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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。
- \" h1 i" A8 inetlogo自带的social science--traffic grid这一例子当中,
6 Z6 S9 N# J' `: ^globals
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; ~; S4 |" z4 H$ I1 T grid-x-inc ;; the amount of patches in between two roads in the x direction
$ x: c" f2 a- ~2 \3 E4 ]8 o | _ grid-y-inc ;; the amount of patches in between two roads in the y direction. [6 v, ~" H2 i5 @
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 N: I% R- H0 P& U d ;; it is to accelerate or decelerate7 I1 F9 ^) n* c" k6 c: V
phase ;; keeps track of the phase8 w& ] l Z8 g( b9 e
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ y3 i f$ g2 ?1 o1 \
current-light ;; the currently selected light
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7 ]( Y: e& F% R: | ;; patch agentsets
. ]) _, K# F, K intersections ;; agentset containing the patches that are intersections- h# y$ n' L: H& K4 i. \- R( }; |
roads ;; agentset containing the patches that are roads
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turtles-own
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& c/ w* f. A5 \/ F O0 ^ E0 | speed ;; the speed of the turtle& ]6 _5 R; A: A: T. M: |; y) @. ~
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* ~) E3 B2 y' k/ L( R3 A wait-time ;; the amount of time since the last time a turtle has moved" ^) n7 [* o' h$ ^
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. f2 {) R: Z& Z5 Q* z2 E3 mpatches-own, r+ M: i( k# e+ P
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intersection? ;; true if the patch is at the intersection of two roads
! P3 _1 O( ^" }$ h green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% ^7 t8 v1 \) T/ i; G* u/ t ;; false for a non-intersection patches.
; }9 v- s+ e4 q6 D u4 N my-row ;; the row of the intersection counting from the upper left corner of the
; ]2 y } M& T$ e7 `/ k ;; world. -1 for non-intersection patches.5 G- n" H* k( U5 U2 D
my-column ;; the column of the intersection counting from the upper left corner of the2 R; f" S6 `) ?0 o6 l# g
;; world. -1 for non-intersection patches.
U4 \1 ]; }% n3 H my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ Z @1 G+ r2 i$ Q" [+ O& K7 N auto? ;; whether or not this intersection will switch automatically.
: N$ j* V A8 J, M$ }) B, x ;; false for non-intersection patches.. h4 S5 M! N6 f/ K; Y: o% V# R
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;;;;;;;;;;;;;;;;;;;;;;
' v$ S% E# P6 W; ?# h& }9 \;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
9 I9 Y; U: ^4 b;; Create num-cars of turtles if there are enough road patches for one turtle to0 ~; X; |3 {5 I0 P2 \
;; be created per road patch. Set up the plots.
4 a" B& |# k3 r( [6 vto setup, T1 n7 E; M" V
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setup-globals; T: j6 p0 S' M( L
! i, m2 C* R2 [2 Y# F% k ;; First we ask the patches to draw themselves and set up a few variables# A+ }( e- v! X% N2 H' q6 k' f
setup-patches7 `& P6 l: r3 a( V% w. t
make-current one-of intersections" m( L6 a% Z/ m& |
label-current6 ?* U+ e9 [+ k! X5 B
\' P( m7 j- |; {6 J/ r6 E+ E set-default-shape turtles "car"- X4 H0 Q9 J# w6 [7 z2 k& ~
5 t! r1 {# _1 Y7 ^2 A4 t- m$ f if (num-cars > count roads)6 Z0 e9 m' Z# L# J3 m4 ]) w
[
9 r; Z y j0 O2 b0 y8 U) | user-message (word "There are too many cars for the amount of "/ A, f3 Y$ i+ q6 n
"road. Either increase the amount of roads "
2 N% }5 k. O! U+ V; M2 d: n "by increasing the GRID-SIZE-X or "
9 I1 d# d( |( F K6 Y9 g "GRID-SIZE-Y sliders, or decrease the ") ^' H- T2 ?5 A9 m1 H4 i& x( S
"number of cars by lowering the NUMBER slider.\n"; N1 t$ W @( Q- w2 I$ R
"The setup has stopped.")
2 t2 h5 B% g" i. o$ _* z" Q stop
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" m# M& k) h& @1 @0 d ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& C, b% X+ n- V0 i' o1 r crt num-cars
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& g% c2 O# M5 k# L! a, Q+ S- t setup-cars9 G: T1 ^# _3 U& m8 {" ]
set-car-color
( i0 q H3 @( y" U1 ~ record-data
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- {0 i: l! P8 m( [) R: e7 g' ^$ k- ] ;; give the turtles an initial speed0 \1 [2 I; j7 O* c1 D' s
ask turtles [ set-car-speed ]
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& k6 r( M7 t7 L reset-ticks. M! @, D# G+ H8 {! H( J
end
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6 R1 n7 h; z% f. Q- b- }3 l;; Initialize the global variables to appropriate values; t5 F: ^" v; l$ y
to setup-globals4 m9 X! ~! k# w2 w" ^7 R+ ]
set current-light nobody ;; just for now, since there are no lights yet
`4 }) F J9 t8 x& x set phase 0# M! i* i4 L1 i0 H9 |
set num-cars-stopped 0
9 w' _. j8 ^& }4 a% _$ N; q set grid-x-inc world-width / grid-size-x
: l; U# `+ t9 f set grid-y-inc world-height / grid-size-y
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7 x3 [% {+ k6 k0 `; ~; d# G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) u* t2 i9 ~, S, [* j' P set acceleration 0.099
9 h i# A; F) S7 {( K$ X, r3 Iend
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. P% Z0 A+ V, i Z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ {. k4 u& `( s;; and initialize the traffic lights to one setting
+ l$ D) q2 u! l* P2 c: xto setup-patches2 ^7 T1 b9 E9 U K. W) p/ J; q
;; initialize the patch-owned variables and color the patches to a base-color
% H0 w$ ?7 d# v A( W ask patches' u: b% q8 n8 C* n6 \. O
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set intersection? false1 @2 z6 A D" ?7 }0 r1 G0 D
set auto? false
* y# t& v8 L5 F set green-light-up? true- g) l. T4 R# ?7 ~ J4 O
set my-row -1
$ M1 P0 w5 k$ I/ I. T set my-column -1% J- W0 I" o% R. q8 H# F
set my-phase -1
* a% @% N k7 o2 k; E3 L set pcolor brown + 34 T) i3 @; E ^. {
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;; initialize the global variables that hold patch agentsets
8 z4 ` J' Y9 v/ W# S' U set roads patches with
% f7 u! P! ~4 S3 Y" D0 \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 x/ x' W! ^5 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) E, Y* g) _7 s: ~- \8 s& U# n1 {% ^ set intersections roads with, M: f3 B; K* z, | j$ C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. z9 R' A; \& x6 v. E7 c, T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' n1 ]4 ]+ ~# w1 L7 L5 u, W* }
setup-intersections9 [( X' ]1 C- B( f+ ?9 l4 d
end$ g9 z/ V5 K# W& _& r Y1 x7 R1 D
其中定义道路的句子,如下所示,是什么意思啊?5 o) H4 i, I6 V1 X M4 \0 }% ~
set roads patches with
9 @! j! w! n! v0 I" o) k [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- e# W4 \2 t2 y9 V* N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) J! z# N+ W- O g1 J
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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