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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。
) z" @1 d8 o" _0 T! X* H; t% Cnetlogo自带的social science--traffic grid这一例子当中,- M% P h% B/ u# w7 P r9 s7 _4 H" w
globals. z0 O. n) Q5 [0 _8 _7 e3 J) H
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; p& D* ~. Z8 | |/ v+ ^/ @& w grid-x-inc ;; the amount of patches in between two roads in the x direction
& O9 i$ Q: }/ Y6 T& r/ V grid-y-inc ;; the amount of patches in between two roads in the y direction4 d3 S9 @! x, x8 d% A5 R/ U% g
acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ E* D' t+ R; L. C1 _5 B ;; it is to accelerate or decelerate
A) r- c- ^/ s4 U- I phase ;; keeps track of the phase
- G& q# W1 @# H$ G5 y$ q. j num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure5 \- R' k$ [- d: p: V, S
current-light ;; the currently selected light
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;; patch agentsets, \* f/ }' O/ _9 U4 x) f# [3 F
intersections ;; agentset containing the patches that are intersections k; A0 h4 ~4 A! J" ]( g
roads ;; agentset containing the patches that are roads1 c) u* A8 l8 Y) T( G
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turtles-own
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+ I2 `; g3 U7 s speed ;; the speed of the turtle8 F' a, }' J- }; R
up-car? ;; true if the turtle moves downwards and false if it moves to the right
- v$ k* }- ?; S& M" k' p* ^( R# a! A/ P wait-time ;; the amount of time since the last time a turtle has moved
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" c: v. l2 J+ X8 M6 `patches-own
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8 ^6 T9 Q( g5 K- d9 i$ V3 T intersection? ;; true if the patch is at the intersection of two roads
, p( q8 U- `9 X$ l* t+ Y1 z" G- | green-light-up? ;; true if the green light is above the intersection. otherwise, false., m( n0 o4 r/ _) l2 a. N
;; false for a non-intersection patches.
* |" l& A0 N- {2 L my-row ;; the row of the intersection counting from the upper left corner of the) ^9 n% y% a3 {( N+ q4 I% g
;; world. -1 for non-intersection patches.
& s0 E/ y, Y) W( }6 _/ e2 ~ my-column ;; the column of the intersection counting from the upper left corner of the# \6 l0 j* j0 o; |9 H& w
;; world. -1 for non-intersection patches.
$ {" L- \, F* e% L my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 K- o0 t8 I3 \# O
auto? ;; whether or not this intersection will switch automatically.$ e- @- m* x e# }
;; false for non-intersection patches.
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w2 J5 {7 p5 S) d& ~;;;;;;;;;;;;;;;;;;;;;;
' }4 F" B: U, z r;; Setup Procedures ;;( X9 i! n0 l$ E( j" j5 G
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;; Initialize the display by giving the global and patch variables initial values.: ?5 p' m9 R$ i; M0 X3 r9 {& d
;; Create num-cars of turtles if there are enough road patches for one turtle to3 P/ b) u3 d6 x, ?
;; be created per road patch. Set up the plots.
2 i C1 i* t; t% i6 {$ sto setup
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8 ^' q) W8 F7 w+ @) Z setup-globals' ?1 d& ]5 l. q& m/ p
- R/ b# [" e) \8 p ;; First we ask the patches to draw themselves and set up a few variables1 ]& K# I! J; M6 C7 @" O1 z* s/ _! S
setup-patches6 d$ y- H) c7 Q! x2 {8 @( p& j
make-current one-of intersections1 L( j9 \ O3 k! c5 }; F' H
label-current/ V$ _& i0 x0 S2 I6 ^
+ h' M6 ?( U# q6 F set-default-shape turtles "car", ?( N4 T9 s3 S v; G9 _
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if (num-cars > count roads)
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8 C& M7 p) I2 X( o/ S3 i user-message (word "There are too many cars for the amount of "+ n2 L E2 b+ _$ S' w: a
"road. Either increase the amount of roads "* G% y1 C; }3 h9 v6 l
"by increasing the GRID-SIZE-X or ": c5 E" ~$ o6 t
"GRID-SIZE-Y sliders, or decrease the "
6 i# f! \& _+ y9 \; r2 e* C "number of cars by lowering the NUMBER slider.\n"
7 Y1 ]/ L5 t4 J9 Y4 z p; e "The setup has stopped."). ]5 M, g3 B+ B" }: m* m# i$ O+ a$ C
stop
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6 i, P: w( o1 N% s& K, f ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ R% \ Y( A1 }
crt num-cars' R( |9 C0 k( M& ?# @ ^
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& I* N5 Z3 x) E m0 K; Y setup-cars
! J& |: i" s9 D' l& O set-car-color! `' @3 R5 _& G7 E5 l8 r
record-data
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;; give the turtles an initial speed
# o( e3 c# l. @& m' x4 B. [5 T ask turtles [ set-car-speed ]) V4 i5 t V" U
- Y: E ~' M/ q( S reset-ticks& ~1 q+ D2 A; S- \
end) }3 X- c- h# U1 Z
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;; Initialize the global variables to appropriate values& d# ], S# b0 \' _6 W! C
to setup-globals* }, _5 P1 m' }
set current-light nobody ;; just for now, since there are no lights yet5 o q# a" e) `
set phase 01 q [" h; f7 ?7 U8 f9 u7 ^
set num-cars-stopped 0. L% P' W5 p) D( w5 d, q
set grid-x-inc world-width / grid-size-x
9 }; ?% q: ~) g* d) r set grid-y-inc world-height / grid-size-y( r0 S' @' N- I+ k3 i# O
# t; g' X0 S: X1 }/ M, i3 y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' f" R5 G0 J9 A$ ?2 T set acceleration 0.099
: x( J6 @3 q. _# m$ Dend
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u8 U+ i5 ~' o: u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. g3 W3 C/ h4 L2 @;; and initialize the traffic lights to one setting
" u9 u5 j& s# V: P. bto setup-patches! A0 D6 y+ |6 ^7 O
;; initialize the patch-owned variables and color the patches to a base-color
, @' l5 B) r$ l, |2 s, ]5 f ask patches
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set intersection? false
, S6 Y5 l- T5 g, r! q* q set auto? false' C8 P, j! ~2 o/ j: m6 y! }2 `1 c6 T
set green-light-up? true
9 X; v$ s, T3 B, Z# i7 G set my-row -1
5 |# Y8 b- S7 _# ` set my-column -1
6 P7 Q7 J" `0 Q9 L* L5 R+ J set my-phase -1( R# Y7 m! y) C( D. ]1 }( u
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets, \+ S9 m8 j# U' f& b$ L, z
set roads patches with+ ?! f3 N& ~! ?( }9 I! z4 |& x/ A( T. w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 K' p: v& X, \# I" q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% _; `$ K- \$ ?, l5 R3 B set intersections roads with
7 g9 o b: r+ F9 Y/ M+ c0 i/ e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ T9 T& Z* ^8 j* G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]; j; f5 |( m p7 m' w2 ], b
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? w9 e; t: Z, D: Z6 |
set roads patches with1 v% a7 M4 X; S; X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 \% R- m: ?0 W" O* p8 [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 j/ J% q8 K5 L' q. m& ]* E
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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