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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。
' R9 B8 L) [3 G* H/ e$ s7 r7 @netlogo自带的social science--traffic grid这一例子当中,2 j" h; ?: M& p! o+ P8 b
globals
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H4 }8 C7 @& p grid-x-inc ;; the amount of patches in between two roads in the x direction
0 x" h: |$ |" y8 q& L6 \ grid-y-inc ;; the amount of patches in between two roads in the y direction; O9 j+ z7 k E5 U! Q/ z; ]. h" l; U
acceleration ;; the constant that controls how much a car speeds up or slows down by if5 C N4 p s; ]6 S" l, ^' g. v
;; it is to accelerate or decelerate% @7 q' d( P: B2 a3 f, M, x
phase ;; keeps track of the phase8 z( e, t8 u( S% J
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 d2 V$ i8 M% G# B current-light ;; the currently selected light
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3 U. E* P) C7 O% a% X' D& B0 @ ;; patch agentsets
$ p" t& Q4 g" | intersections ;; agentset containing the patches that are intersections8 P2 o/ H& H$ M% v/ p: }
roads ;; agentset containing the patches that are roads
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turtles-own
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4 r6 C! K, p& S) c8 V1 [2 j speed ;; the speed of the turtle2 _: ?. x3 t' r; L; c
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* _3 J j. R- I% ^5 e wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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5 M7 Q; D8 ~0 t* \; W! ~/ {5 A intersection? ;; true if the patch is at the intersection of two roads
* ], z7 e6 @1 ` Q green-light-up? ;; true if the green light is above the intersection. otherwise, false./ }( L4 }+ c( N8 ? _7 L9 ]2 j; Q
;; false for a non-intersection patches.
4 h$ j8 u9 a4 g% q my-row ;; the row of the intersection counting from the upper left corner of the
6 e) u, D/ f, T4 M8 r" Z! _ ;; world. -1 for non-intersection patches.1 X- H3 \5 c3 j
my-column ;; the column of the intersection counting from the upper left corner of the
; w v6 S9 V. B1 @) r8 H7 n ;; world. -1 for non-intersection patches.
2 y9 k. d% d) b- U$ J3 q my-phase ;; the phase for the intersection. -1 for non-intersection patches.% X. y' ]! D w! i: z1 T8 Y3 Z
auto? ;; whether or not this intersection will switch automatically.4 S; N1 n' r' m# d& o
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;4 _' `7 |; b) ^1 y; G: M3 J0 c
;; Setup Procedures ;;
: }3 N' J; O E9 U6 [' E1 z;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.: j% g" v n. f3 E* [8 q
;; Create num-cars of turtles if there are enough road patches for one turtle to
* \7 \3 K# N0 r* f% z& K; G;; be created per road patch. Set up the plots., e, O6 J7 Z' Y
to setup( [' s3 J' i4 L( t1 l
ca
& r+ s' v; @1 t4 v: b, s setup-globals% Q7 Y% Q* I4 c! [" m# S2 b
( K! c+ I# f" E ;; First we ask the patches to draw themselves and set up a few variables1 c8 \( O$ }) O7 f J+ v
setup-patches
]5 }. t9 @8 O1 d6 y: P make-current one-of intersections; K7 F; z7 }. s
label-current( N" ^6 p8 F2 C6 P: E+ i. w
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set-default-shape turtles "car"
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if (num-cars > count roads)3 }) d7 Y/ W9 M8 F. r; Z
[
! C6 Z# r4 M4 h3 e, W0 u user-message (word "There are too many cars for the amount of "( |7 ~" x" _1 }5 o) [
"road. Either increase the amount of roads "+ k0 \( c. u# a6 |0 B
"by increasing the GRID-SIZE-X or "$ G) ]/ f4 y- Q5 ?3 @ z+ p, y0 p
"GRID-SIZE-Y sliders, or decrease the "$ `/ K1 X$ u, ]* o- B( f& Z3 q) M5 |0 q
"number of cars by lowering the NUMBER slider.\n"7 u' b6 M5 L+ h7 [8 ]
"The setup has stopped.")
6 i* j, p6 A Z. @+ h I9 X: q stop# R. l) @& x2 q# L% l
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" z$ ]8 w! ?* J' M* K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( D d6 B* k+ g
crt num-cars3 I/ F3 @; z7 o) a1 ]$ \! T
[
" j8 t5 @. ]7 S- @ setup-cars( R4 z6 x8 ?$ Y- s6 W
set-car-color
. ^6 _9 j" m3 l7 Q' g y& o0 y record-data
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;; give the turtles an initial speed
) a" {5 |& J4 K* r: ]6 r ask turtles [ set-car-speed ]
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reset-ticks
2 W* G/ b. G+ o# p7 Lend
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;; Initialize the global variables to appropriate values
5 N- ^/ x) O% Oto setup-globals
4 j! J% n4 ^. F8 t set current-light nobody ;; just for now, since there are no lights yet
8 ~: N; _4 B3 n- ~5 E6 U1 S+ _& p% P set phase 0
, r5 Y5 K) @0 w+ L! l' G set num-cars-stopped 0
" Z( R9 l7 |& a+ l. n: n set grid-x-inc world-width / grid-size-x
, F$ f4 }- [6 X! h0 ? h g, Z/ C set grid-y-inc world-height / grid-size-y6 |+ F$ @4 |4 {/ @7 p% y& [' j
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary C4 O+ c" t% r% n
set acceleration 0.099! m# ~$ p1 c% U; c* _: m) ?: c/ x
end& b( C+ R$ @4 q6 a4 o
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ T3 L. \* ?) w! ]3 A' a: _;; and initialize the traffic lights to one setting" E/ V# n8 T" x2 m
to setup-patches
0 x, {- q+ N7 w5 q* \9 q9 q ;; initialize the patch-owned variables and color the patches to a base-color
0 o% g, ~' u$ o; v( N2 l ask patches+ T% R/ ?% Z$ A9 K
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set intersection? false& B2 o ?. ^) ~" F- e- {% a: D
set auto? false( X# R5 l# A8 f" O" M2 ?" i4 D
set green-light-up? true3 w- d* k" m1 n9 y8 a7 y6 E l) ^
set my-row -1
1 h" f- f1 ]& A8 T; a set my-column -13 M! n$ G. d) u! D8 y# k
set my-phase -1
: c! S5 k( e% I( j set pcolor brown + 3- V, h& C" n* n) @
]
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;; initialize the global variables that hold patch agentsets5 H7 Q3 o" E! j7 T
set roads patches with
- _5 r* t" \- Z/ y7 t. E9 w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 E" c: Q6 M2 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# Q& P4 A1 P% ^
set intersections roads with
) i$ c! g1 `7 x3 m2 j7 _. m0 X) X [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( D5 {2 E) {' x. a( [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end) g0 @! `3 S9 C8 R+ K
其中定义道路的句子,如下所示,是什么意思啊?
! n8 u; {3 J, q+ o4 X- s9 M set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* _5 z$ D- u) e4 R* M2 F' I1 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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