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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 T4 U3 q0 O1 p7 F7 V# L" f( Tnetlogo自带的social science--traffic grid这一例子当中,: W2 K. K6 X* r
globals
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* B8 {) t, p) H+ X) a4 p6 B+ X grid-x-inc ;; the amount of patches in between two roads in the x direction# j9 b f0 X5 Y3 c/ L% v$ [
grid-y-inc ;; the amount of patches in between two roads in the y direction
9 l, _2 H0 G. k) h* Y acceleration ;; the constant that controls how much a car speeds up or slows down by if- Y4 q6 a. Q9 _' t
;; it is to accelerate or decelerate: P% q; V- ~8 ^3 w
phase ;; keeps track of the phase0 \8 n! b# y9 ^
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 N) h# ^( _/ q& w
current-light ;; the currently selected light3 }/ }5 S2 O& I$ g
2 F5 F2 O% E2 d, Q1 Y5 Q ;; patch agentsets8 }1 k/ X$ O6 z
intersections ;; agentset containing the patches that are intersections
) W! M' T9 P- B, H' G0 \+ h roads ;; agentset containing the patches that are roads
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0 A" v' T/ L9 ^- tturtles-own
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speed ;; the speed of the turtle
; o2 A) k+ T' d/ K+ L up-car? ;; true if the turtle moves downwards and false if it moves to the right" _( ~! `4 M- N/ P3 O) Y
wait-time ;; the amount of time since the last time a turtle has moved& j! k/ l, F: t/ g# t$ G
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5 m0 ]/ \ ?" q5 @1 Opatches-own" g" o5 V9 ^, U
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intersection? ;; true if the patch is at the intersection of two roads
+ Y7 J9 O8 a$ {5 _ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ ]0 L) p& y( C: @$ `! t/ l0 u ;; false for a non-intersection patches.
7 K3 Z1 Y' f/ Q* z, D my-row ;; the row of the intersection counting from the upper left corner of the5 M6 \% z! g9 u2 `7 o
;; world. -1 for non-intersection patches.
1 w( U5 B5 ^/ p1 B my-column ;; the column of the intersection counting from the upper left corner of the4 t: V! @( Q) [0 E7 y5 q2 E3 B
;; world. -1 for non-intersection patches.
+ ?1 T& } ^4 ^: g; M- F6 { my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 `+ e+ c) m9 W3 A auto? ;; whether or not this intersection will switch automatically.
. Z( m1 c s; m" e" Q" ~ ;; false for non-intersection patches.
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6 g6 ^+ t' a1 y7 y4 U;;;;;;;;;;;;;;;;;;;;;;3 h: \" T" B6 }9 H
;; Setup Procedures ;;6 o, N) F0 b4 ~
;;;;;;;;;;;;;;;;;;;;;;: r4 z b2 V- r
* e/ T' L+ k" {, Y) p8 r4 o; j' Y;; Initialize the display by giving the global and patch variables initial values." Y/ U8 }3 G: g# c: w
;; Create num-cars of turtles if there are enough road patches for one turtle to k0 \% S/ G& O) j% U
;; be created per road patch. Set up the plots.
9 e5 Y& t7 A! j5 x) `: `8 Kto setup9 o" _7 c& \! V& Z( e, `8 w
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setup-globals2 u9 ]- @ Q0 \* z" n
1 g/ m7 N8 v4 t" @( A ;; First we ask the patches to draw themselves and set up a few variables
]$ o, ~5 i# u7 F0 Q) P7 @ setup-patches
# @* c! b4 c, ~. a; V make-current one-of intersections& f: {: F2 V3 ^, M, [
label-current
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# l3 k& u1 P" o2 h3 q, s set-default-shape turtles "car"; C6 \* ?7 ^# w# g2 L$ t. e
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if (num-cars > count roads)) Z8 M2 f' x" J
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user-message (word "There are too many cars for the amount of "# q" n1 o, [% I1 E- ~
"road. Either increase the amount of roads "
! F1 z# F3 q& A: M, z. ]: E' j8 _: \ "by increasing the GRID-SIZE-X or "8 |: A1 R8 E4 {0 D4 C6 l k6 A
"GRID-SIZE-Y sliders, or decrease the "
) _* M( f! D& v "number of cars by lowering the NUMBER slider.\n"3 b' t e4 A' `8 Y: ?8 s* \
"The setup has stopped.")( N7 V$ D0 J% @, S6 G0 y
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, {" V4 o5 l. @& Q3 ? o" | crt num-cars6 L9 Q1 n" U4 q4 @+ T8 o* W' A
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' [3 h3 a/ i" o4 o+ |( P- i setup-cars
& K; y! h& _: I1 R/ }- F4 I& | set-car-color
1 }7 [* b" e z: X! ?$ P( y0 N* p record-data2 D; J7 `* O, l
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;; give the turtles an initial speed
% X7 E7 g" z8 b, D" l! c! } ask turtles [ set-car-speed ]
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7 |, w& n. n1 T2 f# { reset-ticks
; A$ D( d( c$ Z; a. b: o) L+ Tend
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
( I } g$ Z. @: U. `* L set phase 0
1 v2 a& `8 c+ S3 C: L* X1 C set num-cars-stopped 04 y, j5 _5 N$ q1 e1 w, X! ?9 j6 d
set grid-x-inc world-width / grid-size-x- M! p; c2 n; L" w# w
set grid-y-inc world-height / grid-size-y: ~# n$ z7 [. y( I, X0 X
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( p* j+ t1 _) B4 z. W0 n u set acceleration 0.099
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: A$ R; P4 A" }3 M$ f;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 S, F) ^1 K h$ p }1 O9 d;; and initialize the traffic lights to one setting
8 O% u/ l0 K8 \' P0 _2 Wto setup-patches
' K$ j* c! s! {7 C) H0 r/ e7 |2 } ;; initialize the patch-owned variables and color the patches to a base-color
. R. p+ i4 k( a! Q& \ t& c' v ask patches. U o4 a( Q5 t/ O& z/ \4 e$ b
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set intersection? false( e4 [* _' s; I( h! u
set auto? false0 u" e# U% s6 R& M! l# c2 F) Z6 S) g
set green-light-up? true
! u$ n3 R/ p0 a$ i set my-row -1* {3 K2 g. ]4 u% ^% d% x
set my-column -1
: o) f% ?1 T& V: T& W; L- ?- E9 c set my-phase -1 x7 n: s+ _; ~, ^& Y. W, X8 Z
set pcolor brown + 38 z/ E5 O; k1 L9 i: B6 b! v* r
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. P& \) M. Q) a! \4 P( n ;; initialize the global variables that hold patch agentsets
0 |8 q% P8 ~) d set roads patches with! |: z2 G6 p/ Z+ t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. @; I' H. _( K- ?# C* {4 y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; d j, y" c( U5 O+ i" @
set intersections roads with
6 d- A2 x a; J4 j# _0 q/ g! x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' H$ D+ h) K! }+ \$ ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; k) F& Z. I( ^
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ask roads [ set pcolor white ]! k R: i% A: Y; t0 S v' j
setup-intersections& C+ W' _3 a' }/ B7 |& f
end! j) M- l# h8 q' _: E( ^9 e
其中定义道路的句子,如下所示,是什么意思啊?0 r0 ?8 T: L0 t4 d! ^/ l. S
set roads patches with1 B/ i8 F5 I9 e* `- K: y3 |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or X3 O: f4 H, K: Q3 N' b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- u& |: a5 a( ], P7 I
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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