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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。
, f% K5 N) Z: H" ]+ unetlogo自带的social science--traffic grid这一例子当中,
+ A% W4 ^) U6 oglobals
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/ b! [; @6 _/ R( k! Z2 o( M* o grid-x-inc ;; the amount of patches in between two roads in the x direction
. A% F1 K+ h# W grid-y-inc ;; the amount of patches in between two roads in the y direction
9 L" ~8 n5 ~ Q+ @ acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 R1 F" G* J% s. Q- M2 q* M* {5 N ;; it is to accelerate or decelerate
3 @0 L- L* _$ |6 j phase ;; keeps track of the phase
/ m/ v: n! |6 N8 ~ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ t- {7 b, T. ` current-light ;; the currently selected light8 I3 c: A! O4 E. ]( C3 s
: s! Y4 R% f- p: g! V: ] ;; patch agentsets9 k. D3 J( c4 O, m4 @5 ?6 J
intersections ;; agentset containing the patches that are intersections2 M9 G+ \# l6 x6 x' s( G
roads ;; agentset containing the patches that are roads
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- ~6 ^0 T# j$ ^6 w" @turtles-own6 B3 N& s+ x0 B8 }2 k0 X
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speed ;; the speed of the turtle( G! G& j" _% f
up-car? ;; true if the turtle moves downwards and false if it moves to the right( r6 L+ X+ }0 Y; T' K1 V
wait-time ;; the amount of time since the last time a turtle has moved& `8 W5 z* z* y7 d' s, T; d
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- j, s+ l" M7 }, {6 m" D1 V4 k# Cpatches-own+ A/ r9 Q+ a( O- j) W7 V( G& p
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Y! D& T$ W4 O0 E7 T intersection? ;; true if the patch is at the intersection of two roads
$ a d j3 F0 U$ [ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 G) P6 j/ m& G* r' ^ ;; false for a non-intersection patches.3 j p1 }+ g+ O- N$ ^0 h
my-row ;; the row of the intersection counting from the upper left corner of the9 v. v* v$ ^. \
;; world. -1 for non-intersection patches.& o, m- T) B8 J! G7 e3 i
my-column ;; the column of the intersection counting from the upper left corner of the
4 Q0 U' F/ L4 d' Q ;; world. -1 for non-intersection patches.1 w& d% v$ H. o- ^; }9 g
my-phase ;; the phase for the intersection. -1 for non-intersection patches., o6 z/ P! A- S+ w7 p
auto? ;; whether or not this intersection will switch automatically.; }" j$ x) e+ C# N8 \" V/ O) W
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
* h+ O5 @2 |1 l: ?;; Setup Procedures ;;
5 f i- L6 a1 e$ N;;;;;;;;;;;;;;;;;;;;;;0 \+ c; X7 ?# I. f8 Z
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;; Initialize the display by giving the global and patch variables initial values.
% O0 k3 I. o, w3 W" R- Y# B" c;; Create num-cars of turtles if there are enough road patches for one turtle to
" _9 T- y9 D2 k* O7 e;; be created per road patch. Set up the plots.. d2 L) H# l; Z. S% T
to setup
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9 `' k. R" M8 z" ^) g) R setup-globals" Q6 @. y s4 q a1 A- E3 H ]8 P; D
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;; First we ask the patches to draw themselves and set up a few variables
0 e9 s1 O: s+ @% n setup-patches
: E" L" y/ _% @5 Z" [: } make-current one-of intersections% P+ N$ A, K! e7 J
label-current
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. @. F1 u* R. f9 d. Z( m) M u3 r set-default-shape turtles "car"
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" D7 ~0 l7 y0 x# D9 D N6 N* `6 y if (num-cars > count roads)! x8 b. g3 }, a* z, e8 `5 y& w
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user-message (word "There are too many cars for the amount of "5 c. l$ Z( f- Q" V" x0 ]
"road. Either increase the amount of roads "1 q" f, o! n2 r4 t$ F
"by increasing the GRID-SIZE-X or "
% r6 L; o5 Q) E+ v5 S "GRID-SIZE-Y sliders, or decrease the "
; D9 n* C9 g" V& y( `0 O8 I "number of cars by lowering the NUMBER slider.\n"1 w% p% D5 w9 g* u
"The setup has stopped.")
) S( z _6 p. l, ] stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: p" V' O: |( G# X8 G
crt num-cars0 ~. J# i$ r) L
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setup-cars. f& Q6 \- k: r, U# x
set-car-color
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;; give the turtles an initial speed
% W, z$ K0 |$ x' x& a5 h ask turtles [ set-car-speed ]1 s& t( f5 l/ ~
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reset-ticks# z6 b9 I6 `! M& \; i1 S' w6 @
end
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;; Initialize the global variables to appropriate values8 S9 J/ q6 G: U. H
to setup-globals9 X. u3 Z. l2 |7 X# Q8 }% W: }
set current-light nobody ;; just for now, since there are no lights yet
! v) f, a9 f. {) w8 V& p, x set phase 01 t7 i! s: R) }' I
set num-cars-stopped 0
& c4 G/ }4 c0 C" K1 v set grid-x-inc world-width / grid-size-x
- [$ ^& C' Z- i set grid-y-inc world-height / grid-size-y' B' \5 ~: j* o9 ^" h
( y& A, h N% c( N3 a* R j( [ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" Y' {. n9 s/ D' f" |4 M
set acceleration 0.099 X; \, q. |2 X4 O' A
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 \+ H7 M( O5 d, r8 P;; and initialize the traffic lights to one setting2 p4 p" _! |8 U' t- x
to setup-patches% w m5 Y8 r" a: h5 V2 U
;; initialize the patch-owned variables and color the patches to a base-color- u7 q% D9 [+ p ^* t2 u
ask patches, X- r/ g' W) J; d& p6 ~* t
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" r L$ ?. R2 f* g) y) e set intersection? false
# q: C; N: A( i set auto? false" f2 \9 A( |8 N% q. ~9 _$ i
set green-light-up? true+ w+ E$ X, M1 Q. v
set my-row -1" B4 I! e5 j8 w+ n8 c! k
set my-column -1
( D7 ^% m! A8 ~ ` l; t) G( ? set my-phase -1& H$ f. Z# z% v/ r
set pcolor brown + 38 g( a2 X* w6 X j7 {' V7 _8 j
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;; initialize the global variables that hold patch agentsets3 a9 o4 [# ~9 `. e
set roads patches with
, c1 z, C; H2 g S& }7 | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 s( {# Y0 D, r$ M0 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 d: A4 F2 h( y/ q/ o: Y set intersections roads with
3 p) B+ _9 U' K- {5 T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( H1 W, n: R$ [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]( i5 @+ n+ J1 {/ j, Q. i u
setup-intersections
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7 |0 {+ I. B# z: F" K- H5 \其中定义道路的句子,如下所示,是什么意思啊?
! p- q9 e3 C) X9 P9 J set roads patches with
, @; Z0 Q ~5 L6 j. k5 _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( U* A5 I5 x" }+ f5 D (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 a3 s, ?, _- Z, U- f! @$ a4 o& M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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