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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。
. F5 E* P; a3 J- Dnetlogo自带的social science--traffic grid这一例子当中,- y5 s) g1 ]& z& v( j5 N# q* U
globals2 }9 J7 X/ B8 u: T1 p; J; K1 p
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grid-x-inc ;; the amount of patches in between two roads in the x direction
* I$ |3 k- T9 T% L; k1 v6 ^ grid-y-inc ;; the amount of patches in between two roads in the y direction
! o. A: u! H7 X acceleration ;; the constant that controls how much a car speeds up or slows down by if
' A& i/ j1 c; x* D, ^$ `1 y* }- k ;; it is to accelerate or decelerate
) \# v2 s6 Q& K) U$ Z. e phase ;; keeps track of the phase! o& m* A! }3 [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) i0 t3 b2 R) l4 B5 B0 f7 o1 m: S current-light ;; the currently selected light
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3 b& k4 j% A/ N& U ;; patch agentsets8 K, ?# ~! [: Y) R* E
intersections ;; agentset containing the patches that are intersections
' x: X1 g; a6 X+ U: n+ R- j( x roads ;; agentset containing the patches that are roads
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4 N w7 r* ]/ N: Pturtles-own
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5 q* X8 Y3 a) Q! t) L F speed ;; the speed of the turtle; {: r& `3 B& ^- ^7 C$ s
up-car? ;; true if the turtle moves downwards and false if it moves to the right
. J# e; }3 ~% y. c9 k wait-time ;; the amount of time since the last time a turtle has moved. _8 f2 x; c8 Y, p
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6 [/ _: Q9 P9 w O' ipatches-own
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' C' V8 n0 c$ Y/ @7 S7 _ intersection? ;; true if the patch is at the intersection of two roads5 e/ y. y; B6 t: K
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# \# w# L- a! P+ e ;; false for a non-intersection patches.
@0 h' Q8 }' e+ P3 b; A my-row ;; the row of the intersection counting from the upper left corner of the
, A9 y% {5 \1 k. T8 |- V4 [6 x9 B ;; world. -1 for non-intersection patches.& l* J# K E2 i( y& x
my-column ;; the column of the intersection counting from the upper left corner of the" ?6 X& z- Z% y) r9 c& i: n
;; world. -1 for non-intersection patches.
2 u; I9 O3 F7 n: G/ [9 v my-phase ;; the phase for the intersection. -1 for non-intersection patches.% t* g2 c1 g5 @- q8 }" u7 B8 E9 c7 [
auto? ;; whether or not this intersection will switch automatically.
/ B1 Y6 @' _+ V9 H8 E6 U: l ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
- `$ d( u3 O4 i \; X! J L8 X;; Setup Procedures ;;5 v8 U) w2 N. h: G/ ~" y7 o& U( J
;;;;;;;;;;;;;;;;;;;;;;! ?4 ~ v0 u: R/ e: ?
4 r! m5 v2 e1 k6 K- H: G;; Initialize the display by giving the global and patch variables initial values.+ ?2 p! i) m& @4 {( h. b
;; Create num-cars of turtles if there are enough road patches for one turtle to
- D0 _; K5 z( Q6 C+ H+ F;; be created per road patch. Set up the plots.
4 H# c4 X; m, cto setup
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setup-globals
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6 W$ g$ s& f( C6 {, R+ c# S ;; First we ask the patches to draw themselves and set up a few variables9 I' p# W O, @! U+ |6 [8 t
setup-patches
" {) f2 O6 M' u! E8 I& E make-current one-of intersections9 ^' u+ `3 E/ U& x
label-current; M/ ]- N. h8 h6 y! ^0 x! q; i
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set-default-shape turtles "car"/ ^, p4 F/ s6 ?$ V _ b6 k8 }5 C' A* o
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if (num-cars > count roads)& C* |/ H$ j% ]8 t0 @! t: \
[
/ C* H: c7 r# D6 U$ e user-message (word "There are too many cars for the amount of "* b: v# v. K8 N) v* Z
"road. Either increase the amount of roads "' d- J V$ p, c% u- D
"by increasing the GRID-SIZE-X or "
3 G3 P b, h2 o) X7 A' @, A2 p0 O "GRID-SIZE-Y sliders, or decrease the "+ t# Y4 I; J2 A7 y O. _
"number of cars by lowering the NUMBER slider.\n"& v; K; x" ?' @7 O: ~
"The setup has stopped.")) K8 x$ F+ @6 q; F
stop" j4 K; x6 R. O: `- K# p( c7 T
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color A c0 y; e' _! ?/ P1 H
crt num-cars
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setup-cars/ n- u4 q k* p: j$ D
set-car-color
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: W8 Q4 |7 ~, q ;; give the turtles an initial speed$ ~. v v3 i x
ask turtles [ set-car-speed ]# b) l& Q$ W% o2 n4 U! e
! i6 U7 W" x& Q3 ` reset-ticks; M e/ H: F0 L: c
end
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;; Initialize the global variables to appropriate values9 M# L) i' v0 N0 C, u* z$ h. s
to setup-globals; w2 J6 }: ?' x4 Z1 T5 q& B
set current-light nobody ;; just for now, since there are no lights yet! c; B/ f% A3 t. ~& t
set phase 0; Z. a7 _ L' i" \
set num-cars-stopped 0
& H( W7 E6 M; T* z, K! F- l set grid-x-inc world-width / grid-size-x* C3 ~ {! _1 Z5 @
set grid-y-inc world-height / grid-size-y& _ y6 b2 v5 \- \9 Y3 z
. @. _( p+ n+ {' I/ H% | ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( o/ n% i: }% _! I1 U5 t
set acceleration 0.099" L1 u$ R( ^9 i) ^; G
end
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( v% Y+ o; `/ t6 P% q" O, T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
* P, ~- B4 Z+ b;; and initialize the traffic lights to one setting$ W- n& K6 [8 [& O+ {' f
to setup-patches
: |9 b; M/ p6 X0 U0 h ;; initialize the patch-owned variables and color the patches to a base-color; U* _& M6 V& v
ask patches
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/ b' M( s! D6 v2 p. M set intersection? false
& o& g0 g9 ?" U& Q8 B" v set auto? false; W+ ]7 D! V) s! v
set green-light-up? true
+ K% G8 y$ l! |- C4 e1 w1 ?! N6 F+ c set my-row -1
6 F8 Z2 G+ ]/ n6 b! m( K set my-column -1
1 U8 B0 g4 S" s* G$ v set my-phase -1
, m% X1 @: s" Z set pcolor brown + 3
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% `% J4 w8 {& D$ B7 R ;; initialize the global variables that hold patch agentsets, V' h3 j8 z+ |' V
set roads patches with
: t/ Y9 r! E1 c( M1 v1 P2 P [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 Q7 A. Q* e. D+ P( w& g3 O- T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ q2 v' b( N( S, m ]6 }% t set intersections roads with* I/ I" B" F7 Y% Q6 O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 v) @. A& }1 j/ i) k3 T5 P- P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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" [% m4 p. K( R: q. U( r ask roads [ set pcolor white ]7 `, G. J1 {, s; O9 N4 m |
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?1 V5 v" f" X0 H. U0 L: x8 I
set roads patches with
- g4 s7 K- ]. P* W: p& Q0 } [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 f% @& F# b0 I- q$ ~; W0 Q8 E$ Y& a (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# G, E/ k0 F+ B1 k) v# c* F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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