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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。
" i6 _" R! C+ H r) x) T$ Anetlogo自带的social science--traffic grid这一例子当中,
. H& E" |' b4 V7 V. _& ~. Pglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' a! V3 I9 D) H* K( k& @+ J, t grid-y-inc ;; the amount of patches in between two roads in the y direction' d6 O- L* [9 l) [/ A
acceleration ;; the constant that controls how much a car speeds up or slows down by if
( m0 j; d6 J& ]+ V; V ;; it is to accelerate or decelerate
$ ]' A% W( a. z& W! E phase ;; keeps track of the phase
& ~' _2 |. y0 S% M; T5 q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 ^6 T2 H! @% j2 k2 q* s6 b: x current-light ;; the currently selected light
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;; patch agentsets# F. Z8 @7 E" e& | u# V
intersections ;; agentset containing the patches that are intersections
& g. x* r- @/ m7 R; i roads ;; agentset containing the patches that are roads
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turtles-own9 A y( A6 o1 k* X' Y9 U
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- ]- c) o4 p9 q8 t speed ;; the speed of the turtle
. ^0 l; u3 t; V& [" s9 T" h up-car? ;; true if the turtle moves downwards and false if it moves to the right) @; e' f4 A* D. A r6 `8 G" X
wait-time ;; the amount of time since the last time a turtle has moved O6 j* Q: H& ?! _
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patches-own2 N/ c; O. Y: S( Z& E# s
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5 e) h1 r3 z( X% S intersection? ;; true if the patch is at the intersection of two roads3 J# V- n, O3 W
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& B q' J2 O% B" j% W' Z( K- D ;; false for a non-intersection patches.$ e, D4 e3 T9 \3 J0 e
my-row ;; the row of the intersection counting from the upper left corner of the
4 g/ T* u4 H" P+ _& L; l: I ;; world. -1 for non-intersection patches.) p2 l+ ^0 M. E, ~ r
my-column ;; the column of the intersection counting from the upper left corner of the
% H$ N$ X1 `+ ~$ ~% I) ^ ;; world. -1 for non-intersection patches.
# U) G8 a% B) a3 v# i! p- ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.) U' y* `4 J& T R! N! ?" r
auto? ;; whether or not this intersection will switch automatically.; I2 o4 e8 F. H9 r5 e+ @4 ?
;; false for non-intersection patches.1 o3 {! z' s) b- D* K6 ?8 X: ]( q
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3 f5 \8 ~7 }1 h! D4 r) a;;;;;;;;;;;;;;;;;;;;;;
& J, V% z: d, l% |8 k: U& t% R;; Setup Procedures ;;
3 b0 I9 k# V2 O0 R& M/ A;;;;;;;;;;;;;;;;;;;;;;5 _5 Z4 p& p* b4 \; k: u( h
1 s; v* ?0 s& ?' ^. `; h' V;; Initialize the display by giving the global and patch variables initial values.
; G9 b8 P: }7 e& m;; Create num-cars of turtles if there are enough road patches for one turtle to
0 f5 T" D8 L5 H9 v- r# Z;; be created per road patch. Set up the plots.0 Z+ t! j: }. b
to setup
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" J; Q5 a n# H# q" z: p+ _ setup-globals( O, t8 {( ]; B" T
1 W; l5 Z! H8 E) ~/ _; c. { ;; First we ask the patches to draw themselves and set up a few variables, O g! g" q1 o
setup-patches
4 f& C. K4 @; \: v7 k% P make-current one-of intersections! R' i! C7 u/ ^; t/ N' _
label-current/ v1 G8 C9 d% Y7 a9 E. _4 B
+ v7 r0 P- Q+ `7 a t set-default-shape turtles "car"( d# z, E5 A/ {! D; u( `
6 |+ e7 n' }+ G2 v1 @1 ~5 ^$ ~0 m( E if (num-cars > count roads)$ H* \8 L+ B- \! z: j4 G
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user-message (word "There are too many cars for the amount of "* D+ ?5 C5 w* o9 Y8 i
"road. Either increase the amount of roads "" U$ w* e0 t* k" c- @
"by increasing the GRID-SIZE-X or "( V8 _% V+ g; o% F% A8 P' l+ x3 d
"GRID-SIZE-Y sliders, or decrease the "
6 i9 o+ E& c% P9 B1 G$ e \, ` "number of cars by lowering the NUMBER slider.\n"
; k- v7 R. C1 X2 g- w& \ "The setup has stopped.")
/ _0 p0 ~; x; A2 s stop
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$ t$ s, a, t; ^6 d ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( i8 u \; V; J' G7 n. q- ? crt num-cars
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setup-cars% X& D7 L* g8 Q! ?! l5 K8 n
set-car-color) _8 I/ L! _: b
record-data
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" ~' W/ W5 S4 Y- P ;; give the turtles an initial speed
- T! L3 O4 v+ x) b9 P ask turtles [ set-car-speed ]
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reset-ticks2 O2 G% p2 Z1 l: S5 Q
end
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0 E4 f) u! m" w) {8 J;; Initialize the global variables to appropriate values: u; ~3 i1 y0 O' H; Q6 `% S& j2 P5 W' f6 ?
to setup-globals7 [' L9 G6 h/ }8 L1 e5 x) n
set current-light nobody ;; just for now, since there are no lights yet
- s- H; C: z. ^; A4 q, l: u$ V set phase 0
1 V7 i' [' B: J4 n# _% L+ n set num-cars-stopped 0
$ z: z: I9 A* Q; k) W+ s set grid-x-inc world-width / grid-size-x! i+ V' x! |% y" Z& p
set grid-y-inc world-height / grid-size-y
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2 P2 T. W5 Z* ` Y* C ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; r$ C( \: d T2 l# d' p) f set acceleration 0.099
: r- X A1 Z0 ~: r; z- eend
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: _) L! D+ T" C* F0 H* r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 R2 a' T& y, ~" o6 B
;; and initialize the traffic lights to one setting
# k/ f# ~& Z" H( Y6 d# D0 mto setup-patches# k% F+ X% g7 F a
;; initialize the patch-owned variables and color the patches to a base-color+ T' Z2 N8 {# c4 X6 g
ask patches7 D! m0 Y* A4 f5 m7 e# t
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set intersection? false
" X K N l, v# ?$ C) f set auto? false% U# [5 g$ L" A7 n8 I4 U& ^
set green-light-up? true
2 ^7 S, ~$ t( J8 r! l set my-row -1
. L' @$ r8 l# u: i: N set my-column -1
" o( _1 P( x7 K2 E& Z& S9 Y set my-phase -1: a8 [' n1 C9 S3 ]4 D
set pcolor brown + 3( L( g/ X) g$ e! w5 R; C
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;; initialize the global variables that hold patch agentsets
1 }, C8 g4 t: {" @. @* n set roads patches with
4 o; r8 n% d/ Y+ P: {. c [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# m0 D( ?3 L' F O2 K* g( c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) X1 C c3 ^ n; J
set intersections roads with: u+ R6 E& u) p+ O2 a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" y/ S4 H1 D. g$ U. U! C/ ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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0 s& ^0 p2 M8 s, D8 Z ask roads [ set pcolor white ]
% B9 ? r3 A; h# O" {% j setup-intersections8 Q; h) E: i+ K9 X
end
/ ?0 q* n1 ]: s) A) F0 Q其中定义道路的句子,如下所示,是什么意思啊?1 `! u! [+ h! i0 a- I% t* {# f/ J
set roads patches with
! I b; |2 x6 Q& O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- n% i) j5 V3 L$ [ L3 J% y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 O7 D3 |) {7 z
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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