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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。
- s+ B( v8 l& C8 O$ N0 [1 {2 i2 nnetlogo自带的social science--traffic grid这一例子当中,
* ^7 P7 n1 T, X2 s; E1 R4 vglobals
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' i- g) B: n$ p1 [, P* C grid-x-inc ;; the amount of patches in between two roads in the x direction
1 ]- ]& h1 J* r$ t# r grid-y-inc ;; the amount of patches in between two roads in the y direction) E* l, D* V+ T) G. K# U3 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ I' F( T. t% W6 a6 J9 e c- M ;; it is to accelerate or decelerate! T0 P" H/ @5 z' ^
phase ;; keeps track of the phase
4 V" |8 T/ f Y2 w2 e- w num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. d# }5 a2 |$ x/ s$ D5 b
current-light ;; the currently selected light3 a7 k( Q) H2 v8 S2 y' ?/ [1 l Z
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;; patch agentsets- X; y7 ^4 L. T0 f
intersections ;; agentset containing the patches that are intersections. |) W& ]$ w _; o3 _3 n
roads ;; agentset containing the patches that are roads6 ~5 F% F8 I: R g3 ]
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; B6 F& R$ H% c# zturtles-own
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3 }7 J$ }, F8 u1 y1 q! b speed ;; the speed of the turtle
; k7 F" t7 C& m9 Y& \" x# ? up-car? ;; true if the turtle moves downwards and false if it moves to the right' {2 u' u9 y; _/ q' u9 Y! }
wait-time ;; the amount of time since the last time a turtle has moved
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* q: Q. c! b( B$ Vpatches-own2 A8 x9 a6 c; `" p! E* X
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7 f h# K4 U2 G5 z intersection? ;; true if the patch is at the intersection of two roads
# c0 I) J8 R( {5 {: M green-light-up? ;; true if the green light is above the intersection. otherwise, false." K( L& M" P- \7 q
;; false for a non-intersection patches.
* v, t4 F5 J/ f! r( {; { my-row ;; the row of the intersection counting from the upper left corner of the
( w3 P% D7 b: k& r( G ;; world. -1 for non-intersection patches.
8 d3 V1 w( Y) P2 ` my-column ;; the column of the intersection counting from the upper left corner of the
- d9 M7 |+ y! V8 n" p, E ;; world. -1 for non-intersection patches.% k3 M) l( a* Z
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
]1 N/ b. s( F% {) o2 h! s# v auto? ;; whether or not this intersection will switch automatically.) o( ]& z Z6 N+ J) Z1 z! F' q' P
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 d5 N. x$ M: q: t+ j5 H- O
;; Setup Procedures ;;5 V$ n* q d0 @9 H& H
;;;;;;;;;;;;;;;;;;;;;;. K% P1 }6 |3 n# ^ @4 r0 ]
+ Y4 u; D* f- P5 x0 Y& w" v+ O) C;; Initialize the display by giving the global and patch variables initial values.
Q( m- D; J6 b+ I;; Create num-cars of turtles if there are enough road patches for one turtle to* g/ C1 u' M6 @1 M3 b s
;; be created per road patch. Set up the plots.
8 `( A4 l$ E6 O2 H8 Ato setup
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setup-globals( U3 b) R1 b& i& @
" N" o- W( T0 Z Q; `* X9 B ;; First we ask the patches to draw themselves and set up a few variables
% A+ I1 M5 o; u4 d H0 V setup-patches
' L6 c' ^- U; A6 |" Z, P' `' F make-current one-of intersections
6 p: w; J$ N# X3 }2 f label-current1 C8 e( a( L' Q$ U" h0 X
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set-default-shape turtles "car"
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& A7 d% o6 c- W$ [, c if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
# ~' C. f! e$ H9 [ "road. Either increase the amount of roads "* o/ w4 O" s: f9 \) {
"by increasing the GRID-SIZE-X or "
1 N3 }, z0 F) P' g7 N "GRID-SIZE-Y sliders, or decrease the "! X0 a) X% M0 q/ v
"number of cars by lowering the NUMBER slider.\n"
# F2 h$ m) ]" Z# m "The setup has stopped.")
- g" p; c; b1 Q stop
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0 e+ O+ c, x6 v& Z- R- C2 x/ P ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! W/ J# b' }: `, W crt num-cars/ l; f2 ~; i; i" F% J: e, n
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setup-cars
# U, g0 t, X/ N. ^. U set-car-color
3 W5 x" _. ^: {* E) F' U record-data6 Q" |/ j: u2 a
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;; give the turtles an initial speed. a4 I( D$ w6 I/ h
ask turtles [ set-car-speed ]
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reset-ticks5 m; I& J7 c9 \0 _4 H Y+ T
end
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; S3 ]- |$ N; I/ N/ u! y9 Y5 G;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
- Z" o: ^, @. p0 j4 d {8 d set phase 0
! a/ U. e6 R) l! Z set num-cars-stopped 02 e. i$ n; ~6 x/ v# k' Q9 f* e
set grid-x-inc world-width / grid-size-x% ?; z, G0 m- g. ]% @# c* s+ ?( S
set grid-y-inc world-height / grid-size-y0 A8 [# p) I* K
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 D- U* X; J9 a3 P
set acceleration 0.099
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5 T; Z+ d) f$ b/ \( x, o$ ~# t/ P;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# _+ L; A7 H" ^- m* y8 e, Y
;; and initialize the traffic lights to one setting
: b' z7 C5 s. s% c. o$ y# M0 lto setup-patches
" k' F* Q7 k3 g0 y6 A7 |% G1 y ;; initialize the patch-owned variables and color the patches to a base-color3 p$ w, C5 |% }) X/ ]- `& Z# r
ask patches
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set intersection? false
+ d1 \/ g( l! X K9 _ set auto? false
4 j; r/ _) K7 Q9 i$ a( E set green-light-up? true% v0 X! T% d& p3 v
set my-row -1
( z4 A5 g: U5 H& n/ P set my-column -1
& u' @- h" F3 j0 ^ set my-phase -1- L- x6 b ~$ ~0 ?( c$ H5 w
set pcolor brown + 33 q0 p7 P! ^; c) w+ V
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;; initialize the global variables that hold patch agentsets5 G! P7 Z! I* v U: h
set roads patches with
$ G/ p6 y8 y1 F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; b0 f" b% X% W, S (floor((pycor + max-pycor) mod grid-y-inc) = 0)] P# d2 v% J6 @. O& M" o; S; ^
set intersections roads with. O" B1 }# V1 t1 C. ?
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 ?3 q5 T( D9 Q( @' Q, U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! O6 W n* Y& ], D! a0 o
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ask roads [ set pcolor white ]4 Y0 X- v7 b6 C# ]3 l/ @( |) _
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?# e0 B& T& o( ^9 P
set roads patches with8 v% I+ J% l M0 S, V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( Q1 Z1 T2 D# ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 O- ?- u+ W0 H) s* k5 T! a
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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