roads
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turtles-own
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, p6 I# U" p0 j; ]/ t r& t speed ;; the speed of the turtle i* n+ a7 ]) M
up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 l% V X/ d5 P3 t wait-time ;; the amount of time since the last time a turtle has moved4 k7 b1 M* q7 j5 f( i/ J
]
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6 F# k7 C6 z, `( Y* Tpatches-own
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7 ^3 m }# V s4 I( m7 Z q intersection? ;; true if the patch is at the intersection of two roads: q1 X! [5 F$ U# F4 ?6 z2 D% B
green-light-up? ;; true if the green light is above the intersection. otherwise, false.) K V* P2 D' N! g W( ? Z
;; false for a non-intersection patches.
5 @; O3 O4 A) V& W% Z1 } my-row ;; the row of the intersection counting from the upper left corner of the
3 v# q& `/ q( X4 W. R1 H! Y ;; world. -1 for non-intersection patches.
& ]- Q* b7 {% x+ q! k my-column ;; the column of the intersection counting from the upper left corner of the! R$ G& ]9 ]% B8 M
;; world. -1 for non-intersection patches.
% t7 L/ ^- a6 }" G* t( k8 M my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( ?' ^9 e3 r( _' t auto? ;; whether or not this intersection will switch automatically.
9 r @9 ?. \' E9 A ;; false for non-intersection patches." [4 h+ J5 b$ U! W; \" E
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; L3 ?% U& J3 f8 x4 p;;;;;;;;;;;;;;;;;;;;;;
! ~2 [+ x# _7 \9 a1 d2 d0 e;; Setup Procedures ;;
$ z( _! k+ S/ O5 h2 _4 g$ r;;;;;;;;;;;;;;;;;;;;;;( h' B5 h- @6 e' @
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;; Initialize the display by giving the global and patch variables initial values.) H' _# @8 c3 ~, [& |2 k5 l
;; Create num-cars of turtles if there are enough road patches for one turtle to
# A5 p! P: b! y. g;; be created per road patch. Set up the plots.6 H7 D0 H" G6 s6 g3 @$ ^
to setup
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/ \ N5 A% n% \0 d' K9 w* q setup-globals
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2 _; ]4 n# y0 z$ o9 { ;; First we ask the patches to draw themselves and set up a few variables3 @$ F( |2 m& g: }/ H
setup-patches
% K- W0 ?4 G5 D6 g0 C make-current one-of intersections- _, }9 R- |2 Q+ `
label-current
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* o3 Q' W* m9 J8 m set-default-shape turtles "car"" n5 X( ^& m* ], \5 L# l9 H
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "5 \+ R+ ]1 s0 F4 I" X& Z E
"road. Either increase the amount of roads "
0 Y1 ]* b9 s: b6 X5 E% g "by increasing the GRID-SIZE-X or "
F9 F6 ~$ \! P! ^3 F "GRID-SIZE-Y sliders, or decrease the "! s/ c' l: V. P! r0 U
"number of cars by lowering the NUMBER slider.\n"
# f; v% d1 ~6 ^: Z; g0 O4 o0 N9 F7 t "The setup has stopped."): f" R" s6 o5 D% O4 Q
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 @. v& c2 A6 i% ~3 Y6 K( i
crt num-cars
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set-car-color
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: {# k& v* k: b% q" O% B ;; give the turtles an initial speed
2 d, [" w' D6 s0 f p# |. K ask turtles [ set-car-speed ]
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reset-ticks
) U; F& S: z O5 l) kend
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) B3 r7 F- p" ?) }4 w;; Initialize the global variables to appropriate values
: i' L, i4 H6 {to setup-globals. }& V$ s* G$ G3 K3 p% H
set current-light nobody ;; just for now, since there are no lights yet
) h( _' `/ \/ `% d `7 O* e set phase 0
% O: L/ T0 T' P* [ x1 K set num-cars-stopped 0
/ s3 W0 @) l& g/ W j3 F4 R% @ set grid-x-inc world-width / grid-size-x
, `/ i" v( `" K4 W set grid-y-inc world-height / grid-size-y
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( s4 f. m( N3 j2 p, l2 R ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" g! Q* ]1 F" z
set acceleration 0.0990 T7 d, {9 h K( S2 \; `) @! ^/ ^
end r, K7 C) V. s4 g# M$ C0 h3 W' D
/ ?* i- Y- M8 P) o8 ^4 c;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% h8 L8 M2 Q+ {;; and initialize the traffic lights to one setting
) h S- Q- ], v' \' e- tto setup-patches
: W3 Z! n1 v+ l! ^ W9 L0 d ;; initialize the patch-owned variables and color the patches to a base-color
. T/ A9 C H {1 ] ask patches% t4 w6 A5 w# M" l
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set intersection? false1 ]+ L: b8 N" y9 q) b6 A5 K
set auto? false6 q5 J' j( A4 ~$ _& F
set green-light-up? true; e' J/ @4 g2 y5 H! t
set my-row -1
0 }) ^% C( e# c0 V" H) R set my-column -1+ Q, a3 J7 w7 |6 u5 ^
set my-phase -1
% H7 w& L2 ^% G1 P; r set pcolor brown + 32 b9 {; r9 k! `. r+ O
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;; initialize the global variables that hold patch agentsets, s5 g4 I% p8 w" g2 C8 w
set roads patches with
; F. \7 M' Z" ?; z/ ]" f" q3 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; h: Q( T7 e7 {8 e% I; P% [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 z. P, c6 M7 n6 \, v' `$ E4 X set intersections roads with+ z B' P- D; U. K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* b$ `" X8 O. V& B+ B9 e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 E# b0 j$ i1 V }: |
* b' x( ~, }: D8 ]3 w. [ ask roads [ set pcolor white ]
/ y* @- c; @9 j q0 \ ] setup-intersections
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- S7 z1 ]9 `" S; G其中定义道路的句子,如下所示,是什么意思啊?
; Y4 u; u1 C, W6 d- U' {0 N set roads patches with2 \- {% Q- K, G4 F8 G* P5 }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 j/ j5 B7 O+ ?9 ?# P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% g: g% n7 X1 M e) j! @
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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