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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。
9 z: d( }+ s0 W' } _netlogo自带的social science--traffic grid这一例子当中,7 D. a7 h1 k, B6 b/ `8 y
globals
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+ A- [1 l3 l' Z grid-x-inc ;; the amount of patches in between two roads in the x direction
, ]' v$ _! c( `7 t, x! l, n { grid-y-inc ;; the amount of patches in between two roads in the y direction8 K! P4 s, l' }$ s1 U
acceleration ;; the constant that controls how much a car speeds up or slows down by if
~( N6 i, o4 z% \2 D5 E ;; it is to accelerate or decelerate) N) b4 V0 n; F# p, n: L
phase ;; keeps track of the phase! k$ _2 f& ~4 w' v3 s& W
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, X$ h$ f7 A. f$ m8 z
current-light ;; the currently selected light
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; G4 [2 m& E& N* e% ? I ;; patch agentsets
x2 n& R, |9 C& O: y; R intersections ;; agentset containing the patches that are intersections
; T0 X; z/ d) J, z roads ;; agentset containing the patches that are roads
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turtles-own
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3 q( g1 _9 ~/ Z- z speed ;; the speed of the turtle
; I [8 q* @! p7 E) | up-car? ;; true if the turtle moves downwards and false if it moves to the right/ ?, n. |# e4 ] V2 k; d: T, P [
wait-time ;; the amount of time since the last time a turtle has moved! e4 M6 Z/ Q3 P# d4 f1 d
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0 J4 e g! w0 M$ X3 A2 b9 ?patches-own! G4 y# S; u) R& b7 g& `. Y
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intersection? ;; true if the patch is at the intersection of two roads
/ k2 G. d( H ]2 f green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( ~' |" z& S2 ^+ U R. z3 h J/ u2 B* Y ;; false for a non-intersection patches.
) _# A- V3 j9 ], h my-row ;; the row of the intersection counting from the upper left corner of the" b" W, l8 L$ x/ c
;; world. -1 for non-intersection patches.8 M% u+ Z7 O! T9 e
my-column ;; the column of the intersection counting from the upper left corner of the5 z( L w9 m3 E* J
;; world. -1 for non-intersection patches.
" p! a4 t' I: t2 v9 t" h my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ ?$ j* u+ X# h: S auto? ;; whether or not this intersection will switch automatically.7 q1 ^4 T% j, _% G b, I. B. D
;; false for non-intersection patches.
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+ A2 ]& q( U% Z+ l: L0 l0 `' P3 |;;;;;;;;;;;;;;;;;;;;;;
% G) ?& n, c5 r* u;; Setup Procedures ;;
G" N8 B3 x7 P0 D2 W6 z;;;;;;;;;;;;;;;;;;;;;;+ G+ l; _6 M! a9 G* a4 Z
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;; Initialize the display by giving the global and patch variables initial values.4 ^4 I! O+ s! ?/ Z, _9 x+ Y
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 _/ |' G7 x4 `1 v) j! R1 m( U;; be created per road patch. Set up the plots.# E" g9 F# W$ x* }7 s$ a, i
to setup/ d/ A8 i$ Q3 [: [7 O' x W+ j2 d! u
ca
& l. m4 J9 {( S$ g setup-globals
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7 v5 f" q! j. D1 ^; Z* F0 Z ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections/ ]% h: L' _2 m. R! M V
label-current
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set-default-shape turtles "car"
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1 _+ s6 V0 G' Y. I, m* ^+ u if (num-cars > count roads)
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8 P, [$ J4 z! U# E- V- ]! u user-message (word "There are too many cars for the amount of "
1 [% _8 B C+ D' W3 ?( j/ g) f7 Z "road. Either increase the amount of roads "
% o7 a4 r8 V8 k( ] "by increasing the GRID-SIZE-X or "
( r* i' L3 C4 \# q. A6 a "GRID-SIZE-Y sliders, or decrease the "
: Y p6 L; s7 H( I. W "number of cars by lowering the NUMBER slider.\n"7 ]. A9 y$ l7 N2 i$ C' {1 }
"The setup has stopped.")8 ^! z8 O8 f4 j' f7 d! M
stop9 N1 }) b$ M, r
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 D' C% m v* w. Y6 |6 P( i8 [
crt num-cars: |3 Q) i3 {7 M8 A8 ]
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; f l& Q: s, s; A$ I9 v) f setup-cars
3 `7 b( O5 X6 S0 A1 F set-car-color+ E6 z( j+ k! m
record-data; L8 |' a2 m+ j' w! ?: u
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;; give the turtles an initial speed# L8 W/ h' G' S
ask turtles [ set-car-speed ]
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" `) R3 c/ `( B reset-ticks
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;; Initialize the global variables to appropriate values
! ?* ?5 g8 r+ m3 Wto setup-globals
2 b0 d7 d+ l; {; V- q) f1 D8 A5 Z set current-light nobody ;; just for now, since there are no lights yet
0 C: s3 ?- Z9 f P set phase 0
$ F1 g1 r S5 X7 h set num-cars-stopped 0
' _& ]: l& O+ f, s1 q5 O9 B set grid-x-inc world-width / grid-size-x6 y; i' }$ G- b9 D+ S
set grid-y-inc world-height / grid-size-y
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/ O2 @4 }0 g9 h I$ h ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ q% P# T4 b h; H) Q; }
set acceleration 0.099# s/ b, u( k K- ]( V/ y3 M
end6 C( i1 p3 x* C& I7 r% M
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 F% B; P* v- O$ k# y, _4 ^" W1 [;; and initialize the traffic lights to one setting0 x4 a- f8 e9 [
to setup-patches
) u3 M0 d7 m! ~$ Q# }. D# m) [; R ;; initialize the patch-owned variables and color the patches to a base-color; R9 _% Z6 j. h2 B6 H
ask patches- ]$ S; c X( |" z9 |, V5 t9 p
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set intersection? false
$ z- |8 s3 h9 P( N' R0 Y& \3 p* O set auto? false
$ n& ~& U. ]: F0 ^; E8 U set green-light-up? true
7 H5 d2 W' V0 C) d' j8 D set my-row -1
7 h$ s6 i/ q8 @ t/ N8 ] set my-column -1
b2 W0 {$ t9 h% P# d2 e" \9 Q0 x set my-phase -1
4 B* F8 m& }" d" B& C set pcolor brown + 3! A% W7 n& W3 d
]
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8 C( J: l. ]( p ;; initialize the global variables that hold patch agentsets
* p0 j! P9 ]* S L @ set roads patches with0 o$ X/ P, q0 J0 m% _! J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 z; R& z5 O- x+ L. C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 T, {* D' ]$ A3 @' u7 y! q8 h$ E set intersections roads with. N$ x* z9 x& y+ {' V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: f; `! x/ C" A2 o n6 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ m4 q D. o( w: b* V
; I6 J6 x6 U, a: z+ E6 }0 g ask roads [ set pcolor white ]! o/ j# u8 K/ Z. G- H
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?; M, P# f( I% b+ `% P( |
set roads patches with
Z" v0 k/ e# p, S% h3 v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; [& V3 h4 W% j3 h& r3 v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 t5 U! W+ @" ~: e& Q: m; X8 ^( ]
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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